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Research Papers: Heat and Mass Transfer

Performance Definitions for Three-Fluid Heat and Moisture Exchangers

[+] Author and Article Information
Mohamed R. H. Abdel-Salam

Department of Mechanical Engineering, University of Saskatchewan,
57 Campus Drive,
Saskatoon, SK S7N 5A9, Canada
e-mail: moa030@mail.usask.ca

Robert W. Besant, Carey J. Simonson

Department of Mechanical Engineering,
University of Saskatchewan,
57 Campus Drive,
Saskatoon, SK S7N 5A9, Canada

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received December 24, 2015; final manuscript received September 14, 2016; published online October 26, 2016. Editor: Dr. Portonovo S. Ayyaswamy.

J. Heat Transfer 139(2), 022003 (Oct 26, 2016) (8 pages) Paper No: HT-15-1816; doi: 10.1115/1.4034756 History: Received December 24, 2015; Revised September 14, 2016

This paper presents performance definitions for calculating the overall effectiveness of three-fluid heat and moisture exchangers. The three-fluid heat and moisture exchanger considered in this paper is a combination of a liquid-to-liquid heat exchanger for heat transfer between a desiccant solution and a refrigerant and an energy exchanger for heat and moisture transfer between desiccant solution and air streams. The performance definitions presented in this paper are used to calculate the overall sensible and latent effectivenesses of a three-fluid heat and moisture exchanger, which has been tested under air cooling and dehumidifying operating conditions in a previous work (Abdel-Salam et al., 2016, “Design and Testing of a Novel 3-Fluid Liquid-to-Air Membrane Energy Exchanger (3-Fluid LAMEE),” Int. J. Heat Mass Transfer, 92, pp. 312–329). The effectiveness of this three-fluid heat and moisture exchanger is compared when calculated using the traditional energy exchanger effectiveness equations and the overall performance definitions. Results show that the overall performance definitions provide effectiveness values that are less sensitive to changes in the inlet refrigerant temperature and therefore are more generally applicable for energy exchanger design than the traditional effectiveness equations used in the literature.

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References

Figures

Grahic Jump Location
Fig. 1

Comparison between maximum possible heat and moisture transfer rates in two-fluid and three-fluid energy exchangers under air cooling and dehumidifying operating conditions

Grahic Jump Location
Fig. 2

(a) Schematic and (b) cross-sectional view of the three-fluid LAMEE [9]

Grahic Jump Location
Fig. 3

Comparison between the (a) sensible effectivenesses and (b) latent effectivenesses of the three-fluid LAMEE calculated using the traditional and overall effectiveness equations at several inlet cooling water temperatures

Grahic Jump Location
Fig. 4

Comparison between the (a) sensible effectivenesses and (b) latent effectivenesses of the three-fluid LAMEE calculated using the traditional and overall effectiveness equations at several cooling water mass flow rates

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