Study On The Thermal Properties And Climate Suitability Of Phase Change Thermal Storage Building In Summer

Phase change thermal storage walls as a new type of energy-saving buildingenvelopes has became a hot research topic. The phase change latent heat released bythe isothermal phase change and stored heat (cold) from indoor environment. Thestored heat (cold) could be released in some certain way when it need be used.Through this thermal transfer method, it improves indoor comfortable degree anddecreases building consumption. In order to analyze thermal properties andconsumption of phase change building, this paper studied thermal properties andclimate suitability of phase change building in summer by experiment and theory.Three different contrast experiments between phase change room (PCM room)and ordinary room with same dimensions and building envelope were developed.Three experiments can be divided as passive thermal storage phase (natural thermalstorage phase) and active thermal storage phase (night ventilation phase and airconditioning thermal storage phase). Compared indoor temperature, wall temperatureand power consumption of two rooms, it can be found the indoor temperature of PCMroom were lower than ordinary room about1.21℃,1.02℃respectively in naturalthermal storage phase and night ventilation phase. In air conditioning thermal storagephase, daily average energy-saving rate of PCM room was4.95%, whenair-conditioning only opened at night, while when air-conditioning run throughout theday, the rate decreased to2.03%.Based on partial phase change phenomenon in actual phase change transferprocess, a coefficient of latent heat use ratio was presented. A one-dimension apparentspecific heat capacity phase change thermal transfer model was set up and compiledto phase change wall thermal transfer type (Type272) in TRNSYS. The phase changestorage building moel in TRNSYS was presented. The model was validated byexperiment data. Finally, the influence of phase change temperature, latent heat andthermal conductivity to indoor thermal environment was analyzed by this model andthe integrated optimizations of thermal properties of PCMs in different climate zoneswere presented. This paper validated the application effect of phase change building in differentthermal storage method by experiment, which can be provided as references for later.A simple, good TRNSYS phase change thermal storage building model was presentedand validated, which can simulated major phase change building situations. Thismodel analyzed the influence of thermal properties of PCMs on indoor environment,proposed integrated optimized selection PCMs in different climate zones, whichprovided tool and engineering reference for design of phase change building andselection of PCM in future.