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An 10ft x 10ft x 12ft mechanical room has 400 watts of lighting and some small...

An 10ft x 10ft x 12ft mechanical room has 400 watts of lighting and some small motors with a total output of 0.5 HP. All of the energy in the lighting and from the motors is converted into heat. Suppose the walls are well insulated, that is, no heat loss to the surroundings.

A) What is the increase in enthalpy of the room air from these sources (in Btu/hr)?

B) Calculate ventilation rate required to keep the room at a steady-state temperature. Temperature inside is 68ºF and outside is 28ºF.

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