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The award-winning Phase Change Matters blog tracks the latest news and research on phase change materials and thermal energy storage. E-mail tips and comments to Ben Welter, communications director at Entropy Solutions. Follow the blog on Twitter at @PureTemp. Subscribe to the monthly PCM newsletter. Or join the discussion on LinkedIn.

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Sunamp's UniQ heat storage product earns RAL certification

Ben Welter - Monday, December 16, 2019

The RAL Quality Association PCM has awarded the RAL Quality Mark to Sunamp Ltd. for its UniQ line of thermal batteries.

RAL quality markThe product, which has been installed in thousands of homes across Europe, uses a specially formulated phase change material to store large amounts of energy from renewable and other sources and release it as heat to deliver hot water and space heating as needed. The PCM is sodium acetate trihydrate-based with a patented formulation giving a melt point of 58 degrees Celsius. 

In independent testing conducted by ZAE Bayern, the PCM was successfully melted and solidified in a UniQ heat battery for 10,000 cycles. At the end of the test, no significant differences in stored thermal energy capacity were found between the cycled samples and an uncycled sample of the PCM. The product, which also passed leak testing, earned the association's highest level of certification, Grade A. 

Over 3,000 UniQ units are now in service, with Sunamp projecting a tenfold growth in sales next year. The quality mark will be featured on Sunamp’s website and in other marketing materials, UniQ manuals and product labels.

“We are delighted that our thermally charged UniQ product range of heat batteries has been awarded a globally recognized mark of quality,” said Kate Fisher, Ph.D., a materials integration scientist at Sunamp, which is based in Edinburgh, Scotland. “RAL certification is a huge accolade and cements Sunamp’s position as world leaders at the forefront of the technology.”

Sunamp UniQ heat batteriesThe RAL Quality Association PCM was established in 2004 to develop standards for the PCM industry. Members include Axiotherm, Microtek Laboratories, Rubitherm, Croda Europe, va-Q-tec, PCM Technology, Global-Systems Europe, Sasol, Sunamp, Pluss Advanced Technologies and PureTemp LLC.

Members and non-members alike can submit their products to the association for independent testing and earn the RAL Quality Mark. To qualify for the mark, products and materials must meet standards for energy storage capacity and phase transition temperature and stability, as defined in RAL-GZ 896.

“I am delighted that more and more products with PCM technology can be awarded the RAL Quality Mark as meaningful and transparent proof of quality and longevity,” said Stefan Thomann, the association’s managing director. “The great thing about Sunamp´s UniQ heat batteries is that they can be installed and used in homes very easily and save a lot of energy costs and carbon emissions immediately. The fact that they passed more than 10,000 cycles make sure that users will be able to profit from these benefits for decades.”

PCM briefing: Advanced Building Skins presentations are online; Ecozen raises $6 million

Ben Welter - Monday, December 16, 2019

• Presentations given at the 14th Conference on Advanced Building Skins in Switzerland in October are available via download for 80 euros. Among the topics: "Thermal performance of engineered wood flooring impregnated with phase-change materials," Damien Mathis, University LAVAL, Fontenay-sous-Bois, France; "Thermal comfort modelling and its impact on building energy performance," Vikram Sami, Olson Kundig, Seattle, Wash.; and "Integrated solar electric/thermal cooling system with storage," Mohannad Bayoumi, King Abdulaziz University, Jeddah, Saudi Arabia.

Loughborough University researchers have been awarded funding to help with the design and development of a four-wheeled electric vehicle for research, teaching and outreach in India. Engineers at Vellore Institute of Technology and PSG College of Technology, both located in Tamil Nadu, will work with Loughborough researchers to explore the use of phase change material and other technologies to manage battery heat. The high ambient temperatures in south India and similar climates can significantly reduce battery life in electric vehicles.  

• Energy storage specialist 1414 Degrees has announced plans to acquire SolarReserve Australia II, which owns the Aurora Solar Energy Project in South Australia and two solar sites in New South Wales. The Adelaide, Australia, company plans to use the Aurora site to build a 400 MW solar farm with thermal storage capacity of several thousand megawatt hours. The technology stores electricity as thermal energy by heating and melting containers full of silicon.

• Agritech startup Ecozen of Pune, India, which makes portable solar cold rooms for use on small farms, has raised a total of $6 million to fuel its growth phase. The cold rooms feature a PCM-equipped thermal storage unit that can store power for more than 36 hours in case of cloudy or rainy weather.  

Advanced Cooling Technologies Inc. of Lancaster, Penn., is seeking qualified research and development engineers at various experience and education levels to work on space, defense and energy-related applications. 

• Andreas Hauer, head of the energy storage department at ZAE Bayern (the Bavarian Center for Applied Energy Research) has joined the board of directors at the International Solar Energy Society.