Browse > Article

Analysis of Heat Transfer and Drying Characteristics in the Dryer Using the Refraction of Radiation  

Lee Kong-Hoon (Energy Systems Research Center, Korea Institute of Machinery and Materials)
Hong Yong-Ju (Energy Systems Research Center, Korea Institute of Machinery and Materials)
Kim Ook-Joong (Energy Systems Research Center, Korea Institute of Machinery and Materials)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.18, no.8, 2006 , pp. 678-685 More about this Journal
Abstract
Analysis of drying characteristics has been carried out with one-dimensional model in the dryer using the principle of the refraction of radiation. The dryer is composed of hot water tank, plastic film conveyer belt, drying material, etc. The model considers the con-duction and radiation within the plastic film and drying material. The film is semitransparent to radiation and the drying material is assumed to be semitransparent or opaque to radiation. The results show that the effect of radiative transfer on the drying rate is relatively large when the thickness of drying material is small and the water temperature is high. When the material is thin, the drying rate due to conduction is also enhanced and the drying time can considerably be reduced.
Keywords
Drying material; Film thickness; Hot water; Radiative transfer; Refraction;
Citations & Related Records
연도 인용수 순위
  • Reference
1 http://www.dupontteijinfilms.com/cntProductsMylarDatashts.html
2 Parsons, R. A., ed., 1997, ASHRAE Handbook: 1997 Fundamentals, SI ed., ASHRAE, Atlanta
3 Lee, K. H., Choi, B. and Hong, Y.- J., 2006, Analysis of drying characteristics in the dryer using the refraction of radiation, Proc. of SAREK 2006 Summer Annual Conf., pp. 1191-1196
4 Choi, B., Lee, K. H. and Kim, M. B., 2005, Drying characteristics of a refractance window dryer, Proc. of the SAREK 2005 Summer Annual Conf., pp. 1113-1118
5 Abonyi, B. I., Feng, H., Tang, J., Edwards, C. G., Chew, B. P., Mattinson, D. S. and Fellman, J. K., 2001, Quality retention in strawberry and carrot purees dried with refractance window system, Journal of Food Science, Vol. 67, No.3, pp. 1051 -1056   DOI   ScienceOn
6 Hale, G. M. and Querry, M. R., 1973, Optical constants of water in the 200 nm to 200 $\mu$m wavelength region, Applied Optics, Vol. 12, pp, 555-563   DOI
7 Lee, K. H. and Viskanta, R., 1999, Comparison of the diffusion approximation and the discrete ordinates method for heat transfer in glass, Glastechnische Berichte, Vol. 72, pp. 254-265
8 Modest, F. M., 1993, Radiative Heat Transfer, McGraw-Hill, New York