Simulation Research On A Novel Solar Wall System

At present, energy consumed in buildings account for30percent of the total energyconsumption in our country. If things continue this way, it will seriously affect the sustainableeconomic development of China. Therefore, we must proceed from the sustainabledevelopment strategy and reduce the consumption of non-renewable energy of buildings asfar as possible. As a kind of inexhaustible green energy, solar energy has many incomparableadvantages over conventional energy. Solar collector wall is one form of building envelopewhich can collect heat by making the most of solar energy and has great value andsignificance.In this paper, a new kind of solar collector wall system which mainly consists ofadjustable solar panels shading devices and orifice plate solar collector wall was designed.Solar panels were connected with the direct current fan which located at the inlet of the orificeplate solar collector wall and provided power for the fan. A model of adjustable solar panelsshading devices was made and the formula of air quantity of the solar panels and DC fan wasproposed based on the horizontal shading theory. Established the physical model of the orificeplate solar collector wall with new designed structural style and carried on theoretical analysisto heat transfer processes of the orifice plate solar collector wall and its heating rooms basedon the simplified physical model and heat transfer theory.Based on the theoretical analysis to heat transfer processes, numerical simulation of theorifice plate solar collector wall and its heating rooms under steady and non-steady state werecarried out by Fluent and the distributions and time histories of the temperature and velocitywere obtained. In this paper, under the simulated climatic condition, orifice plate solarcollector wall with the natural situation(without fan) could promote the inlet temperature from289.15K to322.88K and the average temperature of the heating rooms which using orificeplate solar collector wall with natural condition could reach to287.65K. During the simulatedwinter time, the outlet average temperature of the orifice plate solar collector wall with theaction of DC fan reached to the highest--298.7K at13. At this time, the heat collectingefficiency of the orifice plate solar collector wall was86%and the average temperature of theheating rooms using the orifice plate solar collector wall with the action of DC fan was about2℃higher than the average temperature of the contrast rooms overall. During the simulatedsummer time, the orifice plate solar collector wall with the action of DC fan could makebetter ventilation for its rooms and the maximum ventilation volume can reach to342m3/h.Based on the numerical simulation results, the energy-saving performance of the orificeplate solar collector wall with the action of DC fan was carried out. The result revealed thatduring the simulated time, the total heat supplied by the orifice plate solar collector wall forindoor rooms was15073.2KJ. It has a significant effect to reduce the energy consumption ofbuildings.