Simple Vapour Compression Cycle 1) A simple vapour compression system using R12 as a refrigerant. The refrigerant enters the compressor as dry saturated vapour at -20°C, and it is compressed...

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Extracted text: Simple Vapour Compression Cycle 1) A simple vapour compression system using R12 as a refrigerant. The refrigerant enters the compressor as dry saturated vapour at -20°C, and it is compressed isentropically to the condenser pressure corresponding to its temperature 35°C. Show the cycle on the p-h diagram and find: (a) the temperature and enthalpy at the end of compression. (b) the work of compression per unit mass flow rate of refrigerant. 2) A deep freezer operates between the temperature limits -20°C and 35°C and has a refrigerating capacity of 0.8 TR with R12 refrigerant. Calculate the compressor work assuming isentropic compression and refrigerant inlet to the compressor being dry saturated vapour. 3) A R134a system is working at evaporating temperature of -10°C and the condensing temperature of 40°C. Assuming that the system works as a simple vapour compression cycle, draw the cycle on the p-h diagram, and find the following: (a) the refrigerating effect per kg. (b) the mass flow rate of refrigerant required to be circulated (in kg/s) to get 1 kW of refrigeration. (c ) the mass of refrigerant circulated per second for a 10 kW refrigeration unit. 4) A simple vapour compression system keeping the evaporator temperature of 8°C and condensing temperature of 35°C, the system using R22 and its capacity of 5 TR. Show the cycle on the p-h chart and determine the following: (a) the mass flow rate of the refrigerant. (b) Volume flow rate handled by the compressor. (c ) power required by the compressor and power requirement of the compressor per ton of refrigeration. (d) heat rejected in the condenser. (e ) COP of the system, and the corresponding Carnot COP. 5) A saturated liquid refrigerant R22 at the condenser pressure corresponding to a saturation of 35°C is through a capillary tube to an evaporator pressure corresponding to a