Please, answer the following step by step A classroom that normally contains 40

Question

Please, answer the following step by step

A classroom that normally contains 40 people is to be air conditioned with window air conditioning units of 5kW cooling capacity. A person at rest may be assumed to dissipate thermal energy at a rate of 360 kJ/hr. There are 10 light bulbs in the room, each with a rating of 100 W. 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 constant temperature of 21 degree C, determine the number of window air conditioning units required.

Explanation / Answer

Cooling = heating

n*5 = 40*(360)/3600 + 10*100/1000 + 15000/3600

So 5n = 4 + 1 + 4.167

So n = 1.8333 = 2 (rounded)

So Number of window air conditioning units required = 2

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