Refrigeration-type chiller

A refrigeration-type chiller comprising:

• a coolant circuit that supplies a temperature-regulated coolant to a load;
• a refrigeration circuit that adjusts a temperature of the coolant through a heat exchange between the coolant and a refrigerant;
• a heat exchanger that exchanges heat between the coolant and the refrigerant;
• and
• a control unit that controls the chiller as a whole,
• wherein
• the coolant circuit includes a tank in which the coolant is stored, a pump that supplies the coolant in the tank to the load, and a temperature sensor that measures the temperature of the coolant, and
• the control unit includes a temperature setting unit that sets an initial set temperature and an adjustment target temperature of the coolant for changing a temperature of the load to a target temperature, a time setting unit that sets an adjustment time for changing the temperature of the coolant from the initial set temperature to the adjustment target temperature, an arithmetic unit that calculates a gradient of temperature change as a target temperature gradient from the initial set temperature, the adjustment target temperature, and the adjustment time, and a temperature control unit that so adjusts a temperature of the refrigerant that is supplied to the heat exchanger that the temperature of the coolant changes in accordance with the target temperature gradient.