During winter, a mechanical heat pump is turned on to supply heat to a house, which is maintained at 18°C. The wall of this house is not perfectly insulated and estimated to have heat loss at a rate of 140,000 kJ/h. The house has electrical appliances that are always turn on, and generate heat at a rate of 27,000 kJ/h. Assume that the mechanical heat pump is reversible and the outdoor temperature is 2°C. List the necessary assumption, sketch the appropriate schematic to visualize the process and calculate the coefficient of performance (COP) for this mechanical heat pump.

During winter, a mechanical heat pump is turned on to supply heat to a house, which is maintained at 18°C. The wall of this house is not perfectly insulated and estimated to have heat loss at a rate of 140,000 kJ/h. The house has electrical appliances that are always turn on, and generate heat at a rate of 27,000 kJ/h. Assume that the mechanical heat pump is reversible and the outdoor temperature is 2°C. List the necessary assumption, sketch the appropriate schematic to visualize the process and calculate the coefficient of performance (COP) for this mechanical heat pump.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Related questions

Q: A household freezer opera a rate of 2 kW to maintain power input required to o

A: Calculated the smallest power input(KW) required to operate the freezer.

Q: A Carnot heat engine receives heat from a reservoir at 900°C at a rate of 800 kJ/min and rejects the…

Q: A heat pump is used to maintain a house at T,°C_by House extracting heat from the outside air on a…

Q: An air conditioner with refrigerant-134a as the refrigerant is used to keep a large space at 20°C by…

A: Hello. Since your question has multiple sub-parts, we will solve first three sub-parts for you. If…

Q: An engineer is proposing a refrigeration system. The refrigeration system is claimed to remove 595…

A: GIVEN DATA HIGHER TEMPERATURE T =98'F CONVERT IN KELVIN = 309.816K LOWER TEMPERATURE T = 38'F…

Q: Determine the expressions for the thermal efficiencies and coefficients of performance for…

Q: A CARNOT heat engine receives heat from a reservoir at 900°C at a rate of 800kJ/min and rejects the…

A: To Find:- a) The maximum rate of heat removal from the refrigerated space b) The total rate of heat…

Q: Calculate the net work output of a heat engine following path ABCDA in the figure below.

A: The net work output of the heat engine is the area enclosed in the cycle ABCDA on P-V diagram.…

Q: . Dr. Eismann placed a refrigerator in his office. Since then he didn’t touch the refrigerator. The…

A: Draw the temperature-entropy diagram i.e. the T-s diagram for the cycle showing the ideal…

Q: scientist claims to have developed a heat engine with 70% thermal efficiency when operating with…

Concept explainers

Mechanisms of heat transfer

Heat transfer is an essential discipline in thermal engineering that deals with the transfer, conversion, usability, and creation of heat or thermal energy. Transfer of heat occurs through various mechanisms like conduction, convection, radiation, and change of phases. All these mechanisms have distinct characteristics, but these mechanisms can simultaneously occur in an identical system.

Question

During winter, a mechanical heat pump is turned on to supply heat to a house,
which is maintained at 18°C. The wall of this house is not perfectly insulated and
estimated to have heat loss at a rate of 140,000 kJ/h. The house has electrical
appliances that are always turn on, and generate heat at a rate of 27,000 kJ/h.
Assume that the mechanical heat pump is reversible and the outdoor temperature
is 2°C. List the necessary assumption, sketch the appropriate schematic to
visualize the process and calculate the coefficient of performance (COP) for this
mechanical heat pump.

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

SEE SOLUTION Check out a sample Q&A here

Step 1 Given data

VIEW

Step 2

VIEW

Step by step

Solved in 2 steps with 1 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.

Similar questions

A solar energy based heat engine which recieves 90kJ of heat at 900C and rejects 70kJ of heat to the ambient at 200C is to be designed. Determine the thermal efficiency of the heat engine.
The power required to drive the compressor in a Carnot refrigerator is 62 hp. It operates between -6°C and 45°C. Determine the coefficient of performance. Final answer must be in 3 decimal places.
A household refrigerator that has a power input of 450 W and a COP of 1.55 is to cool five large watermelons, 10 kg each, to 8°C. If the watermelons are initially at 28°C, determine how long it will take for the refrigerator to cool them. The watermelons can be treated as water whose specific heat is 4.2 kJ/kg-°C. Is your answer realistic or optimistic? The time taken for the refrigerator to cool the watermelons is [6222.22] min and the answer is optimistic Drev 3 of 9 # Next Next >
Quiz-ch5 A Carnot heat engine receives heat from a reservoir at 1200°C at a rate of 800 kJ/min and rejects the waste heat to the ambient air at 32°C. The entire work output of the heat engine is used to drive a refrigerator that removes heat from the refrigerated space at -7°C and transfers it to the same ambient air at 32°C. Determine (a) the maximum thermal efficiency of the heat engine, (b) the maximum power output of the heat engine (kJ/min), (c) the maximum COP of the refrigerator, (d) the maximum rate of heat removal from the refrigerated space (kJ/min). 1200 'C -7 °C 1000 KJ/min (HE) 32 °C
Between 300K and 600K is the operating temperature of a pair of heat pumps connected in series. The efficiency of the second heat pump is three times that of the first. Find the input work for the first and second heat pumps if the second heat pump absorbs 20kW of heat and the heat release in the first heat pump is the same.
A refrigerator that has a power (electric) input of 450W and a COP of 2.5 is to cool five large watermelons,10 kg each, to 8°C. If the watermelons are initially at 20°C, determine how long it will take for therefrigerator to cool them. The watermelons can be treated as water whose specific heat is 4.2 kJ/kgK.
An inventor designs a heat engine that operates between a high temperature reservoir of 800 K and a low temperature reservoir of 300 K with a heat transfer into the heat engine of 350 kW. It is claimed that 350 kW of heat is transferred to the low temperature reservoir. Is the inventor's design possible? Explain.
A refrigerator is removing .25 heat from a cold medium at 3°C at a rate of 7200 kJ/h and rejecting the waste heat to a medium at 30°C. If the coefficient of performance of the refrigerator is 2, the power consumed by the refrigerator is