Another alternative refrigerant (see preceding problem) is 1,1,1,2- tetrafluoroethane

Chapter 2, Problem 2.47

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Another alternative refrigerant (see preceding problem) is 1,1,1,2- tetrafluoroethane (refrigerant HFC-134a). Tillner-Roth and Baehr published a compendium of thermophysical properties of this substance (R. Tillner- Roth and H.D. Baehr, J. Phys. Chem. Ref. Data 23, 657 (1994)), from which properties such as the JouleThomson coefficient can be computed. (a) Compute at 0.100 MPa and 300 K from the following data (all referring to 300 K): p/MPa 0.080 0.100 0.12 Specific enthalpy/(kJ kg1) 426.48 426.12 425.76 (The specific constant-pressure heat capacity is 0.7649 kJ K1 kg1.) (b) Compute at 1.00 MPa and 350 K from the following data (all referring to 350 K): p/MPa 0.80 1.00 1.2 Specific enthalpy/(kJ kg1) 461.93 459.12 456.15 (The specific constant-pressure heat capacity is 1.0392 kJ K1 kg1.)

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