Q3) On a hot summer day, a student turns his fan on when he leaves his room at 9.00 am. When he returns at 1.00 pm, will his room be warmer or cooler than the neighboring rooms? Why? Assume all the doors and windows are kept closed.

Q3) On a hot summer day, a student turns his fan on when he leaves his room at 9.00 am. When he returns at 1.00 pm, will his room be warmer or cooler than the neighboring rooms? Why? Assume all the doors and windows are kept closed.

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

Chapter42: Heat Gains And Heat Losses In Structures

Section: Chapter Questions

Problem 12RQ

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Concept explainers

Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.

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Q3) On a hot summer day, a student turns his fan on when he leaves his room at 9.00 am. When
he returns at 1.00 pm, will his room be warmer or cooler than the neighboring rooms? Why?
Assume all the doors and windows are kept closed.

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Pls.answer thank you! A classroom that normally contains 40 people is to be air-conditioned with window air-conditioning units of 5 KW cooling capacity. A person at rest may be assumed to dissipate heat at a rate of about 360 KJ/hr. There are 10 light bulbs in the room, each with a rating of 100 watts. The rate of heat transfer to the classroom through the walls and the windows is estimated to be 15,000 KJ/hr. If the room air is to be maintained at a constant temperature of 21°C, determine the number of window air-conditioning units required.
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