Angstrom configuration for absolute measurement on heat losses of metal sample by active thermography

Obtaining the precise value of the sample averaged heat loss coefficient has been a challenge that yet is not been satisfactorily resolved. This paper proposes an experimental setup and an optimized method to evaluate the averaged heat loss coefficient by the surface of the metal sample without need to know the thermal properties of the sample. A thermal camera along with the heat flow sensors was used to measure the heat loss coefficient in an absolute (non-relative) way. Also, a numerical simulation was done where minimum approximations are applied, and it is not necessary to make any adjustments with a complicated theoretical model. Then, it was experimentally demonstrated that the heat loss coefficient does not depend on the thermal properties of the metal sample. The influence in the difference of the temperature of the sample with the room temperature, on the factor h is monotonously increasing independent from heating or cooling regime. The proposed method has the advantage that the value of the heat loss coefficient is obtained experimentally, and the results are congruent with the COMSOL simulation outcomes.