内部真空度对真空绝热板导热系数的影响
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摘要
真空绝热板板内真空度是影响真空绝热板绝热性能的关键因素之一,通过合理地降低板内真空度以降低板内残余气体引起的导热,继而以维持其较低的导热系数。在真空绝热板芯材内部埋置微型压力传感器,通过测量板内残余气体压力变化,检测真空绝热板内的真空度,并结合大平板导热仪,获取对应压力下的真空绝热板导热系数。通过实验和理论模型计算得到板内真空度与真空绝热板绝热性的关系,以及得到真空绝热板板内真空度与导热系数的最佳组合。
Vacuum in the vacuum insulation panel is one of the key factors affecting the thermal insulation performance of the vacuum insulation panel. By reasonably reducing the vacuum inside the panel to reduce the heat conduction caused by the residual gas in the panel, the lower thermal conductivity is maintained. In this paper, a miniature pressure sensor was embedded inside the core material of the vacuum insulation board. By measuring the change of residual gas pressure in the panel, the vacuum degree in the vacuum insulation panel was detected, and the thermal conductivity of the vacuum insulation panel under the corresponding pressure was obtained by combining the large plate heat conduction meter. Through the experimental and theoretical models, the relationship between the vacuum degree of the panel and the thermal insulation of the vacuum insulation pane lwas obtained, and the optimal combination of vacuum degree and thermal conductivity in the vacuum insulation panel was obtained.
Vacuum in the vacuum insulation panel is one of the key factors affecting the thermal insulation performance of the vacuum insulation panel. By reasonably reducing the vacuum inside the panel to reduce the heat conduction caused by the residual gas in the panel, the lower thermal conductivity is maintained. In this paper, a miniature pressure sensor was embedded inside the core material of the vacuum insulation board. By measuring the change of residual gas pressure in the panel, the vacuum degree in the vacuum insulation panel was detected, and the thermal conductivity of the vacuum insulation panel under the corresponding pressure was obtained by combining the large plate heat conduction meter. Through the experimental and theoretical models, the relationship between the vacuum degree of the panel and the thermal insulation of the vacuum insulation pane lwas obtained, and the optimal combination of vacuum degree and thermal conductivity in the vacuum insulation panel was obtained.
引文
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[14] COLLISHAW P G,EVANS J R G. An assessment of expressions for the apparent thermal conductivity of cellular materials[J]. Material Science,1994,29:486-498.
[15] BOUQUEREL M. DUFORESTEL T. BAILLIS D. RUSAOUEN G. Heat transfer modeling in vacuum insulation panels containing nanoporous silicas-a review[J]. Energy and Buildings,2012,54: 320-336.
[2] FRICKE J,SCHWAB H,HEINEMANN U. Vacuum insulation panels –exciting thermal properties and most challenging application[J]. International Journal of Thermal physics,2006,27(4):1123-1139.
[3] SIMMLER H,BRUNNER S. Vacuum insulation panels for building application basic properties,aging mechanisms and services life[J]. Energy and Buildings,2005,37:122-1131.
[4] LI C D, CHEN Z F, BOAFO F E,et al. Determination of optimum drying condition of VIP core material by wet method[J]. Dry Technology,2013a,31:1084-1090.
[5] Li C D, DUAN Z C, Chen Q, et al. The effective of drying condition of glass fiber core material on the thermal conductivity of vacuum insulation panel[J]. Materials and Design,2013b,50:1030-1037.
[6] YANG C G, LI Y J, GAO X,et al. A review of vacuum degradation research and the experimental outgassing research of the core material-PU foam on vacuum insulation panels[J]. Physics Procedia,2012,32:239-244.
[7] DI X, GAO Y, BAO C,et al. Optimization of glass fiber based core materials for vacuum insulation panels with laminated aluminum foils as envelopes[J]. Vacuum,2013,97:55-59.
[8] REIM M,KORNER W, MANARA J, et al. Silica granulate material for thermal insulation and daylighting[J]. Solar Energy, 2005,79:31-139.
[9] WEI Gaosheng ,WANG Lixin ,XU Chao,et al. Thermal conductivity investigations of granular and powdered silica aerogels at different temperatures and pressures[J]. Energy and buildings,2016,118:226-231.
[10] OCHS F,HEIDEMANN W,STEINHAGEN H. Effective thermal conductivity of moistened insulation materials as a function of temperature[J]. Heat Mass Transfer,2008,51:539-552.
[11] 邸小波,鲍崇高,高义民,谢振刚,胡永年. 真空绝热板导热系数与板内真空度关系研究[J]. 2011,48(3):12-15.
[12] 纪珺,韩厚德,阚安康,梁志强. 真空绝热板的热工性能及其在冷藏集装上的应用. 化工学报[J]. 2008,12:416-420.
[13] ZHAO J,DUAN Y,WANG X, WANG B. Effect of solid-gas coupling and pore and particle microstructure on the effective gaseous thermal conductivity in aerogels[J]. Journal of Nanoparticle Research,2012, 14:1024–1038.
[14] COLLISHAW P G,EVANS J R G. An assessment of expressions for the apparent thermal conductivity of cellular materials[J]. Material Science,1994,29:486-498.
[15] BOUQUEREL M. DUFORESTEL T. BAILLIS D. RUSAOUEN G. Heat transfer modeling in vacuum insulation panels containing nanoporous silicas-a review[J]. Energy and Buildings,2012,54: 320-336.