The. University of Arizona ' s work i n c o n t r o l l e d -e n v i r o r n t a g r ic u l t u r e i s reviewed, followed by d i s c u s s i o n s o f t h e i r contemporary modifications of t h e s e techniques in controlled-environment aquacult u r e . Open and closed systems of a g r i c u l t u r e have been designed, constructed and operated by t h e University i n d e s e r t regions of Arabia and North America t o o b t a i n high y i e l d s of s u p e r i o r q u a l i t y crops while g r e a t l y reducing water usage. of innovative and c o s t -e f f i c i e n t c o n s t r u c t i o n techniques and simplif i e d systems t o c o n t r o l temperature and o t h e r enviroxnnental v a r i a b l e s . Similar systems f o r controlled-environment aquaculture a r e discussed, including t h e new University a p p l i c a t i o n s i n shrimp c u l t u r e . Techniques of c o n s t r u c t i o n and o p e r a t i o n a r e reviewed and evaluated, p a r t i c u l a r l y i n r e l a t i o n t o the m j o r problems of maintaining approp r i a t e water q u a l i t y i n confined systems enriched by l a r g e populat i o n s of animals and frequent i n t r o d u c t i o n of a r t i f i c i a l feeds. This required t h e development
Dehydration of fruit in the United States is often done by means of a tunnel dehydrator utilizing large quantities of fossil fuel. Existing dehydrators have been designed to operate with maximum product through-put and with little regard for energy efficiency. Incorporating controlled recirculating air dampers and thermal energy recovery equipment on the exhaust air, calculations and preliminary tests show that the energy required in dehydration may be cut by up to 4 0%. During this work, one tunnel was modified and upgraded in a commercial 24-tunnel facility to demonstrate the potential savings. A primary element of this program, the heat recovery heat exchanger, operated below specifications. The manufacturer, Hughes Aircraft Company, has determined that the heat exchanger design was based on faulty data, and is constructing a second exchanger which can be installed and tested during a subsequent program. n
It hps l^een reproduced f ros the beat available copy to permit the broadest possible avail-' ability. C0 0-2<816'-1 ENERGY CONSERVATION IN FRUIT DEHYDRATORS UTILIZING RECIRCULATION OF EXHAUST AIR
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.