Research Of Thermal Characteristic Of Glazing Curtain Wall With Thermal Channel And Energy Consumption Evaluation

One side of thermal channel is provided with single glass covers which with the hollow glass of the channel form a channel which the heated air could raise and flow by natural ventilation. Openings provided at bottom and top of the channel allow hot air to enter and leave the channel and induce to hot air expel form channel. In this paper , the theory of energy conservation of thermal channel is briefed and a simple mathematical model and physical thermal calculating model of a double skin facades is proposed .Using a thermal resistance network express the channel transferring procession. Steady state heat transfer equations are set up to determine the boundary temperature. Research indicates each pane surface temperature is gradually fallen from the former to the latter. Therefore lowered envelop surface temperature and reduced transfer of difference in temperature. When solar radiation intensity is 500 W/m~2,outdoor circumstance temperature is 308K(37 ℃ ) and size of double skin facades standard cell is height L=4m, breath W= 1.65m, thickness D=0.25m, the calculated result is obtained: the former singleglass temperature is 313K(40°C) and the latter hollow glass temperature .is 306.5K(33.5°C). When no considering blinds, its transfer coefficient is 1.27W/m2K and cut down % than hollow glass (2.05 W/m2K) and its transmission (0.307) cut down 19% than hollow glass (0.37).In hot summer areas, blinds are situated in the cavity of the double skin facades is inevitable and it could protect the building form the solar heats! Satisfactory data are obtained by using Window5.2 and Matlab software and results indicates in summer double skin facades with blinds could cut down the average temperature of curtain wall inside cover and lower gaining load by way of solar radiation. Compared with no situated blinds curtain, situated blinds curtain could notably lower transfer coefficient and transmission load. Its transfer coefficient could cut down 1.16~1.17W/m2K and its transmission cut down 0.16. Blinds are situated in cavity of double skin facades caused thermal channel average radiation level higher than no situated blinds, this is its disadvantage.In winter, the intermediate cavity functions basically as a thermal buffer zone that provides passive heat gain from solar energy. By using Window5.2 and comparing with single curtain, hollow curtain and double skin facades, results indicates double skin facades could marked heighten envelop inner surface temperature. When solar radiation intensity is 300W/m2 and outdoor circumstance temperature is 269K,inner glass of double skin facades is 297.5K, hollow glass curtain is 285K, single glass curtain is 277.5K. From the mechanism of how the air layer conducts heat in winter, author have formulated a theoretical solution on the resistance of the sealed air layer, which proves theoretically the characteristic of the maximum thermal resistance of the air layer (0.2\2mzK/W ) and optimized thickness(D=54mm). At the same time, the influence of the glass properties on the performance of doubled-glazed has been studies.Additionally, the casements in the inner skin can be opened to the cavity in high-rise building that is exposed to severe wind pressure and heat pressure. These facilities ensure natural ventilation and night-time cooling of the building and thus reduce energy consumption need for running conditioning systems. Glazing certain wall with thermal channel situated blinds induce air qualities has been calculated: when solar radiation intensity is 500W/m2 and outdoor circumstance temperature is 305K, standard cell curtain induce air volume is 0.38Kg/s.At last, author prospect application foreground of the double skin and bring forward concept of zoology curtain and its important format—double skin facades with plant. Supposed that blinds were replaced by plant will obtain even more thermal characteristics. A basic study have been offered to hope the paper could as a reference fordesign, construction, management, and its development.