In a refrigeration system, R134a leaves the condenser to enter the expansion valve at 0.8 MPa subcooled by 3.31°C. The refrigerant leaves the evaporator at 0.14 MPa superheated by 3.77°C.

Please answer the following. a. Represent the devices present in the refrigeration system and include their name along with the data given in the problem. Hint: to verify your answer, refer to figure 6-19 of your textbook. b. On a T-s diagram represent the process for the expansion valve and evaporator. Include the isobars with their values and the temperatures. Assume that the pressure drop in the evaporator is negligible. Label as state (3) the exit from the condenser, state (4) the inlet to the evaporator and state (1) the exit from the evaporator. C.Determine the enthalpy and entropy change per unit mass in the expansion valve, in kJ/kg. d. Determine the enthalpy and entropy change per unit mass in the evaporator, in kl/kg.