Journal ID : AMA-08-12-2022-11872
[This article belongs to Volume - 53, Issue - 12]
Total View : 479

Title : A Field Experimental Thermal Evaluation of Green Facade using Different Native Plant Species for Hot &Humid Climate of Chennai

Abstract :

The destruction of horizontal greenery has resulted in the development of an innovative technique called verticalgreening. It is a technique to bring back the lost greenery on the facades of the building for its numerous benefits in building and urban scale levels. However, due to lack of awareness and technical knowledge, its adoption is restricted, with the majority of its application for aesthetic purpose. Though there are numerous researches conducted to evaluate the thermal performance of vertical greening across the globe, there are only few researches performed to examine the thermal performance of vertical greening in hot and humid climate of Chennai using native edible and herbal plants. Vertical greening is of two types, Greenfaçade and Living wall. In Green facade, vines grow using simple support system to cover the entire wall from the growing medium placed at the base level. In living wall, a complex structural system holds the growing medium and the plants parallel to the wall. The temperature reduction of the green facade is directly dependent on the leaves size, thickness and density while in the case of livingwall, temperature reduction is influenced by multiple factors such as the soil medium, supporting structure, and varieties of plantsused. Even though researchers have proved that living wall reduces more temperature than Green facade, this research aims to establish that temperature reduction of the green facade depends on the type of plant species and its foliage density. This research aims to explore the thermal performance of Green facade using two different plant species with different physical parameters. An experimental methodology was used to measure the surface temperature behind the Green facade along with which the indoor temperature and humidity was measured. The experiment was conducted on the terrace of a residence located in Tambaram, Chennai for three days from 22 -24th September 2022. Three small-scale test boxes were used. Two test boxes were treated with two different plants while one box was kept as a bare model (Benchmark) for the comparison. The study plants are Clitoria ternatea (butterfly pea) and Basella rubra (Indian spinach), both of which are native to India and most commonly seen in Chennai. These plants are chosen for their longer lifespan, low maintenance, fast growth, and heattolerance. The analysis and the findings of the research showed that the surface temperature behind the Basella rubra and Clitoria ternatea was reduced by 7deg c and 4 deg c. The maximum indoor temperature reduction for Basella rubra and Clitoria ternatea was 3.6 deg c and 2.4deg c proving that the thermal performance of Green facade in reducing the surface and indoor temperature differs depending on the plant species used. Denser the foliage with succulent leaves of Basella rubra showed more temperature reduction than Clitoria ternatea which had smaller leaves with thin foliage coverage.

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