Low pressure steam is used as a refrigerant. Find the Refrigerating capacity in Tons of Refrigeration if the steam leaves the condenser at 0.2 kg/s. Then also the COP.

The typical difference in temperature between the cooling tower water supplied to the condenser and the out-door wet-bulb temperature is _____F.

A refrigerator in a meat warehouse must keep a low temperature of -20°C and the outside temperature is 25°C. Ammonia is used as the refrigerant which must remove 10 kW from the cold space. Compute for the flow rate of the ammonia needed assuming a standard vapor compression refrigeration cycle with a condenser at 25°C. Find the enthalpy of the stream exiting the evaporator, condenser, and throttling (expansion) valve.

Steam is generated at 4.1 Mpa and 440 degrees Celsius and the condensing pressure is 105 Kpa.Find the Qa, Qr, Wnet and thermal efficiency of the powerplant.

In a 14 TR ammonia refrigeration plant, the condensing temperature is 250C and evaporating temperature -100C. The refrigerant ammonia is sub-cooled by 5 0C before passing through the throttle valve. The vapor leaving the evaporator is 0.97 dry. Find: 1. Coefficient of performance: and 2. Power required. Use refrigerant table for properties of ammonia at 250C and -100C.

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A small power plant produces 25 kg/s steam at 3 MPa, 600 degrees Celsius in the boiler. It cools the condenser with the ocean water coming in at 12 degrees Celsius and returning at 15 degrees Celsius so the condenser exit is at 45 degrees Celsius. Find the net power output and the required mass flow rate of ocean water.

b. A refrigerating system using Freon-12 has an evaporator saturation temperature of - 25°C and a condenser saturation temperature of 35°C. The vapor is dry saturated at entry to the compressor and has a temperature of 65°C after compression to the condenser pressure. There is no undercooling of the liquid in the condenser. i. Calculate the input power required by the compressor per kW of refrigeration. ii. Calculate the COPRef of the refrigerating system. ii. Show the operating cycle of the refrigerating system on a T-s diagram.

A vapour absorption refrigeration system works with a generator temperature of 87⁰C, absorber temperature of 37⁰C and evaporator temperature of -13⁰C. (a) Obtain the COP of the system. (b) If the evaporator temperature falls to -18⁰C, what should be the generator temperature so that the system operates with the same COP?

Solve using P-h chart with a clear handwriting