Abstract
The effects of condensate on the transmittance of a vertical standard polyethylene film and a vertical standard glass plate were investigated to verify whether condensate on a greenhouse cladding material could increase the transmittance at high angles of incidence as predicted in literature. At an incidence angle of 80°, a mean transmittance increase of about 4% was measured when condensate was present on the polyethylene film. On the glass plate, however, a transmittance decrease of about 5% was measured under similar circumstances. Therefore, it was concluded that the transmittance loss or gain due to condensate at high incidence angles depended on the wettability of the cladding material.
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