Pressure Exchanger for Energy Recovery in a Trans-Critical CO2 Refrigeration System
Abstract
Trans-critical CO2 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.
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1772172
- Alternate Identifier(s):
- OSTI ID: 1788172; OSTI ID: 1817531
- Grant/Contract Number:
- 3535; AC05-00OR22725
- Resource Type:
- Published Article
- Journal Name:
- Energies
- Additional Journal Information:
- Journal Name: Energies Journal Volume: 14 Journal Issue: 6; Journal ID: ISSN 1996-1073
- Publisher:
- MDPI AG
- Country of Publication:
- Switzerland
- Language:
- English
- Subject:
- 30 DIRECT ENERGY CONVERSION; pressure exchanger; trans-critical CO2 refrigeration cycle; energy recovery
Citation Formats
Elatar, Ahmed, Fricke, Brian, Sharma, Vishaldeep, and Nawaz, Kashif. Pressure Exchanger for Energy Recovery in a Trans-Critical CO2 Refrigeration System. Switzerland: N. p., 2021.
Web. doi:10.3390/en14061754.
Elatar, Ahmed, Fricke, Brian, Sharma, Vishaldeep, & Nawaz, Kashif. Pressure Exchanger for Energy Recovery in a Trans-Critical CO2 Refrigeration System. Switzerland. https://doi.org/10.3390/en14061754
Elatar, Ahmed, Fricke, Brian, Sharma, Vishaldeep, and Nawaz, Kashif. Mon .
"Pressure Exchanger for Energy Recovery in a Trans-Critical CO2 Refrigeration System". Switzerland. https://doi.org/10.3390/en14061754.
@article{osti_1772172,
title = {Pressure Exchanger for Energy Recovery in a Trans-Critical CO2 Refrigeration System},
author = {Elatar, Ahmed and Fricke, Brian and Sharma, Vishaldeep and Nawaz, Kashif},
abstractNote = {Trans-critical CO2 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.},
doi = {10.3390/en14061754},
journal = {Energies},
number = 6,
volume = 14,
place = {Switzerland},
year = {Mon Mar 22 00:00:00 EDT 2021},
month = {Mon Mar 22 00:00:00 EDT 2021}
}
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