Long-wave infrared radiation properties of vertical green façades in subtropical regions

Zhao, Cheng; Zhang, Lei; Yang, Yuanqin; Liu, Mingxin; Yan, Junru; Zhao, Lihua

doi:10.1016/j.buildenv.2022.109518

Cited by 11 publications

(3 citation statements)

References 52 publications

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“…Many research works have proposed mathematical models useful to describe the heat fluxes in GFs, thus assessing their thermal performance [40][41][42][43]. The different heat transfer mechanisms have been investigated: solar radiative exchange [44], long-wave radiative transfer [45,46], and convective heat flux [47]. The latent heat transfer due to the plant's evapotranspiration has also been studied and quantified [41,48,49].…”

Section: Thermal Behavior and Energy Modelingmentioning

confidence: 99%

Thermal Performance of Green Façades: Research Trends Analysis Using a Science Mapping Approach

Blanco

Convertino

2023

Sustainability

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Buildings consume a significant part of the world’s resources and energy. The growing environmental awareness and urgent need to reduce energy consumption have highlighted the importance of introducing innovative solutions as nature-based systems in new buildings’ construction and retrofitting. In this regard, green façades that integrate vegetation into building envelopes are attractive. This paper presents a bibliographic analysis, based on science mapping, of the available literature on green façades from 1999–2022 with a focus on the thermal effect on the building and on the surroundings. The objective of this study is to reveal the structure and the evolution of the research activity in the field, outlining the main research topics and the future research directions. The analysis was performed on a dataset of 270 documents. The results indicate a growing interest in this topic over the last six years and the multidisciplinary dimension of the studies. The keyword cluster analysis indicates the emergence of three main search topics: thermal behavior and energy modeling; urban design and large-scale effects; sustainable buildings management. A greater future dissemination of green façades could be enabled by further research results based on the application of a multidisciplinary approach and of standardized methods.

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Section: Thermal Behavior and Energy Modelingmentioning

confidence: 99%

Thermal Performance of Green Façades: Research Trends Analysis Using a Science Mapping Approach

Blanco

Convertino

2023

Sustainability

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“…On the other hand, the vegetation, acting as a thermal and wind barrier, provides air and wall surface warming in cold periods (Perini et al, 2011;Xing et al, 2019;Zhao et al, 2022).…”

Section: Bwmentioning

confidence: 99%

A nature-based system for improving Mediterranean buildings’ performance: contribution to energy saving by heat transfer reduction and influence of climatic parameters

et al. 2023

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Urban environments can be turned greener and more sustainable by letting in vegetation. The application of green façades on buildings’ vertical surfaces is a viable option that brings various advantages. This study focuses on the energy benefit provided by an evergreen green façade in Mediterranean climate conditions. The results came from a long experimental campaign, heat fluxes evaluation and statistical analyses. The thermal behaviour of the experimental green façade was analysed all year round, highlighting differences between warm and cold periods and between time of the day. The main advantage was assessed in terms of energy saving, defined as heat flux reduction through the wall covered with vegetation in comparison with an unvegetated wall. The study pointed out that energy saving was achieved throughout the year, but in different time of the day based on the season. A daytime energy saving was obtained in warm periods due to the shading effect and the plants evapotranspiration. A night-time benefit was reached in cold periods mainly thanks to the thermal and wind barrier action of the green layer. The results showed daily mean values of energy saving equal to 11.47 W m-2 for a warm period and to 3.23 W m-2 for a cold period. The statistical analysis highlighted that the energy saving was positively influenced by external air temperature especially at daytime. Overall, higher energy saving was provided by the green façade when higher external air temperature values were recorded. This research contributes to fill existing literature gaps on the yearly behaviour of green façades and on the energy benefits these provide.

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“…It was found that radiative cooling could save up to 11% of power consumption for cooling purposes. Zhao et al [ 29 ] carried out theoretical analyses and field measurements to examine the long-wave infrared radiation properties of vertical green facades in the subtropical city of Guangzhou China. Based on the observation data, an empirical equation for transmitting long-wave infrared radiation was established.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and Experimental Study on the Impact of Long-Wave Radiation on the Greenhouse Effect of a Prefabricated Temporary House

Long

2022

Entropy

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In this paper, an experimental rig of a prefabricated temporary house (PTH) was first established. Then, predicted models for the thermal environment of the PTH with and without considering long-wave radiation were developed. Next, the exterior-surface, interior-surface and indoor temperatures of the PTH were calculated by using the predicted models. The calculated results were then compared with the experimental results to study the influence of long-wave radiation on the predicted characteristic temperature of the PTH. Finally, the predicted models were used to calculate the cumulative annual hours and the intensity of the greenhouse effect of four different climate cities (Haerbin, Beijing, Chengdu, Guangzhou). The results showed that: (1) the predicted temperature values of the model considering long-wave radiation were closer to the experimental results; (2) the effect level of the long-wave radiation on the three characteristic temperatures of the PTH from big to small was: exterior-surface temperature, interior-surface temperature, and indoor temperature; (3) the long-wave radiation had the greatest impact on the predicted temperature value of the roof; (4) under different climate conditions, the cumulative annual hours and the intensity of the greenhouse effect considering long-wave radiation were smaller than those without considering long-wave radiation; (5) the duration of the greenhouse effect considering and ignoring long-wave radiation varied significantly with the climate region, and that in Guangzhou was the longest, followed by Beijing and Chengdu, and that in Haerbin was the shortest.

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Long-wave infrared radiation properties of vertical green façades in subtropical regions

Cited by 11 publications

References 52 publications

Thermal Performance of Green Façades: Research Trends Analysis Using a Science Mapping Approach

Thermal Performance of Green Façades: Research Trends Analysis Using a Science Mapping Approach

A nature-based system for improving Mediterranean buildings’ performance: contribution to energy saving by heat transfer reduction and influence of climatic parameters

Theoretical and Experimental Study on the Impact of Long-Wave Radiation on the Greenhouse Effect of a Prefabricated Temporary House

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