Abstract
ABSTRACT A portable polystyrene-pellet insulation system was developed and shown to reduce night thermal con-ductivity of a greenhouse by over 90 percent. Pellets were pneumatically conveyed daily to and from a double-plastic glazed greenhouse. Static electric attraction bet-ween pellets and plastic sheeting was controlled chemically. Monthly and annual heat use for a double-plastic greenhouse and curtain-insulated double-plastic greenhouse was compared to a pellet-insulated greenhouse using a computer model. The model predicted an annual energy saving of 33 percent for the curtain system, and 70 percent for the pellet system under the selected greenhouse operating conditions.
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