Performance of a 250 kW Organic Rankine Cycle System for Off-Design Heat Source Conditions
An organic Rankine cycle system comprised of a preheater, evaporator, condenser, turbine, generator, and pump was used to study its off-design performance and the operational control strategy. R245fa was used as the working fluid. Under the design conditions, the net power output is 243 kW and the s...
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| Format: | Article |
| Language: | English |
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MDPI AG
2014-06-01
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| Series: | Energies |
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| Online Access: | http://www.mdpi.com/1996-1073/7/6/3684 |
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| author | Ben-Ran Fu Sung-Wei Hsu Yuh-Ren Lee Jui-Ching Hsieh Chia-Ming Chang Chih-Hsi Liu |
| author_facet | Ben-Ran Fu Sung-Wei Hsu Yuh-Ren Lee Jui-Ching Hsieh Chia-Ming Chang Chih-Hsi Liu |
| author_sort | Ben-Ran Fu |
| collection | DOAJ |
| description | An organic Rankine cycle system comprised of a preheater, evaporator, condenser, turbine, generator, and pump was used to study its off-design performance and the operational control strategy. R245fa was used as the working fluid. Under the design conditions, the net power output is 243 kW and the system thermal efficiency is 9.5%. For an off-design heat source flow rate (mW), the operating pressure was controlled to meet the condition that the R245fa reached the liquid and vapor saturation states at the outlet of the preheater and the evaporator, respectively. The analytical results demonstrated that the operating pressure increased with increasing mW; a higher mW yielded better heat transfer performance of the preheater and required a smaller evaporator heat capacity, and the net power output and system thermal efficiency increased with increasing mW. For the range of mW studied here, the net power output increased by 64.0% while the total heat transfer rate increased by only 9.2%. In summary, off-design operation of the system was examined for a heat source flow rate which varied by –39.0% to +78.0% from the designed rate, resulting in –29.2% to +16.0% and –25.3% to +12.6% variations in the net power output and system thermal efficiency, respectively. |
| first_indexed | 2024-04-11T22:32:54Z |
| format | Article |
| id | doaj.art-6d8e84b8c0914ba4b723ca1b9f3a6745 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-11T22:32:54Z |
| publishDate | 2014-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-6d8e84b8c0914ba4b723ca1b9f3a67452022-12-22T03:59:17ZengMDPI AGEnergies1996-10732014-06-01763684369410.3390/en7063684en7063684Performance of a 250 kW Organic Rankine Cycle System for Off-Design Heat Source ConditionsBen-Ran Fu0Sung-Wei Hsu1Yuh-Ren Lee2Jui-Ching Hsieh3Chia-Ming Chang4Chih-Hsi Liu5Green Energy and Environment Research Laboratories, Industrial Technology Research Institute, Hsinchu 31040, TaiwanGreen Energy and Environment Research Laboratories, Industrial Technology Research Institute, Hsinchu 31040, TaiwanGreen Energy and Environment Research Laboratories, Industrial Technology Research Institute, Hsinchu 31040, TaiwanGreen Energy and Environment Research Laboratories, Industrial Technology Research Institute, Hsinchu 31040, TaiwanGreen Energy and Environment Research Laboratories, Industrial Technology Research Institute, Hsinchu 31040, TaiwanGreen Energy and Environment Research Laboratories, Industrial Technology Research Institute, Hsinchu 31040, TaiwanAn organic Rankine cycle system comprised of a preheater, evaporator, condenser, turbine, generator, and pump was used to study its off-design performance and the operational control strategy. R245fa was used as the working fluid. Under the design conditions, the net power output is 243 kW and the system thermal efficiency is 9.5%. For an off-design heat source flow rate (mW), the operating pressure was controlled to meet the condition that the R245fa reached the liquid and vapor saturation states at the outlet of the preheater and the evaporator, respectively. The analytical results demonstrated that the operating pressure increased with increasing mW; a higher mW yielded better heat transfer performance of the preheater and required a smaller evaporator heat capacity, and the net power output and system thermal efficiency increased with increasing mW. For the range of mW studied here, the net power output increased by 64.0% while the total heat transfer rate increased by only 9.2%. In summary, off-design operation of the system was examined for a heat source flow rate which varied by –39.0% to +78.0% from the designed rate, resulting in –29.2% to +16.0% and –25.3% to +12.6% variations in the net power output and system thermal efficiency, respectively.http://www.mdpi.com/1996-1073/7/6/3684organic Rankine cycleoff-design conditionsthermal efficiency |
| spellingShingle | Ben-Ran Fu Sung-Wei Hsu Yuh-Ren Lee Jui-Ching Hsieh Chia-Ming Chang Chih-Hsi Liu Performance of a 250 kW Organic Rankine Cycle System for Off-Design Heat Source Conditions Energies organic Rankine cycle off-design conditions thermal efficiency |
| title | Performance of a 250 kW Organic Rankine Cycle System for Off-Design Heat Source Conditions |
| title_full | Performance of a 250 kW Organic Rankine Cycle System for Off-Design Heat Source Conditions |
| title_fullStr | Performance of a 250 kW Organic Rankine Cycle System for Off-Design Heat Source Conditions |
| title_full_unstemmed | Performance of a 250 kW Organic Rankine Cycle System for Off-Design Heat Source Conditions |
| title_short | Performance of a 250 kW Organic Rankine Cycle System for Off-Design Heat Source Conditions |
| title_sort | performance of a 250 kw organic rankine cycle system for off design heat source conditions |
| topic | organic Rankine cycle off-design conditions thermal efficiency |
| url | http://www.mdpi.com/1996-1073/7/6/3684 |
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