Current research projects

Image Development of test methods and test rigs for stationary integrated refrigeration units
Image Air-water heat pumps
Image Mass Spectrometer
Image Preformance measurements of heat exchangers
Image Calibration leak for the water bath leak test
Image ZeroHeatPump
Image Laseroptical measurement
Image Hydrogen and methane testing field at the ILK
Image Pulse-Tube-Refrigerator with sealed compressor
Image Testzentrum PLWP at ILK Dresden
Image Influenced melting point of water by magnetic field
Image Solar Cooling
Image Ice Slurry Generation
Image Test rigs for refrigeration and heat pump technology
Image Electrochemical decontamination of electrically conducting surfaces „EDeKo II“
Image Refrigerants, lubricants and mixtures

You are here:  Home /  Research and Development


Investigation of material-dependent parameters

Industry and R&D

Gunar Schroeder

+49-351-4081-5129

Investigation of the permeation behavior

Permeation is the penetration of solid matter by another substance. The driving force for this is a gradient of the chemical potential of the permeate. In practice, this gradient is replaced by a measurable quantity such as the pressure gradient. The permeability of a material depends on the surface temperature and is usually specified with the unit \( \frac{\mu g}{cm^2\:min} \)

Without external influences, the permeate always moves in the direction of the lower concentration or the lower partial pressure. For theoretical consideration, permeation can be divided into three sections across the solid:

  • Sorption, for example, a gas is absorbed at the surface of the solid
  • Diffusion, this gas diffuses through the solid through molecular gaps towards the surface with a lower gas concentration
  • Desorption, the gas is released again from this surface

The experimental setup to investigate this process, see the following figures, essentially consists of a sample chamber. The sample is mounted with a seal or against a sealing surface. A test gas with a defined overpressure is applied to the volume on the "left" of the sample. The volume to the "right" of the sample is connected to a detector. The pressure on both sides of the sample, the temperatures and the gas flow rate are measured over a longer period of time (24 - 48 h).

Parameter Sample limits
materials plastics, metals
dimensions, diameter, and wall thickness 58 ... 60 mm, 1 ... 3 mm
other dimensions on request
pressure difference up to 10 bar (145 psi)
temperature range room temperature, other conditions on request
test gas helium or hydrogen
detector measuring range up to \(10^{-9} \frac{mbar\:l}{s} \), optional with calibration

 


Your Request

Further Projects - Research and Development

Image

ZeroHeatPump

Performance management of small heat pumps without energy consumption

Image

Cool Up

Upscaling Sustainable Cooling

Image

Breakthrough Sensor for Adsorption Filters (BelA)

Sensor system for detecting an imminent breakthrough in gas filtration