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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

Abdel-Salam, M. R. H. , Fauchoux, M. , Ge, G. , Besant, R. W. , and Simonson, C. J. , 2014, “ Expected Energy and Economic Benefits, and Environmental Impacts for Liquid-to-Air Membrane Energy Exchangers (LAMEEs) in HVAC Systems: A Review,” Appl. Energy, 127, pp. 202–218. [CrossRef]
Ge, G. , Abdel-Salam, M. R. H. , Besant, R. W. , and Simonson, C. J. , 2013, “ Research and Applications of Liquid-to-Air Membrane Energy Exchangers in Building HVAC Systems at University of Saskatchewan: A Review,” Renewable Sustainable Energy Rev., 26, pp. 464–479. [CrossRef]
Bergero, S. , and Chiari, A. , 2011, “ On the Performances of a Hybrid Air-Conditioning System in Different Climatic Conditions,” Energy, 36(8), pp. 5261–5273. [CrossRef]
Abdel-Salam, A. H. , and Simonson, C. J. , 2014, “ Annual Evaluation of Energy, Environmental and Economic Performances of a Membrane Liquid Desiccant Air Conditioning System With/Without ERV,” Appl. Energy, 116, pp. 134–148. [CrossRef]
Bergero, S. , and Chiari, A. , 2001, “ Experimental and Theoretical Analysis of Air Humidification/Dehumidification Processes Using Hydrophobic Capillary Contactors,” Appl. Therm. Eng., 21(11), pp. 1119–1135. [CrossRef]
Abdel-Salam, M. R. H. , Ge, G. , Fauchoux, M. , Besant, R. W. , and Simonson, C. J. , 2014, “ State-of-the-Art in Liquid-to-Air Membrane Energy Exchangers (LAMEEs): A Comprehensive Review,” Renewable Sustainable Energy Rev., 39, pp. 700–728. [CrossRef]
Abdel-Salam, M. R. H. , Besant, R. W. , and Simonson, C. J. , 2015, “ Sensitivity of the Performance of a Flat-Plate Liquid-to-Air Membrane Energy Exchanger (LAMEE) to the Air and Solution Channel Widths and Flow Maldistribution,” Int. J. Heat Mass Transfer, 84, pp. 1082–1100. [CrossRef]
Huang, S. M. , and Zhang, L. Z. , 2013, “ Researches and Trends in Membrane-Based Liquid Desiccant Air Dehumidification,” Renewable Sustainable Energy Rev., 28, pp. 425–440. [CrossRef]
Abdel-Salam, M. R. H. , Besant, R. W. , and Simonson, C. J. , 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. [CrossRef]
Abdel-Salam, M. R. H. , Besant, R. W. , and Simonson, C. J. , 2016, “ Performance Testing of a Novel 3-Fluid Liquid-to-Air Membrane Energy Exchanger (3-Fluid LAMEE) Under Desiccant Solution Regeneration Operating Conditions,” Int. J. Heat Mass Transfer, 95, pp. 773–786. [CrossRef]
Shrivastava, D. , and Ameel, T. A. , 2004, “ Three-Fluid Heat Exchangers With Three Thermal Communications. Part B: Effectiveness Evaluation,” Int. J. Heat Mass Transfer, 47(17–18), pp. 3867–3875. [CrossRef]
Abdel-Salam, M. R. H. , Besant, R. W. , and Simonson, C. J. , 2016, “ Experimental Study of Effects of Phase Change Energy and Operating Parameters on Performances of Two-Fluid and Three-Fluid Liquid-to-Air Membrane Energy Exchangers,” ASHRAE Trans., 122(1), pp. 134–145.
Abdel-Salam, M. R. H. , Besant, R. W. , and Simonson, C. J. , 2016, “ Performance Testing of 2-Fluid and 3-Fluid Liquid-to-Air Membrane Energy Exchangers for HVAC Applications in Cold–Dry Climates,” Int. J. Heat Mass Transfer (in press).
Vali, A. , 2009, “ Modeling a Run-Around Heat and Moisture Exchanger Using Two Counter/Cross Flow Exchangers,” M.Sc. thesis, Department of Mechanical Engineering, University of Saskatchewan, Saskatoon, SK, Canada.
eFunda, 2016, “ Thermal Conductivity: Titanium,” eFunda, Sunnyvale, CA, accessed June 8, 2014, http://www.efunda.com/materials/elements/TC_Table.cfm?Element_ID=Ti
Hemingson, H. B. , Simonson, C. J. , and Besant, R. W. , 2011, “ Steady-State Performance of a Run-Around Membrane Energy Exchanger (RAMEE) for a Range of Outdoor Air Conditions,” Int. J. Heat Mass Transfer, 54(9–10), pp. 1814–1824. [CrossRef]

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. 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. 2

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

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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