Repeat problem 10-4-5 with the heat exchanger removed.
Problem 10-4-5
An ideal vapor-compression refrigeration cycle uses R-134a as a working fluid and operates between 0.1 MPa and 1.5 MPa. The refrigerant leaves the condenser at 30oC and the heat exchanger at 10oC. The refrigerant is then throttled to the evaporator pressure. Refrigerant leaves the evaporator as a saturated vapor and goes to the heat exchanger. The mass flow rate (m) is 1 kg/s. A temperature difference of 5oC is maintained for effective heat exchange between the refrigerant and its surroundings at the evaporator and condenser. The atmospheric conditions are 100 kPa and 25oC.
(a) Perform an energy inventory on a rate (kW) basis for the entire cycle complete with an energy flow diagram. Determine
(b) The cooling capacity
(c) Exegetic efficiency
(d) COP of the system.