Estimating heat flux transmission of vertical greenery ecosystem

Jim, Chi Yung; He, Hongming

doi:10.1016/j.ecoleng.2011.02.005

Cited by 110 publications

(39 citation statements)

References 35 publications

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“…Appropriate technology and materials could be evaluated to suit local conditions (Jim and He 2011). Native species, preferably flowering climbers, could be tested by field experiments.…”

Section: Ameliorate Pervasive Urban Soil Constraintsmentioning

confidence: 99%

Sustainable urban greening strategies for compact cities in developing and developed economies

Jim

2012

Urban Ecosyst

210

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Urban greening contributes notably to quality of life and ecosystem services in cities. Compact cities in developing and developed countries are commonly beset by greenspace deficit. Based on literature review supplemented by field studies in different cities, a sustainable urban greening strategy is proposed. Urban renewal and new developments without a greening vision could miss the opportunities to bring relief. The public and private sectors can join hands to insert plantable spaces into the urban fabric. Urban greenspaces (UGS) with good connectivity forming a green network to permeate the city constitute the hallmarks of a naturalistic design. Preservation and creation of natural areas with rich biodiversity offer a new dimension to UGS design. Greening benefits could be expressed in economic terms to complement conventional ecological-environmental emphasis. Outstanding trees could receive high-order conservation efforts, and trees in construction sites warrant enhanced protection. Tree transplanting demands an overhaul in concepts and skills. Improving roadside tree planting and maintenance offers a cost-effective way to upgrade the townscape. Ameliorating widespread soil limitations could remove a major hindrance to tree growth. Innovative ideas of development right transfer, street pedestrianization, river and canal revitalization, green roofs and green walls could mobilize hitherto underused plantable resources. Lacking appropriate institutional setup and scientific capability pose intractable bottlenecks. Innovative public policies and greening technologies are needed for sustained improvements. Amalgamating natural and social sciences in a multidisciplinary approach and reinforcing the link between science and public policies could overhaul greening.

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“…Appropriate technology and materials could be evaluated to suit local conditions (Jim and He 2011). Native species, preferably flowering climbers, could be tested by field experiments.…”

Section: Ameliorate Pervasive Urban Soil Constraintsmentioning

confidence: 99%

Sustainable urban greening strategies for compact cities in developing and developed economies

Jim

2012

Urban Ecosyst

210

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“…Indirect or double-skin green façades include a supporting structure for vegetation. As low-cost, easily applicable vertical greening systems [33], DGFs offer additional greening potential for high density urban areas where space for shade trees is limited, but many high-rise building walls exist [5,14]. The potential to use DGFs may be even greater in areas of low-and medium-rise residential, industrial, and commercial buildings in large, sprawled cities [11].…”

Section: Introductionmentioning

confidence: 99%

Cooling effect of direct green façades during hot summer days: An observational study in Nanjing, China using TIR and 3DPC data

Yin

Kong

Middel

et al. 2017

Building and Environment

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Highlights• Direct green façades (DGFs) are being applied to buildings in high density cities.• A new methodology to evaluate DGFs' fine-scale cooling effect is presented.• DGF enables 4.67 and 8.03 °C maximum surface temperature reduction compared to bare wall at overall and pixel scales.• DGF cooling effect is most obvious around midday and significantly decreases at night.• Surface temperatures of DGF exhibit significant spatial variations at pixel scale. AbstractThermal regulation is a key ecosystem service provided by direct green façades (DGFs), as vegetated walls absorb short wave radiation, reduce solar re-radiation from hard surfaces, and provide cooling due to shading and evapotranspiration. Few studies have investigated the correlation between the cooling effect of DGFs and vegetation characteristics at a fine spatial and temporal scale. This paper presents a new methodology to evaluate the cooling effect of DGFs related to fine-scale plant characteristics for hot summer days using thermal infrared (TIR) and three-dimensional point cloud (3DPC) data, through a case study conducted at the Executive Office Building on Nanjing University's Xianlin Campus, China. Results show that daily mean DGF surface temperature is significantly lower than the average bare wall surface temperature, with a maximum reduction of 4.67 °C. The cooling effect of the DGF is most obvious during midday (10:30 h to 16:00 h) and significantly decreases at night. At the pixel scale, the DGF exhibits a significant spatial variation of surface temperatures, which may be closely related to the DGF's canopy structure. Among the four vegetation indices acquired based on 3DPC data, the percentage of green coverage and the cooling effect of the DGF exhibited a linear relationship, while plant thicknesses, point density, and volume of the green façade were power function distributions. Incoming solar radiation and air temperature are the dominant independent variables in cooling effect and surface temperature fitting models. Our findings can guide DGF design to cool the thermal environment more effectively and to enhance building energy savings.

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“…Two experiments were carried out to compare the air temperature and humidity in the internal corridor. The outdoor temperature and relative humidity were measured 30 cm from the facade using a HOBO U12-011 (Onset Computer Corporation, Massachusetts, USA) [9,17] humidity and temperature data logger (AE2.5 % accuracy for RH and AE0.35 C accuracy for temperature). Measurements of temperature and relative humidity are made on the surface of the vertical greenery system which is facing towards the north.…”

Section: Methodsmentioning

confidence: 99%

An Experimental Study on Bioclimatic Design of Vertical Greenery Systems in the Tropical Climate

Jaafar

Said

Reba

et al. 2014

The Malaysia-Japan Model on Technology Partnership

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Estimating heat flux transmission of vertical greenery ecosystem

Cited by 110 publications

References 35 publications

Sustainable urban greening strategies for compact cities in developing and developed economies

Sustainable urban greening strategies for compact cities in developing and developed economies

Cooling effect of direct green façades during hot summer days: An observational study in Nanjing, China using TIR and 3DPC data

An Experimental Study on Bioclimatic Design of Vertical Greenery Systems in the Tropical Climate

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