Chapter 9, Problem 9.65P

It has been suggested that a building could be heated by a refrigeration engine operating in a Carnot cycle. The engine takes heat from the outside at 280 K and delivers heat to the building a 295 K. How much work would have to be done for every kilo joule heat delivered to the   building?

Question-3As seen in the figure, the stable air conditioner keeps the indoor environment at 21oC while the outdoor environment is 32oC. Since the heat transfer rate from the roof and walls to the house is 31,650 kJ/h, is the 2.2 kW power input to the compressor of the air conditioner sufficient? If sufficient, calculate COP, if not, find the theoretical minimum power in kW

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.

A vapour compression refrigerator has a COP of 4 and extracts 10 kJ of heat from the cold reservoir. If this machine is worked as a heat pump, how much heat will it deliver to the environment?

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A refrigeration system operated on an ideal vapor-compression using R-12 with a vaporizing temperature of -10 degrees Celsius and a condensing temperature of 30 degrees Celsius, it requires 15 hp to drive the motor of the compressor. Find the ff: Enthalpies at each point of the cycle in kJ/kg Refrigerating Capacity in TOR • Mass of the Refrigerant in kg/s Percent Quality in the mixture Heat Rejected in kW Coefficient of Performance • Schematic and P-h Diagram

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.

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