... littleeffect on design heating load around sunrise in Jan., Ï = 0.˙ci= design heating load due to conduction-infiltration through build-ing envelope during cold weather, 24,900 Btu/hr˙p= design ... Btu/hr˙tm= design latent heat stored by thermal massing, Btu/hr.As thermal massing typically has little effect on design heatingload around sunrise in Jan., ˙tm=0.˙ah= design auxiliary ... weather,86,000 Btu/hr˙tm= design latent heat stored by thermal massing, Btu/hr. Assume 0.˙ah= design auxiliary heat gain added to interior spaces at heating load design temperature, 0 Btu/hr˙...