ISHS Acta Horticulturae 148: III International Symposium on Energy in Protected Cultivation
STRATEGIES FOR CONTROLLING GREENHOUSE THERMAL SCREENS |
| Authors: | L.S. Marsh, L.D. Albright, R.W. Langhans |
| Abstract:
Four thermal screen operating strategies were experimentally compared. The objective was to find an operating strategy which maximized the differences in plant growth and heating costs. The test crop was lettuce (Lactvea Sativa L. c.v. Grand Rapids). No significant differences in plant growth due to thermal screen operations were observed. Screen operating strategies based on light level required significantly less heat energy (about 3.3% of the potential savings due to the screen) than time clock operation. Adjusting the light level for screen operation as a function of the outside temperature resulted in a heat energy requirement which was not significantly different from operation at a set light level. | |
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