With Heat Flow Meter
Hotbox test chambers with heat flow meter are used to determine the stationary heat transfer properties of brickwork.
The test chamber consists of a cold and a warm section as well as a test frame that is positioned between the two sections of the chamber. Both sections contain heat exchangers for temperature control and air deflectors with radial fans to generate the necessary convection.
In the cold section (left hand side in diagram above) the ambient conditions outside a building are simulated. The conditions on the inside of a building are simulated in the warm section (right hand side in diagram above). The temperature ranges and the convection fulfill the requirements of the standard but can be adjusted to specific individual applications as needed. The heat flow meter with guarded zone is installed at the surface of the brickwork specimen to be tested in the warm section and completely covers the component to be tested. Numerous sensors at the air deflectors, inside the sections and on the brickwork specimen are used to capture the data regarding temperatures, convection and humidity.
The test frame positioned between the cold and the warm section holds the brickwork specimen and eliminates lateral thermal influences as much as possible. The test frame is locked airtight with both sections of the chamber for the duration of the test.