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air flow design air handler bins capital investment cost cents cents/bu cents/kWh cfm/bu cfm/ft2 of surface collector surface conventional dryers corn drying experiment cost item cost of dryer cost of electrical cost of equipment cost per bushel cost per square dried Drying Performance duplicates electrical hookup $400 electricity per bushel estimated feasibility of solar fiberglass floor area foot of collector fossil fuels grain dryers grain drying systems inflated tube Interest on investment kWh of electricity kWh/bu per percentage l0-percent salvage value lector located moisture removed natural gas original cost percentage point Performance The storage point of moisture polyester film ratio of collector repairs and maintenance rH H rH rH rock heat-storage shelled corn w.b. solar drying systems solar energy solar grain drying Solar System square foot supplemental heat surface area suspended plate System Design total fixed cost transition duct tricity