| 摘要 |
PROBLEM TO BE SOLVED: To provide an ultrasonic flowmeter capable of measuring the flow velocity and/or quantity of flow of a plurality of liquids of different temperatures in an installation space more compact than before and to provide a hot water supply system. SOLUTION: The ultrasonic flowmeter 10 is provided with a first measuring part provided for a first channel through which a liquid flows; a second measuring part provided for a second channel through which a liquid different from the liquid flowing through the first channel flows; a pair of ultrasonic transmitter/receivers, each being provided for the first measuring part and for the second measuring part and separately arranged on the upstream side and on the downstream side of the channels for transmitting and receiving ultrasonic waves in both directions of the forward direction along the flow of the liquids and the backward direction opposite to that of the flow; an operation part for computing the difference in the arrival times of ultrasonic waves in the forward direction and the backward direction between the pair of ultrasonic transmitter/receivers; and a switching means for alternately switching between the first measuring part and the second measuring part to connect to the operation part. Since it is possible to compute both measurement values (the velocity and quantity of flow and temperatures) on water at ordinary temperatures and measurement values on heated water formed by heating the water at normal temperatures in a common single arithmetic processing part 18 by the ultrasonic flowmeter 10, the size of the ultrasonic flowmeter 10 can be made smaller than that of a simple combination of two conventional vane-wheel type flowmeters and suppress its installation space smaller than before. COPYRIGHT: (C)2005,JPO&NCIPI
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