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Effects of convection heat transfer on Sunagoke moss green roof: A laboratory study

机译：对流换热对Sunagoke苔藓绿色屋顶的影响：室内研究

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摘要

The application of green roof has been encouraged to mitigate urban heat island occurrence and to provide ecosystem services in urban areas since a few decades ago. Because very few literature on the usage of moss in green roof implementation is available, this paper introduces the thermal performance of Sunagoke (Racomitrium Canescens) moss green roof in addressing urban heat island effect. In addition, the insights of evaporation cooling on Sunagoke moss are also discussed. The experiments were performed inside the Artificial Climate Chamber with the ambient temperature and humidity set to 30 C and 70% RH, respectively, to simulate a typical summer environment in Japan. The effects of convection heat transfer by means of wind velocity and irradiance were tested on a dry Sunagoke model house, a moist Sunagoke model house, and a control model house. By altering the wind velocity from 0 to 3 m/s, the convection heat was found to dominate the entire heat transfer in dry roof surfaces that lack evaporation (dry Sunagoke and control model house). In contrast, for the whole heat transfer process, the latent heat of moist Sunagoke green roof governed and diverted 70% by no-wind convection and 91% by wind-induced convection. The latent and convection heat of moist Sunagoke green roof were clarified to have inverse correlation to each other, and the diversion rose upon reaching wind-induced convection state. In terms of normalised temperature differences, the influences of the roof and atmosphere were balanced on dry Sunagoke moss in wind-induced convection, as the temperature ratios were close to 1. However, on moist Sunagoke moss, the evaporation consumed most of the heat, hence, the temperature ratio was lower than the other two model houses. The ratio further diminished near 0 in wind-induced convection. Nevertheless, the effects of wind velocity above 2 m/s were clarified identical, since no significant changes were found in the convection heat transfer coefficient, surface temperature, conduction heat flux, and interior temperature afterwards. (C) 2017 Elsevier B.V. All rights reserved.
机译：自几十年前以来，一直鼓励使用绿色屋顶来减轻城市热岛的发生并为城市地区提供生态系统服务。由于很少有关于在绿色屋顶实施中使用苔藓的文献，因此，本文介绍了Sunagoke（Racomitrium Canescens）苔藓绿色屋顶在解决城市热岛效应方面的热性能。此外，还讨论了Sunagoke苔藓上蒸发冷却的见解。实验是在人造气候室内进行的，环境温度和湿度分别设置为30 C和70％RH，以模拟日本典型的夏季环境。利用风速和辐照度对流传热的效果在干燥的Sunagoke模型房，潮湿的Sunagoke模型房和对照模型房中进行了测试。通过将风速从0更改为3 m / s，发现对流热量在没有蒸发的干燥屋顶表面（干燥的Sunagoke和控制模型房）中主导着整个传热。相比之下，在整个传热过程中，潮湿的Sunagoke绿屋顶的潜热通过无风对流控制和转移70％，通过风诱导对流控制和转移91％。弄湿了的Sunagoke绿屋顶的潜热和对流被认为是相互成反比的，当达到风对流状态时，分流增加。就归一化的温差而言，由于风速比接近1，因此屋顶和大气对干燥的Sunagoke苔藓的影响达到了平衡，但温度比接近1。但是，在潮湿的Sunagoke苔藓上，蒸发消耗了大部分热量，因此，温度比低于其他两个样板房。在风对流中，该比率进一步减小到接近0。然而，由于在对流传热系数，表面温度，传导热通量和内部温度之后没有发现显着变化，因此澄清了2 m / s以上风速的影响是相同的。 （C）2017 Elsevier B.V.保留所有权利。

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