Banks, Court Houses, Municipal Buildings - SHR : 0.75 - 0.90.Auditoriums, Theaters - SHR : 0.65 - 0.75.If the SHR value for an evaporator is 75% (0.75) - 75% of the load cools the air (sensible load) and 25% of the loads dehumidifies the air (latent load). SHR = (1.005 kJ/kg o C ) (( 26 o C ) - ( 20 o C ) ) / (( 47 kJ/kg ) - (3 7 kJ/kg ))Ħ0% of the load provided to the room heats the air (sensible load) and 40% of the load provided humidifies the air (latent load). The Sensible Heat Ratio can be calculated as From the Mollier chart the enthalpy of the outlet air is 47 kJ/kg. The outlet temperature is 26 o C and the relative moisture of the outlet air is 40%. From the Mollier chart the enthalpy of the inlet air is 37 kJ/kg. The relative moisture of the inlet air is 50%. The inlet temperature to a room with some people is 20 o C. H i = inlet moist air enthalpy (kJ/kg, Btu/lb) Example - SHR for a room H o = outlet moist air enthalpy (kJ/kg, Btu/lb) SHR = c p (t o - t i ) / (h o - h i ) (2)Ĭ p = specific heat air (1.005 kJ/kg o C, 0.240 Btu/lb o F) Q t = total heat load - sensible heat and latent heat (kW, Btu/hr) SHR = sensible heat ratio (ratio of sensible heat load to total heat load) The Sensible Heat Ratio - SHR - is used to describe the ratio of sensible heat load to total heat load and can be expressed as:
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