Simulation Of Indoor Thermal Environment Of Natatorium With Under Floor Air Distribution System And Energy Consumption Analysis

Each kind of air distribution mode used in Natatorium has its merits and demerits. It has significant influence on thermal environment and system energy consumptions. However,there is no strict stepulation on which mode should be used in the HVAC system design of recreational natatorium.Therefore,a recreational natatorium in Shanghai with underfloor air distribution system was chosen to be the study object.Firstly,CFD simulation technology was used to simulate the indoor thermal environment of the natatorium with underfloor air distribution system and with upper supply air distribution system under winter and summer conditions.It indicates upper supply air distribution system can produce comparatively better indoor thermal environment.However,optimizing supply air parameters of underfloor air distribution system can improve the indoor thermal condition and strengthen its dehumidification effect.Then,with the indoor temperature obtained from simulation,the analysis on the whole building energy consumption with the two different air distribution systems was conducted by using the software, Energyplus.Results show that the energy consumption of the underfloor air supply system is significantly lower than that of the other mode.And then,the influence of solar heat gain coefficient(SHGC),fresh air ratio,coefficient of performance(COP) of the chillers on the annual energy consumption of the building were also calculated.It reveals that the fresh air ratio and COP have manifest influence on building energy consumption.Using return air in winter and summer reasonably while using full fresh air in transitional season may greatly reduce the energy consumption of HVAC system. Especially in winter,it can save about 50%of gas consumption.Improving the value of COP from 3.5 to 5.5,the annual electricity consumption may reduce by 21.2%.