Zhenyu Gai , Haiwei Yin , Fanhua Kong , Jie Su , Zhou Shen , Hui Sun , Shaoqi Yang , Hongqing Liu , Ariane Middel
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The ENVI-met model was used to simulate two scenarios with and without trees, and physiological equivalent temperature (PET) was calculated to quantify OTC. The results show that tree removal increased air temperature, wind speed, direct shortwave radiation, and decreased relative humidity, leading to an increase in PET by about 5.9 to 9.4 °C. Our shade analysis reveals that building shade can reduce PET by around 5.1 to 9.8 °C. Overall, urban shade infrastructure (mainly including trees and buildings) can reduce PET by around 9.4 to 17.1 °C synergistically. The nonlinear relationship of tree structural characteristics related to PET is further discussed to determine planning priorities and propose heat mitigation strategies to optimize physical spaces. We recommend combining dynamic shade from various urban infrastructure to improve OTC in the summer, improving urban outdoor livability.</div></div>","PeriodicalId":9273,"journal":{"name":"Building and Environment","volume":"267 ","pages":"Article 112320"},"PeriodicalIF":7.1000,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"How does shade infrastructure affect outdoor thermal comfort during hot, humid summers? Evidence from Nanjing, China\",\"authors\":\"Zhenyu Gai , Haiwei Yin , Fanhua Kong , Jie Su , Zhou Shen , Hui Sun , Shaoqi Yang , Hongqing Liu , Ariane Middel\",\"doi\":\"10.1016/j.buildenv.2024.112320\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>With global climate change and urbanization, the urban heat island effect and extreme heat have negatively affected the outdoor thermal comfort (OTC) of urban residents. 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Overall, urban shade infrastructure (mainly including trees and buildings) can reduce PET by around 9.4 to 17.1 °C synergistically. The nonlinear relationship of tree structural characteristics related to PET is further discussed to determine planning priorities and propose heat mitigation strategies to optimize physical spaces. We recommend combining dynamic shade from various urban infrastructure to improve OTC in the summer, improving urban outdoor livability.</div></div>\",\"PeriodicalId\":9273,\"journal\":{\"name\":\"Building and Environment\",\"volume\":\"267 \",\"pages\":\"Article 112320\"},\"PeriodicalIF\":7.1000,\"publicationDate\":\"2024-11-16\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Building and Environment\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0360132324011624\",\"RegionNum\":1,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CONSTRUCTION & BUILDING TECHNOLOGY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Building and Environment","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0360132324011624","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CONSTRUCTION & BUILDING TECHNOLOGY","Score":null,"Total":0}
引用次数: 0
摘要
随着全球气候变化和城市化的发展,城市热岛效应和极端高温对城市居民的室外热舒适度(OTC)产生了负面影响。因此,研究建筑环境如何影响室外热舒适度,对于改善城市设计和促进户外活动至关重要。在炎热、阳光充足的条件下,树木会增加室外热舒适度,而建筑物的动态遮阳也会对室外热舒适度产生积极影响。然而,关于树木和建筑遮阳对 OTC 的协同冷却效应的研究还很有限。本研究以中国南京市为研究区域,探讨了各种城市遮阳基础设施对 OTC 的差异和协同效应。利用 ENVI-met 模型模拟了有树和无树的两种情景,并计算了生理当量温度(PET)以量化 OTC。结果表明,移除树木会增加气温、风速、直接短波辐射,并降低相对湿度,导致 PET 上升约 5.9 至 9.4 °C。我们的遮阳分析表明,建筑遮阳可使 PET 降低约 5.1 至 9.8 °C。总体而言,城市遮阳基础设施(主要包括树木和建筑物)可协同降低 PET 约 9.4 至 17.1 °C。我们进一步讨论了树木结构特征与 PET 的非线性关系,以确定规划重点,并提出优化物理空间的防暑降温策略。我们建议将各种城市基础设施的动态遮阳结合起来,以改善夏季的室外温度,提高城市室外宜居性。
How does shade infrastructure affect outdoor thermal comfort during hot, humid summers? Evidence from Nanjing, China
With global climate change and urbanization, the urban heat island effect and extreme heat have negatively affected the outdoor thermal comfort (OTC) of urban residents. Therefore, it is critical to investigate how the built environment affects OTC to improve urban design and promote outdoor activities. Trees increase OTC under hot, sunny conditions, and dynamic shade cast from buildings has also been found to affect OTC positively. However, limited research has been conducted to understand the synergistic cooling effects of trees and building shade on OTC. Taking Nanjing City, China, as the study area, this study investigates the differences and synergistic effects of various urban shade infrastructure on OTC. The ENVI-met model was used to simulate two scenarios with and without trees, and physiological equivalent temperature (PET) was calculated to quantify OTC. The results show that tree removal increased air temperature, wind speed, direct shortwave radiation, and decreased relative humidity, leading to an increase in PET by about 5.9 to 9.4 °C. Our shade analysis reveals that building shade can reduce PET by around 5.1 to 9.8 °C. Overall, urban shade infrastructure (mainly including trees and buildings) can reduce PET by around 9.4 to 17.1 °C synergistically. The nonlinear relationship of tree structural characteristics related to PET is further discussed to determine planning priorities and propose heat mitigation strategies to optimize physical spaces. We recommend combining dynamic shade from various urban infrastructure to improve OTC in the summer, improving urban outdoor livability.
期刊介绍:
Building and Environment, an international journal, is dedicated to publishing original research papers, comprehensive review articles, editorials, and short communications in the fields of building science, urban physics, and human interaction with the indoor and outdoor built environment. The journal emphasizes innovative technologies and knowledge verified through measurement and analysis. It covers environmental performance across various spatial scales, from cities and communities to buildings and systems, fostering collaborative, multi-disciplinary research with broader significance.