Research On Low Temperature Water Radiant Heating Characteristic Of PCM Wallboard

Both of energy-saving and environmental protection are important topics in the field of energy using. At present, it's recognized that the low-temperature radiant heating technology is an effective way to solve the problem of energy and environment of the world. Because phase thermal storage has advantages of small temperature change and high storage density, the use of phase change materials in construction can increase the regenerator performance of the building envelope. thereby, it can reduce the indoor temperature fluctuations, increase comfort and improve the building thermal performance. In the view of the problem of energy and environment in our country, on the basis of low-temperature water floor radiant heating system, an advanced idea was put forward that low-temperature of hot water radiant heating system with PCM wallboard combining the characteristics of phase-change heat storage.In order to study the law about thermal storage and rejection of PCM wallboard, on the basis of the theory of phase-change heat transfer analysis, a series of reasonable simplification had been done about low-temperature of hot water radiant heating system with PCM wallboard. Besides, FLUENT software was used to do Numerical simulation. The impact of phase transition temperature, latent heat of phase change, phase-change layer thickness, water temperature, pipe diameter, pipe spacing, temperature and other factors on PCM wallboard's surface temperature, heat flux changes and heat storage capacity in the process of phase change heat transfer had been analyzed. The results showed that the increase of phase transition temperature, the thinning of phase-change layer thickness, the increase of water temperature, the diminishing of pipe spacing, the larger of pipe diameter will increase the phase transition temperature, latent heat of phase change obviously. The results of this study had played an theory guiding role of promotion and application of low-temperature of hot water radiant heating system with PCM wallboard.