1. A Carnot refrigerator operates between two reservoirs, one at 250K and the other at 300K. It isclaimed that the refrigerator has a COPr of 6. Determine:a. If the energy removed from the low temperature reservoir is 160 kJ, then what is theenergy delivered to the high temperature reservoir and how much work must be putinto the system.b. Is the refrigerator even possible?

The objective of the question is to determine the energy delivered to the high temperature reservoir…

Answered: 1. A Carnot refrigerator operates…

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

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Thermodynamics Water is being cooledd in a closed container while being stirred by a paddle wheel. During thisprocess, 25 kJ of heat is taken away from the water, and 15 kJ of heat is added to the water. Thepaddle-wheel work amounts to 5 N.m. Determine the final energy of the system if its initialenergy is 10 kJ. (Sketch the system boundaries)
An older refrigerator uses 4.22 kWh per day while an Energy Star refrigerator uses 0.78 kWh per day (both running continuously). What is the difference in power between the two refrigerators? If your electricity costs $0.13 per kWh, how much money does the Energy Star refrigerator save over 5 years?
A refrigerator operates at steady-state with a COP of 4.5 and power input of 0.8kW. If energy is rejected from the refrigerator to the surroundings at 20°C because of heat transfer from metal coils, the rate of energy rejection is computed as kW and the lowest theoretical temperature inside the refrigerator would be °C.
4. What is the second law of thermodynamics, give its Clausius and Kelvin-Planck statements and justify on their basis why a perpetual motion machines that extracts heat from ambient environment to do work is not feasible. What is difference between reversible and an internally reversible process, and why are most actual processes considered irreversible. Numerical:
The Kelvin-Planck and Clausius statements of thermodynamics are equivalent. In order to prove the equivalence, a heat-engine-refrigerator combined system is used as shown below. The system satisfies the following conditions, where QH and QL are known values. 1) Heat recieved by the heat engine from the source: QH,HE=QH 2) Heat QH is completely converted into net work output from the heat engine: QH=Wnet 3) Heat recieved by the regrigerator from the sink: QL,R=QL What is the heat received from the sink by the combined system, QL,sys?__________ A. QL B. QH C. QH+QL D. QH-QL

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