The Research Of The Air Distribution Of The Thermal Duct Of "the Box-type " DSF In Summer

The glass curtain wall for buildings is a newly structural form of exterior enclosure wall. The double-skin facade (DSF) has remarkable superiority in decreasing energy consumption, improving air quality and reducing noise etc. Compared with the conventional single-skin facade, especially the"box-type"DSF is widely used in high-grade office buildings ,which could reduce noise and improve air quality.In the paper, based on the air-flow distribution in DSF's heat passages, the DSF is classified. It is respectively elaborated the characteristics of heat transfer and energy saving of the"box-type"DSF in winter and in summer in Shenyang and the advantages such as day lighting, noise isolation, fire prevention and improvement of air quality in heat passages etc. According to the theory of FLUENT numerical simulation, the RNG k-εturbulence model and the irradiation model are used to simulate the air distribution of the natural convection in heat passages by taking the incompressible fluid as medium. The influencing factors causing the stack effect in heat passages are analyzed. the sizes of air inlet, air outlet and the range interval between heat passages are optimized for discharging the more heat quantity. Moreover, in view of two different solar illuminations facing the south and the west in Shenyang's summer season, the paper reveals the rule which the heat exhaust out of heat passages of various structural"box-type"DSF will vary with the solar illumination, and the rule which the different height vertical shafts effect on the air-flow distribution in heat passages by comparing the"box-type"DSF with"shaft-box-type"DSF.The air-flow distribution in heat passages of"box-type"DSF of over 60 operating modes is simulated and analyzed, that the unit body size is 3m-4m,the air inlet size is 0.6 m-0.6 m, 0.4 m-0.2 m, and 0.2 m-0.2 m, the heat-passage's width is 0.2 m, 0.4 m, and 0.6 m, and the building orientation is westward or southward. From the numerical simulation, the optimizing structure of the"box-type"DSF is got. The air inlet size of the southward DSF is 0.6 m-0.6 m and the heat-passage's width is 0.4 m. The air inlet size of the westward DSF is 0.6 m-0.6 m and the heat-passage's width is 0.6 m, which considering the solar illustration is the most maximal and the most unfavorable in the whole day.The air-flow distribution in heat channels of"shaft-box-type"DSF is simulated and analyzed, that the air inlet size is 0.6 m-0.6 m, 0.4 m-0.2 m, and 0.2 m-0.2 m, the heat-channel's width is 0.2 m, 0.4 m, and 0.6 m, and the height of the vertical shafts is different. From the numerical simulation, the optimizing structure of the"box-type"DSF is got. The air inlet size of the southward DSF is 0.6 m-0.6 m and the heat-channel's width is 0.4 m. The air inlet size of the westward DSF is 0.6 m-0.6 m and the heat-channel's width is 0.6 m, which considering the solar illustration is the most maximal in the whole day. The 0.6 m heat-channel's width is selected for discharging the more heat of box body.