| 摘要 |
PROBLEM TO BE SOLVED: To provide an underfloor ventilation system which enables the reduction of a running cost while a stable ventilation operation can be maintained. SOLUTION: An underfloor ventilation system has a solar cell 2 which is a power supply for a ventilation operation, a commercial power supply 1 which is an auxiliary power supply, a power supply relay switch 4, a control unit 7 and a ventilation fan motor 8. When the ventilation fan motor 8 is started and when the output of the solar cell 2 is insufficient, the control unit 7 controls the power supply relay switch 4 to close the commercial power supply 1, and in a normal ventilation operation, the solar cell 2 is used as the power supply. With such a constitution, a running cost can be reduced, while the stable ventilation operation is maintained. |
