Featured Research

from universities, journals, and other organizations

New material for more ecological, efficient and economic refrigeration systems

Date:
April 21, 2010
Source:
Universidad de Barcelona
Summary:
Researchers in Spain and Germany have developed a new solid material that produces a caloric effect under hydrostatic pressure (solid-state barocaloric effect). The work was carried out using a high-pressure system. The research was inspired by guidelines in the Kyoto protocol on renewing current refrigeration systems based on the compression of harmful gases.

Schematic representation of a refrigerator system based on the compression of a solid material. During decompression, the solid undergoes a phase transition that lowers its temperature. The cold solid absorbs heat, cooling the refrigerator. In the next stage, the solid is compressed, returning it to its original phase and increasing its temperature. Finally, the solid releases the excess heat into the atmosphere.
Credit: Image courtesy of Universidad de Barcelona

Two teams based at the Barcelona Knowledge Campus, one from the University of Barcelona (UB) and one from the Universitat Politècnica de Catalunya (UPC), have worked with a group from the University of Duisburg-Essen (Germany) to develop a new solid material that produces a caloric effect under hydrostatic pressure (solid-state barocaloric effect). The work was carried out using a high-pressure system developed by the UPC, which is the only one of its type in Spain.

Related Articles


The research is described in an article published in the scientific journal Nature Materials and was inspired by guidelines in the Kyoto protocol on renewing current refrigeration systems based on the compression of harmful gases.

Research into materials showing large caloric effects close to room temperature is one of the areas currently being explored to develop new refrigeration systems. Until recently, the most promising materials for applications in this field were giant magnetocaloric materials, which change temperature under the influence of an external magnetic field. The authors of this new study show that application of a moderate hydrostatic pressure to a nickel-manganese-indium alloy (Ni-Mn-In) produces results comparable to those achieved with the most effective magnetocaloric materials.

According to Lluís Mañosa, a professor with the Department of Structure and Constituents of Matter at the UB and principal investigator of the study, "the aim of this field of research is to identify materials that are efficient, economic and environmentally respectful, and the advantages of the alloy used in this study is that all of the component materials meet these requirements."

In addition, Antoni Planes, a professor with the same UN department, explains that, "this type of material can produce much greater caloric effects with only slight variations in pressure, which makes it ideal for domestic refrigeration systems (refrigerators, air conditioning, etc.)." When these alloys are submitted to an external field, either magnetic or pressure, the material undergoes a solid-state phase transition, and Lluís Mañosa explains that, "this phase change generates a considerable latent heat exchange." The physical principle involved is the same as the effect observed when an ice cube is placed into a glass of water: the ice absorbs heat from the water, lowering its temperature.

The experiments were carried out using a unique high-pressure system developed by the Materials Characterization Group at UPC, directed by Josep Lluís Tamarit, a professor with the Department of Nuclear Physics and Engineering. The system was designed to measure the temperatures during state changes according to the pressure and heat exchanged in the process.

According to the researcher Maria Barrio, who works for the same UPC department and co-authored the study, "studying the behaviour of materials under different pressures has a wide range of uses in many fields," and applications include various types of refrigeration systems, such as domestic refrigerators and air-conditioning systems, food storage facilities, industrial machinery and supercomputers. Scientists have understood the magnetocaloric effect for some time, and it has been used extensively in work requiring extremely low temperature, but it was not until the 1990s that experts discovered materials capable of producing a large magnetocaloric effect close to room temperature, or giant magnetocaloric effect.

In 2005, an article in Nature Materials presented the inverse magnetocaloric effect, under which the temperature of a material submitted to an external magnetic field decreases instead of increasing, which is the standard response of most magnetic materials.

The study, carried out as preparation for the doctoral thesis of Xavier Moya, under the direction of Lluís Mañosa (UB), was awarded the 2009 Ramon Margalef Prize by the UB Board of Trustees.

In addition to the barocaloric effect described above, the Ni-Mn-In alloy also exhibits the inverse magnetocaloric effect. As such, the magnetic field can be combined with exertion of hydrostatic pressure to produce the caloric effect, which can be modulated with a series of parameters to control the temperature. With this new material it is possible to observe the pressure and the magnetic field to control the state change at a desired temperature.


Story Source:

The above story is based on materials provided by Universidad de Barcelona. Note: Materials may be edited for content and length.


Journal Reference:

  1. Lluís Mañosa, David González-Alonso, Antoni Planes, Erell Bonnot, Maria Barrio, Josep-Lluís Tamarit, Seda Aksoy, Mehmet Acet. Giant solid-state barocaloric effect in the Ni-Mn-In magnetic shape-memory alloy. Nature Materials, 2010; DOI: 10.1038/nmat2731

Cite This Page:

Universidad de Barcelona. "New material for more ecological, efficient and economic refrigeration systems." ScienceDaily. ScienceDaily, 21 April 2010. <www.sciencedaily.com/releases/2010/04/100416193722.htm>.
Universidad de Barcelona. (2010, April 21). New material for more ecological, efficient and economic refrigeration systems. ScienceDaily. Retrieved October 25, 2014 from www.sciencedaily.com/releases/2010/04/100416193722.htm
Universidad de Barcelona. "New material for more ecological, efficient and economic refrigeration systems." ScienceDaily. www.sciencedaily.com/releases/2010/04/100416193722.htm (accessed October 25, 2014).

Share This



More Matter & Energy News

Saturday, October 25, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

IKEA Desk Converts From Standing to Sitting With One Button

IKEA Desk Converts From Standing to Sitting With One Button

Buzz60 (Oct. 24, 2014) — IKEA is out with a new convertible desk that can convert from a sitting desk to a standing one with just the push of a button. Jen Markham explains. Video provided by Buzz60
Powered by NewsLook.com
Ebola Protective Suits Being Made in China

Ebola Protective Suits Being Made in China

AFP (Oct. 24, 2014) — A factory in China is busy making Ebola protective suits for healthcare workers and others fighting the spread of the virus. Duration: 00:38 Video provided by AFP
Powered by NewsLook.com
Real-Life Transformer Robot Walks, Then Folds Into a Car

Real-Life Transformer Robot Walks, Then Folds Into a Car

Buzz60 (Oct. 24, 2014) — Brave Robotics and Asratec teamed with original Transformers toy company Tomy to create a functional 5-foot-tall humanoid robot that can march and fold itself into a 3-foot-long sports car. Jen Markham has the story. Video provided by Buzz60
Powered by NewsLook.com
Police Testing New Gunfire Tracking Technology

Police Testing New Gunfire Tracking Technology

AP (Oct. 24, 2014) — A California-based startup has designed new law enforcement technology that aims to automatically alert dispatch when an officer's gun is unholstered and fired. Two law enforcement agencies are currently testing the technology. (Oct. 24) Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:

Strange & Offbeat Stories

 

Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins