Modeling the Heat Gain from Solar Radiation through Grating Smart Windows

Abstract

A method has been developed for calculating the heat gain from solar radiation for rooms with grating smart windows in order to further assess the impact on the operation of HVAC systems. Equations are obtained for calculating the transmittances of direct and diffuse solar radiation through smart windows, taking into account the geometric parameters of two filter gratings. Based on the transmittances, the primary component of the heat gain from solar radiation, which directly passed through the grating smart window, is calculated as the sum of direct and diffuse radiation. The secondary component of heat gain due emission of radiation absorbed by window glass, as well as the heat flux due to heat transfer, are calculated by known methods as for rooms with conventional smart windows. The developed method was tested using numerical simulation in the conditions of Orenburg for one selected chromogenic material for both filter gratings. Some advantages and disadvantages of grating smart windows compared to conventional ones have been identified.