A thermal screen is a moveable internal lining placed between a crop and the greenhouse cover. The usual strategy for the operation of a screen is for it to be expanded or spread out in position above a crop during the night-time – the period of maximum heat loss – and then for it to be folded away during the day. In this way the screen is used to conserve energy within the greenhouse.
In addition to this however, certain screen materials can be used to lower the radiant load on a crop in periods of high solar radiation in summer. If a screen is used for this purpose it is drawn across a crop during the daytime and probably drawn back at night to assist the greenhouse in cooling.
There are three major factors in play – UV, light and heat.

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