| 摘要 |
PCT No. PCT/SE81/00256 Sec. 371 Date May 12, 1982 Sec. 102(e) Date May 12, 1982 PCT Filed Sep. 11, 1981 PCT Pub. No. WO82/01063 PCT Pub. Date Apr. 1, 1982.A figure of effectiveness of a heat exchanger is maintained at a predetermined level, even when one of the input fluid flows varies in an incontrollable manner, without the need for flow meters to detect any flow variations. Temperature sensors are arranged in the respective input and output fluid lines to measure the temperature of the fluids at these points and differential circuits and a comparator form a temperature relation that is compared to a predetermined, desired temperature relation to drive a servo system to control a flow value in the inlet water line, which results in the desired figure of effectiveness for that heat exchanger without measuring the actual fluid flow.
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