Impact of indoor heat load and natural ventilation on thermal comfort of radiant cooling system:An experimental study  

作　　者：K Dharmasastha D.G.Leo Samuel S.M.Shiva Nagendr M.P.Maiya 

机构地区：[1]Department of Mechanical Engineering,Indian Institute of Technology Madras,Chennai,Tamil Nadu 600036,India [2]Barghest Building Performance Pte.Ltd.,118535,Singapore [3]Department of Civil Engineering,Indian Institute of Technology Madras,Refrigeration and Air Conditioning,Chennai 600036,India [4]Department of Building Enivironment and Energy Engineering,The Hong Kong Polytechnic University,Hong Kong

出　　处：《Energy and Built Environment》2023年第5期543-556,共14页能源与人工环境（英文）

基　　金：The authors thank the Department of Science and Technology(DST),Government of India,New Delhi for funding this study(Reference No.:SR/S3/MERC/00091/2012).

摘　　要：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 mate-rials 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 CO 2 emission reduction.In the present study,an energy-efficient thermally activated building system(TABS)is integrated with glass fiber rein-forced 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℃ 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℃ for with and without cooling cases,respectively.It reduces the maximum indoor CO 2 concentration from 912 to 393 ppm.

关 键 词：Thermally activated building system AIR-CONDITIONING Natural ventilation Thermal comfort Indoor air quality 

分 类 号：TU20[建筑科学—建筑设计及理论]