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urban scale rooftop super cool broadband radiative coolers in humid conditions

Building Simulation 2024年第9期17卷 1629-1651页

作者： Rupali Khatun Debashish Das Samiran Khorat Sk Mohammad Aziz Prashant Anand Manju Mohan Ansar Khan Dev Niyogi Mattheos Santamouris School of Environmental Studies Jadavpur UniversityKolkataIndia Department of Architecture Jadavpur UniversityKolkataIndia Department of Chemistry Narajole Raj CollegeVidyasagar UniversityMidnaporeIndia Department of Architecture and Regional Planning Indian Institute of TechnologyKharagpurIndia Centre for Atmospheric Sciences Indian Institute of TechnologyDelhiIndia Department of Geography Lalbaba CollegeUniversity of CalcuttaKolkataIndia Department of Earth and Planetary Sciences Jackson School of GeosciencesUniversity of Texas at AustinAustinUSA Fariborz Maseeh Department of Civil Architecturaland Environmental EngineeringCockrell School of EngineeringUniversity of Texas at AustinAustinUSA School of Built Environment University of New South WalesSydneyAustralia

The presence of water molecules in the air can impact how super cool broadband radiative coolers *** humidity in the lower atmosphere traps infrared radiation,reducing heat sent back to outer *** this study,a mesoscale urban climate model is used to evaluate the newly developed super cool materials with broadband emissivity not selective in atmospheric window as an arsenal for urban heat management of tropical wet and dry cities like *** results suggest that the energy balance over urban domain has substantially been altered by the city scale deployment of super cool broadband radiative cooling materials on the building *** ratio and evaporative fraction values were found decreasing and increasing,respectively with a positive directional polynomial(R2=0.968)relationship,after the implementation of super cool broadband radiative cooling materials and in comparison,to the unmitigated *** high solar hour(14:00 LT),additional thermal variables of urban domain such as 2 m air temperature,surface skin temperature,urban canopy temperature,and roof surface temperature decrease by 2.3℃,5.4℃,0.8℃,and 31.7℃,*** super cool broadband materials achieve sub-ambient temperatures up to 11.7℃during peak hours,reduce surface wind speed by 2.5 m s−1,and lower the planetary boundary layer by 1475 *** average daytime drop is approximately 7.3℃,and at night,it is close to 2.4℃.Deployment induces a“regional high”over urban areas,disrupting sea breeze onset and lowering the planetary boundary ***,an optimal cooling performance for super cool broadband radiative coolers can be achieved in lower humidity conditions,as their efficiency decreases with increased *** needing further investigation,these findings of nano-science-based super cool broadband materials offer valuable insights for policymakers and urban planners addressing thermal management in densely packed tropical urban environments.

关键词： tropical urban climate extreme urban heat urban heat mitigation radiative cooler wrf-urban model

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