| With the acceleration of Chinese industrialization and urbanization process and the improvement of people’s living standards,people’s rigid demand for energy is growing rapidly,while the rapid increase in energy consumption has brought carbon dioxide,sulfur dioxide,nitrogen oxides,smoke and dust,etc.The massive discharge of pollutants has led to increasingly serious environmental and ecological problems,which have affected the sustainable development of the economy and society.Under the situation where conventional energy sources are increasingly depleted,the use of renewable energy will inevitably replace some of the conventional energy sources.Under this background,it is particularly important to promote passive energy-efficient buildings with multiple renewable energy sources.At present,experts and scholars at home and abroad have done a lot of research on solar chimney and tunnel wind system respectively,but there are not many researches on the efficient combination of the two.In order to fill in the deficiencies of this research,In this paper,a solar chimney ground pipe coupling system which uses both solar energy and geothermal energy is proposed.The air is preheated / precooled by using the heat storage capacity of the stratum.At the same time,the thermal pressure generated by the solar chimney is used to provide power for the ground pipe fresh air system.On the premise of ensuring the indoor thermal environment quality,the energy consumption of the passive building fresh air system can be greatly reduced and the increasingly severe energy can be alleviated Source and environmental issues.Because the coupling system is a complex heat transfer and ventilation system,which is influenced by the heat exchange of buried pipe and collector,and vice versa,it needs and carries out the research on theoretical analysis,experimental verification and numerical simulation analysis of influencing factors The main work contents are as follows:Firstly,summarize the research results of the existing solar chimney and tunnel wind system from the perspective of theoretical analysis and experimental research.Based on the heat balance method and the Fourier heat conduction differential equation,a steadystate mathematical theoretical model of hot-pressed ventilation of a solar chimney-buried pipe coupling system is established.Then,using the characteristics of the interaction between the two software TRNSYS and MATLAB,a simulation platform for the solar chimney-buried pipe coupling system used in the building was further built,and the solar chimney model and the accuracy and reliability of the buried tube-air heat exchange model were verified.Then,the effects of the key parameters such as the length of the buried pipe,the diameter of the buried pipe,the length of the collector and the height of the chimney on the parameters such as the thermal pressure,the ventilation volume and the air temperature drop of the system are analyzed quantitatively by using the verified simulation platform of the coupling system.Finally,using the ventilation volume of the coupling system and the air temperature at the outlet of the buried pipe as the evaluation indicators,the coupling system is optimized for size,and based on the optimized size structure,the lower limit of the solar radiation intensity that the coupling system meets the indoor thermal environment temperature requirements is further explored And the upper limit of outdoor air temperature.To summarise,the mathematical model of the coupled system proposed in this paper and the optimized size model obtained by simulation provide theoretical basis and technical support for the ventilation design of passive buildings,and are of great significance for promoting the development and utilization of renewable energy and the development of energy-efficient buildings. |
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