| 摘要 |
PROBLEM TO BE SOLVED: To accurately measure the flow rate of a hot fluid by immersing a measuring part piping in a cooling water and measuring the flow rate or the hot fluid flowing therein. SOLUTION: A cooling tank 1 is filled with a cooling water 11 held at a fixed temp. and a measuring part piping 2 is immersed therein. When in this condition a hot fluid 16 flows in an upstream piping 5, a low temp. fluid 17 results and drains from a downstream piping 6 while the flow rate of the low temp. fluid 17 is measured from the propagation time of an ultrasonic wave emitted between an upstream and downstream sensors 3, 4. After conversion according to the Boyle-Charles' law, the flow rate of the hot fluid 16 is obtained. The hot fluid may be not only exhaust gases but hot airs from heat treating facilities such as blast furnaces or hot fluids exhausted from plastic forming factories.
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