Experimental Study On Floor Heating And Cooling Air-conditioning Systems In Summer For Residential Buildings And Development Of Simulation Programs

With development of the economy and the people's living level, people's resident environment in our country has improved in a large scale. At the same time, people bring forward higher demand on the comfort of interior environment. Traditional heating and cooling modes have some disadvantages, such as low efficiency of energy utilization, low heat comfort and polluting environment, so they can't fit with modern residential buildings. This paper presents a feasible technique-─floor radiation heating and cooling system (or heating and cooling floor) + air-conditioning system dealing with fresh air. This air-conditioning mode can simultaneously satisfy winter's heating and summer's cooling. It is much better in comfort and energy efficiency, and it should be the first chose to residential buildings.There have many studies in the floor radiation heating system in and out our country, and in the northern of our country it has been installed and used in some residential buildings. Through the practice it has been proved that the floor radiation heating system is a high efficient, beautiful and comfort heating mode. But there has little study in the floor radiation cooling system combining with air-conditioning system dealing with fresh air. The author measured the feasibility and some technical parameters of the floor radiation cooling system combining with fresh air dealing system in a residential building of hot summer and cold winter zone mainly through experiment. And the paper analyzed three air-conditioning modes of the floor cooling system, fan and coiling pipes system and the combination system of the former two systems by temperature field, velocity field, heating and humidity conditions indoors and the factors which affect the heat exchange of floor, such as dewing, water supply temperature and floor surface dress. After the analysis, the author found that the combination system of the floor radiation cooling system and the fan and coiling pipes air-conditioning system entirely fits with residential buildings in hot summer and cold winter zone. In addition, by using the classical theories of heat transfer and after reasonable supposition and simplifying, the paper resolved the coupling equation group which consists of unsteady heat transfer equations of inner floor and node's heat-net equations of room's surfaces established by response factor method and established integrated dynamic math model of the heating and cooling floor. Based on the model,the author developed the heating and cooling floor's dynamic simulation software－FHC. Using the software, the paper simulated the floor cooling system and analyzed the affecting factors to optimize the floor cooling system.