Abstract
Various studies have confirmed that high thermal resistance in roof & wall can reduce the heat transfer load of the buildings. In this study, experimental investigation of the effects of some sustainable features (such as green roof, reflective coated roof & Fly ash brick (FAB) etc.) on the building has been conducted in the Indian context. For the purpose, two scaled building models i.e. Model I (conventional design) & Model II (green design) have been examined with different design configurations. The sensible heat transfer (SHT) load of the building is reduced by 21% - 29% through the use of FAB with cavity wall in place of Fired clay brick (FCB) wall. The load reduction increases to 26% - 44% by using FAB cavity wall with reflective coating on the roof. This reduction further increases to 64% - 68% with FAB cavity wall along with green roof. In this final scenario, the monthly electrical energy saving for air-conditioning is approximately 5.1 kWhe/m2 per unit envelope area, with associated reduction in GHG emissions up to 6.36 kg CO2eq/m2 per unit envelope area, assuming continuous operation of HVAC systems.
Highlights
At the United Nations Climate Change Conference in 2015 at Paris, 195 members agreed to mitigate the impact of CO2 emissions on global warming, with the goal to limit global temperature rise below 2 ̊C [1]
The sensible heat transfer (SHT) load of the building is reduced by 21% - 29% through the use of Fay ash brick (FAB) with cavity wall in place of Fired clay brick (FCB) wall
The load reduction increases to 26% - 44% by using FAB cavity wall with reflective coating on the roof
Summary
At the United Nations Climate Change Conference in 2015 at Paris, 195 members agreed to mitigate the impact of CO2 emissions on global warming, with the goal to limit global temperature rise below 2 ̊C [1]. In India, the life cycle energy of the buildings is in the range of 240 380 kWhe/m2-year depending on the climatic condition and building envelope [6]. The concept of sustainable building design has emerged that mainly aims to use green building design, eco-friendly materials and reduce the resource usage as well as life cycle energy. Various active and passive techniques are used in a building to improve thermal comfort as well as reduce operational energy such as alternative building materials, insulation in built-envelope, live wall & green roof etc. Building colour and reflective coatings play significant role in cooling of the building and various studies suggest that use of light reflective colour provides better thermal comfort and reduced indoor temperature of the built envelope [13] [14] [15]. Two scaled building models were constructed for this purpose: Model I—conventional building design (consists of FCB wall & RCC roof), Model II—Improved building design (consists of FAB with cavity wall & RCC roof with reflective coating/green roof)
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