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Cold-season solar input and ambivalent thermal behavior brought by climber greenwalls

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  • Jim, C.Y.

Abstract

Most greenwall studies focus on cooling and energy conservation in the warm season, and tropical cold-season has received little attention. This field-experimental study in humid-subtropical Hong Kong evaluated winter thermal behavior of climber greenwalls. Orientation and weather factors regulated solar-irradiation regimes with critical impact on vegetation thermal responses. Temperature differentiation occurred mainly on sunny day, with subdued variations on cloudy and rainy days. The south greenwall on sunny day received the highest solar-energy input, bringing divergent surface temperature in three climber species. The daytime descending cooling sequence was: Control-air > Pyrostegia venusta > Bauhinia corymbosa > Ficus pumila > Control-surface. Heat-sink effect related to foliage-thickness and moisture-content influenced climber thermal responses. Exceeding a solar- irradiance threshold of 500 Wm−2 was a prerequisite for notable solar-warming and transpiration-cooling, bringing well-differentiated climber-surface temperature. Cooling of vegetation-surface and Anterior-ambient-air was contrasted by warming behind the greenwall. Posterior-airgap with trapped stagnant air and Posterior-concrete-surface were warmed consistently above control concrete-surface on sunny and cloudy days. This winter passive warming mechanism denotes a new dimension in thermal benefits operating behind the greenwall. The thermal-gradient can transmit heat into indoor space, with benefits on human comfort, health and energy conservation.

Suggested Citation

  • Jim, C.Y., 2015. "Cold-season solar input and ambivalent thermal behavior brought by climber greenwalls," Energy, Elsevier, vol. 90(P1), pages 926-938.
    • Handle: RePEc:eee:energy:v:90:y:2015:i:p1:p:926-938
    DOI: 10.1016/j.energy.2015.07.127
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    Cited by:

    1. Šuklje, Tomaž & Medved, Sašo & Arkar, Ciril, 2016. "On detailed thermal response modeling of vertical greenery systems as cooling measure for buildings and cities in summer conditions," Energy, Elsevier, vol. 115(P1), pages 1055-1068.
    2. Susca, T. & Zanghirella, F. & Colasuonno, L. & Del Fatto, V., 2022. "Effect of green wall installation on urban heat island and building energy use: A climate-informed systematic literature review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 159(C).
    3. Hankun Lin & Yiqiang Xiao & Florian Musso & Yao Lu, 2019. "Green Façade Effects on Thermal Environment in Transitional Space: Field Measurement Studies and Computational Fluid Dynamics Simulations," Sustainability, MDPI, vol. 11(20), pages 1-21, October.
    4. Patryk Antoszewski & Dariusz Świerk & Michał Krzyżaniak, 2020. "Statistical Review of Quality Parameters of Blue-Green Infrastructure Elements Important in Mitigating the Effect of the Urban Heat Island in the Temperate Climate (C) Zone," IJERPH, MDPI, vol. 17(19), pages 1-36, September.
    5. Oquendo-Di Cosola, V. & Olivieri, F. & Ruiz-García, L., 2022. "A systematic review of the impact of green walls on urban comfort: temperature reduction and noise attenuation," Renewable and Sustainable Energy Reviews, Elsevier, vol. 162(C).

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