Sustainable Energy
2nd Edition
ISBN: 9781337551663
Author: DUNLAP, Richard A.
Publisher: Cengage,
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Textbook Question
Chapter 8, Problem 8P
Compare the masses and volumes of water, concrete, sand, and wood needed to store 106 Btu of heat if the operating temperatures are Tc = 85°F and Th = 180°F. In each case, calculate the edge length of a square storage unit with a height of 8 ft.
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10 kg of saturated steam at 800 kPa are heated at constant pressure up to 400°C. The same happens (independently), but with 10 kg of air at 800 kPa, heated at constante pressure up to 400°C. Use the values from any air tables found on the internet. What is the work required, approximately in both cases? Choose the two correct alternatives for this two cases.
a) 1150kJ
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c) 960kJ
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