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Buildings are now considered as investments, everyone is interestd in. But they end up consuming lot of energy, hence its performance is necessary to be checked. Building performance can best analysed by keeping a close watch on the bulding operations and the exergy analysis is a better and comprehensive way to understand it in totality. Buildings have now a days become the largest producer of green house gases, thus making them a potential option for analysis. This is why national and international organizations have joined hands to raise governances to carryout symbolic proposals in building's sustainability, energy efficiency and environmental protection. The energy consumption due to thermal loads can be minimized by effective and judicious use of building resources which includes building design and its operations. The present communication deals with the detailed analysis of a building envelope for four different cases i.e. no insulation on walls and roof and oven dry wood, polyurethane foam and fiberglass as insulation for the roof and walls respectively. The behavior of the building envelope for all the cases, with the variation of the ambient temperature revealed that the exergy analysis is a quintessential analyzing the buildings for optimizing their energy consumption. Results revealed that polyurethane (PU) foam can be considered to be the best option for optimum performance from the building envelope.

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The roof and walls in the urban areas contribute to major share in the absorption of solar radiations and also retard the outflow of the absorbed radiation from the building envelope, thereby increasing the global warming by inducing the heat island effect. The impact of using cool roof technologies on the thermal comfort of the office buildings has been estimated. Cool roofs reduce electricity consumption for maintaining the temperature of the air-conditioned buildings in the comfort level and also increase comfort in buildings merely not relying completely on cooling equipment. The cool roofs and cool pavements, however, can mitigate summer urban heat islands by improving indoor air quality and comfort. The thermal analysis of different materials has been carried out to analyze the impact of the rate of heat transfer on the building envelope and the results obtained indicate that different cool roof techniques are beneficial in maintaining the comfort level of the building which purely depends on the ambient temperature conditions.