Advertisement

Solar Crop Drying

  • N. K. Bansal
Chapter

Abstract

The developing countries suffer heavy losses of food in the post harvest period during which the harvested crop passes through a series of well defined steps - like threshing (or shelling), drying, storage and final plrocessing (Fig. 1). Drying is one of the most important steps of post harvest handling of the crop. The traditional methods of drying employed in developing countries are open air sun drying or natural drying in shade). Because of little control over the drying rate in these methods, the dried product is very often underdried or overdried. Underdrying results in deterioration of food due to fungi or bacteria whereas overdrying may result in case hardening followed by bursting and spoilage of the food. Under controlled conditions of temperature and humidity, the cropl dries reasonably rapidly to a safe moisture level. Such conditions also ensure superior quality (better nutritional and germination characteristics) in the dried product. Rationale for drying of various types of food products is summarised in Table 1.

Keywords

Solar Collector Chemical Pretreatment Absorber Plate Humidity Ratio Selective Coating 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    W. Eissen, (1983), ‘Trocknung von Trauben mit Solar Energie’, Ph.D. Dissertation, University of Hohnheim, Sttuttgart FRG.Google Scholar
  2. 2.
    K.N. Marshall, et. al., (1975), ‘Thermal Radiation Characteristics of Transparent Plastic Honeycombs for Solar Collector Applications’, ISES 1975, Paper No. 32/1.Google Scholar
  3. 3.
    K.N. Marshall, R.K. Wedel and R.E. Dammann, (1976), “Development of Plastic Honeycomb Flat Plate Solar Collectors”, Lockheed Missiles and Space Company, Inc. Palo Alto Res. Laboratory, Final Rep., Prepared for ERDA, Division of Solar Energy, SAN/1081–760.Google Scholar
  4. 4.
    H. Buchberg et. al., (1971), “Performance Characteristic of Rectangular Honeycomb Colar Thermal Collector”, Solar Energy 13, 193–221.CrossRefGoogle Scholar
  5. 5.
    W.W.S. Charters and L.F Peterson, (1972), “Free Convection Suppression using Honeycombs Cellular Materials”, Solar Energy 13(4), 353–362.CrossRefGoogle Scholar
  6. 6.
    H. Buchberg and D.K. Edwards, (1976), “Design Considerations for Solar Collectors with Cylindrical Glass Honeycombs”, Solar Energy 18, 193–283.CrossRefGoogle Scholar
  7. 7.
    S. Satcunathan and S. Deonarina, (1973), “A Two Pass Solar Air Heater”, Solar Energy 15, 41–49.CrossRefGoogle Scholar
  8. 8.
    I.E. Macedo and C.A.C. Altemani, (1978), “Experimental Evaluation of Natural Convection Solar Air Heaters”, Solar Energy 22, 367–369.CrossRefGoogle Scholar
  9. 9.
    Scholhopf, (1983), ‘A Natural Convection Solar Dryer’, Pvt. Communication, University of Munchen, FRG.Google Scholar
  10. 10.
    R.W. Bliss, (1955), “Solar House Heating - A Panel”, Proc. World Symp. April, Solar Energy Phoenix, pp. 151–158.Google Scholar
  11. 11.
    V.C. Khe, (1971), Ph.D. Dissertation, U.C. Davis.Google Scholar
  12. 12.
    J.P. Chiou, M.M. El-Wakil and J.A. Duffie, (1965), ‘Slit and Expanded Aluminium Foil Matrix Solar Collector, Solar Energy, 9(2), 73–80.CrossRefGoogle Scholar
  13. 13.
    K.V. Chau, (1977), “Analysis of a Matrix Solar Collector”, Proc. of 1977 Annual Meeting of the American Section of ISES, Vol. 1, Ed. Beach C. and Fordyce E, p. 211–215.Google Scholar
  14. 14.
    M.J. Schvematur, (1982), ‘Notes on a solar collector with unique air permicible media’, Solar Energy, 3(4), 138–141.Google Scholar
  15. 15.
    J.P. Chiou and M.M. El-Wakil, (1966), “Heat Transfer and Flow Characteristics of Porous Matrices with Radiation as Heat Source”, Trans. ASMS J. of Heat Transfer, Vol. 88(1), No. 1, pp. 69–76.Google Scholar
  16. 16.
    A.F. Whillier, (1963), “Lecture Notes on Solar Energy”, Tech. Rep. T. 63, Brace Res. Instt. of MacGill University Montreal.Google Scholar
  17. 17.
    R.K. Collier, (1979), “The Characterization of Crushed Glass as a Transpired Air Heating Solar Collector Material”, ISES 1979 Proceedings, pp. 264–268.Google Scholar
  18. 18.
    N.K. Bansal and R. Uhlimann, (1984) Development and Testing of Low Cost Solar Energy Collectors for Heating Air, Solar Energy, 33(2), 197–208.CrossRefGoogle Scholar
  19. 19.
    N.K. Bansal and A. Boettcher, (1982), ‘Technoeconomic Qualification of Solar Energy Collectors’, International Sonnenfurum.Google Scholar
  20. 20.
    A.J. Winkler, J.A. Cook, W.M. Kliewer and L.A. Lider, (1974), General Viticulture, University of California Press, Berkley, Los Angeles.Google Scholar

Copyright information

© D. Reidel Publishing Company 1987

Authors and Affiliations

  • N. K. Bansal
    • 1
  1. 1.Centre of Energy StudiesIndian Institute of Technology Hauz KhasNew DelhiIndia

Personalised recommendations