| 摘要 |
PROBLEM TO BE SOLVED: To improve accuracy of water flow detection in a hot water circulation passage, and to accurately carry out condition grasping in the hot water circulation passage in a hot water circulation system. SOLUTION: By providing an ultrasonic flow velocity meter 6 in the hot water circulation passage, calculating a circulation flow rate in the hot water circulation passage and a sound velocity in the hot water circulation passage from a measured amount from the ultrasonic flow velocity meter 6 by a control means 12, and carrying out various types of operation control based on the calculated circulation flow rate and sound velocity, the water flow detection in the hot water circulation passage and the condition grasping in the hot water circulation passage can be carried out accurately. COPYRIGHT: (C)2007,JPO&INPIT
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