【摘要】 采用集总参数法研究了几种植物叶片的热时间常数、表面对流换热系数.结果表明:(1)静风条件下,植物叶片符合传热学规律,可以用集总参数法分析其传热特性;(2)叶片热时间常数碧玉为(298±38.9)s,长寿花为(263±40.9)s,绿萝为(108.7±9.9)s,番茄为(75±22.9)s,(3)静风条件下植物叶片的对流换热系数,碧玉为(8.23±2.07)W·m-2·℃-1;长寿花为(8.67±1.66 W·m-2·℃-1;绿萝为(7.06±2.43)W·m-2·℃-1;番茄为(6.8±1.34)W·m-2·℃-1.(4)热时间常数与叶片厚度有较明显的关系,二者线性回归方程为τ=137.23TH+44.92,在0.01信度下通过检验,叶片越厚,热时间常数越大.更多还原

【Abstract】 The heat physical characteristics,convection coefficient of tomato and other plants were studied using lumped parameter method. The results showed:( 1) on condition of static wind plant leaf conformed to heat transfer law and lumped parameter method could be used to analyze the character of heat transfer;( 2) the heat time constant( τ) of tomato leaf was( 75 ± 22. 9) s,winter pot kalanchoe was( 263 ± 40. 9) s; Peperomia tetraphylla was( 298 ± 38. 9) s; Araceae was( 108. 7 ± 9. 9) s;( 3)on the condition of static wind,the convection coefficient of tomato leaf was( 6. 8 ± 1. 34) W ·m- 2·℃- 1,that of winter pot kalanchoe was( 8.67 ±1.66) W·m- 2·℃- 1,of Peperomia tetraphylla was( 8. 23 ± 2. 07) W·m- 2·℃- 1,that of Araceae was( 7.06 ±2.43) W·m- 2·℃- 1;( 4)there was clear relation between the heat time constant of plants and thickness( TH) of plant leaves,the regression equation of which was τ = 137. 23 TH + 44. 92,and passed through the significant test at0. 01 reliability.更多还原