Recent years, photovoltaic technology had widely applied in building services engineering due to its direct electricity generation, and the integration of PV panels to building walls is a common application. PV walls not only can provide essential power energy for building, but also improve indoor thermal environment by reducing indoor heat gain contributed by transient heat transfer across walls. This paper introduces a simplified method to calculate heat gain hourly due to transient heat transfer across PV walls, when PV panel is directly attached to building walls and enclosed air gap between PV cell and wall exists. Analyzing effect of the dynamic heat transfer performance of PV wall on indoor heat gain hourly, PV cells, air gap and common insulated wall are considered a system when some necessary simplified conditions are applied. Two usual brick walls and corresponding PV walls are used as analyzing examples, the calculating results show PV walls can improve remarkably indoor thermal environment by reducing wall heat gain hourly. Extra evidence shows also that air gap between PV panel and insulated wall contribute more, than reduction of solar radiation due to the power generation of PV cell, in decreasing wall heat gain hourly.
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