Physics for Scientists and Engineers: Foundations and Connections
1st Edition
ISBN: 9781133939146
Author: Katz, Debora M.
Publisher: Cengage Learning
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Question
Chapter 22, Problem 32PQ
To determine
The status of the coefficient of performance as time goes on as the refrigerator run continuously.
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Suppose you want to operate an ideal refrigerator that has a cold temperature of -8.5°C, and you would like it to have a coefficient of performance of 9.5.
What is the temperature, in degrees Celsius, of the hot reservoir for such a refrigerator?
Problem 2:
A refrigerator has a coefficient of performance equal to 5. The refrigerator discards 150 J of heat into the high temperature
reservoir in each cycle. Find that the amount of heat the refrigerator absorbs from the cold reservoir during in each cycle.
A heat pump maintains a dwelling at 68°F. When operating steadily, the power input to the heat pump is 3 hp, and the heat pump
receives energy by heat transfer from 55°F well water at a rate of 500 Btu/min.
(a) Determine the coefficient of performance.
(b) Evaluating electricity at $0.08 per kWh, determine the cost of electricity in a month when the heat pump operates for 300 hours.
* Your answer is incorrect.
Determine the coefficient of performance.
y = i 82.25
Chapter 22 Solutions
Physics for Scientists and Engineers: Foundations and Connections
Ch. 22.2 - Prob. 22.1CECh. 22.4 - Prob. 22.2CECh. 22.5 - Prob. 22.3CECh. 22.7 - You have considerable intuition about whether some...Ch. 22.9 - Prob. 22.5CECh. 22 - Prob. 1PQCh. 22 - Heat Engines Figure P22.2 shows a Carnot cycle....Ch. 22 - Use a PV diagram such as the one in Figure 22.2...Ch. 22 - Prob. 4PQCh. 22 - Prob. 5PQ
Ch. 22 - Prob. 6PQCh. 22 - An engine with an efficiency of 0.36 can supply a...Ch. 22 - Prob. 8PQCh. 22 - Prob. 9PQCh. 22 - Prob. 10PQCh. 22 - Prob. 11PQCh. 22 - Prob. 12PQCh. 22 - Prob. 13PQCh. 22 - Prob. 14PQCh. 22 - Prob. 15PQCh. 22 - Prob. 16PQCh. 22 - Prob. 17PQCh. 22 - Prob. 18PQCh. 22 - Prob. 19PQCh. 22 - Prob. 20PQCh. 22 - Prob. 21PQCh. 22 - In 1816, Robert Stirling, a Scottish minister,...Ch. 22 - Prob. 23PQCh. 22 - Prob. 24PQCh. 22 - Prob. 25PQCh. 22 - Prob. 26PQCh. 22 - Prob. 27PQCh. 22 - Prob. 28PQCh. 22 - Prob. 29PQCh. 22 - Prob. 30PQCh. 22 - Prob. 31PQCh. 22 - Prob. 32PQCh. 22 - Prob. 33PQCh. 22 - Prob. 34PQCh. 22 - Prob. 35PQCh. 22 - Estimate the change in entropy of the Universe if...Ch. 22 - Prob. 37PQCh. 22 - Prob. 38PQCh. 22 - Prob. 39PQCh. 22 - Prob. 40PQCh. 22 - Prob. 41PQCh. 22 - Prob. 42PQCh. 22 - Prob. 43PQCh. 22 - Prob. 44PQCh. 22 - Prob. 45PQCh. 22 - Prob. 46PQCh. 22 - Prob. 47PQCh. 22 - Prob. 48PQCh. 22 - Prob. 49PQCh. 22 - Prob. 50PQCh. 22 - Prob. 51PQCh. 22 - Prob. 52PQCh. 22 - Prob. 53PQCh. 22 - Prob. 54PQCh. 22 - Prob. 55PQCh. 22 - Prob. 56PQCh. 22 - What is the entropy of a freshly shuffled deck of...Ch. 22 - Prob. 58PQCh. 22 - Prob. 59PQCh. 22 - Prob. 60PQCh. 22 - Prob. 61PQCh. 22 - Prob. 62PQCh. 22 - Prob. 63PQCh. 22 - Prob. 64PQCh. 22 - Prob. 65PQCh. 22 - Prob. 66PQCh. 22 - Prob. 67PQCh. 22 - Prob. 68PQCh. 22 - Prob. 69PQCh. 22 - Prob. 70PQCh. 22 - A system consisting of 10.0 g of water at a...Ch. 22 - Prob. 72PQCh. 22 - Figure P22.73 illustrates the cycle ABCA for a...Ch. 22 - Prob. 74PQCh. 22 - Prob. 75PQCh. 22 - Prob. 76PQCh. 22 - Prob. 77PQCh. 22 - Prob. 78PQCh. 22 - Prob. 79PQCh. 22 - Prob. 80PQCh. 22 - Prob. 81PQ
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- A Carnot engine has an efficiency of 0.60. When the temperature of its cold reservoir the efficiency drops to 0.55. If initially Tc=27, determine (a) the constant value of Th and (b) the final value of Tc.arrow_forwardShow that the coefficients of performance of refrigerators and heat pumps are related by COPref=COPhp1. Start with the definitions of the COP s and the conservation of energy relationship between Qh, QC, and W.arrow_forwardA certain refrigerator has a coefficient of performance of 1.8. If this refrigerator absorbs 2.5x10^4 J of heat from the cold reservoir during each cyle, how much mechanical work is needed to run this refrigerator for each cyle? how much heat does the refrigerator dump into the hot reservoir during each cycle?arrow_forward
- A refrigerator extracts 400 J of heat from a box during each cycle and rejects 600 J to a high-temperature reservoir. What is the coefficient of performance?arrow_forwardWhat is the coefficient of performance of a refrigerator that operates with Carnot efficiency between temperatures -3.00°C and +30.0°C?arrow_forwardA Carnot refrigerator has a coefficient of performance of 2.5. The refrigerator consumes 50 W of power. How much heat is removed from the interior of the refrigerator in 1 hour?arrow_forward
- A heat pump used to warm a home must employ a cycle that produces a working fluid at temperatures greater than typical indoor temperature so that heat transfer to the inside can take place. Similarly, it must produce a working fluid at temperatures that are colder than the outdoor temperature so that heat transfer occurs from outside. Its hot and cold reservoir temperatures therefore cannot be too close, placing a limit on its COPhp . What is the best coefficient of performance possible for such a heat pump, if it has a hot reservoir temperature of 45.0ºC and a cold reservoir temperature of −15.0ºC ?arrow_forwardA refrigerator has a coefficient of performance of 2.0. In each cycle it absorbs 3.4×104 J of heat from the cold reservoir. During each cycle, how much heat is released to the high-temperature reservoir?arrow_forwardConsider natural gas furnace, electric resistance and heat pump systems. For a specified heating load, which one of these three systems will do the job with least irreversibility? Explain.Please type the answerarrow_forward
- A. Consider a heat engine that draws 55 J of heat from a hot reservoir and discards 35 J of heat to a cold reservoir. If the cycle repeats itself every 2 s, what is the total amount of work that can be obtained from the heat engine in 8 s? B, What is the coefficient of performance of a refrigerator that discards 87 J of heat to a hot reservoir and draws 68 J of heat from a cold reservoir? C. The exhaust fan of a CPU usually works at an angular speed of 125 rad/s. When the CPU overheats, the exhaust fan can accelerate to an angular speed of 275 rad/s in 2.00 s. What is the fan’s average angular acceleration during this interval?arrow_forwardProblem 13: Suppose you want to operate an ideal refrigerator that has a cold temperature of -11.5°C, and you would like it to have a coefficient of performance of 6.5. What is the temperature, in degrees Celsius, of the hot reservoir for such a refrigerator? Th = |arrow_forwardA refrigerator removes heat from a freezing chamber at -8 ⁰F and discharges it at 99 ⁰F. What is its maximum coefficient of performance?arrow_forward
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