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Cross Flow Indirect Evaporative Cooler Made of a Plastic Film/Paper Composite

플라스틱 필름/종이 복합 재질의 직교류 간접증발소자

  • Kim, Nae-Hyun (Dept. of Mechanical Engineering, Incheon Nat'l Univ.)
  • Received : 2016.08.15
  • Accepted : 2016.10.16
  • Published : 2017.01.01

Abstract

Indirect evaporative cooling, which utilizes a cooling effect obtained by the evaporation of water, is energy-effective compared to the conventional vapor compression method. It is also eco-friendly, due to the non-usage of CFC refrigerant. In this study, three indirect evaporative cooler samples of the cross flow type(size: $300mm{\times}300mm{\times}300mm$, channel pitch: $5mm{\times}5mm$, $5mm{\times}7mm$, $7mm{\times}7mm$) were made using plastic/paper composites. Tests were conducted to measure indirect evaporative efficiencies and pressure drops. Results showed that the efficiency was the highest for the $5mm{\times}5mm$ sample, owing to the largest surface area. The saved electrical energy was also the greatest for that sample. The pressure drop of the wet channel was larger than that of the dry channel as expected. A theoretical model was proposed, which underestimated both the indirect evaporation efficiency and the pressure drop.

References

  1. Duan, Z., Zhan, C., Zhang, X., Mustafa, M. Zhao, X., Alimohammadisgvand, B. and Hasan, A., 2012, "Indirect Evaporative Cooling: Past, Present and Future Potentials," Renew. Sustain. Energy Rev., Vol. 16, pp. 6823-6850. https://doi.org/10.1016/j.rser.2012.07.007
  2. Jaber, S. and Ajib, S., 2011, "Evaporative Cooling as an Efficient System in Mediterranean Region," Appl. Therm. Eng., Vol. 31, pp. 2590-2596. https://doi.org/10.1016/j.applthermaleng.2011.04.026
  3. Caliskan, H., Dincer, I. and Hepbasil, A., 2012, "Exergoeconomic Enviroecomomic and Sustainability Analyses of a Novel Air Cooler," Energy Build., Vol. 55, pp. 747-756. https://doi.org/10.1016/j.enbuild.2012.03.024
  4. Costello, B. and Finn, D., 2007, "Thermal Effectiveness Characteristics of Low Approach Indirect Evaporative Cooling Systems in Buildings," Energy Build., Vol. 39, pp. 1235-1243. https://doi.org/10.1016/j.enbuild.2007.01.003
  5. Maheshwari, G. P., Al-Ragom, F. and Suri, R. K., 2001, "Energy Saving Potential of an Indirect Evaporative Cooler," Appl. Energy, Vol. 69, pp. 69-76. https://doi.org/10.1016/S0306-2619(00)00066-0
  6. Santamouris, M. and Kolokotsa, D., 2013, "Passive Cooling Dissipation Techniques for Buildings and Other Structures: the State of the Art," Energy Build., Vol. 57, pp. 74-94. https://doi.org/10.1016/j.enbuild.2012.11.002
  7. Watt, J. D. and Brown, W. K., 1997, Evaporative Air Conditioning Handbook, 3rd ed., The Fairmont Press Inc.
  8. Pescod, D., 1979, "A Heat Exchanger for Energy Saving in an Air Conditioning Plant," ASHRAE Trans., Vol. 85., Pt. 2, pp. 238-251.
  9. Maclaine-Cross, I. L. and Banks, P. J., 1981, "A General Theory of Wet Surface Heat Exchangers and Its Application to Regenerative Cooling," J. Heat Transfer, Vol. 103, pp. 578-585.
  10. Kettleborough, C. F. and Hsieh, C. S., 1983, "The Thermal Performance of the Wet Surface Plastic Plate Heat Exchanger Used in an Indirect Evaporative Cooler," J. Heat Transfer, Vol. 105, pp. 366-373. https://doi.org/10.1115/1.3245587
  11. Tejero-Gonzalez, A., Andres-Chicote, M., Velasco - Gomez, E. and Rey-Martinez, F. J., 2013, "Influence of Constructive Parameters on the Performance of Two Indirect Evaporative Cooler Prototypes," Appl. Therm. Eng., Vol, 51, pp. 1017-1025. https://doi.org/10.1016/j.applthermaleng.2012.10.054
  12. Parker, R. O. and Treybal, R. E., 1962, "The Heat Mass Transfer Characteristics of Evaporative Coolers," Chem. Eng. Prog. Symp. Ser. Vol 57, No. 32, pp. 138-149.
  13. Hasan, A. and Siren, K., 2003, "Performance Investigation of Plain and Finned Tube Evaporatively Cooled Heat Exchangers," Appl. Therm. Eng., Vol. 23, No. 3, pp. 325-340. https://doi.org/10.1016/S1359-4311(02)00194-1
  14. Zalewski, W. and Gryglaszewski, P. A., 1977, "Mathematical Model of Heat and Mass Transfer Processes in Evaporative Coolers," Chem. Eng. Process, Vol. 36, No. 4, pp. 271-280. https://doi.org/10.1016/S0255-2701(97)00006-8
  15. Ren, C. and Yang, H., 2006, "An Analytical Model for the Heat and Mass Transfer Processes in Indirect Evaporative Cooling with Parallel/Counter Flow Configurations," Int. J. Heat Mass Transfer, Vol. 49, pp. 617-627. https://doi.org/10.1016/j.ijheatmasstransfer.2005.08.019
  16. Hasan, A., 2012, "Going Below the Wet-Bulb Temperature by Indirect Evaporative Cooling: Analysis Using a Modified $\varepsilon$-NTU Method," Appl. Energy, Vol. 89, pp. 237-245. https://doi.org/10.1016/j.apenergy.2011.07.005
  17. Cui, X., Chua, K. J., Islam, M. R. and Yang, W. M., 2014, "Fundamental Formulation of a Modified LMTD Method to Study Indirect Evaporative Heat Exchangers," Energy Conservation Management, Vol. 88, pp. 372-381. https://doi.org/10.1016/j.enconman.2014.08.056
  18. Chen, Y., Yang, H. and Luo, Y., 2016, "Indirect Evaporative Cooler Considering Condensation from Primary Air; Model Development and Parameter Analysis," Build. Env., Vol. 95, pp. 330-345. https://doi.org/10.1016/j.buildenv.2015.09.030
  19. Riangvilaikul, B. and Kumar, S., 2010, "An Experimental Study of a Novel Dew Point Evaporative Cooling System," Energy Build., Vol. 42, pp. 637-644. https://doi.org/10.1016/j.enbuild.2009.10.034
  20. Zhao, X., Liu, S. and Riffat, S. B., 2008, "Comparative Study of Heat and Mass Exchanging Materials for Indirect Evaporative Cooling Systems," Build. Environ., Vol. 43, No. 11, pp. 1902-1911. https://doi.org/10.1016/j.buildenv.2007.11.009
  21. KS M 896, 2013, Paper and Plate - Measurement of Water Absorption Rate in Water.
  22. ASHRAE Standard 41.1, 1986, Standard Method for Temperature Measurement, ASHRAE.
  23. ASHRAE Standard 41.2, Standard Method for Laboratory Air-Flow Measurement, ASHRAE.
  24. KS C 9306, 2010, Air Conditioner, Korean Standard Association.
  25. Kim, N.-H., 2016, "Heat and Moisture Transfer in a Counter Flow Regenerative Evaporative Cooler Made of Plastic Film/Paper Composite," J. Mech Sci. Tech., Vo. 30, pp. 1449-1457. https://doi.org/10.1007/s12206-016-0253-z
  26. ASHRAE Standard 143, 2007, Method of Test for Rating Indirect Evaporative Coolers, ASHRAE.
  27. Klein, S. J. and McClintock, F. A., 1953, "The Description of Uncertainties in a Single Sample Experiments," Mech. Eng. Vol. 75, pp. 3-9.
  28. Mills, A. F., 1995, Basic Heat and Mass Transfer, Irwin Pub.
  29. Shah, R. K. and London, A. L., 1978, Laminar Flow Forced Convection in a Duct, Academic Pub.
  30. Johnson, J. E., 1997, Heat and Mass Transfer Between Two Fluid Streams Separated by a Thin, Permeable Barrier, Ph.D. Thesis, University of Minnesota, Department of Mechanical Eng.
  31. Kays, W. M. and London, A. L., 1984, Compact Heat Exchangers, McGraw-Hill Pub..
  32. Personal communication with Samhwa Ace Co., 2016.