Browsing by Author "Rakesh, P."

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    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.
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    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).