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In Winter, the outside air is cool and hence, the process of air conditioning involves filtering, preheating and _____________

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In Winter, the outside air is cool and hence, the process of air conditioning involves filtering, preheating and _____________

(a) Dehumidification

(b) Humidification

(c) Condensation

(d) Circulation

I got this question in an interview.

This interesting question is from Variations in Ventilation System with Climate in chapter Acoustics and Ventilation of Construction & Building Materials

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Right answer is (b) Humidification

The explanation: The temperature of inside air will be higher than that of outside air and it will be economical to recirculate a part of room air. In winter air conditioning the circulated air is passed through filters and then it is preheated and humidified.

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