New material makes cooling devices more energy-efficient
Cooling devices are considered to be power guzzlers, in which polluting refrigerants are still used, even after the ban on chlorofluorocarbons (CFCs). An environmentally friendly alternative are systems which use water instead.
A research team at the Institute of Inorganic Chemistry at Kiel University, together with the Fraunhofer Institute for Solar Energy Systems ISE in Freiburg, has developed a highly-porous material, with which these cooling systems can be operated using less electrical energy than before. Previously-unused waste heat, e.g. from district heating systems, data centres, or heat from solar thermal collectors could be used for that. The results have been published recently in the journal Advanced Materials.
Data centres in particular are real energy factories: as a side-effect of their operations, high-performance computers produce a lot of heat, and must therefore be cooled continuously. As such, they cause high energy and power costs, while giving off unused waste heat to the environment at the same time – its temperature is too low for other uses.
Theoretically, however, this could be used for running energy-efficient cooling systems, which use water as a refrigerant (so called adsorption-driven chillers). To do so, the material used there must be able to absorb a lot of water and regenerate at the lowest possible temperatures.
Environmentally-friendly and resource-saving cooling
The porous material, developed by Professor Norbert Stock from the Institute of Inorganic Chemistry and his working group, fulfils these requirements. This way parts of the cooling process of adsorption-driven chillers can be operated using only the energy from existing waste heat or solar thermal systems. “This could also make an important contribution to the use of renewable energies,” said Stock. For environmentally friendly systems like this the material has two key advantages: “The systems consume less power, and we can produce the material in an eco-friendly manner,” explained the inorganic chemist.
In these so-called adsorption-driven chillers, the cooling effect occurs when ambient heat is extracted by the evaporation of water. The molecules of water vapour are deposited in the cavities of a porous material, called sorbents, i.e. adsorbed by it. In the following regenerative phase the material is dried by applying thermal energy. The stored water molecules are released, liquefy and can be evaporated again in the next cycle. The material can also be used again.
Highly-porous metal organic frameworks provide ideal interactions
Sorbents used in cooling systems are usually crystalline zeolites or silica gels, which can easily absorb water due to their structure. The research team’s material exhibits particularly good sorption properties: it can absorb a lot of water very quickly, and also release it quickly again – even at a low increase in temperature. The material is thus quickly ready for use again. “This is made possible by the optimal size of the pores in the material, and its perfect interaction with the water molecules,” explained Stock. The highly-porous crystal structure of “CAU-10-H” – which is the official name of the material, named after development location, version number and the abbreviation of hydrogen – is an example of a metal organic framework (MOF). They have been tested in a wide range of areas of application in recent years.
From fundamental research to practical application
The Kiel working group has already been pursuing the discovery of new MOFs for a long time – but previously only as pure fundamental research. For transfer to an industrial application, they worked with colleagues from the Fraunhofer ISE to coat commercially available heat exchangers with their material. “The survey of the heat exchanger under application-related conditions shows the high potential of the material” said Dr Stefan Henninger from the ISE. In the laboratory, the material can already be produced in kilogramme quantities under mild reaction conditions, i.e. at a temperature of 100°C with water as a solvent (“green synthesis”). “In order to produce the material for an industrial use on a larger scale, our next step is to contact other companies,” said Stock. They have already applied for a patent for their production method.
From 23 until 27 April 2018, the research team will be presenting the material and its applications at the Kiel University booth at the Hannover Messe (Hall 2, Research & Technology, Booth C07). In addition, Professor Stock will present a lecture on-site on Wednesday 25 April 2018 at 2.30pm and 5pm, titled “Nanoporous materials for modern and environmentally-friendly cooling and air-conditioning”. The state university is represented at the world's largest industrial trade show for the second time, and presents innovative contributions from the research and industrial location of Schleswig-Holstein: http://www.uni-kiel.de/hannovermesse
Scalable Green Synthesis and Full-Scale Test of the Metal–Organic Framework CAU-10-H for Use in Adsorption-Driven Chillers. Dirk Lenzen, Phillip Bendix, Helge Reinsch, Dominik Fröhlich, Harry Kummer, Marc Möllers, Philipp P. C. Hügenell, Roger Gläser, Stefan Henninger and Norbert Stock. Advanced Materials. https://doi.org/10.1002/adma.201705869
Photos are available to download:
Caption: For their tests, they coated a conventional heat exchanger (as used in commercial refrigeration equipment) with the new material, in cooperation with colleagues from the Fraunhofer Institute for Solar Energy Systems.
Photo: Dirk Lenzen
Caption: With their newly-developed material called “CAU-10-H”, shown here in powder form, the Kiel research team aims to make cooling systems more efficient.
Photo: CAU/Stock working group
Caption: Different atoms (green = aluminium, red = oxygen, grey = carbon) together form the framework structure of CAU-10-H, which was developed at Kiel University. In the large pores, it can absorb and release water molecules (blue) highly efficiently.
Image: Dirk Lenzen
Prof. Dr Norbert Stock
The Institute of Inorganic Chemistry
Dr Stefan Henninger
Fraunhofer Institute for Solar Energy Systems (ISE)
Materials and Components for Heat Transformation
Christian-Albrechts-Universität zu Kiel
Press, Communication and Marketing, Dr Boris Pawlowski, Text/editing: Julia Siekmann
Postal address: D-24098 Kiel, Germany,
Telephone: +49 (0)431 880-2104, Fax: +49 (0)431 880-1355
E-mail: email@example.com, Internet: www.uni-kiel.de, Twitter: www.twitter.com/kieluni Facebook: www.facebook.com/kieluni, Instagram: instagram.com/kieluni
Alle Nachrichten aus der Kategorie: Materials Sciences
Materials management deals with the research, development, manufacturing and processing of raw and industrial materials. Key aspects here are biological and medical issues, which play an increasingly important role in this field.
innovations-report offers in-depth articles related to the development and application of materials and the structure and properties of new materials.
Scientists achieve higher precision weak force measurement between protons, neutrons
Through a one-of-a-kind experiment at the Department of Energy’s Oak Ridge National Laboratory, nuclear physicists have precisely measured the weak interaction between protons and neutrons. The result quantifies the weak…
High-performance single-atom catalysts for high-temperature fuel cells
Individual Pt atoms participate in catalytic reaction to faciitate the electrode process by up to 10 times. Single-atom Pt catalysts are stable at 700 degrees Celsius and expected to stimulate…