A vapor-compression refrigeration system operates on a cycle with evaporation temperature of 0°C and a condensation temperature of 26 °C. The refrigerant used is tetrafluoroethane (Table 9.1, Fig. F.2). The compressor efficiency is 0.79 and the rate of refrigeration is 600 kW. Determine the circulation rate of the refrigerant, the heat- transfer rate in the condenser, the power requirement, the coefficient of performance of the cycle, and the coefficient of performance of a Carnot refrigeration cycle operating between the same temperature levels.

A vapor-compression refrigeration system operates on a cycle with evaporation temperature of 0°C and a condensation temperature of 26 °C. The refrigerant used is tetrafluoroethane (Table 9.1, Fig. F.2). The compressor efficiency is 0.79 and the rate of refrigeration is 600 kW. Determine the circulation rate of the refrigerant, the heat- transfer rate in the condenser, the power requirement, the coefficient of performance of the cycle, and the coefficient of performance of a Carnot refrigeration cycle operating between the same temperature levels.

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter22: Condensers

Section: Chapter Questions

Problem 7RQ: When a standard-efficiency air-cooled condenser is used, the condensing refrigerant will normally be...

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A vapor compression refrigeration system operates on the cycle shown below (from Smith, Van Ness, and Abbott text). The refrigerant is tetrafluoroethane (P-H diagram from Smith, Van Ness, and Abbott text on next page). Determine the circulation rate of the refrigerant (in kg/s), the heat transfer rate in the condenser (in kW), the actual power requirement from compressor (in kW), the overall coefficient of performance of the cycle, and the coefficient of performance of a Carnot refrigeration cycle operating between the same temperature levels. Use the following operating data: Evaporation T = -10°C; Condensation T = 26°C; Compressor Efficiency Factor = 0.8; Refrigeration rate = 500 kJ/s.
2.3 A vapour compression refrigeration cycle operates between the condensation temperature of 20°C and evaporator temperature of –10°C with carbon dioxide as refrigerant. Temperature after isentropic compression is 40°C and condensate leaves at 10°C before being passed through expansion valve. Determine 2.3.1 COP of system and 2.3.2 mass flow rate of CO2 required to get refrigeration effect of 2 kW.