【作者】 佟国红； David M.Christopher； 于威； 赵荣飞；

【Author】 Tong Guohong1,David M Christopher2,Yu Wei1,Zhao Rongfei1(1.College of Water Conservancy,Shenyang Agricultural University,Shenyang 110866,China;2.Department of Thermal Energy Engineering,Tsinghua University,Beijing 100084,China;)

【机构】 沈阳农业大学水利学院； 清华大学热能工程系；

【摘要】 日光温室墙体的不同组合影响墙体的蓄热和保温性能。本研究以实际温室墙体及600mm厚模拟墙体(480mm厚砖墙、120mm厚苯板)为研究对象,分析绝热层位置变化对墙体热性能的影响,其中模拟墙体将120mm厚苯板分为均等的一层、二层及三层并置于480mm厚砖墙的不同位置,共19个方案。研究结果表明绝热层位置不同对墙内温度分布及墙体放热量有明显的影响;模拟墙体研究结果显示只有一层苯板且此苯板放在墙体外侧的方案蓄热和保温性能最好,而放在内侧在所有方案中蓄热和保温性能最差,在22:00,两墙体方案的平均温度相差7.8℃,夜间向室外的放热量相差378.4W/m2;研究结果还表明,三层苯板的方案之间,各墙体内温度差异最小,而一层苯板的方案之间,各墙体内温度差异最大。本研究结果与试验测试结果结论一致,可为温室墙体优化设计提供参考。更多还原

【Abstract】 Location and distribution of insulation in a wall play an important role in heat conservation for Chinese solar greenhouses.An actual greenhouse wall and a simulated 600 mm thick wall built of a 480 mm thick brick wall and a 120 mm thick insulation were used in this study to analysis thermal properties of walls.Nineteen simulated wall configurations containing one,two and three insulation layers were considered while the brick wall thickness and the total insulation thickness were kept constant.Results showed that insulation locations influenced the wall temperature distribution and heat release from wall outside surface obviously.When all configurations were evaluated together,the best result was obtained in the case where one piece of insulation was placed in the outdoor surface of wall with the average wall temperature difference for the best and the worst,in which one piece of insulation was placed in the indoor surface of wall,at 22:00 about 7.8℃ with heat release difference during night more than 378.4 W/m2.The results also showed that wall temperature differences were small among three piece insulation configurations rather than one piece insulation configurations.The results agreed well with existing experimental results and can be used to to select wall configurations.更多还原