The room in Problem 5.90 has a combined thermal mass of 2000 kg wood, 250 kg steel,

Question:

The room in Problem 5.90 has a combined thermal mass of 2000 kg wood, 250 kg steel, and 500 kg plaster board, Cp = 1kJ/kg-K. Estimate how quickly the room heats up if the air conditioner is turned off on a day when it is 35◦C outside.


Data from Problem 5.90

A window air conditioner cools a room at TL =20◦C with a maximum of 1.2kWpower input. The room gains 0.6 kW per degree temperature difference to the ambient, and the refrigeration COP is β =0.6 βCarnot. Find the maximum outside temperature, TH, for which the air conditioner provides sufficient cooling.


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Related Book For  book-img-for-question

Fundamentals Of Thermodynamics

ISBN: 9781118131992

8th Edition

Authors: Claus Borgnakke, Richard E. Sonntag

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