C8.5 - Thermal decoupling of heat sources by means of PCM-shielding

AMA Conferences 2015
2015-05-19 - 2015-05-21
Nürnberg, Germany
Proceedings SENSOR 2015
C8 - Calibration & Testing
M. Schalles, T. Fröhlich, M. Röser - Technische Universität Ilmenau (Germany), J. Flügge - Physikalisch Technische Bundesanstalt, Braunschweig (Germany)
500 - 504


For optimisation of the thermal conditions in measuring instrumentation, one can use different active (air, liquid, peltier cooling) and passive cooling approaches. Since active cooling approaches may retroact to the measurement instrumentation or may add mechanical vibrations to the measuring instrumentation, passive cooling often is applied in instrumentation of highest measurement precision. Since the cooling power of passive cooling approaches is limited, a new passive cooling strategy was
developed at Technische Universität Ilmenau, which can be applied for thermal shielding or cooling of heat sources. This new passive cooling approach uses a specific Phase Change Material (PCM) with a melting temperature of Tm ≈ 20.5 °C as a heat sink. During the operation of the heat source, most of the parasitic heat is guided into this material and is stored as latent heat of the phase transition. As a consequence of this, the heat source is thermally shielded and the temperature in the surrounding
components is stabilised. This cooling principle was validated at the example of a camera which is part of the measuring microscope of the Nanometer Comparator at Physikalisch Technische Bundesanstalt, PTB, in Braunschweig. For proof of principle of PCM-shielding, a demonstration model of a PCM-cooling element was developed and optimised for this camera using thermal Finite Element Calculations.