Greenhouse Covering Material Overall Heat-transfer Coefficient Determination Using Contour Plots
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...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Society for Horticultural Science (ASHS)
2025-01-01
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| Series: | HortScience |
| Subjects: | |
| Online Access: | https://journals.ashs.org/hortsci/view/journals/hortsci/60/2/article-p235.xml |
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| Summary: | 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. |
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| ISSN: | 2327-9834 |