0
Technical Briefs

Performance Analysis of 15 kW Closed Cycle Ocean Thermal Energy Conversion System With Different Working Fluids

[+] Author and Article Information
Jianying Gong

e-mail: gongjianying@mail.xjtu.edu.cn

Tieyu Gao

e-mail: sunmoon@mail.xjtu.edu.cn

Guojun Li

e-mail: liguojun@mail.xjtu.edu.cn
School of Energy and Power Engineering,
Xi'an Jiaotong University,
Xi'an 710049, China

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the Journal of Solar Energy Engineering. Manuscript received November 25, 2011; final manuscript received September 20, 2012; published online October 24, 2012. Assoc. Editor: Robert Palumbo.

J. Sol. Energy Eng 135(2), 024501 (Oct 24, 2012) (5 pages) Paper No: SOL-11-1255; doi: 10.1115/1.4007770 History: Received November 25, 2011; Revised September 20, 2012

Closed cycle ocean thermal energy conversion (CC-OTEC) is a way to generate electricity by the sea water temperature difference from the upper surface to the different depth. This paper presents the performance of a 15 kW micropower CC-OTEC system under different working fluids. The results show that both butane and isobutane are not proper working fluids for the CC-OTEC system because the inlet stable operating turbine pressure is in a very narrow range. R125, R143a, and R32, especially R125, are suggested to be the transitional working fluids for CC-OTEC system for their better comprehensive system performance. Moreover, it is recommended that propane should be a candidate for the working fluid because of its excellent comprehensive properties and environmental friendliness. However, propane has inflammable and explosive characteristics. As for the natural working fluid ammonia, almost all performance properties are not satisfactory except the higher net output per unit sea water mass flow rate. But ammonia has relative broader range of the stable operating turbine inlet pressure, which has benefits for the practical plant operation.

FIGURES IN THIS ARTICLE
<>
Copyright © 2013 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Fig. 1

Schematic diagram of the CC-OTEC

Grahic Jump Location
Fig. 2

Cycle efficiency—turbine inlet pressures for different working fluids

Grahic Jump Location
Fig. 3

Cycle net output work—turbine inlet pressures for different working fluids

Grahic Jump Location
Fig. 4

Working fluid pump work—inlet turbine pressures different working fluids

Grahic Jump Location
Fig. 5

Working fluids mass flow rate—the inlet turbine for different working fluids

Grahic Jump Location
Fig. 6

Net work per mass working fluid—turbine inlet pressures for different working fluids

Grahic Jump Location
Fig. 7

Warm sea water pump work—inlet turbine pressures for different working fluids

Grahic Jump Location
Fig. 8

Cold sea water pump work—inlet turbine pressures for different working fluids

Grahic Jump Location
Fig. 9

Overall heat exchanger area per net output work—inlet turbine pressure for different working fluids

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In