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Thermal Comfort and Longwave Radiation over Time in Urban Residential Complexes

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  • You Jin Kwon

    (Interdisciplinary Program in Landscape Architecture, Seoul National University, Seoul 08826, Korea)

  • Dong Kun Lee

    (Department of Landscape Architecture and Rural System Engineering, Seoul National University, Seoul 08826, Korea)

Abstract

Large cities with a high concentration of high-rise buildings are shaded by urban canyon. This brings a cooling effect compared to the space exposed to the sun, but is not always cool due to the longwave radiation emitted from buildings and the built environment. We tested the micro-scale effects of major external spatial factors, trees, and buildings, under shade on longwave radiation shifts to understand the effects of large shaded areas in megacities. Incoming and outgoing longwave radiations (ILR and OLR, respectively) were found to decrease the overall observation by time zone. Longwave radiation on a micro-scale was also inversely proportional to the tree volume. From mean radiant temperature (MRT) analysis, we found that about a 10% decrease in MRT could be achieved by increasing tree volume by around 50%. Larger tree volumes corresponded to greater blocking effects on longwave radiation. Considering the tree volume, a multilayer urban tree canopy composition can more favorably improve the thermal environment and energy sustainability of a city compared to a single-layer canopy. Larger trees planted with harmonious shrubs are the most effective in reducing longwave radiation.

Suggested Citation

  • You Jin Kwon & Dong Kun Lee, 2019. "Thermal Comfort and Longwave Radiation over Time in Urban Residential Complexes," Sustainability, MDPI, vol. 11(8), pages 1-19, April.
    • Handle: RePEc:gam:jsusta:v:11:y:2019:i:8:p:2251-:d:222804
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    References listed on IDEAS

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    1. Wang, Zhi-Hua & Zhao, Xiaoxi & Yang, Jiachuan & Song, Jiyun, 2016. "Cooling and energy saving potentials of shade trees and urban lawns in a desert city," Applied Energy, Elsevier, vol. 161(C), pages 437-444.
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    3. Rossi, Federico & Castellani, Beatrice & Presciutti, Andrea & Morini, Elena & Filipponi, Mirko & Nicolini, Andrea & Santamouris, Matheos, 2015. "Retroreflective façades for urban heat island mitigation: Experimental investigation and energy evaluations," Applied Energy, Elsevier, vol. 145(C), pages 8-20.
    4. Yupeng Wang & Hiroatsu Fukuda, 2019. "The Influence of Insulation Styles on the Building Energy Consumption and Indoor Thermal Comfort of Multi-Family Residences," Sustainability, MDPI, vol. 11(1), pages 1-14, January.
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    Cited by:

    1. Yun Gao & Ensiyeh Farrokhirad & Adrian Pitts, 2023. "The Impact of Orientation on Living Wall Façade Temperature: Manchester Case Study," Sustainability, MDPI, vol. 15(14), pages 1-24, July.
    2. Xuan Luo & Tianzhen Hong & Yu-Hang Tang, 2020. "Modeling Thermal Interactions between Buildings in an Urban Context," Energies, MDPI, vol. 13(9), pages 1-17, May.
    3. You Jin Kwon & Dong Kun Lee & Kiseung Lee, 2019. "Determining Favourable and Unfavourable Thermal Areas in Seoul Using In-Situ Measurements: A Preliminary Step towards Developing a Smart City," Energies, MDPI, vol. 12(12), pages 1-24, June.
    4. You Jin Kwon & Dong Kun Lee & You Ha Kwon, 2020. "Is Sensible Heat Flux Useful for the Assessment of Thermal Vulnerability in Seoul (Korea)?," IJERPH, MDPI, vol. 17(3), pages 1-26, February.

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