ENERGY EFFICIENT SUB-TROPICAL GREENHOUSES WITH CARBON DIOXIDE ENRICHMENT

A system for greenhouse temperature control to make carbon dioxide enrichment of greenhouse atmospheres in sub-tropical climates practical is proposed. The system which incorporates a rockpile thermal energy storage for both cooling and heating the greenhouse is expected to result in a reduction in greenhouse area and energy input required for the production of a given quantity of greenhouse crops. Design concepts and predicted performance of the system for an experimental greenhouse are presented.