严寒地区保温型塑料大棚土壤蓄放热特性
S625; 土壤温度及蓄放热特性是保温型塑料大棚土壤传热特性的重要体现.因此,为定性、定量地阐明棚内土壤温度变化规律和蓄放热特性,在严寒地区生产性大棚内进行了试验测试,并通过构建大棚土壤热量平衡简化方程、温差拟合等方法对土壤蓄放热特性进行了理论分析.研究结果表明:1)土壤温度波幅随深度的增加呈乘幂函数递减,通过计算得出测试地区大棚土壤的蓄热层平均厚度约为0.55～0.80 m;2)棚内土壤横向地中传热损失占土壤总热损失的9.8％～24.7％,若将此部分热量用于提高土壤温度,则棚内土壤平均温度可提高0.3～0.5℃;3)天气条件对土壤蓄放热性能的影响较大:晴天日累积蓄热量比多云天多37.2％～5...
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| Published in | 农业工程学报 Vol. 38; no. 3; pp. 189 - 196 |
|---|---|
| Main Authors | , , , , , |
| Format | Journal Article |
| Language | Chinese |
| Published |
中国农业大学水利与土木工程学院,北京 100083%农业农村部设施农业工程重点实验室,北京 100083
01.02.2022
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| Subjects | |
| Online Access | Get full text |
| ISSN | 1002-6819 |
| DOI | 10.11975/j.issn.1002-6819.2022.03.022 |
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| Abstract | S625; 土壤温度及蓄放热特性是保温型塑料大棚土壤传热特性的重要体现.因此,为定性、定量地阐明棚内土壤温度变化规律和蓄放热特性,在严寒地区生产性大棚内进行了试验测试,并通过构建大棚土壤热量平衡简化方程、温差拟合等方法对土壤蓄放热特性进行了理论分析.研究结果表明:1)土壤温度波幅随深度的增加呈乘幂函数递减,通过计算得出测试地区大棚土壤的蓄热层平均厚度约为0.55～0.80 m;2)棚内土壤横向地中传热损失占土壤总热损失的9.8％～24.7％,若将此部分热量用于提高土壤温度,则棚内土壤平均温度可提高0.3～0.5℃;3)天气条件对土壤蓄放热性能的影响较大:晴天日累积蓄热量比多云天多37.2％～50.6％左右,日累积放热量比多云天多44.7％～64.3％;晴天的最大蓄热流量和日累积蓄热量均是阴天的4倍以上,与蓄热性能相比,晴天与阴天的土壤放热性能差异较小.土壤蓄放热量主要受表层土壤与气温温差的影响,棚内外气温差对其影响较小. |
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| AbstractList | S625; 土壤温度及蓄放热特性是保温型塑料大棚土壤传热特性的重要体现.因此,为定性、定量地阐明棚内土壤温度变化规律和蓄放热特性,在严寒地区生产性大棚内进行了试验测试,并通过构建大棚土壤热量平衡简化方程、温差拟合等方法对土壤蓄放热特性进行了理论分析.研究结果表明:1)土壤温度波幅随深度的增加呈乘幂函数递减,通过计算得出测试地区大棚土壤的蓄热层平均厚度约为0.55～0.80 m;2)棚内土壤横向地中传热损失占土壤总热损失的9.8％～24.7％,若将此部分热量用于提高土壤温度,则棚内土壤平均温度可提高0.3～0.5℃;3)天气条件对土壤蓄放热性能的影响较大:晴天日累积蓄热量比多云天多37.2％～50.6％左右,日累积放热量比多云天多44.7％～64.3％;晴天的最大蓄热流量和日累积蓄热量均是阴天的4倍以上,与蓄热性能相比,晴天与阴天的土壤放热性能差异较小.土壤蓄放热量主要受表层土壤与气温温差的影响,棚内外气温差对其影响较小. |
| Author | 宋卫堂 田东坤 梁超 赵淑梅 程杰宇 王平智 |
| AuthorAffiliation | 中国农业大学水利与土木工程学院,北京 100083%农业农村部设施农业工程重点实验室,北京 100083 |
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| Author_FL | Cheng Jieyu Song Weitang Liang Chao Zhao Shumei Tian Dongkun Wang Pingzhi |
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| Keywords | 土壤;温度;保温型大棚;蓄热层厚度;热量平衡估算方程;热损失;蓄放热特性 |
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