Thermobox - measuring U-value / heat transfer, training measuring station
CAD model of the Thermobox
The thermobox consists of a heated, approx. 40x40x40 cm3, insulated housing. Exchangeable elements to be measured are mounted on the open side of the box. From the measurement of the temperatures on the inner and outer surfaces of the elements, the heat transfer coefficient (U-value) [W/(m2 K)] can be determined in the state of stationary temperatures. Furthermore, there is in principle the possibility to determine thermal properties such as temperature conductance [m2/s] and specific heat capacity [J/(kg K]) by dynamic measurement with given heating profiles.
Measuring elements with removable frames:
- Simply glazing
- Double glazing
- Double glazing with inert gas filling
- Concrete (UPC)
- Concrete with insulation
Measurement and control system:
- USB based analog and digital I / O module, RedLab
- USB temperature measurement module, RedLab
- Temperature control and data processing using LabVIEW
The detailed specification here as download.
A detailed description of the measurement processes and methods of evaluating the measured values can be found in the Master-Thesis of Syed Adeeb Ahmed.
Assembling of the "thermal transmittance measurement" apparatus
The finished measuring stations
Thanks to Beatrice Rodenbücher, Stefan Hess and Adeeb Ahmed for the pleasant and fruitful cooperation in the conception of the Thermobox.