9:02 AM G ¼ → Burk 14:44 89+0 996 QUESTION FIVE A heat pump which is a reversed heat engine takes in heat from a reservoir at 8°C and delivers it to a reservoir at 82°C. The work input to the heat pump is from a reversible heat engine which receives heat from a reservoir at 1100°C and rejects heat to the reservoir at 82°C. If the amount of heat supplied to the reservoir at 82°C is to be 102kJ/s, find the heat to be supplied reservoir at 1100°C. Show neat and well labeled sketches of the system (17.5 marks) from the ● ANSWER Heat to at 1100 ● STEP BY 1 Diagra Given = 'L T₂ = T3 = Q2 =

9:02 AM G ¼ → Burk 14:44 89+0 996 QUESTION FIVE A heat pump which is a reversed heat engine takes in heat from a reservoir at 8°C and delivers it to a reservoir at 82°C. The work input to the heat pump is from a reversible heat engine which receives heat from a reservoir at 1100°C and rejects heat to the reservoir at 82°C. If the amount of heat supplied to the reservoir at 82°C is to be 102kJ/s, find the heat to be supplied reservoir at 1100°C. Show neat and well labeled sketches of the system (17.5 marks) from the ● ANSWER Heat to at 1100 ● STEP BY 1 Diagra Given = 'L T₂ = T3 = Q2 =

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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A new parabolic dish solar concentrator is being developed to supply electricity to a small remote community. The system operates with a Stirling engine connected to two heat reservoirs HR₁ and HR₂ as shown in Fig. Concentrated solar radiation Q˙ₛᵤₙ=200kW maintains HR₁ at constant temperature Tₕᵣ,₁=700℃, and a high performance heat sink device maintains HR₂ at temperature Tₕᵣ,₂=25℃. After some time of operation, an engineer working on the project realizes that the engine power output is performing below design specifications and only provides a power output of 120kW. After inspecting the system, they discover a contact resistance that causes the thermal communication between the two heat reservoirs and the engine to be imperfect in the sense that a finite temperature difference is required to establish heat transfer between each of the heat reservoirs and the engine. Assuming the engine itself is internally reversible, estimate the rate of entropy generation in the engine’s…
A new parabolic dish solar concentrator is being developed to supply electricity to a small remote community. The system operates with a Stirling engine connected to two heat reservoirs HR₁ and HR₂ as shown in Fig. Concentrated solar radiation Q˙ₛᵤₙ=200kW maintains HR₁ at constant temperature Tₕᵣ,₁=700℃, and a high performance heat sink device maintains HR₂ at temperature Tₕᵣ,₂=25℃. After some time of operation, an engineer working on the project realizes that the engine power output is performing below design specifications and only provides a power output of 120kW. After inspecting the system, they discover a contact resistance that causes the thermal communication between the two heat reservoirs and the engine to be imperfect in the sense that a finite temperature difference is required to establish heat transfer between each of the heat reservoirs and the engine. Sketch the cycle on a T-s diagram and include the temperatures of the heat reservoirs in your sketch. Calculate the…
2
Since Lucas is an engineer familiar with thermodynamics. He decided to create his own heat engine at home to avoid paying for electricity. He created a small, makeshift heat engine for trial. The combustion of his fuel. diesel, reaches a temperature of 750°C, while waste heat is disposed to the atmosphere at 50°C. He, then connected a generator and a heat pump to the heat engine to check the amount of power being produced. Assume that the heat pump will be used to warm his room to 25°C, while the outside temperature is at 5°C. Lucas' rooms loses 85,000 kJ/hr of heat. And, 25% of the heat engine's power output goes to the heat pump. How much diesel (in kg) needs to be burned by the heat engine to maintain the temperature in Lucas' room? Assume carnot heat engine and heat pump. If the natural gas has a heating value of 22,000 BTU/lb.
A cyclic heat engine operates between a source and sink that are respectively attemperatures of 1000 0C and 50 0C. Draw the diagram, calculate the efficiency of the heatengine and the rate of heat rejection per kW net output of the engine.
The capacity of a refrigerator is 200 TR when working between -4°C and 220C. Determine the mass of ice produced per day from water at 22°C. Also, find the power required to drive the unit. Assume that the cycle operates on reversed Carnot cycle and latent heat of ice is 336 Krkg.
. 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…
Please I need solutions to this questions
1. A Carnot heat engine absorbs heat at a rate of 10 kJ/s from a source at 500°C and rejects the waste heat to the environment at 25°C. It is proposed that the heat engine will be used to drive a Carnot refrigerator that removes heat from the cooled space at -10°C and rejects it to the same environment at 25°C. i. Determine the minimum rate of heat removal from the cooled space.
Since Lucas is an engineer familiar with thermodynamics. He decided to create his own heat engine at home to avoid paying for electricity. He created a small, makeshift heat engine for trial. The combustion of his fuel, diesel, reaches a temperature of 750°C, while waste heat is disposed to the atmosphere at 50°C.He, then connected a generator and a heat pump to the heat engine to check the amount of power being produced. Assume that the heat pump will be used to warm his room to 25°C, while the outside temperature is at 5°C. Lucas’ rooms loses 85,000 kJ/hr of heat. And, 25% of the heat engine’s power output goes to the heat pump. How much diesel (in kg) needs to be burned by the heat engine to maintain the temperature in Lucas’ room? Assume carnot heat engine and heat pump. If the natural gas has a heating value of 22,000 BTU/lb. *Round off all answers to four decimal places*
B6
Refer the figure shown: A Carnot Heat Engine draws heat from a reservoir at temperature TA and rejects heat TA Te to another reservoir at temperature Tg. TA = 540 K; Tc = 210 K; Carnot W= W. Carnot НЕ Ref. The Carnot Heat Engine drives a Carnot Refrigerator which absorbs heat from reservoir at temperature Tc and rejects heat to reservoir at temperature Tg. QsE Ta Heat supplied to the Carnot Heat Engine is equal to the heat absorbed by Carnot Refrigerator. The temperature Tg is equal to K The efficiency of Carnot Heat Engine is equal to The Coefficient of Performance of Carnot refrigerator is equal to