A. Tosun et O. Saygin, CONSTRUCTION OF A SOLAR BOILER-DRYER FOR PROCESSING RESTAURANT FOOD WASTES FOR THEIR USE AS INGREDIENTS IN ANIMAL FEED, Solar energy, 51(1), 1993, pp. 1-6
We examined various methods of solar drying of restaurant leftovers. O
pen air as well as forced air drying gave bacteriologically inadequate
products. We therefore constructed a solar boiler-dryer working at 10
5-degrees-C. To prevent the observed heating to higher temperatures at
the later stages, drying was extended to two days. While sterilizatio
n and removal of most of the water are achieved by boiling in the sola
r boiler-dryer on the first day. open air drying on the second day all
owed us to obtain a light brown, colored product with trace amounts of
bacteria and mold. The energy efficiency for vaporization was 85%. He
at losses of the whole dryer due to reflection, convection, and radiat
ion were calculated to be 13%, 7%, and 20%, respectively. The product
obtained from the mixture over five successive days had a composition
close to recommended values for chicken feed (e.g., broiler).