Simulation Of The Influence Of Solar Roof On Urban Thermal Environment And Energy Supply And Demand

The installation of solar photovoltaic roofs can alleviate the energy crisis and urban thermal environment damage caused by urbanization.This article introduces the heat transfer model of solar panels into the WRF's multi-layer urban canopy scheme,and simulates the impact of two types of solar roof installations(laminated and bracket)on the urban thermal environment and energy balance online.The results show:(1)Installation of the attached solar roof can reduce 2m temperature by 0.28°C during the daytime,and the cooling effect is better than that of the scaffolding roof,but the decrease of temperature at the nighttime is small.The scaffolding roof cools down to 0.22°C during the daytime,and the effect of cooling at the nighttime is significant.Compared with the ordinary roof,the temperature is lowered by 0.24°C;At 13:00,the attached roof has the most obvious cooling effect,while the scaffolding roof reaches its peak at 14:00.In addition,local warming may occur in the eastern coastal areas because of sea breeze circulation.With 10% increase in photovoltaic efficiency,urban temperature decreases by 0.13 °C.(2)The vertical wind speed on the boundary layer of the city surface in the commercial area is weakened,and the turbulent flow energy is reduced.The development of the boundary layer during the day is suppressed,and the height of the boundary layer is reduced.In the case of turbulent development,the weakening effect of photovoltaic roofs is more obvious.Due to the lower surface temperature during the day,the attached photovoltaic roof has a weaker heating effect on the atmosphere than the other roofs,and the turbulent flow energy intensity is the weakest.(3)When 100% solar photovoltaic roof is installed on a city roof,the photovoltaic power generation in residential areas can be basically enough,and in a commercial area,when the photovoltaic conversion efficiency is 32%,the power generation can fully cover the air conditioning energy consumption.In addition,its economic benefits are also considerable.Under the ideal assumption of constant costs,with the improvement of photoelectric conversion efficiency,the economic benefits of stent roofs in July can reach a maximum of 40.26 billion,and the investment recovery period only takes 4 years.