Greenhouse Covering Material Overall Heat-transfer Coefficient Determination Using Contour Plots

被引：0
|
作者：
Ohashi, Yuta [1 ]
Tsuchiya, Ryota [1 ]
Ishii, Masahisa [1 ]
Hayashi, Makio [1 ]
机构：
[1] NARO, Inst Rural Engn, Tsukuba, Ibaraki 3058609, Japan
来源：
HORTSCIENCE | 2025年 / 60卷 / 02期
关键词：
decarbonization; energy conservation; glass film; greenhouse; heat insulation; plastic film; THERMAL SCREENS; HOT-BOX;
D O I：
10.21273/HORTSCI18217-24
中图分类号：
S6 [园艺];
学科分类号：
0902 ;
摘要：
Improving greenhouse heat-insulating performance requires covering materials with low overall heat-transfer coefficients. We constructed a contour plot using equations relating this coefficient to longwave radiation absorptance under different outdoor downward longwave radiation levels. It revealed that the coefficient ranged from 4.7 to 7.7 W m(-2) K-1, decreasing with increasing downward longwave radiation and longwave radiation absorptance. This method facilitates rapid estimation of overall heat-transfer coefficients under different downward longwave-radiation levels, based on longwave-radiation absorptance.
引用
收藏
页码：235 / 236
页数：2
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