Device for controlling temperature of cooling water

A device for controlling a temperature of cooling water, the device comprising:

• a heat exchanger for carrying out heat exchange between primary cooling water and secondary cooling water;
• a tank for storing the secondary cooling water;
• an injection pipe for connecting between the tank and a secondary cooling water supply unit;
• a valve for controlling a flow rate of the secondary cooling water to be supplied into the tank from the secondary cooling water supply unit through the injection pipe;
• a fluid level detection unit for detecting an amount of the secondary cooling water stored in the tank;
• a first circulation pipe for connecting between the tank and a secondary cooling water inlet of the heat exchanger;
• a second circulation pipe for connecting between a secondary cooling water outlet of the heat exchanger and a secondary cooling water inlet of a temperature-control target;
• a third circulation pipe for connecting between the tank and a secondary cooling water outlet of the temperature-control target;
• a pump for circulating the secondary cooling water stored in the tank through the heat exchanger, the temperature-control target, and the tank;
• and
• a controller for opening the valve while operation of the pump is stopped, closing the valve and driving the pump in the case that detection results from the fluid level detection unit indicate an upper limit amount, and stopping the operation of the pump in the case that the detection results from the fluid level detection unit indicate a lower limit amount.