Thermophysical properties of 1,1,1,2-tetrafluoroethane (refrigerant HFC-134a) has been published (R. Tillner-Roth and H.D. Baehr, J. Phys. Chem. Ref. Data 23, 657 (1994)) from which properties such as the Joule-Thomson coefficient u can be computed. (a) Compute u at 0.100 MPa and 300 K from the following data (all referring to 300 K): (The specific constant-pressure heat capacity is 0.7649 kJ K-' kg'.) P/MPa 0.08 0.1 0.12 | Specific enthalpy/(kJ kg¯!) 426.48 426.12 425.76 (b) Compute u at 25 MPa and 350 K from the following data (all referring to 350 K): (The specific constant-pressure heat capacity is 1.3803 kJ K-' kg'.) P/MPa 20 25 30 Specific enthalpy/(kJ kg¯l) | 308.70 309.24 310.13

Thermophysical properties of 1,1,1,2-tetrafluoroethane (refrigerant HFC-134a) has been published (R. Tillner-Roth and H.D. Baehr, J. Phys. Chem. Ref. Data 23, 657 (1994)) from which properties such as the Joule-Thomson coefficient u can be computed. (a) Compute u at 0.100 MPa and 300 K from the following data (all referring to 300 K): (The specific constant-pressure heat capacity is 0.7649 kJ K-' kg'.) P/MPa 0.08 0.1 0.12 | Specific enthalpy/(kJ kg¯!) 426.48 426.12 425.76 (b) Compute u at 25 MPa and 350 K from the following data (all referring to 350 K): (The specific constant-pressure heat capacity is 1.3803 kJ K-' kg'.) P/MPa 20 25 30 Specific enthalpy/(kJ kg¯l) | 308.70 309.24 310.13

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter16: Thermodynamics: Directionality Of Chemical Reactions

Section: Chapter Questions

Problem 123QRT

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Thermophysical properties of 1,1,1,2-tetrafluoroethane (refrigerant HFC-134a) has been published
(R. Tillner-Roth and H.D. Baehr, J. Phys. Chem. Ref. Data 23, 657 (1994)) from which properties
such as the Joule-Thomson coefficient u can be computed.
(a) Compute u at 0.100 MPa and 300 K from the following data (all referring to 300 K):
(The specific constant-pressure heat capacity is 0.7649 kJ K' kg'.)
P/MPa
0.08
0.1
0.12
Specific enthalpy/(kJ kg¯')
426.48
426.12
425.76
(b) Compute u at 25 MPa and 350 K from the following data (all referring to 350 K):
(The specific constant-pressure heat capacity is 1.3803 kJ K' kg'.)
P/MPa
20
25
30
Specific enthalpy/(kJ kg¯!)
308.70
309
310.13

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