| Glass curtain wall technology is gradually being widely used in building as thedevelopment of building envelope technology and people’s requirement for beautifulappearance of building envelope. But this technology increases the building energyconsumption, especially in hot-summer zones. For example, in hot-summer andcold-winter zones of China, glass curtain wall technology increases the energyconsumption of air conditioning system in summer, which made building total energyconsumption incresese greatly. Ventilated double-skin fa ade (VDSF) is a newtechnology of glass curtain wall with advantages of heat insulation in summer andwinter. The annual energy consumption of Typical Meteorological Year of thetraditional glass curtain wall, VDSF and the wall with a glass window in hot-summerand cold-winter zones was simulation calculated in this paper. And then thecalculation results was compared and analyzed, energy saving effect of VDSF appliedin hot-summer and cold-winter zones was discussed. The work will providetheoretical basis for popularization and application of VDSF in the zones. The detailsof this paper are as follows:Firstly, the meteorological data researched and developed jointly by ChinaMeteorological Administration and Tsinghua University was combined with thecalculation model of solar radiation intensity received by building envelope. By usingthis method, the hourly solar radiation intensity received by bu ilding envelope ofbuildings in hot-summer and cold-winter zones can be calculated in each day ofTypical Meteorological Year.Secondly, the summer optical performance parameters of VDSF were calculatedby using shooting and bouncing rays, the summer heat transfer model of VDSF wasestablished by employing improved zone model. The heat transfer model wascombined with solar radiation intensity calculation. By using this method, the indoortotal heat gain of buildings with VDSF under summer conditions can be calculated.Thirdly, the winter optical performance parameters of VDSF were calculated byusing “Equivalence Method” proposed in the paper. And then the natural convectionmodel of vertical-cavity was applied to airtight air cavity of VDSF winter model, thewinter heat transfer model of VDSF was established by employing improved zonemodel. The optical model, the cavity air distribution model and heat transfer model were combined with solar radiation intensity calculation. By using this method, theVDSF’s annual energy consumption of Typical Meteorological Year of fiverepresentative cities (Changsha, Wuhan, Chongqing, Nanjing, Shanghai) inhot-summer and cold-winter zones were simulation calculated separately.Meanwhile, the single-layer glass heat transfer calculation model provided byBuildings Thermal Process and the wall heat transfer calculation model provided byAir Conditioning were combined with solar radiation intensity calculation. By usingthe method, the Typical Meteorological Year annual energy consumption of threetypes of single-layer glass curtain wall, two kinds of hollow glass curtain wall andtwo kinds of wall with a glass window of buildings were simulation calculatedseparately.Finally, the annual energy consumption calculation results of VDSF, single-layerglass curtain wall, hollow glass curtain wall and wall with a glass window in fivecities were compared separately. Through the comparison and analysis of the results,several suggestions about application of glass curtain wall technology in hot-summerand cold-winter zones were given. The results of this paper showed that: camparedwith the traditional glass curtain wall in hot-summer and cold-winter zones, theenergy saving of VDSF with a sunshade was resultful in summer, and the energyconsumption of VDSF and hollow glass curtain wall was comparative in winter. Fromthe point of view of annual energy consumption, the energy saving of VDSF waseffective. Annual energy consumption of VDSF and wall with a glass window wascomparative. So it was deserved to make further research and promotion about VDSFtechnology. |
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