DuPont Suva. DuPont. Thermodynamic Properties of. Refrigerant (R-410A) Technical Information. refrigerants T-410A ENG

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1 Technical Information T-410A ENG DuPont Suva refrigerants Thermodynamic Properties of DuPont Suva 410A Refrigerant (R-410A) The DuPont Oval Logo, The miracles of science, and Suva, are trademarks or registered trademarks of E.I. du Pont de Nemours and Company.

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3 Thermodynamic Properties of DuPont Suva 410A Refrigerant English (I/P) Units New tables of the thermodynamic properties of DuPont Suva 410A refrigerant [ASHRAE designation: R-410A (50/50)], have been developed and are presented here. These tables are based on extensive experimental measurements. Equations have been developed, based on the Martin-Hou equation of state, which represent the data with accuracy and consistency throughout the entire range of temperature, pressure, and density. Vapor enthalpy and entropy are calculated from the standard Martin-Hou equations. Additional equations have been developed for the calculation of saturated liquid enthalpy, latent enthalpy, and saturated liquid entropy, and are presented here. Physical Properties Chemical Formula CH 2 F 2 /CHF 2 CF 3 (50/50% by weight) Molecular Weight Boiling Point at One Atmosphere ( C) Critical Temperature (72.13 C) R ( K) Critical Pressure psia ( kpa [abs]) Critical Density lb/ft 3 ( kg/m 3 ) Critical Volume ft 3 /lb ( m 3 /kg) Units and Factors t = temperature in T = temperature in R = P = pressure in lb/in 2 absolute (psia) v f = volume of saturated liquid in ft 3 /lb v g = volume of saturated vapor in ft 3 /lb V = volume of superheated vapor in ft 3 /lb d f = 1/v f = density of saturated liquid in lb/ft 3 d g = 1/v g = density of saturated vapor in lb/ft 3 h f = enthalpy of saturated liquid in Btu/lb h fg = enthalpy of vaporization in Btu/lb h g = enthalpy of saturated vapor in Btu/lb H = enthalpy of superheated vapor in Btu/lb s f = entropy of saturated liquid in Btu/(lb) ( R) s g = entropy of saturated vapor in Btu/(lb) ( R) S = entropy of superheated vapor in Btu/(lb) ( R) C p = heat capacity at constant pressure in Btu/(lb) () C v = heat capacity at constant volume in Btu/(lb) () v s = velocity of sound in ft/sec The gas constant, R = (psia) (ft 3 )/( R) (lb-mole) for Suva 410A, R = (psia) (ft 3 )/lb R One atmosphere = psia Conversion factor from Work Units to Heat Units: J = Btu/lb = (psia ft 3 )/lb J Reference point for enthalpy and entropy: h f = 0.0 Btu/lb at 40 s f = 0.0 Btu/lb R at 40 Equations 1. Conversion Factors I/P Units to SI Units Properties listed in the following thermodynamic tables in I/P units can be converted to SI units using the conversion factors shown below. Please note that in converting enthalpy and entropy from I/P to SI units, a change in reference states must be included (from H = 0 and S = 0 at 40 for I/P units to H = 200 and S = 1 at 0 C for SI units). In the conversion equation below, H (ref) and S (ref) are the saturated liquid enthalpy and entropy at 40 C. For Suva 410A, H (ref) = kj/ kg and S (ref) = kj/kg K. P (kpa) = P (psia) T ( C) = (T[] 32) 1.8 D (kg/m 3 ) = D (lb/ft 3 ) V (m 3 /kg) = V (ft 3 /lb) H (kj/kg) = [H (Btu/lb) ] + H (ref) S (kj/kg) = [S (Btu/lb R) ] + S (ref) C p (kj/kg K) = C p (Btu/lb ) C v (kj/kg K) = C v (Btu/lb ) v s (m/sec) = v s (ft/sec) Martin-Hou Equation of State Coefficients for the Martin-Hou equation of state are presented below: 5 P = RT/(V b) + Σ (A i + B i T + C i exp [ kt/t c ])/(V b) i i=2 1

4 For SI units T and T c are in K = C , V is in m 3 /kg, and P is in kpa (abs). R = kj/kg K for Suva 410A b, A i, B i, C i, and k are constants: A 2 = E 01 A 4 = E 07 B 2 = E 04 B 4 = E+00 C 2 = E+00 C 4 = E+00 A 3 = E 04 A 5 = E 10 B 3 = E 08 B 5 = E 12 C 3 = E 02 C 5 = E 07 b = E 04 k = E+00 X and Y are constants used in the vapor enthalpy and entropy equations for the Martin-Hou equation of state: X = E+02 Y = E 01 For I/P units T and T c are in R = , V is in ft 3 /lb, and P is in psia. R = (psia) (ft 3 )/lb R for Suva 410A b, A i, B i, C i, and k are constants: A 2 = E+00 A 4 = E 03 B 2 = E 03 B 4 = E+00 C 2 = E+02 C 4 = E+00 A 3 = E 01 A 5 = E 05 B 3 = E 06 B 5 = E 07 C 3 = E+00 C 5 = E 02 b = E 03 k = E+00 X and Y are constants used in the vapor enthalpy and entropy equations for the Martin-Hou equation of state: X = E+01 Y = E 02 Ideal Gas Heat Capacity (at constant pressure): C o p = a + bt + ct 2 + dt 3 Ideal Gas Heat Capacity (at constant volume): C o v = C o p R For SI units C o p and C o v = kj/kg K R = kj/kg K for Suva 410A T is in K = C a, b, c, d, are constants: a = E 01 c = E 07 b = E 03 d = E 11 For I/P units C o p and C o v = Btu/lb R R = Btu/lb R for Suva 410A T is in R = a, b, c, d, are constants: a = E 02 c = E 08 b = E 04 d = E Liquid Enthalpy, Latent Enthalpy and Liquid Entropy Equations Saturated Liquid Enthalpy: h f = A + B X + C (X) 2 + D (X) 3 + E (X) 4 + F (X) 5 where X = (1 T r ) 1/3 X o, and T r = T/T c Latent Enthalpy: h fg = h g h f Saturated Liquid Entropy: s f = s g ([h g h f ]/T) For SI units h f, h g, and h fg are in kj/kg s f and s g are in kj/(kg) (K) T and T c are in K = C A, B, C, D, E, F, and X o are constants: A = E+02 D = E+02 B = E+02 E = E+03 C = E+02 F = E+03 X o = E 01 2

5 For I/P units h f, h g, and h fg are in Btu/lb s f and s g are in Btu/(lb) ( R) T and T c are in R = A, B, C, D, E, F, and X o are constants: A = E+01 D = E+02 B = E+02 E = E+02 C = E+02 F = E+02 X o = E Vapor Pressure log n (P sat /P c ) = 1/T r (A + B X + C X 2 + D X 3 + E X 4 + F X 5 ) where X = (1 T r ) X o, and T r = T/T c A, B, C, D, E, F, and X o are constants: Constants for vapor pressure of saturated liquid (bubble point), p f : A = E+00 D = E+00 B = E+00 E = E+00 C = E 01 F = E+00 X o = E 01 Constants for vapor pressure of saturated vapor (dew point), p g : A = E+00 D = E+00 B = E+00 E = E+00 C = E 01 F = E+00 X o = E 01 Because both pressure and temperature appear in the reduced form in the equation, the same constants can be used for either SI or I/P units. For SI units T and T c are in K = C P and P c are in kpa (abs) For I/P units T and T c are in R = P and P c are in psia 5. Density of the Saturated Liquid d f /Dc = A f + B f (1 T r ) (1/3) + C f (1 T r ) (2/3) + D f (1 T r ) + E f (1 T r ) (4/3) A f, B f, C f, D f, E f are constants: A f = E+00 D f = E+00 B f = E+00 E f = E 01 C f = E 01 Because both density and temperature appear in the reduced form in the equation, the same constants can be used for either SI or I/P units. For SI units T r and T/T c, both in K = C d f and D c are in kg/m 3 For I/P units T r and T/T c, both in R = d f and D c are in lb/ft 3 3

6 p f PRESSURE psia p g Table 1 Suva 410A Saturation Properties Temperature Table v f VOLUME ft 3 /lb v g DENSITY lb/ft 3 1/v f 1/v g h f ENTHALPY Btu/lb LATENT h fg h g s f ENTROPY Btu/(lb)( R) s g 4

7 p f PRESSURE psia p g Table 1 (continued) Suva 410A Saturation Properties Temperature Table v f VOLUME ft 3 /lb v g DENSITY lb/ft 3 1/v f 1/v g h f ENTHALPY Btu/lb LATENT h fg sfs f h g ENTROPY Btu/(lb)( R) s g 5

8 Table 1 (continued) Suva 410A Saturation Properties Temperature Table p f PRESSURE psia p g v f VOLUME ft 3 /lb v g DENSITY lb/ft 3 1/v f 1/v g h f ENTHALPY Btu/lb LATENT h fg h g s f ENTROPY Btu/(lb)( R) s g

9 Table 1 (continued) Suva 410A Saturation Properties Temperature Table p f PRESSURE psia p g v f VOLUME ft 3 /lb v g DENSITY lb/ft 3 1/v f 1/v g h f ENTHALPY Btu/lb LATENT h fg h g s f ENTROPY Btu/(lb)( R) s g

10 p f PRESSURE psia p g Table 1 (continued) Suva 410A Saturation Properties Temperature Table v f VOLUME ft 3 /lb v g DENSITY lb/ft 3 1/v f 1/v g h f ENTHALPY Btu/lb LATENT h fg h g s f ENTROPY Btu/(lb)( R) s g 8

11 Table 1 (continued) Suva 410A Saturation Properties Temperature Table p f PRESSURE psia p g v f VOLUME ft 3 /lb v g DENSITY lb/ft 3 1/v f 1/v g h f ENTHALPY Btu/lb LATENT h fg h g s f ENTROPY Btu/(lb)( R) s g

12 Table 2 Suva 410A Superheated Vapor Constant Pressure Tables V = Volume in ft 3 /lb H = Enthalpy in Btu/lb S = Entropy in Btu/(lb) ( R) (Saturated Vapor Properties in parentheses) ABSOLUTE PRESSURE, psia ( ) ( ) ( ) ( ) V H S V H S V H S V H S ( ) (102.2) (0.3257) ( ) (104.4) (0.3135) ( ) (105.8) (0.3065) ( ) (106.8) (0.3017) ( 95.19) ( 89.86) ( 85.21) ( 81.08) V H S V H S V H S V H S ( ) (107.6) (0.2980) (8.8803) (108.3) (0.2951) (7.6853) (108.9) (0.2926) (6.7804) (109.5) (0.2904)

13 Table 2 (continued) Suva 410A Superheated Vapor Constant Pressure Tables V = Volume in ft 3 /lb H = Enthalpy in Btu/lb S = Entropy in Btu/(lb) ( R) (Saturated Vapor Properties in parentheses) ABSOLUTE PRESSURE, psia ( 77.33) ( 73.91) ( 70.75) ( 67.81) V H S V H S V H S V H S (6.0708) (109.9) (0.2886) (5.4988) (110.4) (0.2869) (5.0277) (110.8) (0.2854) (4.6327) (111.1) (0.2840) ( 65.06) ( 62.48) ( 60.76) ( 60.03) V H S V H S V H S V H S (4.2967) (111.5) (0.2828) (4.0070) (111.8) (0.2817) (3.8280) (112.0) (0.2809) (3.7548) (112.1) (0.2806)

14 Table 2 (continued) Suva 410A Superheated Vapor Constant Pressure Tables V = Volume in ft 3 /lb H = Enthalpy in Btu/lb S = Entropy in Btu/(lb) ( R) (Saturated Vapor Properties in parentheses) ABSOLUTE PRESSURE, psia ( 57.71) ( 55.50) ( 53.40) ( 51.38) V H S V H S V H S V H S (3.5331) (112.4) (0.2796) (3.3367) (112.6) (0.2787) (3.1614) (112.9) (0.2778) (3.0039) (113.1) (0.2770) ( 49.45) ( 47.59) ( 45.80) ( 44.07) V H S V H S V H S V H S (2.8617) (113.3) (0.2762) (2.7326) (113.5) (0.2755) (2.6148) (113.8) (0.2748) (2.5070) (114.0) (0.2741) A

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