A refrigeration system with a capacity of 15 tons of refrigeration, operates at 150 kPa in the evaporator, while in the condenser it is 1590 kPa. If refrigerant R-717 is saturated, calculate the theoretical power required to operate the compressor. Compressor Power = kW.

A heat pump operates between  36 degrees fahrenheit and 120 degrees fahrenheit . If heat added from the low temp. region is 500 BTU/min. Find the horsepower needed for the compressor power.

In a R-134a based refrigeration system the cycle operates in the temperature range of 40°c and - 20°c. Find COP of the system if the vapor is dry and saturated .hile entering the compressor. Assume mass flow rate of refrigerant is 1 kg/s.

Q2/ In simple refrigeration system uses R134a, the evaporator pressure is 0.25 MPa and the condenser pressure is 1. MPa. The evaporator load is 25 TR. Determine the required work to operate the compressor motor in (a) kW, (b) hp. What is the displacement volume of the compressor if the volumetric efficiency is 80%

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Find the thermal efficiency of the system in percentage to 2.d.p.

What are the intercooler pressure in a three stage compressor with suction pressure of 101.325KPa and final pressure of 2240KPa?

iii) the exit area of the nozzle. Take Cp = 1.005 kJ/kg-K and R=287 J/kg-K Q.B3. A heat engine operates between two reservoirs at 400°C and 30°C. Half the power produced by the heat engine is used to drive a Carnot heat pump that removes heat from the cold surroundings at 2°C and transfers it to a house maintained at 27°C. The heat engine is absorbing heat at a rate of 5 kJ/s. i) Draw the complete schematic of the device ii) Determine the thermal efficiency of the heat engine iii) Determine the coefficient of performance of the heat pump iv) Determine the rate of heat loss from the house. v) Determine the minimum rate of heat extraction by the heat pump, and vi) the total rate of heat rejection.