Condensation du NH3 / H2O avec des concentrations massiques entre 80% et 96%: étude expérimentale dans un échangeur de chaleur à plaque

Translated title of the contribution: Condensation of NH3/H2O with mass concentrations of 80%-96%: Experimental study in a plate heat exchanger

Xuan Tao*, Yunwei Shen, Bo Wang, C.A. Infante Ferreira

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)
57 Downloads (Pure)

Abstract

High concentration NH3/H2O is suitable for Kalina cycles used for the recovery of low grade heat. Plate heat exchangers (PHEs) are compact and reduce the charge of working fluid. This paper investigates the condensation of NH3/H2O with NH3 mass concentrations of 80%-96%. The vapor and liquid concentrations are close to equilibrium state, which are different from normal absorbers. The apparent heat transfer coefficients (HTCs) and frictional pressure drop are presented, covering the mass fluxes of 32–86 kgm−2s−1, the averaged vapor qualities of 0.08–0.65 and the saturated pressure of 610 to 780 kPa. Larger mass fluxes noticeably increase the apparent HTCs and frictional pressure drop. At the mass concentrations of 96%, 91% and 88%, higher vapor qualities increase the apparent HTCs for large mass fluxes. The apparent HTCs decrease slightly with vapor qualities for 80% mass concentration. The experimental results are compared with those of pure NH3. The flow patterns of high concentration NH3/H2O are considered as full film flow and partial film flow, which are the same as for NH3. The mass transfer resistance deteriorates the heat transfer especially for partial film flow, which happens at small liquid mass fluxes. The mass transfer resistance has negligible influences on frictional pressure drop.

Translated title of the contributionCondensation of NH3/H2O with mass concentrations of 80%-96%: Experimental study in a plate heat exchanger
Original languageFrench
Pages (from-to)253-266
JournalInternational Journal of Refrigeration
Volume151
DOIs
Publication statusPublished - 2023

Bibliographical note

Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care
Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Keywords

  • Absorption
  • Condensation heat transfer
  • Experimental investigation
  • NH /HO
  • Plate heat exchanger
  • Two-phase frictional pressure drop

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