Exergy analysis of a combined power cycle using low-grade heat source and LNG cold energy
- Authors
- Kim, Kyung Chun; Ha, Jong Man; Kim, Kyoung Hoon
- Issue Date
- 2015
- Publisher
- INDERSCIENCE ENTERPRISES LTD
- Keywords
- low-grade heat source; LNG cold energy; ammonia-water Rankine cycle; exergy; exergy destruction
- Citation
- INTERNATIONAL JOURNAL OF EXERGY, v.17, no.3, pp 374 - 400
- Pages
- 27
- Journal Title
- INTERNATIONAL JOURNAL OF EXERGY
- Volume
- 17
- Number
- 3
- Start Page
- 374
- End Page
- 400
- URI
- https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/22465
- DOI
- 10.1504/IJEX.2015.070504
- ISSN
- 1742-8297
1742-8300
- Abstract
- This paper presents a comparative exergy analysis based on the second law of thermodynamics for a combined power generation cycle using a low grade heat source and LNG cold energy. The combined cycle consists of a LNG power cycle and an ammonia-water Rankine cycle with (R) and without regeneration (S). The effects of system parameters on the exergy destruction at each component as well as the total exergy efficiency are investigated extensively. A characteristic exergy efficiency-work diagram is proposed to consider the two system variables simultaneously. The results indicate that the thermodynamic performance of the combined system is strongly affected by the system parameters. Under the typical operating conditions for a heat source of 200 degrees C, calculated optimal exergy efficiencies are 22.0% (S) and 21.4% (R) for the condensation temperature at T-c = 40 degrees C, and 27.0% (S) and 28.5% (R) for T-c = - 20 degrees C.
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Collections - Department of Mechanical Engineering > 1. Journal Articles
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