Impact of Indoor Heat Load and Natural Ventilation on Thermal Comfort of Radiant Cooling System: An Experimental Study
Impact of Indoor Heat Load and Natural Ventilation on Thermal Comfort of Radiant Cooling System: An Experimental Study
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DOI：
10.1016/j.enbenv.2022.04.003
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发表时间：
2022-04
影响因子：
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通讯作者：
K. Dharmasastha;D. Samuel;S. Nagendra;M. Maiya
中科院分区：
文献类型：
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作者：
K. Dharmasastha;D. Samuel;S. Nagendra;M. Maiya
建筑物的建造和运营约占全球能源消耗的20%。传统建筑由于使用高耗能建筑材料和传统的施工方法，其隐含能量很高。较高的运行能源是由于使用耗电的传统空调系统。因此，转向节能冷却技术和环保建筑材料可以显著节省能源和减少二氧化碳排放。在本研究中，一个节能的热激活建筑系统（TABS）与玻璃纤维增强石膏（GFRG），一种生态友好的建筑材料相结合。建议的混合系统被称为热活化玻璃纤维增强石膏（TAGFRG）系统。该系统不仅节能环保，而且提供更好的热舒适性。在印度马德拉斯理工学院（IITM）的场地上建造了一个带有TAGFRG屋顶的实验室，该学院位于热带干湿气候区。研究了室内显热负荷和自然通风对TAGFRG系统热舒适性的影响。内部热负荷从400 W增加到700 W会降低室内空间的热舒适性。这从操作温度从29.8 ° C增加到31.5 °C以及预测的不满意百分比从44.5%增加到80.9%可以看出。自然通风使室内空气温度的日波动分别增加了1.6 °C和1.9 °C。它将室内最大二氧化碳浓度从912 ppm降低到393 ppm。
Construction and operation of buildings are responsible for about 20% of the global energy consumption. The embodied energy of conventional buildings is high due to the utilization of energy-intensive construction materials and traditional construction methodology. Higher operational energy is attributed to the usage of power-consuming conventional air-conditioning systems. Therefore, moving to an energy-efficient cooling technology and eco-friendly building material can lead to significant energy savings and CO2emission reduction. In the present study, an energy-efficient thermally activated building system (TABS) is integrated with glass fiber reinforced gypsum (GFRG), an eco-friendly building material. The proposed hybrid system is termed the thermally activated glass fiber reinforced gypsum (TAGFRG) system. This system is not only energy-efficient and eco-friendly but also provides better thermal comfort. An experimental room with a TAGFRG roof is constructed on the premises of the Indian Institute of Technology Madras (IITM), Chennai, located in a tropical wet and dry climate zone. The influence of indoor sensible heat load and the impact of natural ventilation on the thermal comfort of the TAGFRG system are investigated. An increase in internal heat load from 400 to 700 W deteriorates the thermal comfort of the indoor space. This is evident from the increases in operative temperatures from 29.8 to 31.5 °C and the predicted percentage of dissatisfaction from 44.5% to 80.9%. Natural ventilation increases the diurnal fluctuation of indoor air temperature by 1.6 and 1.9 °C for with and without cooling cases, respectively. It reduces the maximum indoor CO2concentration from 912 to 393 ppm.