Vertical Greenery Reduces Temperature


(by Cecilia Wong, Connie Fong and Henry Wong)

Vertical gardening reduces temperature by reflecting and absorbing heat up to 80 per cent of the heat, depending on the amount and type of greenery, a research shows.

A research paper study done by Dr. Sam C. M. Hui and Miss Zheng Zhao ( who area they? whixh university? NGOs?)shows vegetated plant covered surfaces can provide a cooler interior environment and regulate the thermal activity of an urban city.

Vertical gardens fully utilizes space for greening purposes,” said Dr. Hui.

The skyrise greenery, enhancing vertical density of “plantscaping” over buildings’ façade by covering present unused space with plants, is, theoretically,   

In theory, vertical gardens are suitable for all blocks, buildings because they do not require ng no additional space to be constructed, provided that and every building has consists of walls, he explained.

“Everywhere is suitable for green walls’ instalment As long as the building structure can withstand the weight of planting systems, vetical gardens ae possible” said Crystal Li, manager director of HK Green Walls.

The government has no regulation on instalment of greening structures on buildings’ surfaces but has provided only greening systems design guidelines by Housing Authority as “green features” is “excluded from Gross Floor Area and/ or Site Coverage calculations under the Buildings Ordinance” in order to “promote the construction of green and innovative buildings”.


(No need to say click here…that is obvious. But the map needs a proper caption. VERTICAL GARDENS IN HONG KONG)

By clicking the above picture, you will be able to access to the interactive map and locate the major vertical greening sites in Hong Kong.)

“Green walls offer environmental benefits, say reducing heat island effect, complementary complimentary to rooftop gardens,” Dr Hui added.

Concrete and glass, two common building materials in Hong Kong, absorb the most amount of heat among the 22 construction materials analysed that increases both indoor and outdoor temperature, according to “Code of Practice for OTTV( Overall Thermal Transfer Value) in Buildings” published on Buildings Department’s website.( shorten the sentence!)

“Vegetated walls reduces surface temperature by three to eight degree Celsius,” Ms Li, said “according to Malaysia Green Building Confederation.”

“However, green walls’ plants easily wilt in Hong Kong ” she said, “due to unfavourable environmental conditions, for instance, high building density leads to the lack of air circulation.”

The right choice and placement of plants in accordance with the environment is the key to ensure vegetated walls are well functioned, she added.

Ferns and spider plants, like Schefflera heptaphylla, of low moisture need and high viability, are suitable for outdoor living walls in Hong Kong, in which of high pollution and high number of vehicles, she explained.

“People have to accept that maintaining vertical gardens do cost,” Ms Li said. Without proper maintenance, including space planning, irrigation and cleaning of drainage systems, plants wilt, she added.

Newsbeat is a newspaper for HKBU IJ BEAT REPORTING class

Posted in Environment

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