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A model experiment on reduction of greenhouse cooling load in the daytime using shading material against infrared radiation as covering material

, : A model experiment on reduction of greenhouse cooling load in the daytime using shading material against infrared radiation as covering material. Environment Control in Biology 35(1): 15-20

To prevent high temperature or to reduce the cooling load in greenhouses in the daytime during a high temperature period has been one of the most important problems to be solved for protected horticulture, especially in Japan. Therefore the authors have worked at the development of an effective shading material against infrared radiation (or thermal rays) which doesn't contribute to photosynthesis. This report examines the effect on the reduction of cooling load in the daytime of a newly-developed covering material, named "Filter" by the authors. The main results obtained are as follows: 1) Filter cut about 60% of shortwave radiation and 30% of photosynthetic photon flux density (PPFD). 2) When the total shortwave radiation incident on the covering material was 618 W/m-2 and the cooling toad under existing clear glass was about 500 W/m-2 at inside air temperature of 25 degree C, the cooling load under Filter was reduced by 180 W/m-2 in comparison with that under clear glass, and by 50 W/m-2 in comparison with the case of clear glass with 20% shading so as to agree with the value of PPFD under Filter. 3) The effect of cooling the covering material on the reduction of cooling load was remarkable with Filter. The reason is that the temperature of Filter is relatively high and thermal radiation emitted from Filter to the inside is comparatively large, because of absorbing a considerable part of infrared radiation.

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