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Freon 410ARefrigerant (R-410A)Thermodynamic Properties (SI Units)New tables of the thermodynamic properties of Freon 410A refrigerant (ASHRAE designation: R-410A [50/50]),have been developed and are presented here. These tablesare based on extensive experimental measurements.Units and Factorst Temperature in CT Temperature in K C 273.15Equations have been developed, based on the Martin-HouP Absolute Pressure in KiloPascals (kPa [abs])equation of state, which represent the data with accuracyvf Volume of saturated liquid in m3/kgand consistency throughout the entire range oftemperature, pressure, and density. Vapor enthalpy andentropy are calculated from the standard Martin-Houequations. Additional equations have been developed forvg Volume of saturated vapor in m3/kgV Volume of superheated vapor in m3/kgdf 1/vf Density of saturated liquid in kg/m3the calculation of saturated liquid enthalpy, latent enthalpy,dg 1/vg Density of saturated vapor in kg/m3and saturated liquid entropy and are presented here.hf Enthalpy of saturated liquid in kJ/kgPhysical PropertiesChemical FormulaCH2F2/CHF2CF3(50/50% by weight)Molecular Weight72.58Boiling Point atOne Atmosphere–51.58 C (–60.84 F)Critical Temperature72.13 C (161.83 F)345.28 K (621.50 R)Critical Pressure4926.1 kPa (abs) (714.50 psia)Critical Density488.90 kg/m3 (30.52 lb/ft3)Critical Volume0.00205 m3/kg (0.0328 ft3/lb)hfg Enthalpy of vaporization in kJ/kghg Enthalpy of saturated vapor in kJ/kgH Enthalpy of superheated vapor in kJ/kgsf Entropy of saturated liquid in kJ/(kg)(K)sg Entropy of saturated vapor in kJ/(kg)(K)S Entropy of superheated vapor in kJ/(kg)(K)Cp Heat capacity at constant pressure in kJ/(kg)( C)Cv Heat capacity at constant volume in kJ/(kg)( C)vs Velocity of sound in m/secThe gas constant, R 8.314 J/(mole) (K) for Freon 410A,R 0.11455 kJ/kg·KOne atmosphere 101.325 kPaReference point for enthalpy and entropy:hf 200 kJ/kg at 0 Csf 1 kJ/kg·K at 0 C

Freon 410ARefrigerantEquationsFor ENG unitsConversion Factors—SI Units to I/P UnitsT and Tc are in R F 459.67, V is in ft3/lb, and P is in psia.Properties listed in the following thermodynamic tables in SIR 0.147852 (psia)(ft3)/lb· R for Freon 410Aunits can be converted to I/P units using the conversionb, Ai, Bi, Ci, and k are constants:factors shown below. Please note that in converting enthalpyA2 –6.407692 E 00A4 –4.134026 E–03B2 3.403745 E–03B4 0.000000 E 00units to H 0 and S 0 at –40 F for I/P units). In theC2 –2.342218 E 02C4 0.000000 E 00conversion equation below, H (ref) and S (ref) are theA3 1.419729 E–01A5 –9.546510 E–05B3 –4.844597 E–06B5 1.173112 E–07C3 9.135529 E 00C5 2.453712 E–02b 6.976251 E–03k 5.750000 E 00and entropy from SI to I/P units, a change in reference statesmust be included (from H 200 and S 1 at 0 C for SIsaturated liquid enthalpy and entropy at –40 C. For Freon 410A, H (ref) 141.1 kJ/kg and S (ref) 0.7666 kJ/kg·K.P (psia) P (kPa [abs])·0.14504T ( F) T[ C]·1.8) 32D (lb/ft3) (kg/m3)·0.062428V (ft /lb) (m /kg)·16.018H (Btu/lb) H (kJ/kg) – H (ref)]·0.43021S (Btu/lb· R) S (kJ/kg·K) – S (ref)]·0.23901Ideal Gas Heat Capacity (at constant pressure):Cp (Btu/lb· F) p (kJ/kg·K)·0.23901C p a bT cT2 dT3Cv (Btu/lb· F) v (kJ/kg·K)·0.23901Ideal Gas Heat Capacity (at constant volume):vs (ft/sec) s (m/sec)·3.2808Cv Cp – R3X and Y are constants used in the vapor enthalpy andentropy equations for the Martin-Hou equation of state:3X 6.779200 E 01Y –7.838900 E–02oooMartin-Hou Equation of StateFor SI unitsCoefficients for the Martin-Hou equation of state areC p and C v kJ/kg·Kpresented below:R 0.114550 kJ/kg·K for Freon 410Ao5P RT/(V–b) (Ai BiT Ciexp[–kT/Tc])/(V-b)ioT is in K C 273.15i 2a, b, c, and d are constants:For SI unitsT and Tc are in K C 273.15 , V is in m3/kg, and P is inkPa (abs).a 2.676084 E–01c –9.848184 E–07b 2.115353 E–03d 6.493781 E–11R 0.11455 kJ/kg·K for Freon 410AFor ENG unitsb, Ai, Bi, Ci, and k are constants:C p and C v Btu/lb· RooA2 –1.721781 E–01A4 –4.329207 E–07R 0.02737815 Btu/lb· R for Freon 410AB2 1.646288 E–04B4 0.000000 E 00T is in R F 459.67C2 –6.293665 E 00C4 0.000000 E 00a, b, c, and d are constants:A3 2.381558 E–04A5 –6.241072 E–10a 6.395995 E–02c –7.264730 E–08B3 –1.462803 E–08B5 1.380469 E–12b 2.808787 E–04d 2.661267 E–12C3 1.532461 E–02C5 1.604125 E–07b 4.355134 E–04k 5.750000 E 00Liquid Enthalpy, Latent Enthalpy, and Liquid EntropyEquationsX and Y are constants used in the vapor enthalpy andSaturated Liquid Enthalpyentropy equations for the Martin-Hou equation of state:hf A BX C(X)2 D(X)3 E(X)4 F(X)5X 2.987192 E 02Y 8.463990 E–01where X (1 – Tr)1/3 – Xo, and Tr T/Tc2

Freon 410ARefrigerantLatent EnthalpyConstants for vapor pressure of saturated vapor (dewhfg hg – hfpoint), pg:Saturated Liquid Entropysf sg – ([hg–hf]/T)A –1.440004 E 00E –3.521484 E 00B –6.865265 E 00F –7.750000 E 00C –5.354309 E–01Xo 2.086902 E–01For SI unitsD –3.749023 E 00hf, hg, and hfg are in kJ/kgBecause both pressure and temperature appear in thesf and sg are in kJ/(kg·K)reduced form in the equation, the same constants can beT and Tc are in K C 273.15used for either SI or ENG units.A, B, C, D, E, F, and Xo are constants:For SI unitsA 2.211749 E 02E 1.052000 E 03T and Tc are in K C 273.15B –5.149668 E 02F 1.596000 E 03P and Pc are in kPa (abs)C –6.316250 E 02Xo 5.541498 E–01For ENG unitsD –2.622749 E 02T and Tc are in R F 459.67For ENG unitsP and Pc are in psiahf, hg, and hfg are in Btu/lbDensity of the Saturated Liquidsf and sg are in Btu/(lb· R)df/Dc Af Bf(1–Tr)(1/3) Cf(1–Tr)(2/3) Df(1–Tr) Ef(1–Tr)(4/3)T and Tc are in R F 459.67Af, Bf, Cf, Df, and Ef are constants:A, B, C, D, E, F, and Xo are constants:A 3.442467 E 01E 4.528092 E 02Af 1.000000 E 00Df 1.819972 E 00B –2.215447 E 02F 6.866152 E 02Bf 1.984734 E 00Ef –7.171684 E–01C –2.717314 E 02Xo 5.541498 E–01Cf –1.767593 E–01Because both density and temperature appear in theD –1.128898 E 02reduced form in the equation, the same constants can beVapor Pressureused for either SI or ENG units.logn (Psat/Pc) 1/Tr (A BX CX DX EX FX )2345For SI unitswhere X (1 – Tr) – Xo, and Tr T/TcTr and T/Tc, both in K C 273.15A, B, C, D, E, F, and Xo are constants:df and Dc are in kg/m3Constants for vapor pressure of saturated liquid (bubbleFor ENG unitspoint), pf:A –1.437600 E 00E –4.068750 E 00B –6.871500 E 00F –1.233300 E 00C –5.362300 E–01Xo 2.086902 E–01Tr and T/Tc, both in R F 459.67df and Dc are in lb/ft3D –3.826420 E 003

Freon 410ARefrigerantTable 1. Freon 410A Saturation Properties—Temperature TableTemp [ C]Pressure [kPa]Liquid pfVolume m3/kg]Vapor pgLiquid vfVapor vgDensity [kg/m3]Liquid 1/vfVapor 1/vgEnthalpy [kJ/kg]Liquid HfLatent HfgEntropy [kJ/(kg)(K)]Vapor HgLiquid SfVapor SgTemp [ 1086–16.5124.7108.2–0.04250.2957–914

Freon 410ARefrigerantTable 1. Freon 410A Saturation Properties—Temperature Table (continued)Temp [ C]Pressure [kPa]Liquid pfVolume [m3/kg]Vapor pgLiquid vfVapor vgDensity [kg/m3]Liquid 1/vfVapor 1/vgEnthalpy [kJ/kg]Liquid HfLatent HfgEntropy [kJ/(kg)(K)]Vapor HgLiquid SfVapor SgTemp [ 415

Freon 410ARefrigerantTable 1. Freon 410A Saturation Properties—Temperature Table (continued)Temp [ C]Pressure [kPa]Liquid pfVolume [m3/kg]Vapor pgLiquid vfVapor vgDensity [kg/m3]Liquid 1/vfVapor 1/vgEnthalpy [kJ/kg]Liquid HfLatent HfgEntropy [kJ/(kg)(K)]Vapor HgLiquid SfVapor SgTemp [ 426.71.10601.7780196

Freon 410ARefrigerantTable 1. Freon 410A Saturation Properties—Temperature Table (continued)Temp [ C]Pressure [kPa]Liquid pfVapor pgVolume [m3/kg]Liquid vfVapor vgDensity [kg/m3]Liquid 1/vfVapor 1/vgEnthalpy [kJ/kg]Liquid HfLatent HfgEntropy [kJ/(kg)(K)]Vapor HgLiquid SfVapor SgTemp [ 1.6380707

Freon 410ARefrigerantTable 2. Freon 410A Superheated Vapor—Constant Pressure TableV Volume in m3/kgH Enthalpy in kJ/kgS Entropy in kJ/(kg)(K)Saturation Properties in Light BlueAbsolute Pressure [kPa]10.0Temp [ C]20.0–88.31 CVH30.0–78.91 CSV1.0953H386.840.0–72.84 CSV2.0518Temp [ 2.1363–75390.2–68.26 1.0085510.52.4314801.0229515.02.444185

Freon 410ARefrigerantTable 2. Freon 410A Superheated Vapor—Constant Pressure Table (continued)V Volume in m3/kgH Enthalpy in kJ/kgS Entropy in kJ/(kg)(K)Saturation Properties in Light BlueAbsolute Pressure [kPa]50.0Temp [ C]60.0–64.52 CVH70.0–61.34 CSVH80.0–58.56 045401.01.9979VH–56.09 1.97830.3003400.01.9612Temp [ .3766900.5999523.92.40460.5246523.82.389195

Freon 410ARefrigerantTable 2. Freon 410A Superheated Vapor—Constant Pressure Table (continued)V Volume in m3/kgH Enthalpy in kJ/kgS Entropy in kJ/(kg)(K)Saturation Properties in Light BlueAbsolute Pressure [kPa]90.0Temp [ C]100.0–53.84 CVH101.325–51.79 CSVH110.0–51.53 CSVH–49.90 37Temp [ 62.02.167225300.3816466.62.204

Heat capacity at constant pressure in kJ/(kg)( C) C v Heat capacity at constant volume in kJ/(kg)( C) v s Velocity of sound in m/sec The gas constant, R 8.314 J/(mole) (K) for Freon 410A, R 0.11455 kJ/kg·K One atmosphere 101.325 kPa Reference point for enthalpy and entropy: h f 200 kJ/kg at 0 C s f 1 kJ/kg·K at 0 C .