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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: Article of apparel with PCM

Ben Welter - Monday, November 12, 2018

U.S. patent application 20180317574 (applicant Under Armour Inc., Baltimore, Md.):

"The present invention is directed toward an article of apparel including a base textile with a comfort regulation membrane. The comfort regulation membrane contains a plurality of system-reactive components selectively engaged heat and/or moisture. In an embodiment, the printed coating includes a cooling agent, a phase change material, and a heat dissipation material. The system reactive components may be provided in particulate form, being suspended in a binder. In operation, the article of apparel is effective to delay/diminish the rise in skin temperature (compared to a garment lacking the membrane) and/or improve the overall moisture management capacity of the substrate, either of which may improve wearer comfort."

http://www.freepatentsonline.com/20180317574.pdf

Research roundup: Heat capacities of potential organic PCMs; asphalt binders; novel smart textile; modeling hysteresis; more

Ben Welter - Tuesday, September 18, 2018

From Journal of Chemical Thermodynamics:

Heat capacities of potential organic phase change materials

From Renewable Energy:

Effects of microencapsulated phase change materials on the performance of asphalt binders
An improved, generalized effective thermal conductivity method for rapid design of high temperature shell-and-tube latent heat thermal energy storage systems
Multi-objective optimisation of thermal energy storage using phase change materials for solar air systems

From Energy:

A comprehensive study of properties of paraffin phase change materials for solar thermal energy storage and thermal management applications
Evaluation of a novel solar driven sorption cooling/heating system integrated with PCM storage compartment

From Chemical Engineering Journal:

Shape-stabilized phase change materials based on porous supports for thermal energy storage applications
Novel smart textile with phase change materials encapsulated core-sheath structure fabricated by coaxial electrospinning

From International Journal of Heat and Mass Transfer:

Experimental research on the effective heating strategies for a phase change material based power battery module
Modeling hysteresis in the phase transition of industrial-grade solid/liquid PCM for thermal energy storages

From Applied Thermal Engineering:

Determination of heat transfer coefficients in direct contact latent heat storage systems

PCM briefing: Ice Energy seeks distributors in Australia, Mexico and Saudi Arabia; Thermetrics' new manikin can measure PCM effects

Ben Welter - Friday, August 31, 2018

• In an interview with Energy Storage Report, CEO Mike Hopkins discussed Ice Energy's plans to distribute its ice-based thermal energy storage technology in Australia, Mexico and Saudi Arabia. In June, the California company announced a $40 million cash infusion from Argo Infrastructure Partners to finance the delivery of Ice Energy's residential and commercial thermal storage contracts.

Thermetrics manikin ANDIThermetrics says its new ANDI sweating thermal manikin has the "unrivaled ability" to measure both positive and negative heat flux and to respond to changing environmental conditions with "unprecedented" speed and accuracy. The new manikin was unveiled this week at the 12th International Meeting of Manikins and Modeling, hosted by the Swiss research institute Empa, in St. Gallen, Switzerland. The manikin can be used to evaluate the thermal performance of apparel, blankets and seats, as well as quantify the cool-to-touch or warm-to-touch temperature-buffering effect in fabrics containing phase change materials. 

• New from LP Information: "2018-2023 Global Eutectic Phase Change Material Consumption Market Report"

• New from Research and Markets: "Phase Change Materials (PCMs) - A Global Market Overview"

• The journal Nature reports that India is cracking down on predatory journals, publications that "actively solicit manuscripts and charge authors hefty fees without providing the services they advertise, such as editing and peer review." 

• Life science laboratories are finding creative ways to reduce the amount of plastic they throw away, The Scientist reports. 

Sonoco ThermoSafe will hold its next Leading Minds Seminar Nov. 6-7 at the Sheraton Skyline Hotel Heathrow, London, England. Co-hosted by ELPRO, the seminar is a chance for pharmaceutical manufacturers, supply chain partners and government representatives to discuss temperature-assurance packaging and data monitoring in a collaborative environment.

Viking Cold Solutions says the thermal energy storage system the company installed at a 93,000-square-foot frozen food distribution center in Richmond, Calif., has reduced peak period energy consumption by up to 43 percent and reduced overall freezer energy consumption by 35 percent. Viking installed the system at the Dreisbach Enterprises warehouse earlier this year. Plastic panels filled with a proprietary salt hydrate are installed evenly throughout the warehouse atop the existing product racks. The PCM absorbs heat as it melts, allowing chillers to run less frequently and still keep the warehouse within a few degrees of the target temperature. The system also includes intelligent controls and sensors to optimize energy use and alert managers to temperature abnormalities, equipment failure and power outages.

PCM briefing: va-Q-tec opens Uruguay office; U.S. Army issues RFQ for 'cooling radio vest'

Ben Welter - Monday, August 06, 2018

• A bipartisan bill promoting innovation in sustainable chemistry was reintroduced in the U.S. Senate last week. The bill is sponsored by Susan Collins, R-Maine, and Chris Coons, D-Del. Collins said the legislation "would create a coordinated national effort to support research and development in the sustainable chemistry field; provide grants, training, and educational opportunities for scientists and engineers; and support American jobs by maintaining our nation’s scientific leadership." 

• PCM maker va-Q-tec AG is expanding its international presence with a new Latin American head office and operations facility in Montevideo, Uruguay. The new site will function as a hub for va-Q-tec’s pharma shipper rental service.

Sener and Acciona Industrial have begun the salt melting process at the 100MW Kathu concentrated solar power plant in South Africa's Northern Cape Province. The molten salt will be used to store heat from the solar field for up to 4.5 hours. The heat can be recovered later to produce steam and generate electricity.

• In response to a U.S. threat to raise a proposed tariff rate on $200 billion worth of Chinese goods to 25 percent, China has threatened to impose tariffs on $60 billion in U.S. goods.

• The U.S. Army is seeking proposals for a "cooling radio vest" that uses phase change material to keep the wearer at a comfortable 72 degrees F. The vest must include two radio pockets, a cell phone pocket, two utility pockets and space for a hydration panel. The list of requirements also specifies: "Cooling elements are a non-gel. Non ice mil spec aluminum packet consisting of a phase change material measuring 4.5" x 2.6" x 0.3." The deadline for proposals is Aug. 13. One other detail: Just 22 units are needed. 

Patent application: Self-warming insulation

Ben Welter - Wednesday, May 30, 2018

U.S. patent application 20180142383 (applicant PrimaLoft Inc., Latham, N.Y.):

"The invention provides an insulation material that includes exothermic fibers, heat capturing fibers capable of retaining heat, and synthetic fibers. The heat capturing fibers having a density of at least 1.17 g/cm3or 2.0 Dtex linear density. Also provided are articles comprising, and methods of making the inventive insulation material. ... In some embodiments, the heat capturing fibers are selected from fibers containing ceramic, fibers containing carbon, and fibers containing phase change material (PCM)."

http://www.freepatentsonline.com/20180142383.pdf

Patent application: Articles of footwear with cooling features

Ben Welter - Monday, April 23, 2018

Under Armour patent drawingU.S. patent application 20180103714 (applicant Under Armour, Baltimore, Md.):

"The present invention is directed toward an article of footwear effective to regulate the temperature of the feet of a wearer. In an embodiment, the article of footwear includes an upper and an insole with a thermal effect membrane. The thermal effect membrane contains a plurality of system-reactive components selectively engaged heat and/or moisture. In an embodiment, the printed coating includes a cooling agent, a phase change material, and a heat dissipation material. The bottom of the sole structure of the article of footwear further includes a multiple openings in the forefoot, midfoot, and hindfoot regions. The multiple openings promote airflow into the interior of the upper. In operation, the article of footwear is effective to delay/diminish the rise in skin temperature (compared to footwear lacking the membrane and/or openings), increasing wearer comfort."

http://www.freepatentsonline.com/20180103714.pdf

Research roundup: Personal cooling device; China's cold chain; prismatic lithium ion batteries; more

Ben Welter - Friday, March 16, 2018

"Preparation and Characterization of Modified Porous Wood Flour/Lauric-Myristic Acid Eutectic Mixture as a Form-Stable Phase Change Material" [Energy & Fuels]

A novel phase based cooling system for prismatic lithium ion batteries [Institut International du Froid]

Optimization of solar photovoltaic system integrated with phase change material [Solar Energy]

A novel heat transfer enhancement technique for performance improvements in encapsulated latent heat storage system [Solar Energy]

Experimental and numerical investigation of a solar collector/storage system with composite phase change materials [Solar Energy]

Enhanced thermal conductivity of phase change material nanocomposites based on MnO2 nanowires and nanotubes for energy storage [Solar Energy Materials and Solar Cells]

Enhancing the Thermosiphon-Driven Discharge of a Latent Heat Thermal Storage System used in a Personal Cooling Device [International Journal of Refrigeration]

An Overview of Current Status of Cold Chain in China [International Journal of Refrigeration]

Applications of Thermal Analysis to the Study of Phase-Change Materials [Handbook of Thermal Analysis and Calorimetry]

Thermo-physical characteristics, mechanical performance and long-term stability of high temperature latent heat storages based on paraffin-polymer compounds [Thermochimica Acta]

High thermal conductive paraffin/calcium carbonate phase change microcapsules based composites with different carbon network [Applied Energy]

Patent application: Wearable temperature control garment system

Ben Welter - Friday, March 16, 2018

U.S. patent application 20180070659 (inventor Peng Xu, Moraga, Calif.):

"A wearable air temperature control system has two separable parts, a garment and an external heat pump, and the two parts are connected together via a connecting tube. The garment comprises an inner layer, a middle layer which is a carrier supporting the PCM capsules, and an insulating layer. The three layers is secured together to form a laminated unitary structure, which is flexible, soft and breathable. The external heat pump circulates cold or hot water through the garment when the garment is connected. The water flows in the capillary tube embedded in the PCM capsules and recharge the PCM. As a result, the garment could achieve cooling or heating by melting or freezing the PCM material inside the PCM capsules, whether the garment is separated from or connected to the heat pump for recharging. After the garment is fully recharged, the garment can be disconnected from the heat pump which allows wearers to move or work easily outdoors only wearing the portable garment."

http://www.freepatentsonline.com/20180070659.pdf

PCM briefing: PCM symposium in Würzburg; research opening at CIC Energigune

Ben Welter - Friday, March 02, 2018

• The 2nd symposium on the use of PCM in buildings will take place March 14-15 in Würzburg, Germany. It is part of the demonstration project PCM Demo II. The free event is aimed at specialists and decision makers who would like to get informed about the topic, such as architects, planners, building physicists, energy consultants, municipalities and building cooperatives. Thomas Wollheim of va-Q-tec AGThomas Haussmann of the Fraunhofer Institute for Solar Energy Systems, Felix Klinker of ZAE Bayern and Felix Pawelz of Rubitherm are among the scheduled speakers.  

Outlast Technologies of Golden, Colo., will be among the exhibitors at the International Battery Seminar & Exhibit March 27-29 in Fort Lauderdale, Fla.

Betabrand Microclimate Office WrapOutlast is using LinkedIn to showcase Outlast partners and their newest products. First up: Betabrand's Microclimate Office Wrap, a lightweight cardigan-style wrap designed to regulate body temperature "for all-day comfort." 

• The environmental group CDP reports that more than 100 cities worldwide now get the majority of their power (70 percent or more) from renewables. And a study by the International Renewable Energy Agency confirms the potential for increased use of renewable energy in Europe's heating and cooling sector.

• New from Coherent Market Insights: "Chilled Water Storage Systems by Market ... Opportunity Analysis, 2017-2025"

• New from Global Market Insights: "Phase Change Materials Market Size By Product (Paraffin, Non-Paraffin, Salt Hydrates, Eutectics) ... Competitive Market Share & Forecast, 2017-2024"

CIC Energigune, an energy research center in Spain's Basque Country, is looking to fill a post-doctoral position in its Thermal Energy Storage group. The selected candidate will focus on the development of advanced PCMs tailored for TES applications at low to medium temperatures, including solid-solid PCMs, shape-stabilized PCMs and encapsulated PCMs.   

• In an Accenture survey of 360 chemical companies in 12 countries, 80 percent of respondents said they are increasing their investments in digital technologies for plants, in particular plant management and product quality. 

• The final agenda has been released for the ARPA-E Summit in Washington, D.C., March 13-15. U.S. Energy Secretary Rick Perry is among the speakers. Also on tap: A discussion of "High Power Systems and Thermal Management Challenges in Defense" and a demonstration of an "Additively Manufactured Record High Thermal Conductivity Polymer Composite Heat Exchanger."

• Two Fraunhofer CSE projects, SunDial and Energy Storage Integration Lab, were on display Friday at the MIT Energy Conference Showcase in Cambridge, Mass. SunDial is an energy storage and distribution management system. The ESI Lab simulates a connected home of the future with a range of electric devices, including rooftop solar, energy storage, smart loads and EV charging. 

• Leaving the North American Free Trade Agreement could cost the United States $22 billion in lost chemical exports and create a tariff burden of up to $9 billion, the American Chemistry Council says.

Research roundup: Thermal protective clothing; nanosilica-enhanced PCM; active-passive ventilation wall; more

Ben Welter - Wednesday, February 28, 2018

Reversible thermochromic microencapsulated phase change materials for thermal energy storage application in thermal protective clothing [Applied Energy]

Micro encapsulated & form-stable phase change materials for high temperature thermal energy storage [Applied Energy]

Thermal performance of an active-passive ventilation wall with phase change material in solar greenhouses [Applied Energy]

A novel nanosilica-enhanced phase change material with anti-leakage and anti-volume-changes properties for battery thermal management [Energy Conversion and Management]

Synthetic Comb-Like Phase-Change Material Poly(Acrylonitrile-co-Lauric Acid) Copolymer for Low Temperature Energy Management [Materials Science Forum]

Fundamental incorporation of the density change during melting of a confined phase change material [Journal of Applied Physics]

Preliminary investigation of thermal behaviour of PCM based latent heat thermal energy storage [E3S Web of Conferences]