Determination device, determination method, and computer-readable recording medium

A determination device comprising:

• a management server processor, and
• a memory;
• wherein
• the memory is configured to acquire first degradation values that indicate respective degradation degrees of a plurality of components of a same type via an network;
• and
• the management server processor is configured to
• regard the respective first degradation values of the plurality of components as respective first usage values in a plurality of usage environments in which the plurality of components are used,
• store in the memory the first degradation values regarded as the first usage values;
• determine, based on a target value that indicates a predetermined target degradation degree of the plurality of components, first combinations of the respective first degradation values of the plurality of components and the respective first usage values of the plurality of usage environments,
• wherein the management server processor is configured to determine, as the first combinations, combinations of the respective first degradation values of the plurality of components and the respective first usage values of the plurality of usage environments with a smallest number of sums of the first degradation values and the first usage values exceeding a first upper limit value that indicates a maximum degradation degree at which the plurality of components reach an end of a lifetime thereof, and
• wherein the management server processor is further configured to determine the first combination by performing:
• a first process of determining whether the respective first degradation values of the plurality of components exceed the target value;
• a second process of choosing, in order, for each component of the plurality of components a first degradation value of which exceeds the target value, usage environments by which each of the sums does not exceed the first upper limit value and an absolute value of a difference between each of the sums and the target value is smallest;
• and
• a third process of choosing, in order, for each component of the plurality of components the first degradation value of which is equal to or lower than the target value, usage environments by which each of the sums does not exceed the first upper limit value and an absolute value of a difference between each of the sums and the target value is smallest, from usage environments among the plurality of usage environments that are not chosen at the second process.