H we = latent heat evaporization water ( 2454 kJ/kg - in air at atmospheric pressure and 20 oC)ĭw kg = humidity ratio difference (kg water/kg dry air) Latent heat due to the moisture in air can be calculated in SI-units as: Sensible Heat Load and Required Air Volume Chart (pdf).Sensible heat load and required air volume to keep the temperature constant at various temperature differences between make up air and room air: = 21.6 (Btu/hr) Sensible Heat Load and Required Air Volume Chart Using (1b) the sensible heat added to the air can be calculated as Using (1) the sensible heat added to the air can be calculated as Q = air volume flow (cfm, cubic feet per minute)ĭt = temperature difference ( oF) Example - Heating Air, Sensible HeatĪn air flow of 1 m 3/s is heated from 0 to 20 oC. The sensible heat in a heating or cooling process of air (heating or cooling capacity) can be calculated in SI-units asĬ p = specific heat of air (1.006 kJ/kg oC)
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