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: Luxury, tradition, and new trends
19.11.2018   #shop decoration #shop design

Luxury, tradition, and new trends

dlv tour 2018 to Tokyo

In collaboration with EuroShop, the dlv - Netzwerk Ladenbau e.V. shopfitters and suppliers network organizes a tour to a major city of the world once a year. Tour participants visit trendsetting locations that captivate with unique store designs. ...

Thumbnail-Photo: New design for TEDi
02.10.2018   #shopfitting #shop design

New design for TEDi

Wanzl shop solutions provide for even more attractive shops

Wanzl once again proves its worth when it comes to shop solutions. The long-established Leipheim company has played a key role in redesigning TEDi branches. TEDi is a growing retailer which currently has around 1,900 stores around Europe, and ...

Thumbnail-Photo: Colorful shop windows: Christmas decorating tips, part 1...
24.10.2018   #shop decoration #seasonal business

Colorful shop windows: Christmas decorating tips, part 1

From lilac to orange: something different for a change

Christmas is just around the corner. Gingerbread houses greet you in every supermarket and the early birds already wonder about the gifts they should buy. It’s high time to inspire potential shoppers to start buying Christmas gifts. ...

Thumbnail-Photo: Compartment Systeme POS TUNING
28.11.2018   #product presentation #POS Solutions

Compartment Systeme POS TUNING

For slim products such as drugstore ranges, confectionery and fresh products

POS TUNING has optimized its pushfeed program for use in retail. The new compartment systems by POS TUNING are available in three different sizes: C60 (6 cm height) for narrow products such as drugstore assortments, C90 (9 cm height) for sweets, ...

Thumbnail-Photo: retail trends 3/2018
01.10.2018   #customer relationship management #shop planing

retail trends 3/2018

Topics: retail technology, content management, lighing, interior design, and many more

Have a look at our printed edition as an e-paper. Desire for real paper? We will send you the latest issue. Inquiries to: service@iXtenso.com  Your iXtenso team   ...

Thumbnail-Photo: What shop design can look like: Indistrieel - India meets Industrial...
12.12.2018   #shopfitting #shop equipment

What shop design can look like: Indistrieel - India meets Industrial

For unique furniture and accessories, a visit to the rustic Dutch store is worthwhile

Skilful mixing: What do you get when you mix Indian furniture with industrial look? "Indistrieel". The shop in the town of Middelburg in the Netherlands offers really exciting furniture, lamps, accessories and bags. ...

Thumbnail-Photo: A new design for GebrauchtWarenHaus Westend in Munich...
30.11.2018   #shop building #shopfitting

A new design for GebrauchtWarenHaus Westend in Munich

Sustainable concept for a non-profit project of Weißer Rabe

Shopping with a clear conscience: This was the core concept of the new store for Weißer Rabe (English: white-necked crow, a nonprofit organization in Munich). When an additional 200 square meters of retail space freed up, the company was able ...

Thumbnail-Photo: Christmas tree alternatives: Christmas decorating tips, part 5...
31.10.2018   #shop decoration #seasonal business

Christmas tree alternatives: Christmas decorating tips, part 5

The classic among holiday decorations

In these parts, Christmas trees are the quintessential symbols of the Christmas season. They prompt children and adults to get into the Christmas spirit. Yet a live fir tree has two major disadvantages: it takes up a lot of space and drops its ...

Thumbnail-Photo: What shop design can look like: Foot Locker in London...
08.10.2018   #shopfitting #shop planing

What shop design can look like: Foot Locker in London

Brand communication and digitization at the Marble Arch Store

Power Stores is the name Foot Locker gives to its new stores in different locations. The most recently redesigned store is located near Marble Arch and Oxford Street. ...

Thumbnail-Photo: A story of ice and snow: Christmas decorating tips, part 4...
30.10.2018   #shop decoration #seasonal business

A story of ice and snow: Christmas decorating tips, part 4

Create a winter wonderland

Though the temperatures outside might not always reflect it, in these parts, winter puts us in the Christmas spirit. This makes white decorations and decorative artificial snow perfect tools to set the scene. A winter landscape with snow-covered ...

Supplier

iXtenso - Magazin für den Einzelhandel
iXtenso - Magazin für den Einzelhandel
Celsiusstraße 43
53125 Bonn
POS TUNING Udo Voßhenrich GmbH & Co KG
POS TUNING Udo Voßhenrich GmbH & Co KG
Am Zubringer 8
32107 Bad Salzuflen