Patent ID: 8583397

Claim:
A device for determining the thermal exchange coefficient between a fluid (F) and a wall (P) at a point P N of a surface of the wall (P) in contact with the fluid (F), characterized in that it includes: a temperature-measuring device (DT) which includes: two wall temperature sensors (D 1 , D 2 ), with a first temperature sensor (D 1 ) measuring a first temperature value T c1 of the wall at a point P 1 and a second temperature sensor (D 2 ) measuring a second temperature value T c2 of the wall at a point P 2 which is roughly aligned with point P 1 in a straight line normal to the surface at point P N , and where point P 1 is the closer to the surface of the wall, and a fluid temperature sensor (DF) measuring a temperature value T F of the fluid at a point P F of the fluid roughly aligned with points P 1 and P 2 , and a computer (C) which includes: first means for calculating, from the temperature values T C1 and T C2 , a temperature value T p of the wall and a thermal flow Φ given by the following equation: Φ=−λgrad ( T C1 − T C2 ), where λ is the thermal conductivity of the wall, and second means for calculating, from fluid temperature T F , temperature T P and thermal flow Φ the thermal exchange coefficient h in the following form: h =Φ/( T F − T P ).