<p>a 40 student class is to be air conditioned with window air conditioning unit

Question

<p>a 40 student class is to be air conditioned with window air conditioning units each with 5 kw cooling capacities. a student at rest is assumed to dissipate heat at a rate of 360 kJ/h. there are 10 light fixtures in the room, each with a rating of 100 W. the rate of heat transfer into the class room through the walls and the windows is estimated to be 15000 kJ/h. if the room air temperature needs to be maintained at a constant 21 C how many window air conditioning units are required</p>

Explanation / Answer

Heat entering the room in one second = 40*360*1000/3600 + 10*100 + 15000*1000/3600 = 9167 J So, number of air conditioners required = 9167/5000 = 2

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