Performance analysis of an absorption power cycle for ocean thermal energy conversion

Han Yuan, Ning Mei, Peilin Zhou

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

An absorption power cycle with two ejectors is proposed for ocean thermal energy conversion. The ammonia–water is used as the working fluid. The ejectors are driven by vapor and solution from the sub-generator. Based on the first and second law, the mathematical model for this cycle is developed and theoretical analysis is conducted to evaluate the effects of thermodynamic parameters on the performance of this cycle. Results show that the absorption temperature is increased by 2.0–6.5 _C by employing the two-stage ejector sub-cycle, which indicates that this proposed cycle can be driven with a lower temperature difference. Further, the thermal efficiency, net thermal efficiency and exergy efficiency of this cycle can reach to 4.17%, 3.10% and 39.92% respectively. Besides, the generation pressure, the heating source temperature, the solution concentration, and the expansion ratio, as well as the entrainment ratio of the first stage ejector have significant effects on the absorption temperature, the thermal efficiency, the exergy efficiency and the exergy loss of this cycle. In addition, 49.80% of exergy loss in this proposed cycle occurs in the generators and reheater, followed by the ejectors of 36.12%.
LanguageEnglish
Pages199-207
Number of pages9
JournalEnergy Conversion and Management
Volume87
Early online date26 Jul 2014
DOIs
Publication statusPublished - Nov 2014

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Ocean thermal energy conversion
Exergy
Temperature
Ammonia
Vapors
Thermodynamics
Mathematical models
Heating
Fluids
Hot Temperature
Water

Keywords

  • ocean thermal energy conversion
  • ammonia-water adsorption
  • power cycle
  • ejector
  • energy efficiency
  • exergy efficiency

Cite this

@article{2fa68c131635472bad61e407c2c8c700,
title = "Performance analysis of an absorption power cycle for ocean thermal energy conversion",
abstract = "An absorption power cycle with two ejectors is proposed for ocean thermal energy conversion. The ammonia–water is used as the working fluid. The ejectors are driven by vapor and solution from the sub-generator. Based on the first and second law, the mathematical model for this cycle is developed and theoretical analysis is conducted to evaluate the effects of thermodynamic parameters on the performance of this cycle. Results show that the absorption temperature is increased by 2.0–6.5 _C by employing the two-stage ejector sub-cycle, which indicates that this proposed cycle can be driven with a lower temperature difference. Further, the thermal efficiency, net thermal efficiency and exergy efficiency of this cycle can reach to 4.17{\%}, 3.10{\%} and 39.92{\%} respectively. Besides, the generation pressure, the heating source temperature, the solution concentration, and the expansion ratio, as well as the entrainment ratio of the first stage ejector have significant effects on the absorption temperature, the thermal efficiency, the exergy efficiency and the exergy loss of this cycle. In addition, 49.80{\%} of exergy loss in this proposed cycle occurs in the generators and reheater, followed by the ejectors of 36.12{\%}.",
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Performance analysis of an absorption power cycle for ocean thermal energy conversion. / Yuan, Han; Mei, Ning; Zhou, Peilin.

In: Energy Conversion and Management, Vol. 87, 11.2014, p. 199-207.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Performance analysis of an absorption power cycle for ocean thermal energy conversion

AU - Yuan, Han

AU - Mei, Ning

AU - Zhou, Peilin

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N2 - An absorption power cycle with two ejectors is proposed for ocean thermal energy conversion. The ammonia–water is used as the working fluid. The ejectors are driven by vapor and solution from the sub-generator. Based on the first and second law, the mathematical model for this cycle is developed and theoretical analysis is conducted to evaluate the effects of thermodynamic parameters on the performance of this cycle. Results show that the absorption temperature is increased by 2.0–6.5 _C by employing the two-stage ejector sub-cycle, which indicates that this proposed cycle can be driven with a lower temperature difference. Further, the thermal efficiency, net thermal efficiency and exergy efficiency of this cycle can reach to 4.17%, 3.10% and 39.92% respectively. Besides, the generation pressure, the heating source temperature, the solution concentration, and the expansion ratio, as well as the entrainment ratio of the first stage ejector have significant effects on the absorption temperature, the thermal efficiency, the exergy efficiency and the exergy loss of this cycle. In addition, 49.80% of exergy loss in this proposed cycle occurs in the generators and reheater, followed by the ejectors of 36.12%.

AB - An absorption power cycle with two ejectors is proposed for ocean thermal energy conversion. The ammonia–water is used as the working fluid. The ejectors are driven by vapor and solution from the sub-generator. Based on the first and second law, the mathematical model for this cycle is developed and theoretical analysis is conducted to evaluate the effects of thermodynamic parameters on the performance of this cycle. Results show that the absorption temperature is increased by 2.0–6.5 _C by employing the two-stage ejector sub-cycle, which indicates that this proposed cycle can be driven with a lower temperature difference. Further, the thermal efficiency, net thermal efficiency and exergy efficiency of this cycle can reach to 4.17%, 3.10% and 39.92% respectively. Besides, the generation pressure, the heating source temperature, the solution concentration, and the expansion ratio, as well as the entrainment ratio of the first stage ejector have significant effects on the absorption temperature, the thermal efficiency, the exergy efficiency and the exergy loss of this cycle. In addition, 49.80% of exergy loss in this proposed cycle occurs in the generators and reheater, followed by the ejectors of 36.12%.

KW - ocean thermal energy conversion

KW - ammonia-water adsorption

KW - power cycle

KW - ejector

KW - energy efficiency

KW - exergy efficiency

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