Faculty Publications
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Item A Multi-dimensional Study on Impact of Energy Efficiency on Life Cycle Cost of a Single-Family Residential Building(Springer Science and Business Media Deutschland GmbH, 2021) Shifad, S.; Pati, P.; Das, B.B.A sustainable building is the one which causes least impact on the environment by appropriate selection of construction materials, appliances and other practices. Many rating systems have been put forward in the recent years to provide guidelines for constructing and accessing the performance of green buildings. Indian Green Building Council (IGBC) rating system is one such guideline available in India. eQUEST has been proved to be powerful tool for analysing the projected energy efficiency of buildings in the initial design phase. This particular study aims to identify effectiveness of higher green certification towards energy savings. Building simulation was done for a double-storey residential building situated in western coast city of Mangalore, India for each certification level namely, certified, silver, gold and platinum. The results obtained from the simulation were analysed to quantify the energy-saving potential and energy efficiency of higher green certification of IGBC green homes. Life cycle costs of single-family green residential buildings of similar type and function rated by IGBC rating systems for buildings was evaluated and compared in terms of savings to investment ratio, net saving and payback period. © 2021, Springer Nature Singapore Pte Ltd.Item Next-generation building envelopes: Smart materials, energy efficiency and environmental impact(Elsevier B.V., 2025) Barbhuiya, S.; Das, B.B.; Adak, D.; Rajput, A.Building envelopes play a crucial role in enhancing the energy efficiency, sustainability, and overall performance of modern buildings. This paper provides a comprehensive review of cutting-edge materials and technologies for smart and sustainable building envelopes. It highlights the transition from traditional to advanced materials, focusing on the integration of smart materials such as thermochromic and electrochromic systems, shape memory alloys, and self-healing materials. These innovations enable dynamic responses to environmental changes, enhancing comfort and energy efficiency. Additionally, the review explores sustainable materials, including natural, biodegradable insulation, recycled components, and low-carbon alternatives that contribute to the circular economy. Advanced insulation technologies such as vacuum insulation panels, phase change materials, and aerogels are discussed, emphasizing their superior thermal performance. The study also examines innovative facade solutions, such as adaptive facades, photovoltaic-integrated systems, and hybrid designs that merge sustainability with energy generation. Key challenges in adopting these materials—such as cost, regulatory compliance, and market readiness—are discussed, along with the environmental benefits, including energy savings and reduced carbon footprints. The paper concludes by identifying opportunities for future research and development in smart and sustainable building envelopes, highlighting their potential in advancing energy-efficient, climate-responsive architecture. © 2025 The AuthorsItem Comparative Study of Energy Efficiency Criteria for IGBC and GRIHA Systems Using Simulation(Springer, 2023) Rakesh, P.; Harisankar, R.; Das, B.B.Energy efficiency criteria are important in Green Building Rating (GBR) systems, and the requirements vary depending on the GBR system. A comparison study is conducted to distinguish between two major GBR systems used in India: Indian Green Building Council Green Homes (IGBC GH) and Green Rating for Integrated Habitat Assessment (GRIHA). The energy simulation software eQuest was used to forecast annual energy demand for a case study multi-family residential building with various design scenarios. Various design combinations for the roof envelope, wall envelope, and HVAC efficiency were chosen, and the possibilities of meeting the energy efficiency criteria of the two GBR systems were discussed. It was discovered that an improvement made based on envelope condition, the efficiency of the HVAC system considered in this study, and assigning renewable energy gives higher energy performance under IGBC Green Homes, with the possibility of achieving full credit points, but the combinations discussed did not give the full credit points for GRIHA. GRIHA, in particular, requires a significant reduction in HVAC load to receive full credit. GRIHA requires more renewable energy allocation than IGBC GH because renewable energy for achieving credit points is a percentage of HVAC, lighting, and domestic hot water consumption, whereas IGBC GH is a percentage of common area lighting consumption. © 2022, The Institution of Engineers (India).Item An Integrated Approach of Life Cycle Cost and Life Cycle Energy for Energy Efficiency Measures in Residential Buildings(Springer Science and Business Media Deutschland GmbH, 2025) Rakesh, P.; Das, B.B.In India, the use of energy efficiency measures in small residential buildings is limited because of the negative impression of high initial cost. Very few studies have been conducted on energy efficiency measures in buildings and their long-run benefits. This research primarily investigates the influence of various parameters on the energy performance, the life cycle cost (LCC) and the life cycle energy (LCE) of residential buildings through energy simulations. This study tried to establish the trade-off between initial cost and the operating cost and also the trade-off between embodied energy and operational energy for different envelope conditions. This research also aims to demonstrate the long-run benefits of using energy efficiency measures concerning LCC and LCE in residential buildings. The different efficiency measures used in a single-family residential building include, roof insulation, alternate wall envelope material and HVAC (heating, ventilation and air conditioning) efficiency. The use of materials with low thermal transmittance (U-value) value in building envelope was found to be very beneficial in lowering energy consumption, especially the cooling and heating loads. HVAC efficiency was observed to have a substantial role in reducing the energy consumption. When the mentioned combinations were combined, a massive drop of 27.61% in the energy consumption was observed, which resulted in substantial savings in LCC and LCE. The importance of choosing the building envelope materials and parameters was evident from the compliance check with ECBC–R (energy conservation code for residential buildings) of the single-family residential building. © The Author(s), under exclusive licence to Shiraz University 2024.