为研究植物层传热特性，选取校园内十种常见园林植物测定其叶片导热系数、叶片与周边空气对流换热系数，拟合导热系数与叶片含水量的近似关系式，对比实验测定对流换热系数与通过经验公式理论计算所得对流换热系数，比较与叶片接触前后空气的相对湿度。结果表明，叶片存在降温增湿作用，在5～25 ℃下叶片导热系数随温度变化较小；叶温20 ℃时，叶片导热系数随叶片含水量降低而减小；实验测试对流换热系数与理论计算结果吻合度较高。
In order to study the heat transfer characteristics of plant layer, this paper selected ten species of common landscape plants on the campus, and determined the thermal conductivity of their leaves, convective heat transfer coefficient between leaves and surrounding air, conducts several experimental measurements and analyses, fit the approximate relationship between thermal conductivity and leaf water content, compare the experimentally determined convective heat transfer coefficient with the convective heat transfer coefficient obtained through theoretical calculation of empirical formula, and compare the relative humidity of air before and after contact with leaves. The results showed that there was a cooling and humidifying effect of the leaves; the thermal conductivity of the blade changed less with temperature at 5 to 25 ℃; When the leaf temperature was 20 ℃, the thermal conductivity of the blade decreased with the reduction of leaf water content; the convective heat transfer coefficient of the experimental test was in high agreement with the theoretical calculation.
[1] Jaffal I, Ouldboukhitine S E, Belarbi R. A comprehensive study of the impact of green roofs on building energy performance[J]. Renewable Energy, 2012, 43: 157–164.
[2] Cascone S, Coma J, Gagliano A, Perez G. The evapotranspiration process in green roofs: A review[J]. Building and Environment, 2019, 147: 337–355.
[3] 龚修齐, 骆天庆. 屋顶绿化缓解城市热岛效应的研究进展[C]. 上海: 中国风景园林学会2019年会论文集, 2019.
[4] 白雷. 种植屋面的热工性能评价指标研究[D]. 重庆: 重庆大学硕士学位论文, 2016.
[5] 徐建业, 杜欢欢, 曾理, 万志美. 屋面绿化隔热一体化技术概述[J]. 绿色建筑, 2015, 7(1): 39–42.
[6] Pérez G, Coma J, Chafer M, Cabeza L F. Seasonal influence of leaf area index (LAI) on the energy performance of a green facade[J]. Building and Environment, 2022, 207: 108497.
[7] 徐晓莹. 植物种植对绿化屋顶热工性能的影响研究[D]. 上海: 东华大学硕士学位论文, 2019.
[8] 王栋. 基于傅里叶定律对热传导的分析[J]. 科学技术创新, 2019(13): 45–46.
[9] Deeths M J, Endrizzi B T, Irvin M L, Steiner L P, Hordinsky M K. Phenotypic analysis of T-cells in extensive alopecia areata scalp suggests partial tolerance[J]. Journal of Investigative Dermatoloy, 2006, 126(2): 366–373.
[10] Fujii T, Imura H. Natural-convection heat transfer from a plate with arbitrary inclination [J]. International Journal of Heat and Mass Transfer, 1972, 15(4): 755–767.
[11] Bellazzi A, Barozzi B, Pollastro M C, Meroni I. Thermal resistance of growing media for green roofs: To what extent does the absence of specific reference values potentially affect the global thermal resistance of the green roof? An experimental example[J]. Journal of Building Engineering, 2020, 28: 101076.
[12] 郑俊波. 无损检测10种植物叶片含水量的通用模型[J]. 浙江农业学报, 2019, 31(10): 1717–1723.
[13] Zhang Z, Lv Y, Pan H. Cooling and humidifying effect of plant communities in subtropical urban parks[J]. Urban Forestry & Urban Greening, 2013, 12(3): 323–329.
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