Abstract

Radiant floor-heating systems offer advantages such as uniform indoor-temperature distribution, low noise, and efficient space use. However, excessive supply-water temperature can result in indoor- temperature overshooting and unnecessary heat use. Hence, outdoor reset control is introduced, which adjusts the supply-water temperature based on the outdoor air temperature. However, this method typically relies on the experience of facility managers and applies uniform settings without considering the specific thermal characteristics of each building, thus failing to resolve the problem. Therefore, this study is performed to derive building-specific heating curves and evaluate whether applying outdoor reset control using a building-specific heating curve can reduce indoor-temperature overshooting and unnecessary heat output. Through simulation, hot water is repeatedly supplied at varying temperatures to analyze the appropriate correlation among the outdoor air temperature, indoor temperature, and supply-water temperature, which represent the building-specific heating curve. The proposed outdoor reset control is compared with conventional methods. The simulation results clearly indicate a reduction in overshooting and unnecessary heat output. Future studies should investigate the energy performance by considering heat sources.