The Influence of Changing Hydropower Potential on Performance Parameters of Pumps in Turbine Mode
Pumps as turbines (PAT) are used as an alternative to water turbines in small hydropower plants. The same devices can also be used for energy recovery in water distribution networks. They can replace pressure reduction valves that often lead to energy loss. However, PATs lack the parts that regulate...
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| Format: | Article |
| Language: | English |
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MDPI AG
2019-06-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/12/11/2103 |
| _version_ | 1798039436594774016 |
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| author | Martin Polák |
| author_facet | Martin Polák |
| author_sort | Martin Polák |
| collection | DOAJ |
| description | Pumps as turbines (PAT) are used as an alternative to water turbines in small hydropower plants. The same devices can also be used for energy recovery in water distribution networks. They can replace pressure reduction valves that often lead to energy loss. However, PATs lack the parts that regulate flow so that when a hydropower potential change occurs, efficiency is reduced, as is economic gain. This article summarizes the influence of changing hydropower potential on PAT efficiency and presents comparisons of experimental results with the commonly used predictive model stemming from the theory of physical similarity, which presumes constant PAT efficiency. Our research indicates that the deviation between the model and the real power output calculation at varying potentials was minimal. Similarly, the affine parabola can be used to determine the relationship between total head and flow rate. Other relationships differ from reality the more the PAT efficiency changes. The flow rate and total head dependence on shaft speed are the main factors when setting the optimum operational parameters at varying hydropower potentials. Therefore, a change in efficiency must be included in predictive calculations to correctly optimize PAT operation. The problem is that a change in efficiency cannot be reliably predicted in advance, especially in the case of small-scale devices. For this reason, further research on the issue of changes in PAT efficiency is necessary. |
| first_indexed | 2024-04-11T21:53:52Z |
| format | Article |
| id | doaj.art-36b3c18cf2d4443b85b6ca9724200db7 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-11T21:53:52Z |
| publishDate | 2019-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-36b3c18cf2d4443b85b6ca9724200db72022-12-22T04:01:10ZengMDPI AGEnergies1996-10732019-06-011211210310.3390/en12112103en12112103The Influence of Changing Hydropower Potential on Performance Parameters of Pumps in Turbine ModeMartin Polák0Faculty of Engineering, Czech University of Life SciencesPrague, Kamýcká 129, 165 21 Praha 6, Czech RepublicPumps as turbines (PAT) are used as an alternative to water turbines in small hydropower plants. The same devices can also be used for energy recovery in water distribution networks. They can replace pressure reduction valves that often lead to energy loss. However, PATs lack the parts that regulate flow so that when a hydropower potential change occurs, efficiency is reduced, as is economic gain. This article summarizes the influence of changing hydropower potential on PAT efficiency and presents comparisons of experimental results with the commonly used predictive model stemming from the theory of physical similarity, which presumes constant PAT efficiency. Our research indicates that the deviation between the model and the real power output calculation at varying potentials was minimal. Similarly, the affine parabola can be used to determine the relationship between total head and flow rate. Other relationships differ from reality the more the PAT efficiency changes. The flow rate and total head dependence on shaft speed are the main factors when setting the optimum operational parameters at varying hydropower potentials. Therefore, a change in efficiency must be included in predictive calculations to correctly optimize PAT operation. The problem is that a change in efficiency cannot be reliably predicted in advance, especially in the case of small-scale devices. For this reason, further research on the issue of changes in PAT efficiency is necessary.https://www.mdpi.com/1996-1073/12/11/2103pump as turbine (PAT)efficiencytotal headflow ratepower output |
| spellingShingle | Martin Polák The Influence of Changing Hydropower Potential on Performance Parameters of Pumps in Turbine Mode Energies pump as turbine (PAT) efficiency total head flow rate power output |
| title | The Influence of Changing Hydropower Potential on Performance Parameters of Pumps in Turbine Mode |
| title_full | The Influence of Changing Hydropower Potential on Performance Parameters of Pumps in Turbine Mode |
| title_fullStr | The Influence of Changing Hydropower Potential on Performance Parameters of Pumps in Turbine Mode |
| title_full_unstemmed | The Influence of Changing Hydropower Potential on Performance Parameters of Pumps in Turbine Mode |
| title_short | The Influence of Changing Hydropower Potential on Performance Parameters of Pumps in Turbine Mode |
| title_sort | influence of changing hydropower potential on performance parameters of pumps in turbine mode |
| topic | pump as turbine (PAT) efficiency total head flow rate power output |
| url | https://www.mdpi.com/1996-1073/12/11/2103 |
| work_keys_str_mv | AT martinpolak theinfluenceofchanginghydropowerpotentialonperformanceparametersofpumpsinturbinemode AT martinpolak influenceofchanginghydropowerpotentialonperformanceparametersofpumpsinturbinemode |