A household refrigerator operates with cold- and hot-temperature reservoirs of
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Introduction to Heat Transfer
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- Geothermal heat pumps, or water-source heat pumps, are classified as either _____loop or _____loop systems.arrow_forwardRefrigerators currently being manufactured in the United States are using______as their refrigerant.arrow_forward:(a) A four cylinder, single acting R-12 compressor 35 cm x 40 cm runs at 1000 r.p.m. The compressor clearance factor is 0.04 and the law of compression pV1.1=C. the operating pressures for the vapour compression refrigeration system are: 8.47 bar (350C) and 1.004bar (-300C). The refrigerant temperatures are: entering the compressor -200C, leaving the compressor 500C; entering the condenser 450C, leaving the condenser 250C, entering the expansion valve 300C and leaving the evaporator dry saturated. Assuming that heat removed in the compressor is 26 kJ/sec. calculate: Mass of condensing cooling water assuming the rise in temperature to be 100 Tabulate energy balance for 1 kg of refrigerantarrow_forward
- A 55 kW refrigeration load is to be carried by an air refrigeration system with a discharge pressure of 1370 kPa and a refrigerator pressure of 345 kPa. Compression and expansion processes are polytropic with n-1.37. The pressure at the start of the expansion is 1344 kPa and the temperature is 32°C. Air temperature leaving the refrigerator is 0°C and entering the compressor is 5°C. Clearance for both compressor and expander is 5%. Determine the (b)The net work loadarrow_forwardA typical 200-m2 house can be cooled adequately by a 3.5-ton air conditioner whose COP is 4.0. Determine the rate of heat gain of the house when the air conditioner is running continuously to maintain a constant temperature in the house.arrow_forwardIn a household refrigerator, the condenser is vertically mounted at the outer back of the unit, the freezer (evaporator) on the topmost compartment, and the vegetable compartment at the very bottom. Explain why?arrow_forward
- A four cylinder, single acting R-12 compressor 35 cm x 40 cm runs at 1000 r.p.m. The compressor clearance factor is 0.04 and the law of compression pV1.1=C. the operating pressures for the vapour compression refrigeration system are: 8.47 bar (350C) and 1.004bar (-300C). The refrigerant temperatures are: entering the compressor -200C, leaving the compressor 500C; entering the condenser 450C, leaving the condenser 250C, entering the expansion valve 300C and leaving the evaporator dry saturated. Assuming that heat removed in the compressor is 26 kJ/sec. calculate: The refrigerating capacity, The compressor power COP, Mass of condensing cooling water assuming the rise in temperature to be 100 Tabulate energy balance for 1 kg of refrigerantarrow_forwardHow to express the coefficient of performance of a standard refrigerator in terms of the enthalpies of the fluid ?arrow_forwardThe condenser of a room air conditioner is designed to reject heat at a rate of 15,000 kJ/h from refrigerant-134a as the refrigerant is condensed at a temperature of 40°C. Air (cp = 1005 J/kg·K) flows across the finned condenser coils, entering at 25°C and leaving at 35°C. If the overall heat transfer coefficient based on the refrigerant side is 150 W/ m2·K, determine the heat transfer area on the refrigerant side.arrow_forward
- A 55 kW refrigeration load is to be carried by an air refrigeration system with a discharge pressure of 1370 kPa and a refrigerator pressure of 345 kPa. Compression and expansion processes are polytropic with n-1.37. The pressure at the start of the expansion is 1344 kPa and the temperature is 32°C. Air temperature leaving the refrigerator is 0°C and entering the compressor is 5°C. Clearance for both compressor and expander is 5%. Determine the COP.arrow_forwardA commercial refrigerator using R-134a as a refrigerant is used to keep the cooled environment at -35 C. The refrigerator releases the waste heat to the cooling water that enters the condenser at 18 C at 0.25 kg / s and leaves the condenser at 26 C. The refrigerant enters the condenser at a pressure of 1.2 MPa and a temperature of 50 ° C, and leaves the condenser at the same pressure, supercooled at 5 ° C. Since the compressor consumes 3.3 kW of power, a) Mass flow rate of the refrigerant, b) Cooling load and COP value c) Calculate the minimum power consumed by the compressor for the same cooling load.arrow_forwardSubject : Thermofluid A well-sealed house left alone during the midday heat was found to be at 35oC. He turns on the air conditioner, which cools the entire house to 24oC in 30 min. If the COP of the air-conditioning system is 2.6, determine the power drawn by the air conditioner. An estimated of 750 kg of air is within the house for which cv = 0.72 kJ/kg·oC and cp = 1.0 kJ/kg·oC.arrow_forward
- Principles of Heat Transfer (Activate Learning wi...Mechanical EngineeringISBN:9781305387102Author:Kreith, Frank; Manglik, Raj M.Publisher:Cengage LearningRefrigeration and Air Conditioning Technology (Mi...Mechanical EngineeringISBN:9781305578296Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill JohnsonPublisher:Cengage Learning