With lower solar radiation, exhaust ventilation decreases the electrical output, but it boosts the peak output by up to 1.69 W/m 2 when the solar radiation is high. The average PV temperatures for the EVPV-HP and NVPV systems are 11.86 and 9.71 ℃, respectively.
The solar module cooling technique can be applied in PV systems in structures that can use exhaust air from HVAC systems. Cooling is achieved through the forced convection of exhaust air on the rear sides of the panels, to absorb excess heat through heat transfer.
The incorporation of exhaust air (EA) heat recovery (HR) technology into BIPV systems presents an energy-efficient solution to BIPV overheating, but its application to PV curtain walls is limited. Dahmane et al. suggested utilizing cold EA to cool PV modules by up to 9.46 ℃.
Exhaust ventilation improves PV curtain wall’s thermal and electrical performance. Using outlet exhaust for outdoor air handling reduces reheat energy. Heated/cooled exhaust as heat source/sink enhances heat pump COP. System achieves 17.05% higher annual energy efficiency than conventional.
A photovoltaic forced ventilated façade (PV-FVF) as heat source for a heat pump: Assessing its energetical profit in nZEB buildings Performance prediction of a novel double-glazing PV curtain wall system combined with an air handling unit using exhaust cooling and heat recovery technology
A French-Lebanese research group has proposed a way to cool down PV modules by using air exhausted from heating, ventilation, and air conditioning (HVAC) systems. They showed that array performance improves when the cooling load rises.