• Anukrati Tandon
• Ishwar Chandra Vidya Sagar
• Deepti Sagar

With the increase in population, urbanization, and growth in living standards of people, the energy demand also increases. 20% of the total energy consumed in the world is by buildings, and it can further increase up to 25% by 2050 (EIA, Future of Cooling, 2018). There have been massive carbon dioxide emissions due to the use of different energy sources. These CO2 emissions and fossil fuel consumption have led to global warming and evident climate changes. This energy and environmental challenge has become a global concern. To address the challenge of increasing energy demand, one can either produce energy from renewable energy resources or reduce or control the energy demand in the building. The more sustainable solution to address this problem is to reduce the demand by applying effective strategies to reduce energy demand in buildings. In India, the share of the cooling load on the total electric load from buildings was 10.5%. Therefore, this study focuses on reducing the heat gain in buildings through passive techniques, to reduce this load. The roof of a low to mid-rise building receives a far greater amount of solar radiation than walls. Unlike walls, the roof is exposed to solar radiation throughout the day and hence heat transfer from the roof is considerably notable for its impact on the user comfort. The effect is considerably high in small-scale buildings such as individual homes, apartments, and low-rise buildings contributing to about 70% of the total heat gain in hot climates. Therefore, careful design and treatment of the roofs can have a significant reduction in the solar heat gain in buildings, maintain thermal comfort and thus save energy. A comparative study of techniques has been done to find the thermal performance of different techniques applied to the roofs using design builder software.

energy demand, cooling load, passive techniques, heat-gain, building envelope, roofs

"Reducing Heat Gain through Roofs: A Comparative Study of Passive Strategies for Mid-Rise Commercial Buildings in Composite Climate", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.9, Issue 6, page no.a166-a179, June-2022, Available :http://www.jetir.org/papers/JETIR2206021.pdf

"Reducing Heat Gain through Roofs: A Comparative Study of Passive Strategies for Mid-Rise Commercial Buildings in Composite Climate", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.9, Issue 6, page no. ppa166-a179, June-2022, Available at : http://www.jetir.org/papers/JETIR2206021.pdf