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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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Patent application: Pouch filled with PCM for use in crockery

Ben Welter - Thursday, July 25, 2019

Probalco PCM pouch patent drawingU.S. patent application 20190223636 (applicant Probalco BVBA, Kortrijk, Belgium):

"A pouch [510] filled with phase-change material [530], wherein the pouch comprises a preformed first wall [521] and a second wall, wherein the first wall comprises a bowl-shaped part, in which the phase-change material is accommodated, and a peripheral part, wherein the second wall is attached to the peripheral part of the first wall, wherein a high vacuum prevails in the pouch, and wherein the pouch is intended for placing against a wall to be heated or cooled. ... The present invention further relates to crockery provided with a pouch filled with phase-change material."

http://www.freepatentsonline.com/20190223636.pdf

Patent application: PCM-based enhancement for reversed-cycle defrosting

Ben Welter - Thursday, July 25, 2019

U.S. patent application 20190226735 (applicant Sunamp Ltd., Lothian, Great Britain):

"A thermal energy storage system in the form of a reverse-cycle defrosting vapour compression system suitable for use with systems adapted to transfer heat from at least one heat source to at least one heat sink (heat transfer system), wherein said thermal energy storage system comprises: at least two thermal energy storage units; said thermal energy storage units comprise a thermal store comprising a heat exchanger with the storage units comprising a primary coil and a secondary coil; the primary coil is dedicated for use with refrigerant fluids and is adapted for inter-connection to both a condenser and a pressure-lowering device for use with a heat transfer system; the secondary coil is dedicated for use with heat transfer fluids and wherein said secondary coils are adapted to exchange heat with the phase change material in each thermal storage unit; said primary and secondary coils are surrounded by a suitable phase change material."

http://www.freepatentsonline.com/20190226735.pdf

Patent application: Water-based thermal cooling gels with viscosity modifier

Ben Welter - Thursday, July 25, 2019

U.S. patent application 20190225853 (applicant Microtek Laboratories, Dayton, Ohio):

"Thermal cooling gel and cold packs enclosing such thermal cooling gel have an aqueous gel of 1% to 10% wt/wt of cellulose, 0.5 g/L to 2 g/L of an ice nucleating protein, and a biocide. The enthalpy of the thermal cooling gel is in a range of 250 J/g to 330 J/g."

http://www.freepatentsonline.com/20190225853.pdf

Research roundup: Diatomite‐based hydrated salt composites; zinc oxide coating of hermetically encapsulated paraffins; more

Ben Welter - Thursday, July 25, 2019

From International Journal of Energy Research:

Design of diatomite‐based hydrated salt composites with low supercooling degree and enhanced heat transfer for thermal energy storage

From Journal of Physical Chemistry B:

Clusters in Liquid Fatty Acids: Structure and Role in Nucleation

From Construction and Building Materials:

Development of thermal energy storage lightweight structural cementitious composites by means of macro-encapsulated PCM
Preparation of microencapsulated phase change materials used graphene oxide to improve thermal stability and its incorporation in gypsum materials

From Journal of Power and Energy:

Numerical modelling of phase change material melting process embedded in porous media: Effect of heat storage size

From Advanced Materials Interfaces:

Phase Change Materials: Doubly Coated, Organic–Inorganic Paraffin Phase Change Materials: Zinc Oxide Coating of Hermetically Encapsulated Paraffins

From NASA Technical Reports Server:

Utilization of Micro Tube Heat Exchanger for Next Generation Phase Change Material Heat Exchanger Development

From SN Applied Sciences:

Encapsulation of paraffin wax by rigid cross-linked poly (styrene divinylbenzene-acrylic acid) and its thermal characterization

From Energy Conversion and Management:

Transient performance of a Peltier super cooler under varied electric pulse conditions with phase change material

From Applied Thermal Engineering:

Thermal optimization of a kirigami-patterned wearable lithium-ion battery based on a novel design of composite phase change material
An experimental and theoretical study of the solidification process of phase change materials in a horizontal annular enclosure

From Journal of Energy Storage:

Enhancement of the thermal energy storage capacity of a parabolic dish concentrated solar receiver using phase change materials

From Renewable Energy:

Numerical simulation on the thermal performance of a PCM-containing ventilation system with a continuous change in inlet air temperature

From Energy Fuels:

Graphene modified hydrate salt/UV-curable resin form-stable phase change materials: continuously adjustable phase change temperature and ultrafast solar-to-thermal conversion

From Journal of Industrial and Chemical Engineering:

Thermal performance enhancement of a phase change material with expanded graphite via ultrasonication

From Chemistry Select:

Microencapsulation of Stearic Acid into Strontium Titanate Shell by Sol‐Gel Approach for Thermal Energy Storage

PCM briefing: Sunamp closes deal with Chinese manufacturing partner; window film captures, releases solar energy

Ben Welter - Friday, July 19, 2019

Sunamp UniQ 12 heat batterySunamp Ltd. has signed an agreement with Chinese partner Jiangsu Gomon New Energy to move forward with manufacturing of a heat pump water heater based on Gomon heat pumps and Sunamp's UniQ heat batteries. The two companies signed a memo of understanding earlier this year to develop the new product.

Elsevier, the world’s largest publisher of research papers, has cut off access by University of California faculty, staff and students to articles published since Jan. 1 in 2,500 Elsevier journals. UC, which paid $11 million for Elsevier subscriptions last year, ended its subscription deal with the publisher in February in a dispute over increasing fees and the principle of free access to scholarly work.  

Sonoco ThermoSafe Europe, Hemel Hempstead, United Kingdom, posted openings this month for a sales manager and a lab engineer.

• Researchers at Sweden's Chalmers University of Technology have developed a window film with a specially designed molecule that can capture energy from the sun’s rays and release it later as heat.  

• Nominations are open for the American Oil Chemists' Society's 2020 Society and Scientific Awards. Among the seven awards are the Award of Merit, which recognizes a AOCS member with a history of outstanding service to the society, and the Young Scientist Research Award, which recognizes research contributions in one of the areas represented by an AOCS division. The deadline for submitting nominations is Aug. 1.   

Patent application: Battery module, battery pack module and vehicle including battery pack

Ben Welter - Thursday, July 18, 2019

LG Chem battery module drawingU.S. patent application 20190221901 (applicant LG Chem Ltd., Seoul, South Korea):

"A battery module includes a plurality of battery cell assemblies, each having at least one battery cell; a bottom case configured to accommodate the plurality of battery cell assemblies; an upper case mounted to an upper side of the bottom case to expose a part of an upper side, a part of a front side and a part of a rear side of adjacent battery cell assemblies of the plurality of battery cell assemblies; and a cooling unit configured to cover the exposed parts of the adjacent battery cell assemblies and having a phase change material for cooling the adjacent battery cell assemblies."

http://www.freepatentsonline.com/20190221901.pdf

Patent application: A passive temperature control system for transport and storage containers

Ben Welter - Thursday, July 18, 2019

U.S. patent application 20190219320 (applicant Softbox Systems Ltd., Long Crendon, Great Britain):

"The present invention relates to the field of the transportation and storage of goods and to a passive temperature control system for such a transport and storage containers. The present invention seeks to provide a system that can enable goods to be securely and reliably transported and stored for limited periods within specified temperature ranges. Pharmaceuticals, proteins, biological samples and other temperature sensitive products, including food items, are regularly shipped in containers year round and are subjected to a wide range of temperatures. Though they are shipped in insulated containers and/or climate controlled environments, the temperature stability of the shipping containers can be significantly improved by utilising suitable phase change materials in an ordered fashion. The present invention provides a simple solution to the maintenance of temperature profiles for the transport and storage of temperature sensitive products."

http://www.freepatentsonline.com/20190219320.pdf

Patent application: Method for making PCM products and system therefor

Ben Welter - Thursday, July 18, 2019

U.S. patent application 20190217553 (inventor Peter Horwath, New London, N.C.):

Horwath patent drawing"A method for processing phase change material includes providing pieces of phase change material having a transition temperature, the pieces of phase change material being in a solid phase. A medium is provided which is transformable from a liquid state to a solid state, the medium is in the liquid state and at a temperature which is below the transition temperature of the pieces of phase change material. The pieces of phase change material are combined with the medium to form a mixture. The mixture is supplied to a tool which forms a phase change material product. The medium is then transformed to the solid state."

http://www.freepatentsonline.com/20190217553.pdf

Research roundup: Thermally conductive HDPE; pentaerythritol; RT44HC; epoxy resin composites; more

Ben Welter - Thursday, July 18, 2019

From Journal of Applied Polymer Science:

Thermally conductive high-density polyethylene as novel phase-change material: Application-relevant long-term stability
Reliable phase‐change polyurethane crosslinked by dynamic ionic‐bond crosslinking for thermal energy storage

From International Journal of Heat and Mass Transfer:

A molecular dynamics study of the effects of crystalline structure transition on the thermal conductivity of pentaerythritol as a solid-solid phase change material
A comparative study of the effect of varying wall heat flux on melting characteristics of phase change material RT44HC in rectangular test cells
High thermal response rate and super low supercooling degree microencapsulated phase change materials (MEPCM) developed by optimizing shell with various nanoparticles

From Materials Research Express:

Evaluation of thermophysical properties of shaped inorganic hydrated salt-based phase change materials for wall energy storage

From Construction and Building Materials:

Measurement and analysis of thermophysical parameters of the epoxy resin composites shape-stabilized phase change material
Thermal enhanced cement-lime mortars with phase change materials (PCM), lightweight aggregate and cellulose fibers

From Energy and Buildings:

Properties of concretes enhanced with phase change materials for building applications

From Hong Kong Polytechnic University:

Development of encapsulation methods for organic-based phase change materials in water

From Journal of Energy Storage:

Recent developments in the synthesis of microencapsulated and nanoencapsulated phase change materials

From Energy Conversion and Management:

Experimental and modeling study on thermal performance of hydrated salt latent heat thermal energy storage system

From Energies:

Thermal Response of Mortar Panels with Different Forms of Macro-Encapsulated Phase Change Materials: A Finite Element Study

From Renewable Energy:

Influence of the location of discrete macro-encapsulated thermal energy storage on the performance of a double pass solar plate collector system

From IOP Conference Series: Earth and Environmental Science:

Simulation and Analysis of Fuel Tank Heat Exchanger Based on Phase Change Material
Simulation Analysis of Thermal Storage Process of Phase Change Energy Storage Materials

From Nano-Structures & Nano-Objects:

Synthesis of organic phase change materials by using carbon nanotubes as filler material

From Processes:

Preparation and Performance Analysis of Graphite Additive/Paraffin Composite Phase Change Materials

From International Conference on Human-Computer Interaction:

Thermoregulating and Hydrating Microcapsules: Contributions of Textile Technology in the Design of Wearable Products for Wheelchair Dependents

From Materials Today:

Experimental study on hybrid natural circulation type solar air heater with paraffin wax based thermal storage

From Thermal Science and Engineering Progress:

Numerical and Experimental Investigation of Melting Characteristics of Phase Change Material-RT58

Glacier Tek adds flexible PCM microspheres to new line of cooling packs

Ben Welter - Monday, July 15, 2019

Glacier Tek LLC of Minneapolis has incorporated flexible PCM microspheres in the cooling packs used in its Flex Vest line of cooling vests. 

Glacier Tek's new cooling packsThe cooling packs, redesigned for improved comfort and performance, feature a soft, durable nylon shell. They reach a flexible state more quickly and feel colder than the previous packs. 

The Flex Vest is designed to maintain a comfortable microclimate of 18 degrees C for up to 2.5 hours. The new packs can be recharged in about 30 minutes in ice water or two hours in a refrigerator. But they are most effective when fully solidified in a freezer, which takes about an hour. The cooling packs weigh about 164 grams each and fit into 12 pockets inside the vest.

The novel cooling material, developed by PureTemp LLC of Minneapolis, is composed of a biobased phased change material. It is similar to the material used in the Glacier Tek therapy cooling packs introduced at the American College of Sports Medicine trade show in Orlando in May.

"PureTemp is excited to bring this shape-stabilized PCM format to the market," said Chris Servais, vice president of operations at PureTemp. "Glacier Tek has capitalized on its unique and improved characteristics.”

https://glaciertek.com/spare-flex-vest-cooling-pack-set/