Thermocouple heating impact on the temperature measurement of small volume of water in a cooling system

•Heating impact of measuring temperature using thermocouple on Centeo-TG40 cooling device.•Heating impact causes an overestimation in temperature thus requiring a correction.•Size of thermocouple affects the heating impact.•Challenges associated with the temperature measurement are addressed.•Validation with compressive analysis is performed by numerical modelling.