Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
권호 표지

Air Handling Unit Utilizing Water/Air Direct Contact Heat Exchanger with Mesh

공기조화기내 메쉬삽입 물-공기 직접접촉의 열전달 특성 연구

  • Published : 2008.01.10
Download PDF
⟨ Previous Next ⟩

Abstract

The objective of this research was to investigate the enhancement of heat transfer by mesh in water/air direct contact air conditioning system. Mesh is inserted as a turbulent promoter in front of the water injection nozzle. The heat transfer characteristics with and without mesh and the effect of the number of inserted mesh and mesh porosity size have been studied experimentally. Inserted mesh improves heat transfer efficiency compared to non~inserted mesh system and heat transfer efficiency increased as the number of mesh is increased. Meanwhile, heat transfer efficiency decreased as the porosity of the mesh is increased. With inserted mesh, inlet and outlet temperature difference of air increased more than 50%. Heat exchange time of water/air to reach the 100% humidity decreased less than 30%. This result shows inserted mesh can enhance the performance of the water/air direct contact air conditioning system.

Keywords

References

  1. Tadris, L., Shehu Diso, I., Santini, R. and Pantaloni, J., 1987, Vaporization of a liquid by direct contact in another immiscible liquid, Int. J. Heat Mass Transfer, Vol. 30, No. 9, pp. 1773-1785 https://doi.org/10.1016/0017-9310(87)90237-7
  2. Jacobs, H. R., 1988, Direct-contact heat tranfer for process technologies, J. Heat Transfer, Vol. 110, pp. 1259-1270 https://doi.org/10.1115/1.3250625
  3. Bohn, M. S., 1985, Air molten salt direct contact heat exchange, Trans. of the ASME, J. of Solar Energy Engineering, Vol. 107, pp. 208-214 https://doi.org/10.1115/1.3267680
  4. Song, M., Steiff, A. and Weinspach, P. M., 1998, Direct-contact heat tranfer with change of phase : A population balance model, Proc., 11th Int. Heat Tranfer Conf., Kyungju, Vol. 6, pp. 457-462
  5. Kang, Y. H., Kim, N. J. and Kim, C. B., 2000, A numerical study on heat tranfer characteristics in a spray column direct cintact heat exchanger, Korean J. of Air-conditioning and Refrigeration Engineering, Vol. 12, No. 8, pp. 735-744