| 摘要 |
PROBLEM TO BE SOLVED: To precisely judge the finish timing of cleaning by grasping the soil eliminated state of a heat exchanger that is, the recovery state of a heat exchange performance automatically and in real time while cleaning the heat exchanger. SOLUTION: A device for measuring a U value of the heat exchanger is constructed temporarily when the heat exchanger is cleaned. The recovery state of the heat exchange performance of the heat exchanger is grasped by measuring the change of the U value of the heat exchanger in cleaning with time. The finish judgment of the cleaning is performed based on the result. A thermocouple 40 is provided at every nozzle 5a, 5b, 13a, 13b of the heat exchanger. An ultrasonic flowmeter 41 is provided at a cleaning circulation line 30. The U value is calculated by processing the temperatures and the flow rate data at a U value measuring device 50. COPYRIGHT: (C)2004,JPO
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