Exergy

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Exergy ( exergy )

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1­1 Purposes Demand for sophisticated and affordable power generation systems, security of electricity supply in each country and environmental concerns encourage the investigation for cost effective ORC. It is an environmental friendly option to meet this important need. Rural electricity provision for nearly 2 billion people and better waste heat recovery of different industries in addition to Renewable based power generation can benefit from this. Moreover, a comprehensive study on different applications of cycle in different technologies cannot be found and preliminary study shows that ORC applications have been overlooked in many areas. These all give great impetus for this study. As a result, this master thesis is aimed to be a study on economically feasible applications of Organic Rankine cycle and solutions to improve its performance and cost. It is targeted that a market analysis be performed to identify cost effective applications of cycle in different technologies. Classification on produced power range and heat source quality and temperature is set to be implemented to recognize the technology, used working fluids and applied equipment. Each component and process of the cycle in introduced technology will be studied and suggestions will be made to reduce the overall cost, improve the efficiency and power output of cycle. Recommendations for enhancement of solar based ORC system should be given in rather detailed manner. Introduced improvement options are better to be expandable for many other applications to promote the system performance and reduce the costs. 1­2 Overview on Methodology By searching internet commercial websites, digital libraries, brochures from manufacturer and via contacting related companies, necessary data is collected. It includes costs, configurations, power and temperature ranges, and special considerations regarding each ORC technology. Then the gathered data has been sorted and classified. During the evaluation, life cycle cost of ORC, quality and quantity of produced energy and ORC properties as well as its initial cost has been taken into account. Then the components of ORC have been well recognized and some recommendations have been proposed for cost reduction opportunities. In each application, other technologies which can be used alternatively have been introduced and compared with ORC. This causes better understanding of whole system and to identify most proper technology in each application. In some cases the comparison shows the advantages of ORC more clearly. To reach aforementioned goals, equipment of ORC shall be selected properly. The working fluid, ORC speed of turbo machineries, degree of superheat, working minimum and maximum temperatures and pressures are checked in data recourses for some applications. 7

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