Abstract
This research analyzes the time lag, which is a thermal storage performance parameter, when a phase change material is applied to the floor heating system of a mock-up laboratory. The following results are obtained. In terms of the time required for the floor surface temperature to reach 30 °C, the time lag of Room 2 (i.e., the room with the PCM-based floor system) was observed to be 15 min. Additionally, in terms of the time required for the floor surface temperature to decrease to 22 °C, Room 2 exhibited a time lag of 5 h 2 min. Therefore, the study concluded that longer time lags are observed with floor heating systems with PCM.
Highlights
In the Republic of Korea, a majority of residential structures are equipped with floor heating systems[1]
It was be observed that the time lag in Room 2 owing to phase change material (PCM) was 5 h and 2 min
This research analyzes the time lag of a floor surface system when PCM was applied in a mock-up laboratory system
Summary
In the Republic of Korea, a majority of residential structures are equipped with floor heating systems[1]. In the cases of radiant floor heating systems, hot water is used as the heat source in concretebased systems compared to cases in other countries where a dry construction method is adopted[2]. Such floor heating systems are susceptible to a radical temperature decrease when their hot water supply is halted because of the low thermal storage performance of lightweight foamed concrete and mortar[3]. The time lag, which is a thermal storage performance characteristic, of a conventional floor heating system and a system equipped with phase change material was comparatively analyzed in a mock-up laboratory. The results of this study may be used to provide basic data to improve the thermal storage performance of floor heating systems, and in turn their energy performance
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