Impact of solar reflectivity and infrared emissivity on the thermal performance of metal and concrete roofs in cloudy warmhumid climate  

作　　者：Jefferson Torres-Quezada Antonio Isalgué Helena Coch 

机构地区：[1]CONSISO Lab,Universidad Católica de Cuenca,Cuenca 010102,Ecuador [2]Architecture,Energy and Environment,Polytechnic University of Catalonia,Barcelona 08028,Spain

出　　处：《Frontiers of Architectural Research》2024年第4期842-857,共16页建筑学研究前沿（英文版）

基　　金：supported by Catholic University of Cuenca,project code PICODS21-35;HC+AI acknowledges the Spanish Ministry of Economy,project code:BIA2016-77675-R and PID2020-116036RB-I00.

摘　　要：Regions near latitude 0are characterized by warm-humid climate and also by high cloudiness.In these regions,metal roofs has been the most widely used typology.However,in the last decades,the use of heavy concrete roofs has increased significantly.Given its material characteristics,this roof typology offers a higher thermal resistance and thermal mass than a metal roof.Most strategies focus on the use of these characteristics,as well as the use of high reflectivity and emissivity.However,the impact of cloudiness on the effectiveness of these strategies has been little addressed.This research focuses on the impact of reflectivity and emissivity change on the thermal performance of these two roofs in a cloudy warm-humid climate.To achieve this objective,simulations validated with measurements were used.The results show that the efficiency of reflectivity and emissivity is lower in this region compared to other regions.The impact of these properties is further reduced with increasing thermal mass or decreasing thermal transmittance,so the effectiveness of reflectivity and emissivity is minimal on the concrete roof.Finally,this study supports that a metal roof with a reflectivity and emissivity above 0.70 can offer lower daily average temperatures than a concrete roof.

关 键 词：Concrete roof Metal roof Radiative properties Simulations MEASUREMENTS 

分 类 号：TU111[建筑科学—建筑理论] TU119