A heat pump operating based on the Carnot cycle receives heat from a reservoir at 278K and the heat is delivered to a reservoir at 333K. The heat pump is driven by a reversible heat engine which receives heat from a reservoir at 840°C and releases heat to a reservoir at 333K. The reversible heat engine also drives a machine that absorbs 1800kJ/min. If the heat pump extracts 1020kJ/min from the 278K reservoir, determine a. The rate of heat supply from the 840°C source. b. The rate of heat rejection to the 60°C sink.

A heat pump operating based on the Carnot cycle receives heat from a reservoir at 278K and the heat is delivered to a reservoir at 333K. The heat pump is driven by a reversible heat engine which receives heat from a reservoir at 840°C and releases heat to a reservoir at 333K. The reversible heat engine also drives a machine that absorbs 1800kJ/min. If the heat pump extracts 1020kJ/min from the 278K reservoir, determine a. The rate of heat supply from the 840°C source. b. The rate of heat rejection to the 60°C sink.

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

Chapter45: Domestic Refrigerators And Freezers

Section: Chapter Questions

Problem 12RQ: Refrigerators currently being manufactured in the United States are using______as their refrigerant.

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. Consider three reservoirs that are TH = 473.2 K, TL = 293.2 K and TI = 277.2 K. A Carnot heat engine can be reversed and used as either a heat pump or a refrigerator. In the case of a heat pump the heat flow to the higher temperature reservoir is the desired output and it is used to heat a room or building. In the case of the refrigerator the desired energy flow is the heat in from a region to be cooled. For the heat pump or refrigerator, the work input is provided by electricity. For this information answer the following questions: a) Calculate the Carnot Efficiency of a heat engine that operates between TH and TL. b) A room is maintained at a constant temperature of 20 C and has a heat loss of 20,000 W. Consider this room for a period of 3 hours. The surroundings are at a temperature of TI. In one option the room is heated using resistive heaters that are operated with electricity. b1)Determine the electrical energy input to these heaters. b2)Determine the efficiency of…
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Consider three reservoirs that are TH = 473.2 K, TL = 293.2 K and TI = 277.2 K. A Carnot heat engine can be reversed and used as either a heat pump or a refrigerator. In the case of a heat pump the heat flow to the higher temperature reservoir is the desired output and it is used to heat a room or building. In the case of the refrigerator the desired energy flow is the heat in from a region to be cooled. For the heat pump or refrigerator, the work input is provided by electricity. Efficiency of the Carnot engine is 38%. For this information answer the following questions: 1) A room is maintained at a constant temperature of 20 C and has a heat loss of 20,000 W. Consider this room for a period of 3 hours. The surroundings are at a temperature of TI. In one option the room is heated using resistive heaters that are operated with electricity. For the same conditions described in part 1 above, consider using a Carnot heat pump to supply the heat to the room. The low temperature…
Consider three reservoirs that are TH = 473.2 K, TL = 293.2 K and TI = 277.2 K. A Carnot heat engine can be reversed and used as either a heat pump or a refrigerator. In the case of a heat pump the heat flow to the higher temperature reservoir is the desired output and it is used to heat a room or building. In the case of the refrigerator the desired energy flow is the heat in from a region to be cooled. For the heat pump or refrigerator, the work input is provided by electricity. Efficiency of the Carnot engine is 38%. For this information answer the following questions: A room is maintained at a constant temperature of 20 C and has a heat loss of 20,000 W. Consider this room for a period of 3 hours. The surroundings are at a temperature of TI. In one option the room is heated using resistive heaters that are operated with electricity. a)Determine the electrical energy input to these heaters. b)Determine the efficiency of this heating system. c)Determine the entropy production…
Consider three reservoirs that are TH = 473.2 K, TL = 293.2 K and TI = 277.2 K. A Carnot heat engine can be reversed and used as either a heat pump or a refrigerator. In the case of a heat pump the heat flow to the higher temperature reservoir is the desired output and it is used to heat a room or building. In the case of the refrigerator the desired energy flow is the heat in from a region to be cooled. For the heat pump or refrigerator, the work input is provided by electricity. For this information answer the following question: a) Calculate the Carnot Efficiency of a heat engine that operates between TH and TL.
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A reversible heat engine drives the heat pump and takes in heat from a thermal energy reservoir at 1113K and dumps the heat to a reservoir at 333K. The heat pump works on a Carnot cycle and absorbs heat from the thermal energy reservoir at 278K and rejects the heat to a reservoir at 333K.The heat engine is also being used to operate a machine which takes in 30 kW. If the rate of extraction of the heat pump from its initial reservoir is at 17 kJ/s, calculate the ff:- What is the rate of extraction of heat from the heat engine? - What is the rate of the rejection of heat from the 333K reservoir?
Consider three reservoirs that are TH = 473.2 K, TL = 293.2 K and TI = 277.2 K. A Carnot heat engine can be reversed and used as either a heat pump or a refrigerator. In the case of a heat pump the heat flow to the higher temperature reservoir is the desired output and it is used to heat a room or building. In the case of the refrigerator the desired energy flow is the heat in from a region to be cooled. For the heat pump or refrigerator, the work input is provided by electricity. A region is to be cooled to a temperature of 277 K using a heat powered Carnot refrigerator. The heat that must be removed is 15,000 W. The heat rejected from the refrigerator is to a heat reservoir at TL. The heat input to this device is from a reservoir at TH. This is a Carnot model of an absorber refrigeration system. In it a Carnot heat engine operates between reservoirs at TH and TL. The work output from this Carnot heat engine is the input to a Carnot refrigerator that operates between TI and…
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