ISHS Acta Horticulturae 761: XXVII International Horticultural Congress - IHC2006: International Symposium on Advances in Environmental Control, Automation and Cultivation Systems for Sustainable, High-Quality Crop Production under Protected Cultivation
EFFECT OF NEWLY DEVELOPED FAN AND MIST EVAPORATIVE COOLING SYSTEM ON GREENHOUSE COOLING AND GROWTH OF CUCUMBER |
| Authors: | Y.I. Nam, I.H. Yu, T.Y. Kim, M.Y. Roh, M.W. Cho |
| Keywords: | cucumber, evaporative cooling system, greenhouse |
| Abstract:
This study was conducted in 2004 to develop a more effective and inexpensive cooling system. The developed cooling system was installed at both sidewalls of a double-span greenhouse. This system had a spray chamber, which was 48 m long, 0.3 m wide and 1.8 m high. A spray chamber was divided into two spaces (0.25 m and 0.05 m wide, respectively) by a plastic film. A spray pipe with 64 nozzles was installed at the bottom of a spray chamber, with a distance of 0.6 m between the nozzles. The air was sucked through two sidewalls of the greenhouse by eighteen fans, with a distance of 4.8 m between the fans. First, the air flowed in the opposite direction of the current of water sprayed by the nozzles and then was diverted upwards over a water drainage basin at the bottom of a spray chamber and finally flowed into the greenhouse through a lots of holes of 5 cm in diameter at the upper parts of a plastic film. The water drained through basin was collected in the tank buried in the ground outside the greenhouse and was continuously supplied to the spray chamber by the pump. The environments (air temperature and relative humidity) in the greenhouse installed with developed cooling system were compared to those in the naturally ventilated greenhouse. The results showed that air temperature in the greenhouse with developed cooling system was about 5~7°C lower than that of the naturally ventilated greenhouse. Marketable yield of cucumber in the cooled greenhouse increased by 26% compared with that in the naturally ventilated greenhouse. | |
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