News • 28.05.2018

New material makes cooling devices more energy-efficient

Environmentally friendly alternatives are systems which use water

For their tests, they coated a conventional heat exchanger (as used in...
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
Source: Dirk Lenzen

Waste heat from industry can often not be utilised because of its low temperature. With this material, it can be used in environmentally friendly cooling systems for example in the field of building technology.

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. 

Source: Christian-Albrechts-Universität zu Kiel

related articles:

popular articles:

Thumbnail-Photo: When shopping becomes experiential
28.10.2020   #shop design #design

When shopping becomes experiential

Redesign of the Intrend Store in Montesilvano, Italy

Shopping becomes experiential thanks to the soft atmosphere and precious materials that define the style of the project in the new Intrend store in Montesilvano (Italy) designed by Italian architects Silvio Binini, Emanuele Piccinini, and Paola ...

Thumbnail-Photo: Showroom, store, atelier and event space at Quartz Co.’s first boutique...
03.11.2020   #shop design #design

Showroom, store, atelier and event space at Quartz Co.’s first boutique

Contemporary Nordic Lifestyle as inspiration for shop and furniture design

Quartz Co., a company specializing in Canadian-made winter jackets, enlisted Blanchette Architectes, Rainville Sangaré, and A+ to develop its first retail space located at 5445 avenue De Gaspé, in Montréal. The furniture was ...

Thumbnail-Photo: SWIX concept retail store in historic Lake Placid...
10.02.2021   #shop design #fashion

SWIX concept retail store in historic Lake Placid

Shopping for winter sports enthusiasts at Winter Olympic Games town

SWIX announced that this holiday season the brand is launching its first U.S. retail outlet, its Concept Store, at the Mt. Van Hoevenberg Ski Stadium in Lake Placid, N.Y. The story features a modern layout and design and will highlight products from ...

Thumbnail-Photo: Design and decoration in every nook and cranny...
21.10.2020   #shop decoration #shop design

Design and decoration in every nook and cranny

Let your eyes wander: Shop design ideas for ceilings and floors

Shopping is a 360 degree experience. Customers not only see what's at eye level, on shelves or on merchandise tables. The entire space – from the floor to the ceiling – helps to shape the impression created by the room. ...

Thumbnail-Photo: A show-stopping retail environment with timeless appeal...
20.10.2020   #shopfitting #shop design

A show-stopping retail environment with timeless appeal

“The space respects people’s different ways of shopping”

When a long-established jewelry store prepared to make the move to a better-trafficked location, the owners saw an opportunity to embrace a new look that would appeal to a fresh generation of shoppers. While they wanted the new retail environment to ...

Thumbnail-Photo: How COVID-19 vaccines will impact current shopping habits?...
08.02.2021   #security #brick and mortar retail

How COVID-19 vaccines will impact current shopping habits?

Americans still expect safety precautions in-store

For some, widespread vaccinations offer a glimmer of hope that life will soon return to normal. However, with many Americans (44 percent) planning not to receive the vaccine, consumers say vaccinations will hardly change their current shopping ...

Thumbnail-Photo: A bold stroke: the new Joe Fresh flagship store...
02.12.2020   #shop design #fashion

A 'bold stroke': the new Joe Fresh flagship store

Interior design as point of memory for shoppers

The newly opened Joe Fresh Flagship store in Toronto offers an energizing environment experience. Designed by Burdifilek, the unique retail space embodies the essence of the Joe Fresh brand, resulting in a youthful, fashion-forward, and fresh ...

Thumbnail-Photo: New flagship store by Molteni Group in Paris...
28.01.2021   #shop design #store branding

New flagship store by Molteni Group in Paris

“Lit and furnished like the wings of a theatre”

The Molteni Group is opening a new window on the world, in 22 Rue de Saints Pères, in the seventh arrondisement, the heart of the Parisian rive gauche. The spirit of a unique, evolutionary project, in line with modernity and true to its own ...