The radiation heat gain from walls is the main influencing factor in studying the heat transfer performance of enclosure structures,and it is particularly important to study the radiation heat gain from representative urban building walls based on the reflection characteristics of the underlying surface. The article selects three cities,Harbin,Beijing,and Lanzhou,and uses the sum of direct solar radiation and scattered sky radiation as the control group to explore the impact of the reflection characteristics of the underlying surface on the comprehensive outdoor air temperature,radiation energy in different cities,the proportion of reflected radiation energy to total radiation energy,and the impact on the total radiation energy of building walls. The results showed that compared with the control group,the reflection of the underlying surface had varying degrees of impact on the comprehensive outdoor air temperature and the radiation heat gain from the exterior wall. The hours when the comprehensive outdoor air temperature of the three cities increased by 2.5 ℃ or more were all 4 hours,with a value increase range of 0.51 ℃ to 5.23 ℃;The reflection of the underlying surface will intensify the radiation and heat gain of the building wall. Whether it is grassland or brick ground,the proportion of the reflected radiation of different underlying surfaces to the total radiation energy is in descending order:Lanzhou>Beijing>Harbin;In summer,the reflected radiation of brick ground is 77.6 MJ/m2,84.2 MJ/m2,and 87.6 MJ/m2 more than that of grassland,respectively;In winter,it is 23.0 MJ/m2,30.8 MJ/m2,and 32.4 MJ/m2 . This study provides a theoretical basis for further improving the thermal environment around buildings and rationalizing the layout of outdoor underlying surfaces.
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