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By Wang S.K.

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For air-conditioning systems that use flow rate control in the water cooling coil, space indoor relative humidity may be substantially higher in part load than at full load. Therefore, for comfort air-conditioning systems, the recommended indoor relative humidities, in %, are Summer Winter With humidifier Without humidifier Tolerable range Preferred value 30–65 40–50 25–30 Not specified In surgical rooms or similar health care facilities, the indoor relative humidity is often maintained at 40 to 60% year round.

On 1000 Hz the octave band has a higher limit of 1400 Hz and a lower limit of 710 Hz. Human ears do not respond in the same way to low frequencies as to high frequencies. The object of noise control in an air conditioned space is to provide background sound low enough that it does not interfere with the acoustical requirements of the occupants. The distribution of background sound should be balanced over a broad range of frequencies, that is, without whistle, hum, rumble, and beats. The most widely used criteria for sound control are the noise criteria NC curves.

Trad is defined as the temperature of a uniform black enclosure in which the surrounded occupant would have the same radiative heat exchange as in an actual indoor environment. Tr affects both the sensible heat exchange and evaporative losses, and Trad affects only sensible heat exchange. In many indoor environments, Trad ≈ Tr . 3. Relative humidity of the indoor air ϕr , in %, which is the primary factor that influences evaporative heat loss. 4. Air velocity of the indoor air vr , in fpm, which affects the heat transfer coefficients and therefore the sensible heat exchange and evaporative loss.

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Air-conditioning and refrigeration by Wang S.K.


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