TDW 4040
HotBox Test Chamber
Highlights
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 4040 was designed for testing brickwork (such as brick, lime sand brick, concrete, or aerated concrete) and 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 units 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 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 Heat Flow Meter
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 (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 (right hand side in the diagram above). The temperature ranges and the convection fulfill the requirements are set forth in 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 pertaining to temperatures, convection and humidity.
The test frame positioned between the cold and the warm sections holds the brickwork specimen and minimizes lateral thermal influences. The test frame is locked airtight with both sections of the chamber for the duration of the test.
NETZSCH offers more exciting products that support you in measuring Thermal Conductivity:
Specifications
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
- 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
- 2 IsothermalTests at controlled and constant temperature are called isothermal.isothermal blocks with 60 measuring points each, 1 set ot thermocouples, flow sensors, 2 heat flow meters with guard plates
- Control rack unit with measuring and control modules, PC printer and 23" monitor
- Interfaces: 1x RS232, 2x USB, 1x Gigabite Ethernet
- Single license for HotBox software
- 2x calibration panel with factory calibration certificate
- 1 set stainless steel guide rails for warm and cold sections
| TDW 4040 | |
|---|---|
| Measuring range | R: 0.10 to 8.00 m²·K/W |
| Specimen size (L x W) | 1500 mm x 1500 mm (brick wall) |
| Specimen thickness (H) | Up to 360 mm |
| Temperature range |
|
| Interface | 1x RS 232,1x Gigabit Ethernet |
| Dimensions (H x W x D) | 300 cm x 500 cm x 360 cm |
| Power supply | 230 V / 400 V / 50 Hz |
| Weight | 3890 kg |
Brochures and Data Sheets:
Proven Excellence in Service
At NETZSCH Analyzing & Testing, we offer a comprehensive range of services globally to ensure the optimal performance and longevity of your thermoanalytical equipment. With a track record of proven excellence, our services are designed to maximize the effectiveness of your devices, extend their lifespan, and minimize downtime.
Unlock the full potential of your equipment with our tailored solutions, backed by years of industry expertise and innovation.
Software
Universal program for control, data logging and analysis for test chambers for determining stationary heat transfer properties
Supported Testing Methods
- Method with heat flow meter
in accordance with ISO 8301, ASTM C518, DIN EN 1946-3, EN 12664, EN 12667 and EN 12939 - Method with controlled hotbox
according to DIN EN ISO 8990, DIN EN 1946-4, DIN EN ISO 12567, DIN EN 12412, ASTM C-1363 for standard windows, profiles, standard doors and surface shells
Functions
- Choice of manual or automatic measuring procedure with up to 16 definable measuring points per measurement
- Integrated calibration routines ∙ Display of all relevant data, measuring results, intermediate and final results as graphs and tables
- Measuring point function test and monitoring with defined limit values
- Monitoring of the test chamber with display of relevant messages and automatic shutdown when exceeding critical limits
- Extensive mathematical functions
- Numerical and graphical report generation in accordance with current standards
- Security concept with user and administrator level
Related Devices
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