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Beomjoon Lee
Thermal Energy Systems Laboratory, Korea Institute of Energy Research, Daejeon 305-343, Korea

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Journal article
Published: 09 November 2020 in Energies
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An ejector is a simple mechanical device that can be integrated with power generation or the refrigeration cycle to enhance their performance. Owing to the complex flow behavior in the ejector, the performance prediction of the ejector is done by numerical simulations. However, to evaluate the performance of an ejector integrated power cycle or refrigeration cycle, the need for simpler and more reliable thermodynamic models to estimate the performance of the ejector persists. This research, therefore, aims at developing a single mathematical correlation that can predict the ejector performance with reasonable accuracy. The proposed correlation relates the entrainment ratio and the pressure rise across the ejector to the area ratio and the mass flow rate of the primary flow. R141b is selected as the ejector refrigerant, and the results obtained through the proposed correlation are validated through numerical solutions. The comparison between the analytical and numerical with experimental results provided an error of less than 8.4% and 4.29%, respectively.

ACS Style

Hafiz Ali Muhammad; Hafiz Muhammad Abdullah; Zabdur Rehman; Beomjoon Lee; Young-Jin Baik; Jongjae Cho; Muhammad Imran; Manzar Masud; Mohsin Saleem; Muhammad Shoaib Butt. Numerical Modeling of Ejector and Development of Improved Methods for the Design of Ejector-Assisted Refrigeration System. Energies 2020, 13, 5835 .

AMA Style

Hafiz Ali Muhammad, Hafiz Muhammad Abdullah, Zabdur Rehman, Beomjoon Lee, Young-Jin Baik, Jongjae Cho, Muhammad Imran, Manzar Masud, Mohsin Saleem, Muhammad Shoaib Butt. Numerical Modeling of Ejector and Development of Improved Methods for the Design of Ejector-Assisted Refrigeration System. Energies. 2020; 13 (21):5835.

Chicago/Turabian Style

Hafiz Ali Muhammad; Hafiz Muhammad Abdullah; Zabdur Rehman; Beomjoon Lee; Young-Jin Baik; Jongjae Cho; Muhammad Imran; Manzar Masud; Mohsin Saleem; Muhammad Shoaib Butt. 2020. "Numerical Modeling of Ejector and Development of Improved Methods for the Design of Ejector-Assisted Refrigeration System." Energies 13, no. 21: 5835.

Journal article
Published: 20 January 2020 in Energy Conversion and Management
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CO2 compression process significantly contributes to the overall efficiency penalty resulting from carbon capture and storage (CCS) process. In this study, heat-pump (HP)-assisted CO2 compression configurations are examined using first and second laws of thermodynamics to reduce power consumption during CO2 compression. The performance is quantified in terms of net electric power consumption and compared with the conventional multi-stage compression. The input boundary conditions required for the proposed configurations modeling such as captured CO2 pressure, CO2 required pressure, the number of stages or the pressure ratio during CO2 compression, and cooling temperature depend on the plant configuration, location, and compression chain characteristics. This study emphasizes that the variability in boundary conditions can significantly impact the optimum thermodynamic route of CO2 pressurization. A thorough parametric investigation is thus performed to clarify the impact of these parameters on the overall power consumption. CO2 pumping or compression near the critical point was shown to play a key role in optimizing CO2 pressurization routes. Additionally, a high CO2 captured pressure and a low target pressure, number of stages, and cooling temperature were shown to enhance system performance. Furthermore, the second law analysis illustrated that the point of minimum net power consumption corresponds to the minimum exergy destruction. Finally, the optimization of the proposed system using a genetic algorithm allowed for a 7.77% electric power saving and 68.02% exergetic efficiency using the proposed system.

ACS Style

Hafiz Ali Muhammad; Chulwoo Roh; Jongjae Cho; Zabdur Rehman; Haider Sultan; Young-Jin Baik; Beomjoon Lee. A comprehensive thermodynamic performance assessment of CO2 liquefaction and pressurization system using a heat pump for carbon capture and storage (CCS) process. Energy Conversion and Management 2020, 206, 112489 .

AMA Style

Hafiz Ali Muhammad, Chulwoo Roh, Jongjae Cho, Zabdur Rehman, Haider Sultan, Young-Jin Baik, Beomjoon Lee. A comprehensive thermodynamic performance assessment of CO2 liquefaction and pressurization system using a heat pump for carbon capture and storage (CCS) process. Energy Conversion and Management. 2020; 206 ():112489.

Chicago/Turabian Style

Hafiz Ali Muhammad; Chulwoo Roh; Jongjae Cho; Zabdur Rehman; Haider Sultan; Young-Jin Baik; Beomjoon Lee. 2020. "A comprehensive thermodynamic performance assessment of CO2 liquefaction and pressurization system using a heat pump for carbon capture and storage (CCS) process." Energy Conversion and Management 206, no. : 112489.

Journal article
Published: 20 May 2019 in Energy Conversion and Management
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An innovative CO2 pressurization system combined with supercritical CO2 (sCO2) open power cycle is proposed in this study. The combined system reduced the power demand associated with CO2 pressurization in the CO2 capture and storage (CCS) process as well as utilized the captured CO2 in a sCO2 power cycle to generate power. As the first step, conventional multi-stage compression was complemented with CO2 liquefaction and pumping to reduce the compression power. Later, a waste heat-powered recuperative sCO2 power cycle was employed to generate additional electric power. The vapor compression cycle (VCC) was first modeled, validated, and explored for CO2 liquefaction and pumping. Refrigerants R717, R134a, R290, and R32 were analyzed as the VCC working fluid. An initial thermodynamic analysis was performed to identify the most influential liquefaction parameters. Then, a genetic algorithm optimization module in MATLAB was used to minimize the overall power consumption in the VCC. The VCC was integrated with a sCO2 cycle to utilize the high pressure CO2, and after optimizing the VCC, the performance of the sCO2 cycle was evaluated. Results of our study revealed that integrating the sCO2 cycle with a CO2 liquefaction and pumping cycle reduced power consumption by 13.88% compared to conventional multi-stage compression. Finally, sensitivity analysis with respect to the crucial thermodynamic parameter was also performed.

ACS Style

Hafiz Ali Muhammad; Gilbong Lee; Junhyun Cho; Umair H. Bhatti; Young-Jin Baik; Beomjoon Lee. Design and optimization of CO2 pressurization system integrated with a supercritical CO2 power cycle for the CO2 capture and storage system. Energy Conversion and Management 2019, 195, 609 -619.

AMA Style

Hafiz Ali Muhammad, Gilbong Lee, Junhyun Cho, Umair H. Bhatti, Young-Jin Baik, Beomjoon Lee. Design and optimization of CO2 pressurization system integrated with a supercritical CO2 power cycle for the CO2 capture and storage system. Energy Conversion and Management. 2019; 195 ():609-619.

Chicago/Turabian Style

Hafiz Ali Muhammad; Gilbong Lee; Junhyun Cho; Umair H. Bhatti; Young-Jin Baik; Beomjoon Lee. 2019. "Design and optimization of CO2 pressurization system integrated with a supercritical CO2 power cycle for the CO2 capture and storage system." Energy Conversion and Management 195, no. : 609-619.