노후 단독주택에서 쿨루프의 적용을 통한 냉난방 요구량 변화에 대한 해석적 연구 (An Analytical Study on Heating and Cooling Demand Using Cool Roof System in Deteriorated Single Family House)

A cool roof has the advantage of reducing the urban heat island effect and building cooling requirement by reflecting solar radiation on the roof surface. Therefore, it is being used as a green remodeling technology for deteriorated buildings. However, to evaluate the performance of the cool roof, it is necessary to evaluation of increases of heating demand due to the decrease of solar heat gain in winter. The ratio of heat gain and loss on the roof surface was analyzed according to the insulation level of old buildings. In particular, buildings with good insulation can reduce heat loss in winter, but may increase cooling requirements in summer. Therefore, reducing the heat gain through the cool roof in summer can be a good alternative. It was confirmed that the heat gain in summer through the roof surface decreased rather than the heat gain in winter, so, the heating and cooling demand was reduced by 27% on the flat roof and 30% or more on the slope roof.

A cool roof has the advantage of reducing the urban heat island effect and building cooling requirement by reflecting solar radiation on the roof surface. Therefore, it is being used as a green remodeling technology for deteriorated buildings. However, to evaluate the performance of the cool roof, it is necessary to evaluation of increases of heating demand due to the decrease of solar heat gain in winter. The ratio of heat gain and loss on the roof surface was analyzed according to the insulation level of old buildings. In particular, buildings with good insulation can reduce heat loss in winter, but may increase cooling requirements in summer. Therefore, reducing the heat gain through the cool roof in summer can be a good alternative. It was confirmed that the heat gain in summer through the roof surface decreased rather than the heat gain in winter, so, the heating and cooling demand was reduced by 27% on the flat roof and 30% or more on the slope roof.