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Fundamentals of Thermodynamcs | 8th Edition | ISBN: 9781118131992 | Authors: Claus Borgnakke, Richard E. Sonntag
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Find the power output and the low T heat rejection rate

Chapter 5, Problem 48HP

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QUESTION:

Problem 48HP

Find the power output and the low T heat rejection rate for a Carnot cycle heat engine that receives 6 kW at 250° C and rejects heat at 30°C, as in Problem 5.40.

Problem 5.40

Assume a cyclic machine that exchanges 6 kW with a 250°C reservoir and has

a. Q L = 0 kW, ˙W = 6 kW

b. ˙Q L = 6 kW, ˙W = 0 kW

and ˙Q L is exchanged with a 30°C ambient. What can you say about the processes in the two cases, a and b, if the machine is a heat engine? Repeat the question for the case of a heat pump.

Questions & Answers

QUESTION:

Problem 48HP

Find the power output and the low T heat rejection rate for a Carnot cycle heat engine that receives 6 kW at 250° C and rejects heat at 30°C, as in Problem 5.40.

Problem 5.40

Assume a cyclic machine that exchanges 6 kW with a 250°C reservoir and has

a. Q L = 0 kW, ˙W = 6 kW

b. ˙Q L = 6 kW, ˙W = 0 kW

and ˙Q L is exchanged with a 30°C ambient. What can you say about the processes in the two cases, a and b, if the machine is a heat engine? Repeat the question for the case of a heat pump.

ANSWER:

Solution

Step 1 of 3

We need to find out the power output and the low temperature heat rejection rate.

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