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Description: In climates where winter night-time temperatures drop well below freezing point, condensation in greenhouses is observed, usually in the first few hours after nightfall. A high latent heat of condensation and relatively high rates of heat transfer combine to make condensation an efficient means of heat transfer. Certainly, early in the night, condensation should provide an important contribution to greenhouse heat losses. Condensation in greenhouses is generally viewed by operators in terms of problems of plant health and discomfort to greenhouse workers and not in energy-economic terms. This is understandable, as capital charges and labor costs constitute the major cost of greenhouse operation. However, the fuel cost component has more than tripled since 1973. Fuel costs are expected to continue rising so that investigating means of reducing greenhouse energy requirements is timely. Thus, the purpose of this study is to assess the magnitude of condensation heat loss in greenhouses, in cold weather, and, if significant, to investigate means and costs of humidity control. In order to cover a variety of situations, heat loss calculations are carried out on a single-glazed glasshouse, and on a double-layer plastic film greenhouse of identical dimensions.

Keywords: energy conservation through control of greenhouse humidity. i. condensation heat losses
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Citation: Silveston, P. L., Costigane, W. D., Tiessen, H. and R. R. Hudgins 1980. ENERGY CONSERVATION THROUGH CONTROL OF GREENHOUSE HUMIDITY. I. CONDENSATION HEAT LOSSES. Canadian Agricultural Engineering 22(2):125-132.
Volume: 22
Issue: 2
Pages 125 - 132
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Date: 1980
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Publication type: Journal
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Coverage: Canada
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