Physics for Scientists and Engineers: Foundations and Connections
1st Edition
ISBN: 9781133939146
Author: Katz, Debora M.
Publisher: Cengage Learning
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Chapter 22, Problem 29PQ
To determine
Best possible coefficient of performance for a household refrigerator for a given high and cold temperature.
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A refrigerator has a coefficient of performance of 3.00. The ice tray compartment is at -10.0°C, and the room temperature is 17.0°C. The refrigerator can convert 22.0 g of water at 17.0°C to 22.0 g of ice at -10.0°C each minute. What input power is required? Give your answer in watts.
A refrigerator has a coefficient of performance of 4.90. The ice tray compartment is
at -15.6°C, and the room temperature is 22.5°C. The refrigerator can convert 9.4 g
of water at 22.5°C to 9.4 g of ice at -15.6°C each minute.
Cice = 2090 J/(mol K); cwater = 4186 J/(mol K); Lf = 333000 J/kg
What input power is required? Give your answer in watts to one decimal.
Suppose you have an ideal refrigerator that cools an environment at -20.0C and has heat transfer to another environment at 50.0C. What is its coefficient of performance?
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 refrigerator has 18.0 kJ of work done on it while 115 kJ of energy is transferred from inside its interior. What is its coefficient of performance? (a) 3.40 (b) 2.80 (c) 8.90 (d) 6.40 (e) 5.20arrow_forwardThe second law of thermodynamics implies that the coefficient of performance of a refrigerator must be what? (a) less than 1 (b) less than or equal to 1 (c) greater than or equal to 1 (d) finite (e) greater than 0arrow_forwardA refrigerator has 18.0 kJ of work clone on it while 115kJ of energy is transferred from inside its interior. What is its coefficient of performance? (a) 3.40 (b) 2.80 (c) 8.90 (d) 6.40 (e) 5.20arrow_forward
- Show 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_forwardSuppose an ideal (Carnot) heal pump could be constructed, (a) Using Equation 12.15, obtain an expression for the coefficient of performance for such a heat pump in terms of Th and Tc. (b) Would such a heal pump work better If the difference in the operating temperatures were greater or smaller? (c) Compute the coefficient of performance for such a heat pump if the cold reservoir is 50.0C and indoor temperature is 70.0C.arrow_forwardHow long would a 5.00 kW space heater have to run to put into a kitchen the same amount of heat as a refrigerator (coefficient of performance = 2.00) does when it freezes 1.25 kg of water at 23.0°C into ice at 0.0°C?arrow_forward
- (c) State equations that describe the performance of a refrigerator. (d) A kitchen is too warm for you to stay during summer. You leave the refrigerator door open to cool the kitchen. Does this cooling method work efficiently? Explain your answer.arrow_forwardProblem 21.20 Consider the refrigerator shown in (Figure 1). Figure 105 J Adiabats < 1 of 1 W, = -119 J W, = 78 J V ▼ ▼ Part A What is the heat extracted from the cold reservoir for the refrigerator? Express your answer with the appropriate units. Qc = Submit Part B K= Submit HA Value What is the coefficient of performance for the refrigerator shown in the following figure? Provide Feedback Units Request Answer IVE ΑΣΦ ? Request Answer ?arrow_forwardAn ideal Refrigerator keeps its inside temperature at 2.00°C while it is 23.0°C outside of it. Which of the following is true? (choose 2 correct answers) Heat is moved into the refrigerator The coefficient of performance is is 0.0952 The coefficient of performance is 0.0709 Heat is moved out of the refrigerator The coefficient of performance is is 13.1arrow_forward
- The inside of your refrigerator is approximately 0°C. Heat from the inside of your refrigerator is deposited into the air in your kitchen, which has a temperature of approximately 20°C. At these operating temperatures, what is the maximum possible coefficient of performance of your refrigerator?arrow_forwardA refrigerator has a coefficient of performance of 2. The ice (cice = 2090 J/kg.°C) tray compartment is at –12°C, and the room temperature is 48°C. The refrigerator can convert 2.44 g of water (cwater= 4186 J/kg.°C) at 48°C to 2.44 g of ice at -12°C each minute. What input power (in W) is required? (Answer in 2 decimal places) A Moving to another question will save this response. « Close Windowarrow_forwardA heat pump moves heat from the chilly 8°C air outside a house to the toastier 21°C air inside. The actual coefficient of performance of the system is 3.2, a typical value. How much energy would it take to add 11 kJ each second if the heat pump ran at the maximum theoretical efficiency?arrow_forward
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