Research On The Characteristics Of Temperature And Fluid Field In Winter Working Conidtion Of Building With Selective Solar Tunnel Wall

In order to solve the current energy crisis, more and more attentions has been paid to realize solar building integration, which can reduce building energy consumption. This thesis introduces a new type of passive solar building, named selective solar tunnel(SST) wall solar building. With the SST’s particular geometric features, SST Wall can absorb the sunlight selectively according to the variant solar angle to heat the house in winter and avoid high indoor temperature in summer.This thesis is to explore the influence of SST Wall installed in the existing buildings and summarize the SST Wall’s application value. A house with SST Wall and a reference house without are firstly built in the experimental system; then writer continuously records the temperature, humidity, human comfort index and power consumption under different conditions and different operation modes for over 1 month; at last, a detailed analysis of thermal environment at day or night, under natural or forced ventilation modes is finished.The comparison results as follows: 1) the most comfortable and energy-saving indoor design temperature is 20 degree; 2) the indoor temperature rises obviously and human may feel overheated at noon in the operation mode of forced ventilation; however, under the similar environment conditons, the indoor temperature change is small, and human comfort is better in the operation mode of natural ventilation. Surprisingly, the latter’s building energy efficiency is higher.For the purpose of further research on the characteristics of temperature and fluid field in SST Wall house, the numerical models of forced ventilation and natural ventilation modes are established, using CFD/FLUENT with experimental data as boundary conditions. The simulated results show the indoor average temperature is around 21 degree and temperature distribution is inhomogeneous in natural ventilation, but in forced ventilation, the average temperature indoor is 4 degree above the former, and temperature field is very uniform, which complies with the experiment results. Then using the accurate numerical models, the SST Wall building’s design is optimized preliminarily and some suggestions are giving, e.g. 1) the installation height of vent should be smaller; 2) the most energy-saving operation is natural ventilation combined with forced ventilation, to maximize their owner advantages; 3) heat storage walls should be used in SST Wall building, or embedding photovoltaic cells in SST side fascia is preferred, which can drop the energy consumption of heating at night.In conclusion, detailed analysis of the experimental and simulated results show SST Wall can build a comfortable indoor environment to occupants and bring significant energy-saving effect to existing buildings.