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https://doi.org/10.1016/j.ecmx.2021.100121
Title: | Analysis and optimization of a modified Kalina cycle system for low-grade heat utilization | Authors: | Masrur Hossain, Mohammad Afnan Ahmed, Niyaz Abid Shahriyar, Md Monjurul Ehsan M. Riaz, Fahid Salehin, Sayedus Awais Salman, Chaudhary |
Keywords: | Kalina cycle system Low-grade thermal source Multi-phase expander Thermodynamic analysis |
Issue Date: | 1-Oct-2021 | Publisher: | Elsevier Ltd | Citation: | Masrur Hossain, Mohammad, Afnan Ahmed, Niyaz, Abid Shahriyar, Md, Monjurul Ehsan M., Riaz, Fahid, Salehin, Sayedus, Awais Salman, Chaudhary (2021-10-01). Analysis and optimization of a modified Kalina cycle system for low-grade heat utilization. Energy Conversion and Management: X 12 : 100121. ScholarBank@NUS Repository. https://doi.org/10.1016/j.ecmx.2021.100121 | Rights: | Attribution 4.0 International | Abstract: | Kalina cycle system (KCS) offers an attractive prospect to produce power by utilizing low-grade heat sources where traditional power cycles cannot be implemented. Intending to explore the potential of exploiting low-grade heat sources for conversion to electrical energy, this study proposes two modified power generation cycles based on KCS-34. A multi-phase expander is positioned between the Kalina separator and the second heat regenerator in the proposed X-modification. In contrast, it is located between the mixer and second regenerator for Y-modification. To explore the potential benefits and limitations of the proposed modifications contrasted with the KCS-34, thermodynamic modeling and optimization have been conducted. The influence of critical decision parameters on overall cycle performance is analyzed. The result elucidates that by implementing an additional multi-phase expander, a significant amount of energy can be extracted from a lean ammonia water loop and X-modification can deliver superior thermodynamic performance compared with the Y-modification and the original KCS-34. With a reduced turbine inlet pressure of 58 bar and an ammonia concentration of 80%, the X-modified cycle's efficiency reaches a peak value of 17% and a net power yield of 1015 kW. An increase of 6.35% can be achieved compared with the conventional KCS-34 operating at the same conditions. Maximum exergy destruction of the working substance was observed in the condenser. © 2021 The Author(s) | Source Title: | Energy Conversion and Management: X | URI: | https://scholarbank.nus.edu.sg/handle/10635/232999 | ISSN: | 2590-1745 | DOI: | 10.1016/j.ecmx.2021.100121 | Rights: | Attribution 4.0 International |
Appears in Collections: | Staff Publications Elements |
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