R134a Enthalpy Chart

If your cabin is a little warmer than you'd like, it is likely time for a recharge. NOTE! Refrigerant and oil capacity guides are based on data provided by sources such as AllData and Mitchell. From the ratio of the net capacity and the drive power the coef-ficient of performance COP can be calculated. ? 2 The generalized compressibility chart Data from the tables. If you enter the vent it can be cooler. Throughout this explanation the refrigerant R-134a is used as an example. Performance of the system is exactly as shown in the repair manual in the GTS section with R-134a. at no losses. Overall Heat Transfer Coefficient Table Chart: The heat transfer coefficient is the proportionality coefficient between the heat flux and the thermodynamic driving force for the flow of heat (i. The BioCompact 210/210 combination, is a stacked cabinet consisting of two BioCompact 210 cabinets mounted together. In this region there are vertical temperature lines, which t134a as enthalpy is increased. Below is a list of Sanden compressor types and the refrigerant oil that was factory installed in each type. Another thing to note is that Vintage Air states that the low pressure side should read 6-18 psi. The pressure-enthalpy diagram (log P/h diagram) is a very useful tool for refrigerant technicians. Whether R134a performs as well as R12 in any given a/c system depends upon system components and the. Analysis (a) The final pressure is equal to the initial pressure, which is determined from ⎟⎟=90. PRESSURE TEMP CHART in equilibrium with the liquid is at the same composition during phase and complete the Assistance with Obtaining a Replacement card form (PDF, 1pp. Keywords: GWP, ODP, COP, alternative refrigerants, window air conditioner. The above figure shows the objectives of refrigerators and heat pumps. This product is for use in retrofitted and/or factory installed R134a auto air conditioning units. The piston that is free to move has a mass of 12 kg and a diameter of 25 cm. R-134a is a substance with very low toxicity. Everything that occurs in the saturation zone is a latent (change […]. This compressor can be used to replace old Whirlpool Model# EGZS80HLP Thanks for looking and good luck!. Below 1 ATM. If you're behind a web filter, please make sure that the domains *. R134a Property Diagrams: Pressure-Enthalpy Diagram; Enthalpy-Entropy Diagram. Pressure Enthalpy Diagram R134a Excel Posted on March 25, 2019 by admin Pressure enthalpy diagram for a butane based subcritical rankine cycle with and without regeneration tutorial pressure enthalpy diagrams ms excel spreadsheet add in for thermodynamic properties and process simulation of r152a diagramme de mollier excel frais. Refrigerant 410a is the leading HFC refrigerant for replacing R-22 in positive displacement residential and light commercial air-conditioning and heat pump systems. The unit is a 400 ton, R-134a, four-stage compressor, with a two-stage flash gas economizer. 24 atm with a velocity of 90 m/s. 5 Btu/minute of added enthalpy, or about a 4% cost to the system over the cooling capacity. CYCLE_D (NIST) software. The A/C cycle begins again asthe R134a vapor is compressed anddischarged under pressure. R134A : Introduction 1,1,1,2-tetrafluoroethane, R-134a, Forane 134a, Genetron 134a, Florasol 134a, Suva 134a or HFC-134a, also known as norflurane (INN), is a haloalkane refrigerant with thermodynamic properties similar to R-12 (dichlorodifluoromethane) but with insignificant ozone depletion potential. Generalized Compressibility Chart RT p Z v In this chart, the compressibility factor, Z, is plotted versus the reduced pressure, p R, and reduced temperature T R, where p R = p/p c T R = T/T c (Eq. The chart shows the pressure, temperature and enthalpy at the current mouse position. du Pont de Nemours & Co. The index LCL0 inhalation in rats during 4 hours is less than 500,000 ppm and NOEL in relation to heart problems is about 75,000 ppm. As an example for a beer cooler: The desired box temperature is 36 ° F; the system is R-134A refrigerant. Taking reading and seeing enthalpy values from the data handbook with having refrigerant R134a PH chart Evaporator enthalpy H 1 :585KJ/Kg K Compressor enthalpy H 2 :615KJ/Kg K. 5 Outside heat-transfer coefficient / R-134a rated value Heat flow ratio / Testing machine rated value R134a R1233zd(E) Fig. mollier_chart_for_thermal_engineering_mimeclubore. [15] R-408A is a zeotropic HCFC blend of R-22 , R-125 , and R-143a. The photo shows both sides of the tool. find the mass flow rate for domestic refrigerator: first of all u find temperatures and pressures given below: temperatures and pressure: (1) compressor suction temperature and pressure (2) compressor discharge temperature and pressure (3) condens. Evaporative cooling: Example 10 Referring to Figure 21, air at state point 1 (65°C dry bulb temperature and 57°C wet bulb temperature) experiences a temperature drop of 3°C as it passes. I googled it already for more than 5 hours but can not find what i'm looking for, all i can find are app's or add-in's that doesn't work. 0) Global Warming Potential (CO 2 = 1. The answer is given below. P-h charts for all common working fluids (refrigerants) are available. SI UnitsPressure, Temperature, Pressure, Temperature, Pressure, Temperature. Forane 134a Pressure Temperature Chart Author: Arkema Inc. Add an R134a compatible drier/accumulator. 5 Vacuum Pump. Figure 1-8 Properties of the Refrigerant at 105℉ H 1 is the saturated suction of the compressor at -20ºF. 6 PSI and the pressure of R-134a is 22. Buy R134a gas online and pick up your AC recharge can in an AutoZone near you today. R134a refrigerant O-rings are of a different composition than those for R12 systems. The properties (of refrigerants R134a, R1234yf, and R1234ze) such as enthalpy, entropy, pressures, and temperatures are given in the form of inbuilt functions in EES and are called in the EES program for calculation of parameters, namely, cooling effect, compressor work, and heat rejected in condenser. The pressure-enthalpy chart, as shown in Fig. 9 m and d=2 mm, etc. gov for site licenses and distributor agreements. Refrigerant MP39. There is currently serious consideration of replacing it with R744 (Carbon Dioxide) in refrigeration and heat pump applications. Everything that occurs in the saturation zone is a latent (change […]. Since this is a ln Pressure-Enthalpy graph, the enthalpy is marked on the x-axis. R134a R290 R22 R407C R717 R507 R410A R22 NH 3 R404A/R507 Propane R407C R410A R134a R22 & its near neighbors Comparison of Simple Cycle EER R22 R134a R290 R407C R507 R410A 0. The tables contained on this page list approved refrigerant numbers from ANSI/ASHRAE 34-2019, Designation and Safety Classification of Refrigerants, the latest edition of Standard 34, which describes a shorthand way of naming refrigerants and assigns safety classifications based on toxicity and flammability data. It's a measure of the system's capacity to release heat and perform non-mechanical work. R-22, R-410A, R-407C, R-134A R-404A REFRIGERANTS. From Figure 1-5, 1-7 and Figure 1-8, the enthalpy values of the various points of the. AHRI is now specifing that all refrigerant containers should have one uniform paint color, grey RAL 7044 and that the previously assigned colors should be transitioned to the new standard color by 2020. 0) Global Warming Potential (CO 2 = 1. R134a Property Diagrams: Pressure-Enthalpy Diagram; Enthalpy-Entropy Diagram. R134a handling. That means it's slightly colder than the R-12 according to the charts supplied. The hot gas leaving the compressor condenses in the condenser via heat transfer to the environment. R-134a containers should be stored in a cool and ventilated area away from heat. The car air is cooled by blowing it across tubes in a heat exchanger. A very good match to R-12 for air conditioning, high and medium temperature usage. Knowing how to construct and interpret a pressure enthalpy (PH chart separates the good technician from the very good service engineer. 14 psig can condense into a liquid, if it is cooled below its corresponding (saturation) temperature of 48. The P-H diagram is a graphical representation of the refrigerant as it travels through the refrigeration system. With the A/C turned OFF - On a cold day the pressure will be low, on a hot day the pressure will be high. Without good understanding of the refrigeration cycle and what is happening in each process, you will be spending more time guessing rather than solving the problem. A/C Pro ACP-100V R134a Premium Refrigerant with Hose and Ga…. Table and mollier chart of the thermodynamic properties of 1, 3. Product - Kool AC A/C Manifold Vacuum Gauge Hose Diagnostic Set, 5FT, Refrigeration, R410 R22 R134A R404A With Case. Add an R134a compatible drier/accumulator. Psychrometric chart is defined as the representation of air properties, in graphical form. As part of my studies,i need to write a MATLAB code to plot P-H chart of R134a Refrigerant. Comparison chart for HFC and HFO replacement refrigerants. 1993 Trichlorofluoromethane (R-11) CCl 3F 137. 115 Volt 1-Phase Compressor R134A (Copeland) Rollover image above to zoom. For the moment we won’t be addressing low side pressures. R450A is a zeotropic blend and has a temperature glide of 0. 70mm internal diameter was experimenta…. KLEA® 134a pressure-enthalpy diagram. agent frigorific, R134a tabel. The following charts were primarily developed to enable a wholesaler and/or contractor to easily select an expansion valve in the field. 90% lesser than R22 and R134a is better than R22 by 7. Title: mollier_chart_met. English conversion factors and data 36 33. Maximum power calculations for a typical water heat pipe are shown in Figure 5. R134a pt chart gonmo tbcct co r134a air conditioning filling chart refrigeration basics definitions part 2 two phase flow in pressor springerlink 134a Pressure Chart Gallery Of 2019134a Pressure Chart Gallery Of 2019R134a Pt Chart Gonmo Tbcct CoRefrigerants Temperature And Pressure ChartsR134a Pt Chart Gonmo Tbcct CoRefrigerants Temperature And Pressure At Constant BoilingSolved Using The…. Across the top row are listed several common refrigerants. Find many great new & used options and get the best deals for R-134A / R-1234yf MAGNETIC Pressure Temperature Chart 8"x5. Tetrafluoroethane (R134a) Safety Data Sheet P-6213 This SDS conforms to U. Scroll down to find download buttons for pressure enthalpy charts in either Metric or Imperial Units. PO Box 13, The Heath, Runcorn, Cheshire, WA7 4QX Tele: (01928) 511192 Fax: (01928) 513890. Agree that you need to make sure the hot water to the heater is turning off but if no cold air when the engine is first started (no hot water to the heater) you are low on freon. This A/C Manifold Gauge Set can be used to test, evacuate and fill automotive air conditioning systems. 1 REFRIGERATION AND REFRIGERATION SYSTEMS 9. Equations displayed for easy reference. 9906: 0: 2,967: 1,000 A2: 70,000: 310: 109. The local atmospheric pressure is 88 kPa. THIS INFORMATION HAS BEEN FULLY CHECKED FOR ACCURACY BUT IS A GUIDE ONLY - reading and writing sourcebook pdf. High Pressure Brazed Plate Heat Exchangers for R22, R134A, R401A and R407C are perfect for your high pressure gas process requirments, both Industrial and Commercial. We have R134a refrigerant capacity guide doc, DjVu, PDF, txt, ePub forms. Pressure-enthalpy table for R-134a (Pages 830-832 of textbook) 23. From testing the system it is seen that R134a has the higher COP, R22 has the highest heat transfer, air heat transfer as fan speed increases and R134a has the highest, realistic heat transfer effectiveness under same refrigerant-side temperature and pressure testing conditions. 75 = R134a charge). In this case, a two stage cycle. Son , Evaporation flow pattern and heat transfer of R-22 and R-134a in small diameter tubes, Heat Mass Transf. It is not intended to provide all possible issues covering any system modifications and operation or servicing of production R-1234yf mobile air conditioning systems. AquaForce® Air-Cooled Liquid Chiller. 0 Chemical Structure Uses HFC-134a can be used in. This simple fix recharges the R-134a (freon), stop leaks & gets your car A/C cold again. A chart, named known as the psychrometric chart is formed, incorporating all six parameters. On the cycle page, you will see a schematic of the cycle with the main points labeled. This pocket size device offers fast and accurate temperature references on a large easy to read LCD display. At 30 psig ‐ ‐R‐134a boils at 35⁰ The Pressure of theF evaporator will control it’s Temperature An R134a temperature‐pressure chart shows what the refrigerant. R-134A Refrigerant Pressure Temperature Chart - R-134A is an inert gas also known as Tetrafluoroethane, and for air conditioner systems. R-410A – Application Experience D. Agree that you need to make sure the hot water to the heater is turning off but if no cold air when the engine is first started (no hot water to the heater) you are low on freon. If a subcooled liquid has a known pressure of 3. HFC-134a ØUp to 10% reduction in indirect emissions vs. Refrigerant R134a is a hydrofluorocarbon (HFC) that has zero potential to cause the depletion of the ozone layer and very little greenhouse effect. Data, 23:657–729, 1994. Code to add this calci to your website. As an  HVAC/R professional or a building operator, you may face issues in the refrigeration part of your system such as high suction pressure. Vehicles manufacturers, dealerships, auto repair shops, industrial and commercial contractors have turned to Robinair for A/C service products since 1956. The coefficient of performance can be compared to the efficiency in a work machine. The R-134a enters the heat exchanger pipes as a saturated mixture at 320 kPa and quality = 0. 2; Water-sidedatafor the 26-fpi geometry in HFC-134a inundation. Heat Pump System HFC−410A Total equivalent length = 240 feet (Piping & all fittings, etc) NOTE − Length is general guide. Effect of refrigerant charge quantity on heat rejected by condenser (q c):-Fig. Test your P-T know-how and use of P-T relationships by downloading Using P-T Analysis as a Service Tool Bulletin Form 10-35 / 52013 and taking the test at the end. EXAMPLE: Chart Reads. Hence, the entropy change for refrigerant R-134a from process 1-2 is. 14 psig can condense into a liquid, if it is cooled below its corresponding (saturation) temperature of 48. 1 ton= 200 Btu/minute. Refrigerant Flow. / + Heat pump R134a 750/970 ±10 SP-A2 PAG46yf 230 i8 (I12) Hybrid 03. In the Mollier diagram the mj e16vx s1 pdf absolute humidity content in the air is shown along the x-axis. ) The compressor inlet temperature equals 50 degrees. Jug - R12, R134A, R500, R401A/B, R409A, R414B, R416A, R420A, R426A, R437 & R414A Replacement. 01°C) and the critical point (373. tecquipment. See Figure 2. In particular, the exergy-enthalpy chart of R 134a in SI units, and both R12 and R134a diagrams showing the overall performance for five different plant schemes, are given. or metric units. A/C Hyundai refrigerant filling quantities R134a an 1234yf. It can be used for recharging refrigerant, or to diagnose an a/c system based on pressure readings from your gauges. R134a does not degrade ozone but it is a significant global warming gas and is flammable when mixed with its lubricating oils. The blue line on the left of the bubble represents the 100% saturated liquid line,. 3 psig is 36 ° F for R-134A. Refrigerant MP39. Year Model Lubricant 100 SERIES. 2: HCFC: R-420 A: R-134a/142b (88+1,-0/12+0,-1) 88+1,-0% C 2 H 2 F 4 · 12+0,-1% C 2 H 3 F 2 Cl: Choice Refrigerant: 14. COMPATIBILITY OF REFRIGERANTS AND LUBRICANTS WITH MOTOR MATERIALS Final Report May 1993 Robert Doerr and Stephen Kujak The Trane Company La Crosse, WI ABSTRACT Compatibility test results for 11 pure refrigerants and 17 refrigerant-lubricant combinations with 24 motor materials are included in this report. During this time, only liquid R-134a t10ws from the container. Forane® Refrigerant Pressure Temperature Chart Red Numerals (in bold and italics)- Inches Hg. The nozzle entrance diameter is 120 mm. quantity of Freon charge, the flow chart of the experimental test is shown in Fig (4) Fig. 370 HFC-143a 0. Calculation of thermodynamic state variables of tetrafluorethane - R134a. Then, at the end of the chapter which deals with pressure-enthalpy charts in my textbook, the following statement is written: "These charts and tables are not normally used in the field for troubleshooting but are for engineers to use to. HFC refrigerants are much less harmful to the ozone layer, but still has some effect. These PH diagrams are available for all the common refrigerant gasses. R513A (Opteon® XP10) is a low Global Warming Potential (GWP) HFO refrigerant blend, used as a replacement for R134a in medium and high temperature refrigeration applications. R-12 O-rings are black in color. T ::-4 °C, H 1782k. If your car is low on R134a, it can¿t cool as efficiently. XP10 Versus R-134a Calorimeter Test 65F Return Gas Temperature 90% 92% 94% 96% 98% 100% 102% 104% 106% 108% 110% 80F 80F 80F 80F 105F 105F 105F 105F 120F 120F 120F 120F Evaporator/Condenser Condition-134a Rel EER Rel Cap Experimental Study Of R134a Alternative In A Supermarket Refrigeration System by Barbara Minor, Dr. Note: R134a has a Global Warming Potential (GWP) of 1300 with respect to Carbon Dioxide. 945 m and d=0. This is a very useful tool that takes the guess work out of charging cooling systems. This is a BRAND NEW EMBRACO Refrigeration Compressor with Model # FFI10HBX(1). This is a haloalkane refrigerant with thermodynamic properties similar to R-12 (dichlorodifluoromethane) but with insignificant ozone depletion. 314 J/(mole) (K) for HFC-134a, R = 0. 4 x 200 Btu/minute = 800 btu/ minute 800 Btu/minute / 50 Btus/lbs = 12. Click a link below to open a chart: Pressure/Temperature Chart of Common Refrigerants. 34 kg, at which time the valve is closed. 42 (at best) w/ 134A in 2000 isuzu trooper 37 in 2005 tacoma, R134A temps should be measured 1" from vent. The index LCL0 inhalation in rats during 4 hours is less than 500,000 ppm and NOEL in relation to heart problems is about 75,000 ppm. Download Pressure Temp Chart (PDF) Download Pressure Enthalpy Chart (PDF) Download Safety Data Sheet (PDF) R134a HFC refrigerant widely used for medium temperature and auto A/C applications. CE Compass 7 Level Freon Halogen Refrigerant Gas Leak Detector R410a R134a HVAC Tool CFC HFC Leak Detection Tools High Sensitivity Green Heat Pump With Electric. tube shell exchangers: gaskets selection t series r134a-selection chart t-series-r134a-selection-chart. Di Bella, P. T-s diagrams of heat pump dryer for R22 or R134a and that for R744 are shown in Figs 3 and 4. Insert a thermometer in the dash center vent. Problem is, all the good information that I ha. R-410A Pressure-temperature chart. \爀䤀猀 愀 挀愀瀀椀氀氀愀爀礀 琀甀戀攀 愀 爀攀最甀氀愀琀椀渀最 攀砀瀀愀渀猀椀漀渀 搀攀瘀椀挀攀. R134a swells the rubber components in the refrigeration system and causes leaks. Note: Underline figures are in. If you have to do repairs, recheck your temperatures. R134a Side Can Tap design makes servicing A/C systems with 12 oz. R134a 630 ±10 SP-A2 PAG46yf 230 X1 (E84) 10. Kiselev and M. R-22, R-410A, R-407C, R-134A R-404A REFRIGERANTS. Title: R134a col. bas file for refrigerant R-134a. refrigerant was R-32 (difluoromethane) followed by R-410A, ammonia, R-22, R-407C, propane, R-134a, R-125, and butane. These diagrams can be found in the ASHRAE Fundamentals book R134a Ph Diagram. Place another thermometer (B) near the blower. Carbon Dioxide: Pressure - Enthalpy Diagram Melting Line-40 o -40 C-2 0-2 0 t = 0 o C 0 0 20 40 40 60 60 80 80 100 100 120 120 140 140 160 160 180 180 200 200 220 220 Enthalpy, kJ/kg Pressure, Bar Drawn with CO2Tab TM ChemicaLogic Corporation www. 04/01/E 3 2 Introduction The refrigerant Solkane®134a is a long term replacement for the chlorofluorocarbon (CFC) R12. /+ Heat pump R134a/ R1234yf. Pharmaceutical and Sanitary Heat Exchangers. 76 : 145: 87. 0 Btu/lb at -40 °F (-40 °C) s f = 0. refrigerant R134a) versus evaporator temperature for different TD values and constant polytropic efficiency. are superior to both R134a and R404a. This can be achieved by displacing a portion of the internal condenser volume with vapour free liquid refrigerant. Heat energy added to. R134a/R1234yf Airconditioning Filling Chart > (PC & LCV only! For Trucks see total list on www. The following arguments are the independent variables preceded by a single identifying letter and an equal sign. Pressure Enthalpy Chart Of Rankine Cycle With R134A For First Stage. When the air conditioner in your 2011 Dodge Nitro starts blowing hot air, you likely have a freon leak. R-410A – Application Experience D. 01°C) and the critical point (373. All of the R-407-series refrigerants are based on blends of the three HFC refrigerants R-32, R-125 and R-134a. Nomenclature h enthalpy kJ/kg S entropy, kJ/kg K. Figure 1G applies to HFC-134a, the subject of this text. HFO-1234yf is the first in a new class of refrigerants acquiring a global warming potential (GWP) rating one 335th that of R-134a (and only 4 times higher than carbon dioxide, which can also be used as a. PT CHART FOR GENETRON® 422D New Pressure-based Charts Make Calculating Glide Easier Refrigerants SUPERHEAT Procedure: • Use gauges to determine the press ure at the evaporator coil outlet, and a thermometer to get the actual temperature at the same point. The log P/h diagrams on this page can be retrieved from the Coolpack program, which can be downloaded here. *PH: Pressure / Enthalpy REFRIGERANT PRESSURE/TEMPERATURE CHART The RPT Chart Master is a compact digital pressure temperature chart. : H-39916-1. R134a Alok Bharadwaj 1*, Anirudh V Kaushik , Aditya S N 1 and Aayush Tandon *Corresponding Author:Alok Bharadwaj, [email protected] 0 kJ/kg; s = 1. From: $2,290. This definition of enthalpy can be expressed, mathematically, as follows: h = u + p. Heat energy removed from the refrigerant below this "base point" results in negative enthalpy. R513A (Opteon® XP10) is suitable in new systems as well as for retrofit of existing systems. Refrigerant Pressure Temperature Chart For 41600 Series Manifolds or Universal Application. R134a refrigerant (amount varies by model. / + Heat pump R134a 750/970 ±10 SP-A2 PAG46yf 230 i8 (I12) Hybrid 03. Heat transfer analysis of R134a Hello, I would like to ask if I want to model the R134a material at a specific pressure say 1000 kPa, I would need to edit the default pressure of the scenario environment. R134A : Introduction 1,1,1,2-tetrafluoroethane, R-134a, Forane 134a, Genetron 134a, Florasol 134a, Suva 134a or HFC-134a, also known as norflurane (INN), is a haloalkane refrigerant with thermodynamic properties similar to R-12 (dichlorodifluoromethane) but with insignificant ozone depletion potential. The conversion is determined by multiplying the R12 charge value by. Now, the industry standard is R-134a, which is an efficient absorber and carrier of heat without the ozone layer-damaging issues of R-12. or metric units. The ozone depletion is a global problem like global warming. 75-EG1 (410). Mollier Chart in Metric Units (PDF file) (62 KB. AquaForce® Air-Cooled Liquid Chiller 30XA. Most 1996 and newer A/C systems use R134a refrigerant and require some type of PAG (polyalkylene glycol) oil for the compressor. The hot gas leaving the compressor condenses in the condenser via heat transfer to the environment. 00 PLACE ORDER with credit card. If your low side pressure is low, and engine at idle or slightly higher, check receiver tank, again if a lot of bubbles, you are short charged. In order to find the temperature, we need to use the Superheated R-134a Vapor Table in the SHV_Tables file with P = 4 bar. The aftermarket states that you should be adjusted back 3 to 4 PSI with R-134a in order to achieve the same temperature. This study is. Pressure-enthalpy diagram for superheated R-134a (Page 834 of textbook) 25. Temp (°F) R-22 R-407C Liquid Pressure R-407C Vapor Pressure R-410A Liquid Pressure R-427A Liquid Pressure R-427A Vapor Pressure R-407A Liquid Pressure R-407A Vapor Pressure R-123 R-12 R-134a R-409A Liquid Pressure. For the moment we won’t be addressing low side pressures. Year Model Lubricant 100 SERIES. pdf FREE PDF DOWNLOAD. R134a Refrigerant – Klea® 134a Widely accepted as the most appropriate alternative for R-12 over the majority of the application range for both retrofit and new equipment. Printable and fillable R134a Refrigerant Pressure Temperature Sample Chart. tions tables diagrams. Figure 1-8 Properties of the Refrigerant at 105℉ H 1 is the saturated suction of the compressor at -20ºF. 314 J/(mole) (K) for HFC-134a, R = 0. 77796 ft3/lb m? 90 psia 34 Review Last Problem. Figure 1G applies to HFC-134a, the subject of this text. When R-134a was first used in cars, it was not uncommon to notice that the new refrigerant simply did not cool as well as the older R-12. R134A : Introduction 1,1,1,2-tetrafluoroethane, R-134a, Forane 134a, Genetron 134a, Florasol 134a, Suva 134a or HFC-134a, also known as norflurane (INN), is a haloalkane refrigerant with thermodynamic properties similar to R-12 (dichlorodifluoromethane) but with insignificant ozone depletion potential. HVAC & Refrigeration Tools. This page shows log P/h diagrams for the following refrigerants: R744 (Carbon dioxide) << back | next >> Refrigerant handbook. R-134a TEMPERATURE PRESSURE CHART (Tabla de Temperaturas y Lecturas). 2% in density, ±1. P 2 = 200 kPa T 2 = T sat. If the refrigerants are mixed, compressor failure is likely to occur. Pressure-enthalpy diagram for Freon 12. It has the formula CH2FCF3 and a boiling point of '26. Training Manual. Nomenclature h enthalpy kJ/kg S entropy, kJ/kg K. HFC-134a [reduced fuel usage] vAC system considerations ØHFC-152a and HFC-134a have nearly identical pressure / temperature curves-minimal component changes required ØCooling performance and overall energy efficiency are better than. It is an energy-efficient alternative to R-134a in different medium temperature systems: • Heat pumps • Air-cooled and water-cooled chillers • District heating and cooling • Vending machines and beverage dispensers. Air-Air is also a VERY poor heat transfer platform. accuracy of the equation of state is estimated to be ±0. charge of 8. Downloads as a PDF. Low ∆P High ∆P High to Low Side ∆P. As an example for a beer cooler: The desired box temperature is 36 ° F; the system is R-134A refrigerant. The bubble to the left is the portion of the diagram where the refrigerant is in the saturated condition. Pressure-enthalpy table for R-134a (Pages 830-832 of textbook) 23. MKV190CL2J/SM1 CMP,COMP,REFRIGERATOR,R-134A: $180. XP10 Versus R-134a Calorimeter Test 65F Return Gas Temperature 90% 92% 94% 96% 98% 100% 102% 104% 106% 108% 110% 80F 80F 80F 80F 105F 105F 105F 105F 120F 120F 120F 120F Evaporator/Condenser Condition-134a Rel EER Rel Cap Experimental Study Of R134a Alternative In A Supermarket Refrigeration System by Barbara Minor, Dr. 976-979 – Guess that this is gas and look in “superheated” tables on page 979 – v = 0. R134a refrigerant O-rings are of a different composition than those for R12 systems. As R1234yf is an A2L mildly flammable substance, SAE standards have been developed for hoses and couplings. R134A Temperature - Pressure Chart. Overall Heat Transfer Coefficient Table Chart: The heat transfer coefficient is the proportionality coefficient between the heat flux and the thermodynamic driving force for the flow of heat (i. 75-o1 (519) issue date: may 10, 2019. The first argument of the function is the substance name, R134a in this case. R-22, R-134a, R-410A, R-407C (GWP) air conditioners and/or heat pumps. The data in these charts was derived using. Enthalpy is a thermodynamic property that is the sum of the internal energy that is added to a system and the product of its pressure and volume. But the reverse process (i. 6) Repeat this procedure 2 –3 more times. Figure 2: Pressure enthalpy chart for R744 A significant challenge with the application of CO 2 as a refrigerant is the higher operating pressures compared to other commercial refrigerants. Determine the specific volume of refrigerant-134a at 1 MPa and 50{eq}^{\circ} {/eq}C, using (a) the ideal-gas equation of state and (b) the generalized compressibility chart. value on the chart, and vh is the higher value on the chart. PT CHART FOR GENETRON® 422D New Pressure-based Charts Make Calculating Glide Easier Refrigerants SUPERHEAT Procedure: • Use gauges to determine the press ure at the evaporator coil outlet, and a thermometer to get the actual temperature at the same point. The symbol for enthalpy is “h. refrigerant R134a) versus evaporator temperature for different TD values and constant polytropic efficiency. A comparison between experimental and predicted values validated that the heat transfer. If the compressor consumes 1. , from a high temperature region to a low temperature region. R-134A, R-22, R-507/AZ50 and R-404A 32 28. Now, the industry standard is R-134a, which is an efficient absorber and carrier of heat without the ozone layer-damaging issues of R-12. The content and the intellectual layout in this chart are property of NRF BV. I have the numbers to follow: When I first hooked up, I had a 2 psi suction pressure and a 65 degree suction line temp. Add New Question. As an  HVAC/R professional or a building operator, you may face issues in the refrigeration part of your system such as high suction pressure. Attached are the Excel VBA fluid property. APPENDICES APPENDIX 11 (a) PRESSURE/ENTHALPY CHARTS FOR REFRIGERANTS (a) Tetrafluoroethane (refrigerant 134a) reference state h = 200. Enthalpy is a thermodynamic property that is the sum of the internal energy that is added to a system and the product of its pressure and volume. A new generation of CO2-based heat pumps could avoid the high global warming potential of standard refrigerants and generate much higher temperatures A Mayekawa Unimo air-to-water heat pump installation in Australia. 4 Flow Chart of charging procedure 7. If your car is low on R134a, it can¿t cool as efficiently. Frank Rinne, Dr. Ever since 1993 R-134a has been the staple refrigerant for automotive applications. A "good" service technician can find the usual problem - it takes a "very good" service technician to find the unusual! Knowing how to construct and interpret a pressure enthalpy (PH chart separates the good technician from the very good service engineer. R-134a Properties - Imperial Units. Low side pressures affect inside temp. chemicalogic. Heat energy added to. ENTHALPY (kJ/kg) 160 ENTHALPIE Val 280 ENTHALPIE 100. Vehicles manufacturers, dealerships, auto repair shops, industrial and commercial contractors have turned to Robinair for A/C service products since 1956. Find many great new & used options and get the best deals for R-134A / R-1234yf MAGNETIC Pressure Temperature Chart 8"x5. R-404A/R-507 is not compatible with the seal material used in the R-22 Moduload Unloading System. Created Date: 2/4/2016 6:03:29 PM. 3: Row data for the 26-fpi geometry in HFC-134a inundation 180 Table C. AquaForce® 30XA chillers were designed from the ground up to meet the efficiency demands of today and the future by providing premium air-cooled chiller packages for contractors, consulting engineers and building. T ::-4 °C, H 1782k. The same applies to conversions from refrigerants R22, R502, or R134a to R290. 13- HVCC electric comp. No more looking up the saturation temperature on a chart and calculating the subcool or superheat temperatures. tube shell exchangers: gaskets selection t series r134a-selection chart t-series-r134a-selection-chart. Chapter 10: Refrigeration Cycles The vapor compression refrigeration cycle is a common method for transferring heat from a low temperature to a high temperature. Adverse reactions reported by <3% of the adult and adolescent subjects receiving Ventolin HFA and by a greater proportion of subjects receiving Ventolin HFA than receiving HFA-134a placebo inhaler and that have the potential to be related to Ventolin HFA include diarrhea, laryngitis, oropharyngeal edema, cough, lung disorders, tachycardia, and extrasystoles. 525 East Stop 18 Road Greenwood, IN 46142 317-887-0729 fax: 317-881-1277 web site: www. / + Heat pump R134a 750/970 ±10 SP-A2 PAG46yf 230 i8 (I12) Hybrid 03. mercury vacuum. Toolbox Home. This air conditioning gauges set measure pressure above the atmosphere pressure. Saturated vapor enters the compressor at 0°C and saturated liquid leaves the condenser at 26°C. Sanden compressors come with refrigerant oil already installed. 3 and exits the exchanger as saturated vapor at the same pressure. We do not warrant (neither express nor implied) that the information in this chart is accurate or complete or that any material is suitable for any purpose. Heat energy removed from the refrigerant below this "base point" results in negative enthalpy. It has been in use since the early 1990's and now, in 2019, we are beginning to see it's popularity wane with the rise of the new HFO refrigerant known as R-1234yf. Used for MAC, bus and train A/C, ORC, and medium-temperature stationary applications. As an air-conditioning refrigerant in newer automobiles, the optimal running pressure for R134A is between 22 and 57 pounds per square inch. xls) Mollier Chart in Metric Units (PDF file) (34 KB. Liquid refrigerant will destroy compressors. EXAMPLE: Chart Reads. 5 Ton 60K BTU 80% Efficient One Stage Gas Upflow System. Check the compressor label for the exact amount of refrigerant oil specified for your unit. Low-side pressure at the compressor is 20 psig or 23 degrees F. IF YOU ARE CUSTOMERI acknowledge and affirm that I am purchasing this refrigerant for the sole purpose of resell to an EPA 608 certificate holder, or for use by a licensed EPA 608 certified HVAC installer. R-1234ze can be used in air conditiong chillers, heat pumps, and some other R-134a applications. Pressure Enthalpy Chart Of Rankine Cycle With R134A For First Stage. Heat of Vaporization(bp,BTU/lb. 5 x Enthalpy Difference CFM = FPM x (Duct Area in square feet) CFM = Volts x AMPS X 3. R-134a containers should be stored in a cool and ventilated area away from heat. R134a is an extremely common refrigerant used in a wide range of refrigeration and air conditioning applications, including medium and high temperature refrigeration (both domestic and commercial), residential & light air conditioning, automotive air conditioning and industrial applications such as centrifugal chillers. How to Read a Steam Table Contents: Just as a map (or GPS navigation system) is necessary when driving in a new area or a flight timetable is indispensable when taking the plane, steam tables are essential to steam users in industry. du Pont de Nemours & Co. Pressure Enthalpy Diagram This diagram describes the relationship of pressure and enthalpy of dupot select refrigerant. R134a refrigerant (amount varies by model. Dear all, I'm searching for the Pressure/Temperature conversion formula's for multiple refrigerants. Freon™ MO99 refrigerant has proven to be a reliable and cost-effective, non-ozone depleting retrofit refrigerant. Forane 134a Pressure Temperature Chart Author: Arkema Inc. Energy Efficiency Ratio of R290 is 9. So when an R-134a system is working with a discharge pressure of 171. Posted in replacements and essential properties Tagged banned refrigerants, boiling point, classification of refrigerants, condensing pressure, critical temperature, dielectric strength, Green Refrigerant, HCFC, hvac refrigerant types, latent heat, List of refrigerants, Ozone Layer, properties of r22 refrigerant, r-401b Refrigerant, r11. Replacement in Mobile Air Conditioning (MAC) as well as bus and train A/C - Car manufacturers are replacing it with Solstice ® yf. If the wrong type of compressor oil or the wrong viscosity compressor oil is used, it may damage the compressor. R134a refrigerant (amount varies by model. SUBJECT: TEMPERATURE - PRESSURE CHART FOR FYI #289 9/17/2009 R-22, R-410A, R-407C, R-134A & R-404A REFRIGERANTS ADVANTAGE Engineering, Inc. View Notes - Enthalpy diagram Charts from EIN 4321 at University of Florida. 14- HVCC electric comp. First, an explanation of how the diagram is built up is given, and then its use is describ ed. 4 bar and 0oC at a volumetric flow rate of 0. Everything that occurs in the saturation zone is a latent (change […]. In this region there are vertical temperature lines, which t134a as enthalpy is increased. Jug - R12, R134A, R500, R401A/B, R409A, R414B, R416A, R420A, R426A, R437 & R414A Replacement. NOTE! Refrigerant and oil capacity guides are based on data provided by sources such as AllData and Mitchell. 34 kg, at which time the valve is closed. Steam expansion in the turbine on the h-s (mollier) chart. Released as a 45 rpm single on July 9, 1963, on the Motown subsidiary Gordy label, it hit number 1 on the Billboard Hot R&B chart—where it stayed for four weeks—and peaking at number 4 on the Billboard Hot 100. The R-134a enters the heat exchanger pipes as a saturated mixture at 320 kPa and quality = 0. Carbon Dioxide: Pressure - Enthalpy Diagram Melting Line-40 o -40 C-2 0-2 0 t = 0 o C 0 0 20 40 40 60 60 80 80 100 100 120 120 140 140 160 160 180 180 200 200 220 220 Enthalpy, kJ/kg Pressure, Bar Drawn with CO2Tab TM ChemicaLogic Corporation www. This can be achieved by displacing a portion of the internal condenser volume with vapour free liquid refrigerant. kg of saturated liquid R-134a at 30 degrees C. At this stage in the refrigeration cycle, high pressure liquid refrigerant will flow down the liquid line, through a filter drier that is designed to prevent contaminants from flowing through the system, and on to. This article is written by my buddy and Canadian Supertech Tim Tanguay. Thermodynamic heat pump cycles or refrigeration cycles are the conceptual and mathematical models for heat pumps and refrigerators. R134a has a global warming potential GWP 1300 times the value. The R134A refrigerant is called Tetrafluoroethane and classified as one of the HFC gases from the other refrigerant variants out there. Download free printable R22 Temperature Pressure Chart Template samples in PDF, Word and Excel formats. Here is the Latent Heat table which shows the latent heat of vaporization and change of phase temperatures for some of the common fluids and gases. Furnace & Ancilliaries Checklist. The composition of R450A is 58% R1234ze and 42% R134a. R-452B Opteon XL55 A2L 698 676 Air Conditioning and Heat Pumps REFRIGERANT INFORMATION CHART R-404A Replacements R-134a Replacements R-422D, R-417A Replacements. 185053 Btu/lb = (psia·ft3)/lb·J Reference point for enthalpy and entropy: h f = 0. tecquipment. The total superheat calculation is as follows: Degrees compressor in temperature (50 degrees) minus saturation temperature (23 degrees) equals total superheat (27 degrees). That means it's slightly colder than the R-12 according to the charts supplied. In ORC, replace it with Genetron ® 245fa. Find a c now online! 2014 Bmw F32 F80 F82 F83 M4 M3 435xi Heater Ac Radio Cd Control Panel $59. The package is based on the open source CoolProp library. Posted in replacements and essential properties Tagged banned refrigerants, boiling point, classification of refrigerants, condensing pressure, critical temperature, dielectric strength, Green Refrigerant, HCFC, hvac refrigerant types, latent heat, List of refrigerants, Ozone Layer, properties of r22 refrigerant, r-401b Refrigerant, r11. Expander Swage Tool Kit. = Φ(out)/P(in) It is usual to find a convenient source of low grade heat for the evaporator such as the. There was a reduction in cooling capacity by 9% when compared with R134a at the same operating. Created Date: 6/19/2012 3:09:17 PM. SI Charts are available for SI Boards. Technically we should therefore address as how much heat energy substance. Calm, Engineering Consultant 2008. ammonia r717 pressure enthalpy chart. R134a and water have the same abilities to change the state, but R134a can do this more. Subtract our initial enthalpy value at 40o C ( 167. 19 186 18,588 18. This can be achieved by displacing a portion of the internal condenser volume with vapour free liquid refrigerant. R450A is a zeotropic blend and has a temperature glide of 0. ) in the inlet and/or intermediate vertical header, which are commonly used in the outdoor heat exchangers in heat pump mode. The thermodynamic property functions, such as enthalpy and volume require a special format. With the A/C turned OFF - On a cold day the pressure will be low, on a hot day the pressure will be high. 185053 Btu/lb = (psia·ft3)/lb·J Reference point for enthalpy and entropy: h f = 0. Pressure Temp. It shows enthalpy. Furthermore, R134A is a chemical refrigerant in automotive and domestic use air conditioners. , thermal power per unit area, q = d\dot. R 134a P-h (Mollier) Chart Does anyone have a 'beautiful' R-134a P-h diagram? I can find the plain old boring ones online, but, I want a more simplistic one (hopefully with a touch of colour) to put in my report which is a little easier for the supervisor to read. Using the R134A prevented the damage to the ozone layer. The following tables of the properties of steam are taken directly from Chapter 5. 2% in density, ±1. ProperT (New 10/23/2018, Version 2. enthalpy - kj per kg of dry air-15-10-5 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 psychrometric chart barometric pressure 760 mm of mercury. HFCs like R-32 , R-410A are also not much environment-friendly, but they are a lot better than R-22. In these charts the pressure and enthalpy values are shown to scale. , the temperature difference, ΔT): h = q / (Ts - K) where: q: amount of heat required (Heat Flux), W/m2 i. The coefficient of performance can be compared to the efficiency in a work machine. H 5 is the saturated liquid at 105ºF condensing temperature. Liquid Subcooling is normally measured at the liquid line service valve. Methods that can be used to properly charge a system include: 1. Use the ALT + F11 key to see the functions. With a completed pressure enthalpy plot, we can evaluate the major system components as well as calculate latent and sensible heat transfers. R152a also features superior thermodynamics characteristics to those of R134a or HFOs. 05 SFLU-SBURA T/09. Title: R134a col. Pressure Enthalpy Charts | Industrial Controls. At 30 psig ‐ ‐R‐134a boils at 35⁰ The Pressure of theF evaporator will control it's Temperature. Psychrometric chart is defined as the representation of air properties, in graphical form. Freon Products Division FIGURE 1H. 5) ounce increments - charge the system to the next highest quantity of R134a. 015 bar bar upper limit: 100 C, 39 bar. 00 kJ/(kg-K) for saturated liquid at 0°C. R134A : Introduction 1,1,1,2-tetrafluoroethane, R-134a, Forane 134a, Genetron 134a, Florasol 134a, Suva 134a or HFC-134a, also known as norflurane (INN), is a haloalkane refrigerant with thermodynamic properties similar to R-12 (dichlorodifluoromethane) but with insignificant ozone depletion potential. Additionally, HVAC Systems such as chilled water systems in both commercial markets and industrial markets. Figure 1: P-h chart. A/C Mitsubishi refrigerant filling quantities R134a an 1234yf. R134a refrigerant (amount varies by model. Refrigerant R134a or HFC-134a was developed to meet these needs. : H-39916-1. Comprehensive assortment of A C and. : H-39917-1. The properties (of refrigerants R134a, R1234yf, and R1234ze) such as enthalpy, entropy, pressures, and temperatures are given in the form of inbuilt functions in EES and are called in the EES program for calculation of parameters, namely, cooling effect, compressor work, and heat rejected in condenser. R134a is a HFC, used in automotive air conditioning and as a replacement for R12 and R22 in medium and high temperature refrigeration applications, such as commercial and domestic refrigeration and chillers. C Suction/bar Ambient temp/gr C Discharge/bar-8,9 1,1 10,0 7,9-6,7 1,2 12,8 8,6. 75 = R134a charge). tions tables diagrams. R-134a has the formula CH2FCF3. Always use manufacturer's recommendations first before using a standard Subcooling chart. 179 Table C. Some of these refrigerants in the Real Fluids category, e. Refrigerant Pressure Temperature Chart | HVAC Refrigeration - This page offers a temperature pressure relationship chart for use in working with HVAC Systems that use R-410A, R-22, and R-134A. PRESSURE-ENTHALPY CHARTS AND THEIR USE By: Dr. R 134a P-h (Mollier) Chart Does anyone have a 'beautiful' R-134a P-h diagram? I can find the plain old boring ones online, but, I want a more simplistic one (hopefully with a touch of colour) to put in my report which is a little easier for the supervisor to read. It is not allowed to copy. Results and Discussion 1. The heat absorbed is called the refrigeration affect. "Heat Wave" is a 1963 song written by the Holland–Dozier–Holland songwriting team. The conversion is determined by multiplying the R12 charge value by. • Use only specified lubricant for the R-134a A/C system and R-134a components. R-410A, sold under the trademarked names AZ-20, EcoFluor R410, Forane 410A, Freon 410A, Genetron R410A, Puron, and Suva 410A, is a zeotropic but near-azeotropic mixture of difluoromethane (CH 2 F 2, called R-32) and pentafluoroethane (CHF 2 CF 3, called R-125) that is used as a refrigerant in air conditioning applications. how many pounds of refrigerant must flow through a 4 ton evaporator each minute if each pound has an enthalpy of 50. Saturation Pressure-Temperature Data for R-134a psig. ** = exceeds critical temperature Vacuum-Inches of Mercury Bold Italic Figures Pressure-Pounds Per ® Square. 1 on the compressor. charge of 8. You can also use PAG (Poly Alkylene Glycol) or Castrol Retro Oil for lubricant. The system should be recovered, vacuumed (min 20 minutes) and charged. From Figure 1-5, 1-7 and Figure 1-8, the enthalpy values of the various points of the. It is also being used as the heat transfer fluid in secondary loop systems. It is recommended that system operating conditions. 28) The symbols p c and T c denote the temperature and pressure at the critical point for the particular gas under. A Refrigerant Temperature Pressure Reference Chart Shows Pressures at Various Temperatures for R22, R134A, R407C, R404A, R410A, R507A. 77796 ft3/lb m? 90 psia 34 Review Last Problem. Used for MAC, bus and train A/C, ORC, and medium-temperature stationary applications. As an example for a beer cooler: The desired box temperature is 36 ° F; the system is R-134A refrigerant. Pharmaceutical and Sanitary Heat Exchangers. Total Superheat Method (Fixed Orifice / Piston / Capillary Tube / Non-TXV) Temperature must be above 55°F outdoors and above 70°F indoors with a indoor wet-bulb temperature above 50°F The evaporator coil cannot operate below freezing or an overcharge and possible compressor damage could result. 5 LBS of R-134A at the high side compressor connection after a heat soak hot start at times. When the air conditioner in your 2011 Dodge Nitro starts blowing hot air, you likely have a freon leak. Mollier charts are also called Pressure-Enthalpy diagrams. 75-o1 (617) form 160. In order to find the temperature, we need to use the Superheated R-134a Vapor Table in the SHV_Tables file with P = 4 bar. P65Warnings. Figure 1G applies to HFC-134a, the subject of this text. : H-39916-1. R513A consists of 56% R1234yf and 44% R134a, it is an aceotropic blend with no temperature glide. Hence in refrigeration systems we call the total heat as enthalpy which is the sum of sensible and latent heat. This example models a vapor-compression refrigeration cycle using two-phase fluid components. com N a t u r a l Ref r i g e r a n t s. 5" at the best online prices at eBay! Free shipping for many products!. PRESSURE-ENTHALPY CHARTS AND THEIR USE By: Dr. When the air conditioner in your 2011 Dodge Nitro starts blowing hot air, you likely have a freon leak. The pressure-enthalpy chart, as shown in Fig. View steam_tables_r134a. I finally got my p. Comparison of R134a and R1234ze for New Chiller Systems and for Fluid (Drop-In) in Existing Systems Francis A. 1: Refrigerant-side data for the 26-fpi geometry in HFC-134a inundation 179 Table C. The tables in this section are reprinted, with permission, from NBS/NRC Steam Tables. You should always attempt to verify the information with your vehicle manual or information provided on the underhood stick, sometimes also located on the top of the accumulator. 5 LBS of R-134A at the high side compressor connection after a heat soak hot start at times. The enthalpy coordinate is skewed and the constant enthalpy lines are parallel and evenly spaced. 0815 kJ/kg • K One atmosphere = 101. The HFO-1234ze isomers: Honeywell has been at the forefront of every major. If the wrong type of compressor oil or the wrong viscosity compressor oil is used, it may damage the compressor. HFC-134a [reduced fuel usage] vAC system considerations ØHFC-152a and HFC-134a have nearly identical pressure / temperature curves-minimal component changes required ØCooling performance and overall energy efficiency are better than. 1993 Trichlorofluoromethane (R-11) CCl 3F 137. ) The compressor inlet temperature equals 50 degrees. Summary- When. The following tables of the properties of steam are taken directly from Chapter 5. The super-heat adds heat to the compressor and raises the over-all discharge temperature. If the super-heat reading is more than 20 degrees above the P/T chart's reading, then add R-22 until the super-heating reading reaches the optimal range -- between 8- and 18-degree super-heat, depending on the environmental conditions. A piston–cylinder device contains 0. AHRI is now specifing that all refrigerant containers should have one uniform paint color, grey RAL 7044 and that the previously assigned colors should be transitioned to the new standard color by 2020. What you need to know: Liquid/vapor dome region. Ac Refrigerant Capacity All Cars R134a Table Filling Chart Youtube Automotive Ac Freon Capacity Chart R 134a System Pressure Chart Ac Pro Php Bloginfo Name. Freon™ 134a, R = 0. Just copy and paste the below code to your webpage where you want to display this calculator. 1200, Hazard Communication. 14- HVCC electric comp. Enthalpy-Entropy Diagram for R134a Refrigerant. Pressure Enthalpy Diagram. Includes 53 different calculations. R134A refrigerant can; Comes with brass threaded fitting for durability. 4 Fluke Corporation Troubleshooting HVAC/R systems using refrigerant superheat and subcooling Measuring liquid line temperature with a DMM and a pipe clamp. Scroll down to find download buttons for pressure enthalpy charts in either Metric or Imperial Units. The nozzle entrance diameter is 120 mm. Replacement in Mobile Air Conditioning (MAC) as well as bus and train A/C - Car manufacturers are replacing it with Solstice ® yf. xls Created Date: 8/26/2002 9:27:19 AM. Very slowly add or refrigerant to lower superheat or remove.