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Exergy Analysis of Building Seminar Report
In thermodynamics, the exergy of a system is the maximum useful work possible during a process that brings the system into equilibrium with a heat reservoir. When the surroundings are the reservoir, exergy is the potential of a system to cause a change as it achieves equilibrium with its environment. Exergy is the energy that is available to be used. After the system and surroundings reach equilibrium, the exergy is zero. Determining exergy was also the first goal of thermodynamics.
Buildings account for more than one third of the world’s primary energy demand and a substantial share of this energy is used to maintain room air temperatures at around 200 C. Because of the low temperature level, the actual demand for exergy in space heating and cooling applications is low. In most cases, however, this demand is met by high grade energy sources, such as fossil fuels or electricity. The building sector therefore has a high potential for improving the quality match between energy supply The building energy system includes energy conversion, transportation, final energy consumption and many other phases. However, these studies above have mostly focused on final energy consumption, not making the energy system as a whole, and the energy qualitative difference has not been considered. For analysis of the whole building energy system, it is important to take into account the energy quality and quantity difference. In this regard, exergy analysis method can meet this requirement.
There are number of researches are carried by scientists for different systems. As far as studies conducted on the building energy system form the power plant to the building envelop with exergy analysis are concerned. Dovjak and Shukuya have focused on Slovenian building heating system in different climatic zones with exergy and energy analysis method. Hepbasli has analyzed the performance of greenhouses from the power plant to the envelop for heating system using exergy. Sakulpipatsin have used the exergy method to analyze the HVAC system of an office building equipped with low-temperature heating and high-temperature cooling systems in the Netherlands. Schweiker have compared the potential of building envelop improvements to those of a change in the occupant’s behavioral pattern with exergy analysis for cooling and heating system. Mahlia have used exergy method to analyze day lighting, electric lighting and space cooling systems for a room space in a tropical climate. However, most of these above literatures have only analyzed the heating system from the power plant to the building envelop, seldom dealing with the cooling system. Even if the cooling system has been analyzed, the air chemical exergy for dehumidification demand has not been considered. These studies analyzed the building cooling system with exergy analysis, considering the air chemical exergy. However their analysis has been limited to a constant environmental condition, which is far from most real cases.
The objective of this study is to apply the exergy analysis to an existing heating system from the heating center through waterborne pipe system and heating system to the building envelope to find the possibilities to improve the overall system. This study includes both the exergy analysis of the entire heating system and the exergy analyses of some instruments in that heating system in a detailed manner. The findings are going to be compared with the related previous studies.
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