Calculation device, calculation method, and program

A calculation apparatus comprising:

• a first acquisition unit configured to acquire, based on a change in a temperature of a temperature controlled member with respect to a change in an outside temperature measured for a plurality of temperatures of a temperature controlling member, a first approximation expression representing a relationship between the outside temperature and the temperature of the temperature controlled member at each of the plurality of temperatures of the temperature controlling member;
• a second acquisition unit configured to acquire, based on the first approximation expression, a second approximation expression representing a change in one or more coefficients with respect to each of the plurality of temperatures of the temperature controlling member;
• a temperature input unit configured to receive input of a first set temperature of the temperature controlled member and a second set temperature of the temperature controlling member;
• a generation unit configured to substitute the second set temperature into the second approximation expression to generate a third approximation expression representing a relationship between the outside temperature and the temperature of the temperature controlled member;
• and
• a calculation/output unit configured to substitute the first set temperature into the third approximation expression to calculate an outside temperature to be set.