| 摘要: |
| 依据稳态热流平衡原理，采用理论分析和数值迭代的方法建立了考虑玻璃长波辐射透射率和室内外空间环境耦合条件下普通双层中空玻璃的稳态传热模型，并对普通双层中空玻璃在冬季典型室内外气温和空间环境几何边界条件下的总热流密度、总传热系数、有效长波辐射透射系数和内、外表面辐射换热系数进行了计算分析.结果表明:每层普通透明玻璃的长波辐射透射率达到01时，冬季典型室外气温范围（-40~0℃）内双层中空玻璃的有效长波辐射透射系数达到0167~0177，内表面辐射换热系数相比不计玻璃长波辐射透射率时的增大25%左右，外表面辐射换热系数相比不计玻璃长波辐射透射率时的增大10倍以上，玻璃的长波辐射透射作用对双层中空玻璃节能性能的不利影响明显，玻璃的长波辐射透射率在设计与计算时不可忽略.此外，冬季随着室内外气温温差的减小，双层中空玻璃的总热流密度逐渐减小，而总传热系数则逐渐增大，内、外表面辐射换热系数也逐渐增大. |
| 关键词: 双层中空玻璃 节能 长波辐射 热流密度 透射率 |
| DOI：103969/jissn1007 9629201406030 |
| 分类号: |
| 基金项目:国家自然科学基金重点项目（51236003）；甘肃省自然科学基金资助项目（1310RJZA047）；兰州交通大学科技支撑基金资助项目（ZC2014009） |
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| Effects of Long Wave Radiation Transmittance of Glass on Thermal Characteristics of Ordinary Double Hollow Glass |
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WANG Tianpeng1, WANG Liangbi2
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1.School of Architecture and Urban Planning, Lanzhou Jiaotong University, Lanzhou 730070, China;2.School of Mechatronic Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
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| Abstract: |
| According to the theory of steady heat flow balance, adopting the method of theoretical analysis and numerical iteration, a steady heat transfer model of double hollow glass considering long wave radiation transmittance of glass and indoor and outdoor space coupling condition was established. Based on the model, overall heat flux, overall heat transfer coefficient, effective long wave radiation transmission coefficient, radiation heat transfer coefficient of inside and outside surfaces were calculated and analyzed under classic indoor and outdoor air temperatures in winter and geometry boundary conditions of indoor and outdoor environments to double hollow glass composed of ordinary clear glass sheets. The results show that if long wave radiation transmittance of every glass sheet is 01, effective long wave radiation transmission coefficient of double hollow glass will approach to 01670177; comparing to the situation ignoring long wave radiation transmittance of glass, radiation heat transfer coefficient of inside surface of double hollow glass increases about 25%, and radiation heat transfer coefficient of outside surface increases over 1.0 times in classic outdoor air temperature condition(-400℃). So the adverse effects of the long wave radiation transparent of glass on energy saving capability of double hollow glass are obvious, and long wave radiation transmittance of glass cannot be ignored in energy saving design and calculation. Furthermore, with decreasing air temperature difference between indoor and outdoor environments in winter, overall heat flux of double hollow glass decreases gradually, however, overall heat transfer coefficient and radiation heat transfer coefficients of inside surface and outside surface of double hollow glass increase gradually. |
| Key words: double hollow glass saving energy long wave radiation heat flux transmittance |
