Current research projects

Image Heat2Power
Image Performance tests of condensing units
Image Preformance measurements of heat exchangers
Image Testzentrum PLWP at ILK Dresden
Image Practical training, diploma, master, bachelor
Image Performance tests of refrigerant compressors
Image Hydrogen and methane testing field at the ILK
Image Development of test methods and test rigs for stationary integrated refrigeration units
Image Measurements on ceiling mounted cooling systems
Image Innovative cryogenic cooling system for the recondensation / liquefaction of technical gases up to 77 K
Image Influenced melting point of water by magnetic field
Image Modular storage system for solar cooling
Image Development of a Cryogenic Magnetic Air Separation Unit
Image Electrochemical decontamination of electrically conducting surfaces „EDeKo II“
Image Humidifier System for High-Purity Gases
Image Ice Slurry Generation

You are here:  Home /  Testing Equipment


Corrosion inhibitor for ammonia absorption systems

EURONORM GmbH

07/2021-08/2023

Dr. rer. nat. Franziska Krahl

+49-351-4081-5421

An alternative to chromium(VI) compounds

Project management: Dr. Franziska Krahl, Dr. Steffen Feja

Unlike electrically driven compression chillers or compression heat pumps, ammonia absorption systems (chillers and heat pumps) are driven by thermal energy. If the thermal energy comes from solar thermal energy, geothermal energy or waste heat, for example, these machines can be operated without fossil fuels. The working substances water and ammonia used are naturally occurring compounds, do not contribute to global warming (GWP = 0) and also have no ozone depletion potential (ODP).

The research project focused on identifying a suitable corrosion inhibitor for ammonia absorption systems to replace chromium(VI) compounds. A strategy was developed to enable the investigation of a large number of potential alternatives. From a total of more than 200 substance combinations (test approaches), 12 promising alternatives for further laboratory tests were identified using a rapid test developed in the project.

The rapid test developed proved to be very efficient in terms of identifying potential corrosion inhibitors. By using sealed reaction chambers, this test can also be carried out at significantly higher temperatures, which means that conditions close to the application are already present during screening.

At the end of the research project, 3 chromium(VI)-free corrosion inhibitors for ammonia absorption systems will be available, the basic suitability of which has been proven in laboratory tests. Their effectiveness is now to be tested in demonstrators.


Your Request

Further Projects - Testing Equipment

Image

Swirl-free on the move...

...with a contra-rotating fan

Image

Cold meter

The fast way to refrigerating capacity

Image

Innovative small helium liquefier

Liquefaction rates from 10 to 15 l/h

Image

Micro fluidic expansion valve

for increasing of the efficiency of small and compact cooling units