Cool roofs: High tech low cost solution for energy efficiency and thermal comfort in low rise low income houses in high solar radiation countries
Cool roofs: High tech low cost solution for energy efficiency and thermal comfort in low rise low income houses in high solar radiation countries
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DOI：
10.1016/j.enbuild.2018.07.005
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发表时间：
2018-10-01
影响因子：
6.7
通讯作者：
Novieto, Divine
中科院分区：
文献类型：
--
作者：
Kolokotroni, Maria;Shittu, Emmanuel;Novieto, Divine
在太阳辐射和外部空气温度高的地方，冷屋顶在减少冷负荷和缓解过热方面最为有效。本文介绍了一个低收入的房子在牙买加的实验研究和计算研究在赤道周围的三个国家：牙买加，巴西东北部（累西腓）和加纳的结果。在牙买加的一个典型的单层房屋的案例研究中，在屋顶上安装凉爽的油漆之前和之后进行了监测;在平均太阳辐射强度接近420 W/m2和环境空气温度接近28摄氏度的日子里，内部天花板表面温度平均降低6.8摄氏度，内部空气温度降低2.3摄氏度。监测结果被用来成功地校准一个EnergyPlus模型;为加纳和巴西开发了类似的模型，这两个国家在规模和/或结构上有所不同，以反映各国的具体做法。年度模拟表明，内部天花板表面温度平均降低3.2-5.5摄氏度，内部空气温度降低0.75-1.2摄氏度。冷却需求模拟（设定点24摄氏度）表明，三个地点的年潜在节能量相似（类似于190千瓦时/平方米/年），尽管估计的二氧化碳减排量因发电燃料而异。冷却屋顶的老化会使负荷节省减少22-26 kWh/m（2）/年。(C)2018作者由爱思唯尔公司出版
Cool roofs are most effective in reducing cooling loads and alleviating overheating in locations with high solar radiation and external air temperature. This paper presents results of an experimental study of a low income house in Jamaica and a computational study in three countries around the equator: Jamaica, Northeast Brazil (Recife) and Ghana. A case-study typical of single storey houses in Jamaica was monitored before and after the installation of a cool paint on the roof; on days with average solar radiation intensity of similar to 420W/m(2) and ambient air temperature of similar to 28 degrees C, internal ceiling surface temperature is reduced by an average of 6.8 degrees C and internal air temperature by 2.3 degrees C. Monitoring results were used to calibrate successfully an EnergyPlus model; similar models were developed for Ghana and Brazil differing in size and/or construction to reflect country specific practices. Annual simulations indicate that internal ceiling surface temperatures are reduced on average by 3.2-5.5 degrees C and internal air temperatures by 0.75-1.2 degrees C. Cooling demand simulations (setpoint 24 degrees C) indicate similar annual potential savings in the three locations (similar to 190 kWh/m(2)/year) although estimated CO2 emissions reduction differ reflecting electricity generation fuels. Aging of the cool roof has an impact reducing load savings by 22-26 kWh/m(2)/year. (C) 2018 The Authors. Published by Elsevier B.V.