Co-Authors:
Teitel, M., Agricultural Engineering Institute, Agricultural Research Organization, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Tanny, J., Ctr. for Technol. Education Holon, P.O. Box 305, Holon 58102, Israel
Abstract:
The effect of the location of heating tubes in a greenhouse on the amount of heat directly radiated from a tube to the canopy is studied. A simple model is presented in which a radiative heating efficiency is defined and calculated for various tube positions and tube surface temperatures. The results show that the best tube position from a radiative point of view is near the crop at its mid-height. It is also shown that at low tube surface temperatures, the radiative heating efficiency increases sharply with the tube surface temperature. © 1998 Silsoe Research Institute.
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