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Necessary cooling and dehumidifying capacity formula

Air volume (m3/min)×60× enthalpy difference (kcal/kg(DA))× air density (1.2kg(DA)/m3)÷0.86

(Exercise)
*Cooling and dehumidifying capacity when air quantity 10m3 /min, OA (1):25°C, 60% SA:23°C, 55%
OA(1):25°C, 60%: Enthalpy value ratio → 13.24kcal/kg (DA)
SA:23°C, 55%: Enthalpy value ratio → 11.38kcal/kg (DA), dew point13.5°C
dew point of SA 13.5°C, 100%: Enthalpy value ratio → 9.06kcal/kg (DA)
from necessary cooling and dehumidifying capacity formula
10×60×(13.24 - 9.06)×1.2÷0.86=3500(W)


In case of heating, the water vapour content in the dry air does not change. Only sensible change is the heat change and this can be substituted by the below mentioned formula.

Air volume(m3/min)×60×(pre-set temperature  suction temperature)×(air density × specific heat)(0.29kg(DA)/m3)÷0.86

Necessary heating capacity formula

Air volume (m3 /min)×60× enthalpy difference (kcal/kg(DA))× air density (1.2kg(DA)/m3 )÷0.86

(Exercise)
*What is the required heating capacity when the air quantity20m3 /min, OA(2):20°C, 40% SA:23°C, 55%?
Required heating capacity formula
20×60×(23-20)×0.29÷0.86=1214(W)

Necessary humidification capacity formula

Air volume(m3/min)×60× absolute humidity difference (kg/kg(DA))× air density (1.2kg(DA)/m3)

(Exercise)
*What is the required humidification capacity when air quantity 20m3 /min, OA (2):20°C, 40% SA:23°C,55%?
OA (2):20°C、40%: absolute humidity → 0.0058kg/kg(DA)
SA:23°C, 55%: absolute humidity → 0.0096kg/kg(DA)
Required humidification capacity formula
20×60×(0.0096 - 0.0058)×1.2=5.472(kg/h)

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