Thermal conductivity measurements
Basic Information
Name: | Thermal conductivity measurements | |
Facility: | Chair of Thermodynamics | |
Partner: | Technische Universität Dresden (TUD) |
Short Description
Description
Various methods are available at the Chair for measuring thermal conductivity.
1. Hot plate method
- Hot plate apparatus based on DIN EN 12664
- Surface temperatures and heat flow are measured in steady state
- Determination of the effective thermal conductivity of homogeneous and inhomogeneous samples
- Measurement is carried out in a climatic chamber under defined conditions
Technical data
Samples: Solids plate-shaped with plane-parallel surfaces
Sample dimensions: Area depending on heat flow plates at least:
- 30 mm x 100 mm
- 120 mm x 120 mm
- 250 mm x 250 mm
Sample thickness depending on thermal conductivity > 10 mm
Temperature range: -10 °C to 60 °C
Measuring accuracy: ±6 % for Styrodur reference (≈0.035 W m−1 K−1)
2. Hot wire method
- non steady state measurement with hot wire for heat supply and measurement of the temperature change
- Determination of thermal conductivity from analytical solution of the heat conduction equation assuming a line source in the infinitely volume
Technical data
Samples: powders, bulk solids, liquids, solids (after solidification around the probe)
Sample dimensions: Cylindrical measuring container - diameter 50 mm
- Height 200 mm
Temperature range: -10 °C to 60 °C
Measuring accuracy: ±5 to ±10 %
3. Applied Precision Isomet 2114
- non steady state commercial device for measuring thermal conductivity and volumetric heat capacity
- Needle probe for powders, bulk solids, solids and surface probe for solids
- Measurement performed in a climatic chamber under defined conditions
Technical data
Samples: powders, bulk solids, solids
Sample dimensions: Insertion probe - diameter min. 40 mm
- Height min. 80 mm
Contact probe - diameter min. 60 mm
- Thickness min. 40 mm
Temperature range: -20 °C to 70 °C
Measuring accuracy: ±5 % in the range 0.015 to 0.70 W m−1 K−1
±10 % in the range 0.7 to 6.0 W m−1 K−1
Link to Further Details
Types of Service
- This service is provided as a research activity e.g. as a development or improvement of methods tools or within research collaborations.
Points of Contact
Last Update
Last updated at: 21 May 2024 at 07:16:11