Discuss the humidity in an air conditioned room and in aheated room in the winte

Question

Discuss the humidity in an air conditioned room and in aheated room in the winter.
Why should we use a humidifier and dehumidifer? If the outside temperature is 41 F and room temperature is 68F should weuse dehumidifer why or why not? I need all the help I can get with this question, could youexplain this in detail? Thank you. Discuss the humidity in an air conditioned room and in aheated room in the winter.
Why should we use a humidifier and dehumidifer? If the outside temperature is 41 F and room temperature is 68F should weuse dehumidifer why or why not? I need all the help I can get with this question, could youexplain this in detail? Thank you.

Explanation / Answer

Warm air can contain more moisture (water vapor) than cold air. Suppose you had a tightly closed container partially filledwith water. Then the air in the container would be saturated (at its dewpoint). If you warmed the container the water molecules would becomemore active and the vapor pressure of the water would increase and the dew point ofthe water would increase. If you are using an air conditioner you are cooling the air,but its water content does not change so the air approaches its dew point and the relativehumidity of the cooler air increases. In that case you might want to use a dehumidifier to reducethe water content in the air. Conversely, if you bring in cooler air and warm it thenthat air is capable of containing more moisture and its relative humidity is lower. So you might wantto use a humidifier to increase the relative humidity, as in the case of warming 41 Fair to 68 F air. This is only a generalization because it would depend on theactual outside relative humidity. If the outside air were at its dew point (such as on a foggyday) then you probably wouldn't need a humidifier after warming cooler air to a warmertemperature. It depends greatly on the relative humidities involved. Southern states have greater relative humidities in the summerand with the higher temperatures the air contains considerably more water vapor. Northern states may have outside air at very low relativehumidity in the winter time and warming this dry air to room temperature can produce very lowrelative humidities.

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