Study On Thermal Performance Of A Novel Designed Solar Wall

With the rapid development of economy and the gradual improvement of living standard,the contradiction between building energy consumption and energy supply is increasingly prominent.As the most important part of building energy consumption in northern China,heating energy consumption is particularly significant for energy-saving and emission-reduction technology.Solar energy is a kind of abundant and clean renewable energy,which not only abandons the shortcomings of the traditional way of energy shortage and environmental pollution,but also has the advantages of practicality and availability.As a kind of solar energy utilization technology,the solar wall system can be passive absorption of solar energy for building supply.It is a better economical building heating method with low energy consumption.In view of the fact that the existing solar wall structure has the problem of slowheating in daytime and heat dissipating at night,a novel solar wall structure with a collector plate in the flow cavity was proposed.A thermal performance experiment table for the novel designed solar wall system was set up to monitor the heat collector plate,air interlayer and indoor temperature,and also the outdoor environmental parameters during the test were recorded.The temperature distribution,the indoor thermal environment and the heat exchange rate of the new system were analyzed by the data obtained from the experiment.It was found that the new system can quickly transport the heat to the room.The maximum temperature rising rate in the room was 3.2?/h,and the temperature difference between the experimental room and the contrast room was up to 3.4 ?.The difference between the average temperature of the experimental room and the outdoor was 11.0 ?.On the basis of the experimental test,the physical model of the traditional solar wall system and the new solar wall system was established.The reliability of the model was verified by experimental data.It was found that the new system is more efficient than the traditional system and has better insulation performance at night.The influence of emittance,absorbency,air interlayer thickness and outdoor environment on the heat performance of the solar wall system was analyzed by simulation.The results showed that the decrease of the emissivity,the increase of absorbency,the increase of the solar radiation intensity and the outdoor temperature can improve the efficiency of the system.The research work in this paper will provide a new idea for the winter heating in northern buildings and provide a useful reference for the performance optimization and structural comparison of the solar wall system.It also provides technical support for the low energy consumption transformation of existing residential buildings in the northern area to use the solar wall system.