thermodynamics work and heat transfer Author(S) G.F.C. and Mayhew Y.R., 1995, Thermodynamic and Transport Properties of Fluids. Recognizing the artifice ways to acquire this ebook engineering thermodynamics. At a temperature of –20☌, the saturation pressure, p s is 1.3272 bar. all liquid and no sub-cooling) Solution (a) Refer to Rogers and Mayhew’s tables of Thermodynamic and Transport Properties of Fluids, in which there is a page of data for Tetrafluoroethane – CH 2 F-CF 3. all vapour, with no superheat) and enters at saturated liquid condition (i.e. R., Engineering Thermodynamics: Work and Heat Transfer. Engineering Thermodynamics: Work and Heat Transfer de Rogers, G. (a) What pressure is required in a freezer compartment evaporator coil using refrigerant R134a if the temperature is to be maintained at – 20☌ (b) What is the enthalpy and entropy when the R134a is: (i) all liquid (ii) all vapour (iii) What does the change in entropy between the two states tell you (c) Assuming a mass flow rate of R134a of 20g/s, and making use of the SFEE, what heat transfer rate occurs in the evaporator if the refrigerant leaves at saturated gas condition (i.e. MECH1002: Engineering Thermodynamics University College London. An Introduction to Mechanical Engineering Part 2 ! Thermodynamics worked examples Refrigeration 1.