Pressure Exchanger for Energy Recovery in a Trans-Critical CO<sub>2</sub> Refrigeration System
Trans-critical CO<sub>2</sub> vapor compression (VC) refrigeration cycles require a high compression ratio, which is associated with high expansion losses. To recover these expansion losses, a pressure exchange process between the low- and high-pressure sides of the VC cycle is proposed...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-03-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/14/6/1754 |
| _version_ | 1827697054208491520 |
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| author | Ahmed Elatar Brian Fricke Vishaldeep Sharma Kashif Nawaz |
| author_facet | Ahmed Elatar Brian Fricke Vishaldeep Sharma Kashif Nawaz |
| author_sort | Ahmed Elatar |
| collection | DOAJ |
| description | Trans-critical CO<sub>2</sub> vapor compression (VC) refrigeration cycles require a high compression ratio, which is associated with high expansion losses. To recover these expansion losses, a pressure exchange process between the low- and high-pressure sides of the VC cycle is proposed and examined in this study. The proposed pressure exchange system is an open type constant volume process where the high- and low-pressure flows mix inside the system. This prototype is inspired by the pressure exchangers used in reverse-osmosis (RO) desalination systems. In this system, a 2D model was generated and modeled using the computational fluid dynamics (CFD) technique. The numerical model ignored any losses due to leakage or hydraulic friction and the process is considered adiabatic. For the modeling, it was assumed that the inlet conditions for the two pressure exchanger flows are similar to the flow conditions at the evaporator and gas cooler outlets in a VC cycle. Two parameters are examined to test the validity of the system and understand their effect on the performance, including the inlet flow rate represented by the inlet velocity and the process time represented by the speed of rotation. A total of nine cases were simulated and analyzed in this study. |
| first_indexed | 2024-03-10T13:00:52Z |
| format | Article |
| id | doaj.art-511d4335b0f74968b3b10f18dd348368 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-10T13:00:52Z |
| publishDate | 2021-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-511d4335b0f74968b3b10f18dd3483682023-11-21T11:29:17ZengMDPI AGEnergies1996-10732021-03-01146175410.3390/en14061754Pressure Exchanger for Energy Recovery in a Trans-Critical CO<sub>2</sub> Refrigeration SystemAhmed Elatar0Brian Fricke1Vishaldeep Sharma2Kashif Nawaz3Oak Ridge National Laboratory, Oak Ridge, TN 37830, USAOak Ridge National Laboratory, Oak Ridge, TN 37830, USAOak Ridge National Laboratory, Oak Ridge, TN 37830, USAOak Ridge National Laboratory, Oak Ridge, TN 37830, USATrans-critical CO<sub>2</sub> vapor compression (VC) refrigeration cycles require a high compression ratio, which is associated with high expansion losses. To recover these expansion losses, a pressure exchange process between the low- and high-pressure sides of the VC cycle is proposed and examined in this study. The proposed pressure exchange system is an open type constant volume process where the high- and low-pressure flows mix inside the system. This prototype is inspired by the pressure exchangers used in reverse-osmosis (RO) desalination systems. In this system, a 2D model was generated and modeled using the computational fluid dynamics (CFD) technique. The numerical model ignored any losses due to leakage or hydraulic friction and the process is considered adiabatic. For the modeling, it was assumed that the inlet conditions for the two pressure exchanger flows are similar to the flow conditions at the evaporator and gas cooler outlets in a VC cycle. Two parameters are examined to test the validity of the system and understand their effect on the performance, including the inlet flow rate represented by the inlet velocity and the process time represented by the speed of rotation. A total of nine cases were simulated and analyzed in this study.https://www.mdpi.com/1996-1073/14/6/1754pressure exchangertrans-critical CO<sub>2</sub> refrigeration cycleenergy recovery |
| spellingShingle | Ahmed Elatar Brian Fricke Vishaldeep Sharma Kashif Nawaz Pressure Exchanger for Energy Recovery in a Trans-Critical CO<sub>2</sub> Refrigeration System Energies pressure exchanger trans-critical CO<sub>2</sub> refrigeration cycle energy recovery |
| title | Pressure Exchanger for Energy Recovery in a Trans-Critical CO<sub>2</sub> Refrigeration System |
| title_full | Pressure Exchanger for Energy Recovery in a Trans-Critical CO<sub>2</sub> Refrigeration System |
| title_fullStr | Pressure Exchanger for Energy Recovery in a Trans-Critical CO<sub>2</sub> Refrigeration System |
| title_full_unstemmed | Pressure Exchanger for Energy Recovery in a Trans-Critical CO<sub>2</sub> Refrigeration System |
| title_short | Pressure Exchanger for Energy Recovery in a Trans-Critical CO<sub>2</sub> Refrigeration System |
| title_sort | pressure exchanger for energy recovery in a trans critical co sub 2 sub refrigeration system |
| topic | pressure exchanger trans-critical CO<sub>2</sub> refrigeration cycle energy recovery |
| url | https://www.mdpi.com/1996-1073/14/6/1754 |
| work_keys_str_mv | AT ahmedelatar pressureexchangerforenergyrecoveryinatranscriticalcosub2subrefrigerationsystem AT brianfricke pressureexchangerforenergyrecoveryinatranscriticalcosub2subrefrigerationsystem AT vishaldeepsharma pressureexchangerforenergyrecoveryinatranscriticalcosub2subrefrigerationsystem AT kashifnawaz pressureexchangerforenergyrecoveryinatranscriticalcosub2subrefrigerationsystem |