Next Article in Journal
Macro and Micro Properties of Organic Matter in Hydraulic Mud Consolidation
Next Article in Special Issue
A Preliminary Investigation of the Effect of Ocean Thermal Energy Conversion (OTEC) Effluent Discharge Options on Global OTEC Resources
Previous Article in Journal / Special Issue
Determination of the Potential Thermal Gradient for the Mexican Pacific Ocean
Article Menu
Issue 1 (March) cover image

Export Article

Open AccessFeature PaperArticle
J. Mar. Sci. Eng. 2018, 6(1), 21; https://doi.org/10.3390/jmse6010021

Ocean Thermal Energy Conversion Using Double-Stage Rankine Cycle

Institute of Ocean Energy, Main Center, Saga University, 1-Honjo machi, Saga-shi, Saga 840-8502, Japan
*
Author to whom correspondence should be addressed.
Received: 31 December 2017 / Revised: 2 February 2018 / Accepted: 21 February 2018 / Published: 1 March 2018
(This article belongs to the Special Issue Ocean Thermal Energy Conversion)
Full-Text   |   PDF [4677 KB, uploaded 1 March 2018]   |  

Abstract

Ocean Thermal Energy Conversion (OTEC) using non-azeotropic mixtures such as ammonia/water as working fluid and the multistage cycle has been investigated in order to improve the thermal efficiency of the cycle because of small ocean temperature differences. The performance and effectiveness of the multistage cycle are barely understood. In addition, previous evaluation methods of heat exchange process cannot clearly indicate the influence of the thermophysical characteristics of the working fluid on the power output. Consequently, this study investigated the influence of reduction of the irreversible losses in the heat exchange process on the system performance in double-stage Rankine cycle using pure working fluid. Single Rankine, double-stage Rankine and Kalina cycles were analyzed to ascertain the system characteristics. The simple evaluation method of the temperature difference between the working fluid and the seawater is applied to this analysis. From the results of the parametric performance analysis it can be considered that double-stage Rankine cycle using pure working fluid can reduce the irreversible losses in the heat exchange process as with the Kalina cycle using an ammonia/water mixture. Considering the maximum power efficiency obtained in the study, double-stage Rankine and Kalina cycles can improve the power output by reducing the irreversible losses in the cycle. View Full-Text
Keywords: heat exchange process; Kalina cycle; double-stage Rankine cycle; ocean thermal energy conversion; parametric performance analysis heat exchange process; Kalina cycle; double-stage Rankine cycle; ocean thermal energy conversion; parametric performance analysis
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Ikegami, Y.; Yasunaga, T.; Morisaki, T. Ocean Thermal Energy Conversion Using Double-Stage Rankine Cycle. J. Mar. Sci. Eng. 2018, 6, 21.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
J. Mar. Sci. Eng. EISSN 2077-1312 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top