Abstract
In this study, air cooling in the zone only around plants in greenhouse in the daytime in summer was investigated.
Two types of air cooling systems were constructed in a greenhouse in Ehime University. One was the system which used cold water and water-air heat exchanger (cold water cooling system), and the other was the system which utilized heat of vaporization of fog (fog cooling system). Schematic diagrams of these systems are shown in Fig. 1 and Fig. 2.
The results of air cooling on a fine day are shown in Fig. 4, Fig. 5 and Fig. 6. Furthermore, Fig. 7 shows the effectiveness of system identification in analysis and control in cold water cooling system.
The effect of environment of above-ground part on occurrence of blossom-end rot of tomato plants was also investigated. The effect of air flow to fruits was also examined using the system shown in Fig. 3. The results are shown in Fig. 8 and Table 1.
