Document Detail

Food dehydration by solar energy.
MedLine Citation:
PMID:  7047079     Owner:  NLM     Status:  MEDLINE    
Solar driers that are currently being investigated for drying of agricultural products can be divided into two major divisions, depending upon how they transfer the incident solar energy to the product to be dried. These two divisions are direct and indirect drying, with some work also being done on combination drying procedures. In direct solar driers, the product to be dried is usually either inside a tent, greenhouse, or a glass-topped box, where the product to be dried is heated by the direct rays from the sun and the moist air is removed by ambient wind movement. These dryers do accelerate moisture loss rate and the product is usually safe from inclement weather. These dryers usually do not require fans for forced air circulation. With indirect drying, the opposite is true, where most require powered fans for forced air circulation. With this type of dryer, both flatplate and inflated tube solar heat absorbers are used, with each offering certain advantages. Also, combination dryers have been built that utilize both direct and indirect principles. Product evaluation of solar dried foods indicate that in most cases the physical properties, flavor, and vitamin A and C retention were as good as, or better than, conventional dried foods. The economics of the solar systems indicate that most drying procedures are economically feasible for use in small-scale operations only, with the exception of grain drying.
H R Bolin; D K Salunkhe
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Publication Detail:
Type:  Journal Article; Review    
Journal Detail:
Title:  Critical reviews in food science and nutrition     Volume:  16     ISSN:  1040-8398     ISO Abbreviation:  Crit Rev Food Sci Nutr     Publication Date:  1982  
Date Detail:
Created Date:  1982-09-10     Completed Date:  1982-09-10     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  8914818     Medline TA:  Crit Rev Food Sci Nutr     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  327-54     Citation Subset:  IM    
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MeSH Terms
Desiccation / methods*
Energy-Generating Resources* / economics
Food Preservation / economics,  instrumentation,  methods*,  standards
Food-Processing Industry
Fruit / standards
Hot Temperature
Solar Energy* / economics
Time Factors

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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