Analysis of a 50 kW Organic Rankine Cycle System
| Autor: | Chang, Kai-Han, 張凱涵 |
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| Rok vydání: | 2011 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 99 This study analyzes the system performance of a 50kW ORC system subject to influence of various working fluids. This study proposes a dimensionless “figure of merit” which combines the Jakob number, condensing temperature, and evaporation temperature that is quite helpful for screening of working fluid as far as thermal efficiency is concerned. The thermal efficiency normally decreases with the rise of figure of merit, and the proposed figure of merit is not only applicable for the present eighteen working fluids but is also in line with some existing literatures. Analysis of the typical ORC heat exchangers indicates that the dominant thermal resistance in the shell-and-tube condenser is on the shell side. Similarly, the dominant resistance is also on the refrigerant side for the plate evaporator. However, there is a huge difference of thermal resistance in the preheating zone whereas only minor difference in the evaporation region. A better way to resolve the extremely uneven resistance distribution is to use a separate preheater incorporating significant augmentation in the working fluid side and connected it to a much smaller plate heat exchanger. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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