FIELD: engines and pumps.
SUBSTANCE: pump unit (2) has an electric drive motor (6) and a control device (10) integrated in the unit (2). In the pump unit (2) there is at least one internal temperature sensor (16) that senses the temperature of the medium pumped by the unit (2) and supplies the corresponding temperature signal to the control device (10). The control device (10) is configured so as to approximately determine the temperature of the liquid in the fluid reservoir connected to the pump unit (2) based on the sensor temperature signal (16) through the heating circuit. The device (10) is integrated in the pump unit (2). When the engine (6) is stopped on the basis of the temperature signal supplied by the sensor (16) earlier in the operation of the engine (6), during a further change in time it approximately determines the temperature of the liquid in the tank connected to the unit (2) through the heating circuit.
EFFECT: improved design of the solar plant with a pump unit due to simplified installation and reduced susceptibility to malfunctions during operation.
13 cl, 4 dwg
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