With Guarded Hotbox
Hotbox Test Chambers with Guarded Hotbox according to DIN EN ISO 8990, DIN EN 12412, DIN EN ISO 12567, ASTM C-1363, DIN EN 1121 (Measurement principle)
Hotbox test chambers with guarded hotbox are primarily used for determining the stationary heat transfer properties of elements and components used for construction, such as windows, profiles, doors and domes.
The test chamber consists of a cold and a warm section, the hotbox and a test frame with test mask 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 guarded hotbox is installed in the warm section and completely encloses the component to be tested with the respective test mask. Numerous sensors at the air deflectors, inside the sections and the hotbox as well as on the 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 specimen and the test mask 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.