Problem 4-Carnot Heat Engine ( A Carnot heat engine operates between a source at 600°C and a sink at 300°C. Please answer the following. a. What is the temperature of the isothermal processes in the Carnot cycle? Why? Justify your answer. b. Compute the thermal efficiency. c. The source supplies steadily 20 kW to the engine operating as a Carnot heat engine. Compute the heat transferred to the sink, express your answer with the correct units for this problem.

Problem 4-Carnot Heat Engine ( A Carnot heat engine operates between a source at 600°C and a sink at 300°C. Please answer the following. a. What is the temperature of the isothermal processes in the Carnot cycle? Why? Justify your answer. b. Compute the thermal efficiency. c. The source supplies steadily 20 kW to the engine operating as a Carnot heat engine. Compute the heat transferred to the sink, express your answer with the correct units for this problem.

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter45: Domestic Refrigerators And Freezers

Section: Chapter Questions

Problem 12RQ: Refrigerators currently being manufactured in the United States are using______as their refrigerant.

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Two Carnot engines are hooked up in series so that the waste thermal energy at constant tempera- ture TM for the first engine is used as the heat source for the second engine. The high temperature reservoir for engine 1 is at TH = 327 C. The low temperature reservoir for engine 2 is at TL = 27 C. TL < TM < TH. For what value of TM in C will the combined engine produce the greatest total work output, wi + w2? TH 1 W1 TM 2 W2 TL Figure 2: Two Carnot engines operate in series.
A particular power plant operates with a heat source reservoir at 350 C and a heat sink reservoir at 30 C. It has a thermal efficiency equal to 45 % of the Carnot engine thermal efficiency for the same temperatures. a. What is the thermal efficiency of the plant? b. To what temperature must the heat reservoir be raised to increase the thermal efficiency of the plant to 35 %? Again the thermal efficiency is 45 % of the Carnot engine thermal efficiency.
THERMODYNAMICS (UPVOTE WILL BE GIVEN. PLEASE WRITE THE COMPLETE SOLUTIONS. NO LONG EXPLANATION NEEDED. ANSWER IN 3 DECIMAL PLACES. BOX THE FINAL ANSWERS. PLEASE ANSWER ALL Two Carnot heat engines operate in series. The first heat engine absorbs heat of 100kW at 400°C while second heat engine rejects heat at 100°C. If the efficiencies of the heat engines are the same,a. Draw the schematic diagram of the systemb. Find the intermediate temperature in between the heat enginesc. Heat rejected for both heat engines
SL-3 A refrigerator with K-4 and a reversible heat engine operate between two heat reservoirs at 300K and 400K. During each cycle of operation the engine produces 500J of work, which is the entire work input to the refrigerator for each cycle. a) Write down or calculate the magnitudes of the Wk, Q, and Qe for one cycle of operation of the engine. b) Write down or calculate the magnitudes of the Wk, Qh, and Qe for one cycle of operation of the refrigerator. c) Calculate the magnitudes of the Wkecl, Qhnet, and Qenet for one cycle of operation of the system. d) Show on a diagram like the one above for problem SL-1 the energy flow for the engine and refrigerator individually on the left and the net energy flow for the engine-refrigerator system on the right. e) Does this net result violate the second law of thermodynamics? EXPLAIN your answer.
In a test of cycle steam power plant, the measured rate of the steam supply was 7.1kg / s when the net rate of work output was 5000Kw. The feed water was supplied to the boiler at a temp of 38 ° C, and the superheated steam leaving the boiler was at 1.4 Mpa and 300 ° C. Calculate the thermal efficiency of the cycle and the heat rate, what would be the heat rate when expressed in BTU of heat input per kWh of work output.
Carnot heat engine which produces 10 kJ of work for one cycle has a thermal efficiency of 50 percent. The working fluid is 0.50 kg of air, and the pressure and volume at the beginning of the isothermal expansion are 7 bars and 0.119 m3, respectively. Find a. the maximum and minimum temperatures for the cycle, in degrees Kelvin,  b. the net work , and c. the volume at the end of the isothermal expansion process , in m3.
8.35 Consider a Carnot-cycle heat engine with water as the working fluid. The heat transfer to the water occurs at 300°C, during which process the water changes from saturated liquid to saturated vapor. The heat is rejected from the water at 40°C. Show the cycle on a T-s diagram and find the quality of the water at the beginning and end of the heat re- jection process. Determine the net work output per kilogram water and the cycle thermal efficiency.
Question 6: A Carnot heat engine absorbs 2000 J of heat from the source of heat engine at 227° C and rejects 1200 J of heat during each cycle to sink. Calculate efficiency of engine temperature of sink and amount of work done during each cycle.
You are a Mechanical Engineer working with ideal heat engines operating on the Otto and Diesel cycles. Aclient asks you to discuss the performance of internal combustion engines and presents you with twoscenarios as follows:AIR STANDARD OTTO CYCLE:1) The maximum and minimum temperatures are 1400°C and 15°C2) The heat supplied per kilogram of air is 800 kJ.AIR STANDARD DIESEL CYCLE:1) The maximum and minimum cycle temperatures are 1650°C and 15°C respectively2) The maximum cycle pressure is 45 bar3) The compression ratio is 15/1.Write a report for the client, in which you:a) Describe with the aid of diagrams the operational sequence of four stroke spark ignition andfour stroke compression ignition engines.b) Explain the mechanical efficiency of two and four stroke engines.c) Discuss and evaluate the performance of two stroke and four stroke diesel engines.d) For the Otto cycle, calculate:i The compression ratioii The cycle efficiencyiii The ratio of maximum to minimum pressures in the…
6. Calculate the thermal efficiency of a Carnot cycle heat engine operating between reservoirs at 300°C and 45°C. 44.5026%
In a test of cycle steam power plant, the measured rate of the steam supply was 7.1kg/s when the net rate of work output was 5000Kw. The feed water was supplied to the boiler at a temp of 38 0C, and the superheated steam leaving the boiler was at 1.4 Mpa and 3000C. Calculate the thermal efficiency of the cycle and the heat rate, what would be the heat rate when expressed in BTU of heat input per kWh of work output. Ans [24.44%,13955 BTU/kwh]
B) A reversible heat engine operates between two reservoirs at temperatures of 600°C and 40°C. The engine drives a reversible refrigerator which operates between reservoirs at temperatures of 40°C and -20°C. The heat transfer to the heat engine is 2000 kJ and the net work output for the combined engine refrigerator is 360 kJ. (i) Calculate the heat transfer to the refrigerant and the net heat transfer to the reservoir at 40°C. (ii) Reconsider (i) given that the efficiency of the heat engine and the C.O.P. of the refrigerator are each 40 per cent of their maximum possible values.