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Steam condensing: liquid CO2 boiling heat transfer in a steam condenser for a new heat recovery system.

Author(s) : NIKITIN K., KATO Y., ISHIZUKA T.

Type of article: Article

Summary

In a new waste heat recovery system, waste heat is recovered from steam condensers through cooling by liquid CO2 instead of seawater, taking advantage of effective boiling heat transfer performance; the heat is subsequently used for local heat supply. The steam condensing - liquid CO2 boiling heat transfer performance in a steam condenser with a shell and a helical coil non-fin tube was studied both numerically and experimentally. A heat transfer numerical model was constructed from two models developed for steam condensation and for liquid CO2 boiling. Experiments were performed to verify the model at a steam pressure range of 3.2-5 kPa and a CO2 saturation pressure range of 5-6 MPa. Overall heat transfer coefficients obtained from the numerical model agree with the experimental data within plus or minus 5%. The numerical estimations show that the boiling local heat transfer coefficient reaches a maximum value of 26 kW/m2.K. This value is almost one order higher than that of a conventional water-cooled condenser. [Reprinted with permission from Elsevier. Copyright, 2008].

Details

  • Original title: Steam condensing: liquid CO2 boiling heat transfer in a steam condenser for a new heat recovery system.
  • Record ID : 2009-0542
  • Languages: English
  • Source: International Journal of Heat and Mass Transfer - vol. 51 - n. 17-18
  • Publication date: 2008/08

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