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SSEBop Explained with the “Psychrometry” <br />Principle, Cont’d <br />PCpP <br />TwTdesea <br />10 3*665.0 <br />)( <br /> <br /> <br /> <br /> <br /> <br /> psychrometric constant [kPa °C-1] <br />P atmospheric pressure [kPa], <br /> latent heat of vaporization, 2.45 [MJ kg-1] <br />cp specific heat of air at constant pressure, <br />1.013 10-3 [MJ kg-1 °C-1] <br /> ratio molecular weight of water vapor/dry air <br />= 0.622. <br />ea = actual vapor pressure (kPa) <br />es = saturated V.P. (kPa) at Tw <br />Ferrel, W.M. (1886); Allen et al. (1998) <br />