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Engineering and Tech / Fundamentals of Thermodynamcs 8 / Chapter 5 / Problem 140EUP

Fundamentals of Thermodynamcs | 8th Edition | ISBN: 9781118131992 | Authors: Claus Borgnakke, Richard E. Sonntag

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Thermal storage is provided with a rock (granite) bed of

Chapter 5, Problem 140EUP

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QUESTION:

Problem 140EUP

Thermal storage is provided with a rock (granite) bed of 70 ft3 that is heated to 720 R using solar energy. A heat engine receives QH from the bed and rejects heat to the ambient at 520 R. The rock bed therefore cools down, and as it reaches 520 R, the process stops. Find the energy the rock bed can give out. What is the heat engine efficiency at the beginning of the process, and what is it at the end of the process?

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QUESTION:

Problem 140EUP

Thermal storage is provided with a rock (granite) bed of 70 ft3 that is heated to 720 R using solar energy. A heat engine receives QH from the bed and rejects heat to the ambient at 520 R. The rock bed therefore cools down, and as it reaches 520 R, the process stops. Find the energy the rock bed can give out. What is the heat engine efficiency at the beginning of the process, and what is it at the end of the process?

ANSWER:

Solution 140 EUP

Step 1 of 6

We are required to calculate the energy of the rock bed

We need to calculate the efficiency at beginning and end

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