Study On Microclimate Optimization Of Sponge Living Street Valley In Xi'an

Street Valley,is the basic building unit of a city,the quality of the hot environment in the street valley,directly related to the comfort of residents,pedestrians and energy consumption of street buildings.With the popularization of the construction of sponge city,more and more street valleys,called sponge street valleys,are formed by the combination of sponge road and street buildings.Because of the different materials of the underlying surface,there are obvious differences between the energy transfer mode of the sponge street valley and the traditional street valley,so it is necessary to study the thermal environment of the sponge life street valley.Firstly,the microclimate difference between sponge-type living street valley and traditional living street valley in winter and summer is summarized through investigation and analysis.Then,the effects of different aspect ratio,street-valley direction and green rate on the micro-climate of street-valley are summarized by single factor analysis method.Finally,the multi-factor optimization method is used to optimize the climate of sponge-type living street valley based on the criterion of the comprehensive comfort time of winter and summer SET in street-valley.Xi'an area,street valley direction is field-shaped,the road mostly uses north-south direction and east-west direction.On this basis,considering winter and summer,winter height and width ratio of sponge life street valley thermal comfort degree is greater than summer;winter street valley direction to sponge life street valley thermal comfort degree is greater than summer;summer road tree green belt to sponge life street valley thermal comfort degree is smaller.The best design scheme of microclimate is 1.76,crown diameter 5m,crown spacing 4m,green coverage 45%;microclimate worst design scheme is 0.28,crown diameter 5m,crown spacing 15 m,green coverage 7%;north-south sponge living street valley,microclimate optimal design scheme is 1.76,crown diameter 5m,crown spacing 4m,green coverage 45%;microclimate worst design scheme is 0.28,crown diameter 5m,crown spacing 15 m,green coverage 7%.The conclusion of this paper can provide theoretical and engineering support for the further promotion of sponge-type street valley in Xi'an and similar climatic zones.