Thermodynamic Analysis of Expansion Profile for Displacement-type Expander in Low-temperature Rankine Cycle
Thermodynamic analysis of the isentropic and polytropic expansion profiles of typical working fluids was carried out in order to design a highly efficient displacement-type expander for a low-temperature Rankine cycle. First, expansion profiles were analyzed for three typical working fluids: HFC245f...
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| Main Authors: | , |
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| Format: | Article |
| Language: | en |
| Published: |
The Japan Society of Mechanical Engineers and The Heat Transfer Society of Japan
2010
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| Online Access: | http://eprints.utem.edu.my/id/eprint/6507/1/Journal_of_Thermal_Science_ad_Thechnology.pdf http://eprints.utem.edu.my/id/eprint/6507/ |
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| Summary: | Thermodynamic analysis of the isentropic and polytropic expansion profiles of typical working fluids was carried out in order to design a highly efficient displacement-type expander for a low-temperature Rankine cycle. First, expansion profiles were analyzed for three typical working fluids: HFC245fa, ammonia, and supercritical CO 2. The hot-side temperature ranged from 60 ° to 120 °C, and the cold-side temperature was 10 °C. In the analysis, isentropic and polytropic expansion processes were assumed to behave thermodynamically. In the analysis results, we noted similarities among the expansion profiles for different hot-side temperatures. This similarity allowed us to introduce the unique concept of a variable mechanism for expansion profile fitting in displacement-type expanders. This variable expansion mechanism can be achieved by simply adjusting the position of the inlet and/or outlet port of the expander. © 2010 by JSME. |
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