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Open AccessArticle

Three Approaches to Low-Duty Turbo Compressor Efficiency Exploitation Evaluation

1
Maritime Department, University of Zadar, Mihovila Pavlinovića 1, 23000 Zadar, Croatia
2
Faculty of Engineering, University of Rijeka, Vukovarska 58, 51000 Rijeka, Croatia
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(10), 3373; https://doi.org/10.3390/app10103373
Received: 27 March 2020 / Revised: 9 May 2020 / Accepted: 9 May 2020 / Published: 13 May 2020
(This article belongs to the Section Energy)
This paper presents three approaches for isentropic, energy, and exergy evaluations of a low-duty liquid natural gas (LNG) vapor turbo compressor during exploitation on a conventional LNG carrier. The evaluation was conducted on the measured performance parameters under 22 various turbo compressor operating regimes. The turbo compressor performance was evaluated in the temperature span from −69 to −105 °C and during changes in the rpm of the main propulsion turbine and, consequently, the main boiler load. The results show that the highest measured turbo compressor isentropic efficiency is in agreement with the manufacturer specifications, equaling 75.23% at a main propulsion turbine rpm of 53.5. At the highest measured loads and rpm, the turbo compressor energy and exergy efficiencies reach the highest values of 57.81% and 28.51%, respectively. In each observed operating regime, the influence of the ambient temperature change on the turbo compressor exergy efficiency was investigated. At the lowest and the highest measured loads, turbo compressor energy and exergy flow streams are presented in a Sankey diagram. Techniques for cargo temperature maintenance during the ship voyage are presented, as the results show that low suction gas temperatures influence turbo compressor efficiency. View Full-Text
Keywords: low-duty turbo compressor; isentropic efficiency; energy analysis; exergy analysis; cargo temperature maintenance low-duty turbo compressor; isentropic efficiency; energy analysis; exergy analysis; cargo temperature maintenance
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MDPI and ACS Style

Poljak, I.; Glavan, I.; Orović, J.; Mrzljak, V. Three Approaches to Low-Duty Turbo Compressor Efficiency Exploitation Evaluation. Appl. Sci. 2020, 10, 3373. https://doi.org/10.3390/app10103373

AMA Style

Poljak I, Glavan I, Orović J, Mrzljak V. Three Approaches to Low-Duty Turbo Compressor Efficiency Exploitation Evaluation. Applied Sciences. 2020; 10(10):3373. https://doi.org/10.3390/app10103373

Chicago/Turabian Style

Poljak, Igor; Glavan, Ivica; Orović, Josip; Mrzljak, Vedran. 2020. "Three Approaches to Low-Duty Turbo Compressor Efficiency Exploitation Evaluation" Appl. Sci. 10, no. 10: 3373. https://doi.org/10.3390/app10103373

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