a high school classroom is occupied by 40 students who each can produce 60 W of
ID: 1718287 • Letter: A
Question
a high school classroom is occupied by 40 students who each can produce 60 W of sensible heat and 0.1kg/h of moisture ( this is the portion of latent head produced). the class is to be maintained at 20 C and 50 percent relative humidity. Conditioned air is supplied at 15 C and 50 percent relative humidity. The load of lightning and equipment is 2000 W. a) Is any extra energy or water rate requirements to keep these conditions?. b) What the air coditions inside the classroom will be after 1 h if no extra heat energy or water is added or remove. Consider a pressure of 95 kPa
Explanation / Answer
a) To maintain a constant relative humidity with in these condition the air should be supplied at a lower moisture content than that of the air with in the space.
b) If you remove water from the air without changing the temperature your relative humidity goes down .
if you raise the temperature without adding water vapour then also relative humidity changes.
If there is no addition or removal of extra heat or water then all the conditions remains same.
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