Research On Radiant Air-conditioning System For Library Reading-room In The Hot Summer And Cold Winter Zone

Most of the Hot Summer and Cold Winter Zone are located inYangtze River Valley, with typical climatic characteristics of muggy insummer and clammy in winter. With economic and social developmentand living standard improvement, people pay more and more attention torequirement of comfortable indoor environment, which leads to the rapidgrowth of air-conditioning energy consumption. The radiationair-conditioning system which based on independent temperature andhumidity control has pointed the way to improve the indoor thermalenvironment and cut down the power consumption for air-conditioning inHot Summer and Cold Winter Zone.The basic composition of radiation air-conditioning system andseveral commonly-used radiation air-conditioning terminal devices wereintroduced. A porous metal radiation ceiling air-conditioning system waspresented, according to the characteristics of Hot Summer and ColdWinter Zone climate and air conditioning load of library reading-room,which has the traits of low cost and good effects of energy-saving.A library reading Room of a university in Zhuzhou was taken as anexample for the theoretical analysis and calculation of the porous metalradiation ceiling air-conditioning system. The heat transfer process of theporous metal radiation ceiling air-conditioning system has been analyzed.The influence of the porous metal ceiling’s radiation cooling totemperature of building envelope inner surface has been researched. Thearticle has determined the indoor design temperature and relativehumidity of the air-conditioning system which satisfies the human’sthermal comfort based on PMV and discussed ventilation anddehumidification of this system. The energy saving ability of porousmetal radiation air conditioning system and conventional air conditioningsystem was analyzed and compared by energy analysis and exergyanalysis methods.Finally, the convection heat transfer between air and the porousmetal radiation ceiling was simulated by numerical method, to find outthe impact of aperture size and air velocity to Surface convective heat transfer coefficient. In the case of the same opening ratio, the smaller theapertures are, the larger surface convection heat transfer coefficient of theporous plate will be. And indoor thermal environmental of the porousmetal radiation ceiling air-conditioning system was simulated. The resultsshow a good indoor thermal comfort.