Articles
DEVELOPMENT OF A PASSIVE SOLAR SYSTEM FOR HEATING GREENHOUSES
Article number
191_26
Pages
245 – 252
Language
Abstract
After many efforts it has been designed and constructed in Agricultural Research Center of Northern Greece a very simple and effective passive solar system for heating of greenhouses.
With this system, the collection of solar energy is achieved through plastics tubes filled with water and laid on the ground between the rows of plants.
Underneath the water tubes a black polyethylene film is laid to collect the solar radiation, and the whole system is on an isolating plastics sheet that decreases the heat losses to the ground.
The same system is used for storage and for distribution of heat in the greenhouses.
From the research data that was collected during 1984–85 it was found that the watertubes filled up must have a diameter of 31,8 cm, be constructed by transparent polyethylene film, cover 35–40% of the area of the greenhouse and contain 80–100 m3 of water per 1000 m2 of greenhouse.
With this system, the collection of solar energy is achieved through plastics tubes filled with water and laid on the ground between the rows of plants.
Underneath the water tubes a black polyethylene film is laid to collect the solar radiation, and the whole system is on an isolating plastics sheet that decreases the heat losses to the ground.
The same system is used for storage and for distribution of heat in the greenhouses.
From the research data that was collected during 1984–85 it was found that the watertubes filled up must have a diameter of 31,8 cm, be constructed by transparent polyethylene film, cover 35–40% of the area of the greenhouse and contain 80–100 m3 of water per 1000 m2 of greenhouse.
Authors
M. Grafiadellis
Keywords
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