TDW 4240 HotBox Test Chamber
HotBox Test Chambers – For determining the stationary heat transfer properties of complex components and finished products used in construction such as doors, windows and bricks
Our HotBox is a constructively complex test apparatus for determining the heat transfer properties of wall elements, walls, windows and doors. In the HotBox, it is possible to simulate real-world conditions as they would exist for a building wall, by simulating conditions both inside the building and on the outside of the wall. To do so, temperature, humidity, air speed and radiation properties on both sides of the test wall must be detectable and precisely adjustable.
In contrast with conventional analysis methods for determining the Thermal ConductivityThermal conductivity (λ with the unit W/(m•K)) describes the transport of energy – in the form of heat – through a body of mass as the result of a temperature gradient (see fig. 1). According to the second law of thermodynamics, heat always flows in the direction of the lower temperature.thermal conductivity (e.g., laser flash, plate method or transient source), the HotBox takes into consideration not only the heat conduction through the test specimen (pure material dependence), but also the heat transfer conditions (material properties and ambient conditions). Thus, for example, the surface structures of walls (e.g., from fluid to solid) or the transmission properties of window panes have a direct influence on the effective heat transfer.
The compact test chamber TDW 4240 is designed for testing elements and components used in construction, such as windows, profiles, doors, domes and brick walls. It basically simulates the temperature and the natural convection inside and outside a building. Optionally, the humidity level in the two sections of the chamber can be set as needed. The HotBox software at the measurement and control unit is used to set all parameters as well as for complete data logging, detailed analysis and printing of test reports. There are also other devices, accessories and materials available that allow for sample preparation and conditioning to optimize the testing procedure.
The heat flow through a brick wall or a window part is defined by the U-value in [W/(m²K)]. The lower the U-value, the better the insulation property of the respective part of the building and therefore the greater the energy efficiency of the building as a whole.
This illustrates the need to determine the U-value for all parts of the building envelope, such as brick walls, facades, windows and doors. Stationary methods are usually preferred for larger inhomogeneous samples.
Just as with the heat flow meter or the guarded hot plate, the HotBox technique is an established method. At NETZSCH, we offer systems with heat flux sensors, HotBox systems and combinations of the two.
Method
Thermal ConductivityThermal conductivity (λ with the unit W/(m•K)) describes the transport of energy – in the form of heat – through a body of mass as the result of a temperature gradient (see fig. 1). According to the second law of thermodynamics, heat always flows in the direction of the lower temperature.Thermal Conductivity – A Key Parameter for Improved Energy Efficiency
HotBox Test Chambers with with Guarded Hotbox
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 (see left side of the diagram) the ambient conditions outside a building are simulated. The conditions on the inside of a building are simulated in the warm section (see right side of the scheme). The temperature ranges and the convection fulfill the requirements set forth in 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 and on the specimen are used to capture the data pertaining to temperatures, convection and humidity. The test frame positioned between the cold and the warm sections holds the specimen and the test mask and minimizes lateral thermal influences. The test frame is locked airtight with both sections of the chamber for the duration of the test.
All features at a glance
- Insulated warm and cold sections with heat exchangers and air deflectors, radial fans, roll chassis on guiding rails and 12-point locking system
- Hotbox with axial fan, air deflectors, roll chassis and hydraulic cylinders
- Insulated test frame with roll chassis and openings for sample insertion via forklift
- Recirculation cooler with water cooling for temperature control of warm and cold sections
- Control rack unit with measuring and control modules, PC, printer and 23" monitor
- Interfaces: 1 x RS232, 2 x USB, 1x Gigabit Ethernet
- 2 IsothermalTests at controlled and constant temperature are called isothermal.isothermal blocks with 60 measuring points each, 1 set of thermocouples, flow sensors, 2 heat flow meters with guard plates
- Single license for HotBox software
- 4 calibration panels with factory calibration certificate
- 1 set stainless steel guide rails for warm and cold sections
| TDW 4240 | |
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| Measuring range |
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| Sample dimensions – window (H x W) |
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| Sample dimensions – door (H x W) |
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| Specimen thickness (D) | Up to 560 mm |
| Temperature range |
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| Interface | 1x RS 232,1x Gigabit Ethernet |
| Dimensions (H x W x D) |
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| Power supply | 230 V / 400 V / 50 Hz |
| Weight | 4680 kg |
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