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UBC Theses and Dissertations

Energy saving through integrated greenhouse climate control for heating, ventilation and carbon dioxide enrichment Lee, Dal-Hoon


A computer model was developed for predicting heating, ventilation and CO 2 enrichment requirements for a standard tomato greenhouse range located in the Fraser valley of British Columbia. Predicted and measured data were compared for typical cases of outside weather conditions. The mathematical model which is comprised of heat and mass balances for the greenhouse thermal environment and crop photosynthesis has yielded reasonably accurate simulation results compared to observed values. Heating requirement was predicted to within 10-14% for three typical cases of weather conditions, but deviated by 35% from actual energy consumption data under one situation(Case #3). Predicted ventilation demand also followed closely the trend of observed vent openings data, except for Case #4 . Energy saving is achieved in different manners for the four cases.

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