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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 weekly PCM newsletter. Or join the discussion on LinkedIn.

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Research roundup: Fabrication of shape-stable composite PCMs; battery thermal management; segmented heat storage; more

Ben Welter - Wednesday, April 18, 2018

Fabrication of shape-stable composite phase change materials based on lauric acid and graphene/graphene oxide complex aerogels for enhancement of thermal energy storage and electrical conduction [Thermochimica Acta]

Performance analysis of PCM based thermal energy storage system containing nanoparticles [International Research Journal of Engineering and Technology]

Cold temperature performance of phase change material based battery thermal management systems [Energy Reports]

Design and functionality of a segmented heat-storage prototype utilizing stable supercooling of sodium acetate trihydrate in a solar heating system [Applied Energy]

Macro-encapsulation and characterization of chloride based inorganic phase change materials for high temperature thermal energy storage systems [Applied Energy]

Parametric analysis of a residential building with phase change material (PCM)-enhanced drywall, precooling, and variable electric rates in a hot and dry climate [Applied Energy]

Fabrication of high thermal conductive shape-stabilized polyethylene glycol/silica phase change composite by two-step sol gel method [Composites Part A: Applied Science and Manufacturing]

Performance enhancement of cold thermal energy storage system using nanofluid phase change materials: A review [International Communications in Heat and Mass Transfer]

Development of form stable Poly(methyl methacrylate) (PMMA) coated thermal phase change material for solar water heater applications [4th International Conference on Civil and Environmental Engineering for Sustainability]

Patent application: Aerogel composites having thermal storage capacity

Ben Welter - Monday, April 16, 2018

U.S. patent application 20180079944 (applicant Aspen Aerogels Inc., Northborough, Mass.):

"The present disclosure can provide aerogel compositions which have a thermal storage capacity, and which are durable and easy to handle. The present disclosure can provide aerogel compositions which include PCM coatings, particle mixtures, or PCM materials confined within the porous network of an aerogel composition. The present disclosure can provide methods for producing aerogel compositions by coating an aerogel composition with PCM materials, by forming particle mixtures with PCM materials, or by confining PCM materials within the porous network of an aerogel composition."

http://www.freepatentsonline.com/20180079944.pdf

Patent application: Method and apparatus for maintaining a minimum temperature in a fluid

Ben Welter - Monday, April 16, 2018

Subsea device patent drawingU.S. patent application 20180080722 (applicant GE Oil & Gas UK Ltd., Newcastle-upon-Tyne, Great Britain):

"Apparatus and method for maintaining temperature in a sub-sea device, in particular in relation to fluid in the device. A material having a high latent heat on phase change [303] is used to release latent heat to the fluid when the fluid temperature decreases towards a threshold value. ... The use of a phase change material in accordance with the present invention is also advantageous with other types of sub-sea pipe (such as rigid pipe), apparatus and installations where a degree of temperature control is desirable."

http://www.freepatentsonline.com/20180080722.pdf

Patent application: Hybrid method for transporting/storing temperature-sensitive materials

Ben Welter - Monday, April 16, 2018

U.S. patent application 20180100682 (applicant Cold Chain Technologies, Franklin, Mass):

"A method and system for transporting and/or storing temperature-sensitive materials. In one embodiment, the system may be a hybrid system that includes an active temperature-control system and a passive temperature-control system. The active temperature-control system may be, for example, a portable refrigerator that includes an internal chamber for maintaining contents within a desired temperature range. The passive temperature-control system, which includes at least one phase-change material (PCM) member and space for receiving one or more temperature-sensitive materials, may be removably positioned entirely within the internal chamber of the active temperature-control system. When temperature-sensitive materials are loaded into the passive temperature-control system and the passive temperature-control system is loaded into the active temperature-control system, the active temperature-control system keeps the temperature-sensitive materials within a desired temperature range and charges the PCM members for when the passive temperature-control system is thereafter removed from the active temperature-control system."

http://www.freepatentsonline.com/20180100682.pdf

Patent application: Thermal energy storage pallet

Ben Welter - Monday, April 16, 2018

Viking Cold Solutions patent drawing

U.S. patent application 20180099778 (applicant Viking Cold Solutions Inc., Houston, Texas):

"A pallet for shipping goods, the pallet having a rigid member, a phase change material, and a temperature indicate. The rigid member includes a phase change material compartment. A phase change material is disposed in the phase change material compartment. The temperature indicator indicates a thermal state of the pallet."

http://www.freepatentsonline.com/20180099778.pdf

PCM briefing: Epsom salts for seasonal heat storage; Formato joins Microtek Labs

Ben Welter - Monday, April 16, 2018

Chris Sansom, an associate professor in concentrating solar power at England's Cranfield University, says that magnesium sulphate heptahydrate, or Epsom salts, could be a viable material for seasonal heat storage. Adding water to the salts causes a reaction that creates heat at around 80 degrees C, a good match for space heating and hot water. Sansom is developing a heat storage system for the university’s growing campus. Because the school's CHP system requires a temperature of 90 degrees C, a slightly different form of salt, magnesium nitrate hexahydrate, will be used.

Richard M. FormatoRichard M. Formato, right, formerly R&D manager and principal technologist at Cold Chain Technologies, has joined Microtek Laboratories Inc., Dayton, Ohio, as director of new technology.

Sonoco ThermoSafe and Cathay Pacific Cargo announced a global partnership agreement for the leasing of the PharmaPort 360 temperature-controlled bulk shipping container. The agreement enables pharmaceutical shippers to lease the containers directly from Cathay Pacific Cargo.

Peli BioThermal is adding 13 drop points in Europe for its reusable temperature-controlled shippers. The drop points, located within Rhenus Logistics global network, are at airports in Prague, Copenhagen, Paris, Lyon, Munich, Stuttgart, Frankfurt, Dublin, Milan, Amsterdam, Warsaw, Basel and Barcelona. 

Alexium International Group Ltd. has announced that Susan Thomas has been appointed as Alexium's new chair, replacing Gavin Rezos, who announced in November that he would step down this year. Thomas, a technology entrepreneur with a background in law and corporate finance, will assume the role at a board meeting May 8.

• In a CHEManager article provocatively titled "Hard Times for Bio-based Products," the Frankfurt-based Society for Chemical Engineering and Biotechnology (DECHEMA) asks: What is the most promising bio-based chemical? Four chemicals are given a close look: succinic acid, glycerol, para-xylene and 1,2-propanediol. And the winner is ...

Contributions sought for new database on thermal storage materials

Ben Welter - Monday, April 16, 2018

A new database for thermal energy storage materials is being developed within the framework of the International Energy Agency’s Energy Conservation through Energy Storage group, Annex 29 and SHC Task 42.

The database is designed to provide characteristic data for phase change, sorption and thermochemical materials. The website, www.thermalmaterials.org, also offers a wiki with definitions related to thermal energy storage. Both areas are open for contributions.

The phase transition data provided for PCMs must be measured according to a DSC-measurement standard. To ensure the quality of the submitted data, contributors must provide a reference measurement using a PCM provided by Fraunhofer ISE.

Stefan Gschwander, head of Group Heat and Cold Storage at Fraunhofer ISE in Freiburg, Germany, said all submitted data will undergo a review process. “If the data is in line with our requirements it can be published in the public area,” he said.

So far, 15 PCMs are listed in the public area. A restricted area of the database is limited to  independently measured materials.

“The data stored is high-quality data which can be used for research, for example
simulation or to design a system,” Gschwander said. “So for our database, the manufacturers normally do not provide data but sample material that is measured from the institutions that are able to measure according the definitions. So far we have measured PCM from Rubitherm, Sasol and BASF. …

“So far we have about 20 different materials in the restricted area and, as we have used it for the development of the measurement standard, many of the materials have been measured several times by different laboratories so that we have a lot more measurements stored in the database.”

Fraunhofer ISE offers independent characterization of PCM, with fees depending on the material and the DSC required to do the measurement.

The ECES is a technology collaboration group that supports the development of electrical energy storage, thermal energy storage, distributed energy storage and borehole thermal energy storage. For more information on the material database project and characterization services, contact Gschwander at stefan.gschwander@ise.fraunhofer.de.

Research roundup: Microcapsule with SiO2-TiO2 hybrid shell; finned rectangular enclosures; glazed roof with PCM; more

Ben Welter - Wednesday, April 11, 2018

Synthesis and properties of phase change microcapsule with SiO2-TiO2 hybrid shell [Solar Energy]

Experimental investigation of melting behaviour of phase change material in finned rectangular enclosures under different inclination angles [Experimental Thermal and Fluid Science]

Phase change material based cooling of photovoltaic panel: A simplified numerical model for the optimization of the phase change material layer and general economic evaluation [Journal of Cleaner Production]

Influence of glazed roof containing phase change material on indoor thermal environment and energy consumption [Applied Energy]

Thermal field and heat storage in a cyclic phase change process caused by several moving melting and solidification interfaces in the layer [International Journal of Thermal Sciences]

A phase change microactuator based on paraffin wax/expanded graphite/nickel particle composite with induction heating [Sensors and Actuators A: Physical]

Research roundup: Solar thermal façades; domestic hot water system; triplex-tube heat exchanger; more

Ben Welter - Tuesday, April 10, 2018

Overheating protection of solar thermal façades with latent heat storages based on paraffin-polymer compounds [Energy and Buildings]

Single and combined phase change materials: Their effect on seasonal transition period [Energy and Buildings]

Macroencapsulation of sodium chloride as phase change materials for thermal energy storage [Solar Energy]

Investigation of PCM Charging for the Energy Saving of Domestic Hot Water System [Applied Thermal Engineering]

Physical and mechanical properties of fly ash and slag geopolymer concrete containing different types of micro-encapsulated phase change materials [Construction and Building Materials]

Accelerated melting of PCM in energy storage systems via novel configuration of fins in the triplex-tube heat exchanger [International Journal of Heat and Mass Transfer]

Swedish university developing PCM/TES design tool for buildings

Ben Welter - Monday, April 09, 2018

Researchers at Chalmers University of Technology in Sweden are developing a design tool for PCM-based thermal energy storage for heating and cooling of buildings.

The project is being conducted by the Division of Building Technology within the university's Architecture and Civil Engineering Department. Sweden's Environmental Protection Agency and Energy Agency and the university are jointly funding the effort.

To better understand the needs of potential users of the tool, the research team is inviting professionals in the building sector – such as real estate owners, energy consultants, PCM producers and specifying engineers – to participate in a survey, whether or not they have PCM experience. The survey can be completed in 10 to 15 minutes. Personal data will be kept confidential. Participants who wish to receive the findings of the survey are asked to provide their email address at the end of the questionnaire.

For more information on the project, contact Dr. Nikolaos Stathopoulos, nikstat[at]chalmers.se.

https://goo.gl/forms/iEYCD5zIDUlDW5eu1