Problem StatementA heat engine draws 14 kW of heat from a reservoir at 900 K. The work it produces drivesa refrigerator which produces a refrigeration capacity of 12 kW. Both devices reject heat toa reservoir at 300 K. What is the lowest possible temperature of the space cooled by therefrigerator?Answer TableCorrectStageDescriptionYour AnswerAnswer*1 Lowest temperature of cold space (K)Due DateGrade(%)PartWeight Attempt Action/Message TypeNov 7, 2024 11:59 pm 0.011/5Submit

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Answered: Problem Statement A heat engine draws…

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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SECOND LAW OF THERMODYNAMICS write your soln. complete. draw a sketch and explain if necessesary THANK YOU! answer it in 1hr
Provide complete solution and detailed diagram. The thermodynamic efficiency of a heat engine that rejects heat at a rate of 20 MW when heatis supplied to it at a rate of 60 MW is: A. 33.3% B. 50% C. 66.7% D. 75%
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Problem 5. A 1000 cubic foot room is initially at standard temperature and pressure. A resistance heater in the room is consuming 1500W of electricity. What is the air temperature of the room after 3 hours? Assume the room acts as an isolated system. Hint: The specific heat of a substance is the amount of heat it takes to warm one unit mass of material by one degree. The specific heat of air (assuming constant volume) can be taken as C₂ = 700J/kg°C. This relates the total heat added to the system to its temperature rise.
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In an absorption refrigerator, the energy driving the process is sllPplied not as work, but as heat from a gas flame. (Such refrigerators commonly use propane as fuel, and are used in locations where electricity is unavailable. *) Let us define the following symbols, all taken to be positive by definition: Qf = heat input from flame Qe = heat extracted from inside refrigerator Qr = waste heat expelled to room Tf = temperature of flame Te temperature inside refrigerator Tr = room temperature Explain why the "coefficient of performance" (COP) for an absorption refrigerator should be defined as Qc/Qf.
In an absorption refrigerator, the energy driving the process is sllPplied not as work, but as heat from a gas flame. (Such refrigerators commonly use propane as fuel, and are used in locations where electricity is unavailable. *) Let us define the following symbols, all taken to be positive by definition: Qf = heat input from flame Qe = heat extracted from inside refrigerator Qr = waste heat expelled to room Tf = temperature of flame Te temperature inside refrigerator Tr = room temperature Use the second law of thermodynamics to derive an upper limit on the COP, in terms of the temperatures Tf, Te, and Tr alone.
The Ocean Thermal Energy Conversion (OTEC) system in Hawaii utilizes the surface water and deep water as thermal energy reservoirs. Assume the ocean temperature at the surface to be 20 "C and at some depth to be 6 "C Determine the maximum possible thermal efficiency achievable by a heat engine. Express the thermal efficiency as a percentage to three significant figures. Thh = 478 % Previous Answers Correct Part B What-if Scenario What would the maximum efficiency be if the surface water temperatun increased to 25 C? | Express the thermal efficiency as a percentage to three significant figures.
A metal cylinder is filled with a room temperature perfect gas at 1 atm of pressure; upon pulling on the piston the gas is expanded. The gas of course initially cools, but then warms back to room temperature since it is in a non-insulating metal cylinder.a. What is the net ΔU and why? b. While still pulling on the piston after it warmed to room temperature, I wrap it in insulating glass wool to make the system adiabatic. Then I suddenly stop pulling on it. As no heat can be exchanged with the outside, tell me if the the piston will expand, compress, or stay the same and why?
2. a. Take B °C, then convert it to Fahrenheit and Kelvin. b. Find the amount of heat needed to change the temperature of B g of ice from -D °C to B °C. The specific heat of water is 4186 J/kg °C, Latent heat of fusion is 3.33 x105 J/kg, laten heat of vaporization 2.25 x 106 J/ kg. c. A patient of mass B kg is spiking a fever of 105 Fahrenheit. The patient is immersed in ice bath 0°C ice to reduce the fever immediately back down to 98.6 Fahrenheit. How much ice must melt (bath stays at 0°C water) for this temperature reduction to be achieved? Latent heat of fusion is 3.33 x105 J/kg. and Specific heat of body is 3500 J/kg °C. d. A Styrofoam ice box has a total area of C/100 m² and walls with an average thickness of 2.50 cm. The box contains beverages at 0°C. The inside of the box is kept cold by melting ice. How much ice melts in one day if the ice box is kept in the trunk of a car at 35.0°C? Thermal conductivity of ice 0.010 J/s m ºC, Latent heat of fusion is 3.33 x105 J / kg. B:27.0…

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