The present disclosure describes a heat exchanger capable of stably controlling the temperature of the heated fluid.The heat exchanger comprises a main body container, a supply section, a level adjusting section, a heat transfer tube, a pressure measuring section, a temperature measuring section, a level measuring section, and a control section.Control sectionBased on the output of the thermometerSetting the target pressure, which is the target value of pressure within the body vessel, andThe pressure measured by the pressure measuring part approaches the target pressureControlling the supplyBased on the comparison of the output of the temperature measurement part with the predetermined thresholdSetting the target level as the target level of the level of liquid level in the main body containerSo that the level of liquid level measured by the level measurement section approaches the target levelControlling the level regulatorWhen the level regulator is controlled to change the level of the liquid level in the main bodyIt is so arranged that the change of the target level is inhibited until the predetermined time elapses.Diagram
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