Experimental-based energy performance evaluation of low-cost retrofit strategy for aging low-rise residential building for carbon neutrality

The CO2 reduction policy has driven the remodeling policy to reduce the energy consumption of buildings, which can be implemented by insulating and replacing windows to reduce the energy consumption of buildings. However, due to energy poverty, many residents have limited opportunities for these projects. Therefore, economically accessible technologies were evaluated in this study. Specifically, practical technologies were applied and evaluated in practice, and a survey of 107 households was conducted to analyze the behavior of energy consumption behavior in the residential areas with buildings. The airtight performance of the window was improved by approximately 15% without replacing it, and energy consumption was reduced by 25%. In the case of electric energy consumption, the use of high-efficiency lighting showed the most direct reduction. However, the introduction of renewable energy into buildings that are not insulated can contribute to relative climate-dependent reductions, but whether direct reductions are possible needs to be examined more closely. Relatively inexpensive technologies have improved insulation performance and have a shorter payback period compared to window replacement, further solidifying economic feasibility.