基于热平衡理论的隔热涂料夏季节能效果模拟与分析
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摘要
根据热平衡理论建立了围护结构稳态传热模型,计算隔热涂料对围护结构传热的影响。结果表明,夏季反射隔热涂料在白天降低围护结构传热量的效果更优异,夜晚节能效果会有所降低;辐射型隔热涂料能够在昼夜稳定地降低围护结构传热量。此外,对北方地区应用隔热涂料后室内温度和空调能耗情况进行了动态模拟。建筑模型能耗模拟表明,应用反射型隔热涂料(以反射比0.7为例)后,夏季室内温度与对照组相比降低0.47～0.69℃,整个夏季空调能耗降低17.60%;应用辐射型隔热涂料(以发射率0.9为例)后,夏季建筑室内温度降低0.45～0.51℃,整个夏季空调能耗降低14.60%。
A steady-state heat transfer model of envelope is established based on heat balance theory to calculate the influence of heat-insulating coatings on heat transfer of envelope. The results show that the reflective heat insulation coating can reduce the heat transfer of the envelope to a greater extent during the summer daytime,but the energy-saving effect at night is reduced. radiation-type insulation coatings can reduce the heat transfer of the envelope during the day and night. In addition,this paper makes dynamic simulation of the indoor temperature and energy consumption of air conditioning system after applying thermal insulation coatings in northern China. The simulation results show that the reflective heat insulation coating can reduce the indoor temperature by 0.47～0.69 ℃ in summer and the energy consumption of air conditioning by 17.60% in summer. The indoor temperature is reduced by 0.45～0.51 ℃ in summer and the energy saving was 14.60% in summer after radiation-type insulation coatings is applied.
A steady-state heat transfer model of envelope is established based on heat balance theory to calculate the influence of heat-insulating coatings on heat transfer of envelope. The results show that the reflective heat insulation coating can reduce the heat transfer of the envelope to a greater extent during the summer daytime,but the energy-saving effect at night is reduced. radiation-type insulation coatings can reduce the heat transfer of the envelope during the day and night. In addition,this paper makes dynamic simulation of the indoor temperature and energy consumption of air conditioning system after applying thermal insulation coatings in northern China. The simulation results show that the reflective heat insulation coating can reduce the indoor temperature by 0.47～0.69 ℃ in summer and the energy consumption of air conditioning by 17.60% in summer. The indoor temperature is reduced by 0.45～0.51 ℃ in summer and the energy saving was 14.60% in summer after radiation-type insulation coatings is applied.
引文
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[2] Akbari H.Cooling our communities:a guidebook on tree planting and light-colored surfacing[M].Lawrence Berkeley National Laboratory,1992.
[3] Bansal N K,Garg S N,Kothari S.Effect of exterior surface colour on the thermal performance of buildings[J].Building&Environment,1992,27(1):31-37.
[4] Akridge J M.High-albedo roof coatings-impact on energy consumption[J].Ashrae Transactions,1998,104:957-962.
[5] Cheng V,Ng E,Givoni B.Effect of envelope colour and thermal mass on indoor temperatures in hot humid climate[J].Solar Energy,2005,78(4):528-534.
[6] Cheung C K,Fuller R J,Luther M B.Energy-efficient envelope design for high-rise apartments[J].Energy&Buildings,2005,37(1):37-48.
[7] Hui S,Tan H,Tzempelikos A.The effect of reflective coatings on building surface temperatures, indoor environment and energy consumption-An experimental study[J].Energy&Buildings,2011,43(2):573-580.
[8] Synnefa A,Santamouris M,Livada I.A study of the thermal performance of reflective coatings for the urban environment[J].Solar Energy,2006,80(8):968-981.
[9] Guo W,Qiao X,Huang Y,et al. Study on energy saving effect of heat-reflective insulation coating on envelopes in the hot summer and cold Winter zone[J].Energy&Buildings,2012,50(7):196-203.
[10]汤小敏.冷屋顶对重庆办公建筑能耗及碳排放的影响研究[D].重庆:重庆大学,2013.
[11]江飞飞.热反射屋面隔热和节能效果对比测试研究[J].墙材革新与建筑节能,2012(3):45-48.
[12] Levinson R,Berdahl P,Berhe A A,et al.Effects of soiling and cleaning on the reflectance and solar heat gain of a light-colored roofing membrane[J].Atmospheric Environment,2005,39(40):7807-7824.
[13] Akbari H.Measured energy savings from the application of reflective roofs in two small non-residential buildings[J].Energy,2003,28(9):953-967.
[14] Pisello A L,Santamouris M,Cotana F.Active cool roof effect:impact of cool roofs on cooling system efficiency[J].Advances in Building Energy Research,2013,7(2):209-221.
[15] Saafi K,Daouas N.A life-cycle cost analysis for an optimum combination of cool coating and thermal insulation of residential building roofs in Tunisia[J].Energy,2018,152:925-938.
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