Due to the large heat loss of the walls,glass greenhouses often have high energy consumption.Active pho-tovoltaic power generation and passive envelope structure energy-saving retrofit are proposed for the Venlo-type glass greenhouse in severe cold areas.The energy consumption,carbon reduction,and payback period are compared within the two methods for the optimal one.The results show that the Venlo-type PV greenhouse with a three-layer glass and a 9mm krypton gas air layer(CgⅢ)is the best energy-saving retrofit case,which save 130MWh of energy consumption per year,contributing to the promotion of glass greenhouses in severe cold areas.
photovoltaic power generationenclosure structureenergy saving ratecarbon reductionpayback period
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