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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.

Two Entropy advisors, Dr. Mohammed Farid and Lucas B. Hyman, are pleased to take your questions about PCMs and thermal energy storage. Send your questions to bwelter@puretemp.com. We'll select the best and post the answers here each week.

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Research roundup: Transient energy storage; metal alloys for high-temperature applications; low-cost PCM emulsion; more

Ben Welter - Wednesday, July 12, 2017

Transient thermal energy storage in partitioned enclosures packed with microencapsulated phase change materials [International Communications in Heat and Mass Transfer]

Considerations for the use of metal alloys as phase change materials for high temperature applications [Solar Energy Materials and Solar Cells]

Experimental analysis of a coiled stirred tank containing a low cost PCM emulsion as a thermal energy storage system [Energy]

Fabrication and characterization of novel shape-stabilized synergistic phase change materials based on PHDA/GO composites [Energy]

Fabrication of hard-shell microcapsules containing inorganic materials [International Journal of Refrigeration]

Renewable Energy and Energy Storage Systems [Energy]

Thermal Storage Capacity and Night Ventilation Performance of a Solar Chimney Combined with Different PCMs [International Journal of Photoenergy]

Preparation and characterizations of asphalt/lauric acid blends phase change materials for potential building materials [Construction and Building Materials]

Numerically Study the Performance of An Air—multiple PCMs unit for Free Cooling and Ventilation [Energy and Buildings]

Research roundup: Macro-packed fatty acid ester composites; selective laser sintering; more

Ben Welter - Tuesday, July 11, 2017

From Journal of Industrial and Engineering Chemistry:

Performance evaluation of macro-packed fatty acid ester composites using energy-efficient thermal storage systems

From Procedia Manufacturing:

Selective Laser Sintering of Phase Change Materials for Thermal Energy Storage Applications

From Applied Energy:

Synthesis and characterization of microencapsulated myristic acid–palmitic acid eutectic mixture as phase change material for thermal energy storage
Advances in thermal energy storage materials and their applications towards zero energy buildings: A critical review

From Solar Energy Materials and Solar Cells:

A new strategy for enhanced latent heat energy storage with microencapsulated phase change material saturated in metal foam
Preparation and characterization of hybrid nanocomposite embedded organic methyl ester as phase change material

From Renewable Energy:

Cutting copper fiber/paraffin composite phase change material discharging experimental study based on heat dissipation capability of Li-ion battery

From Lehigh University:

Numerical and Experimental Study of the Melting Process of a Phase Change Material in a Partically Filled Spherical Shell [thesis]

From IEEE Internet Computing:

Thermal Time Shifting: Decreasing Datacenter Cooling Costs with Phase Change Materials

From International Journal of Heat and Mass Transfer:

Numerical modeling of solid-liquid phase change in a closed 2D cavity with density change, elastic wall and natural convection

From Applied Thermal Engineering:

Evaluation of the suitability of different calorimetric methods to determine the enthalpy-temperature curve of granular PCM composites
Heat Transfer Enhancement during Freezing Process of Nano Phase Change Material (NPCM) In a Spherical Capsule
Numerical simulation on thermal characteristics of supercooled salt hydrate PCM for energy storage: Multiphase model

Research roundup: Graphite particle fillers; sodium nitrate microcapsules; domestic space heating in UK; more

Ben Welter - Tuesday, June 27, 2017

Effect of temperature and graphite particle fillers on thermal conductivity and viscosity of phase change material n-eicosane [International Journal of Heat and Mass Transfer]

Thermal stability of sodium nitrate microcapsules for high-temperature thermal energy storage [Solar Energy Materials and Solar Cells]

Phase change materials to meet domestic space heating demand in the UK - A numerical study [Journal of Fluid Flow, Heat and Mass Transfer]

Synthesis of three-dimensional graphene aerogel encapsulating n-octadecane for enhancing phase-change behavior and thermal conductivity [Journal of Materials Chemistry A]

A recyclable thermochromic elastic phase change oleogel for cold compress therapy [Applied Thermal Engineering]

Research roundup: Mid-temperature solar collector; PCM use in NZEB buildings; modeling of nitrate materials; more

Ben Welter - Friday, June 23, 2017

Experimental investigation and theoretical analysis on a mid-temperature solar collector/storage system with composite PCM [Applied Thermal Engineering]

Experimental and computational study of melting phase-change material in a triplex tube heat exchanger with longitudinal/triangular fins [Solar Energy]

Thermodynamic modeling of nitrate materials for hybrid thermal energy storage: Using latent and sensible mechanisms [Solar Energy]

Outdoor Characterization of Phase Change Materials and Assessment of Their Energy Saving Potential to Reach NZEB [Buildings]

Preparation and Supercooling Modification of Salt Hydrate Phase Change Materials Based on CaCl2·2H2O/CaCl2 [Materials]

Patent application: Microencapsulation process

Ben Welter - Tuesday, June 20, 2017

U.S. patent application 20170165627 (assignee Encapsys LLC, Appleton, Wis.):

"A microencapsulation process in which wall forming materials in a dispersed phase are polymerized to form a seed microcapsule after which an initiator or catalyst in the continuous phase is initiated or activated to effect, in whole or in part, full polymerization of the wall forming material of the dispersed phase. ... Most especially the microcapsule according to the present teachings have a phase change material as the core material. Suitable phase change materials are typically known hydrocarbons that melt at a temperature of between -30° C. and 150° C."

http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.html ...

Research roundup: PCM-assisted night purge ventilation; dispersed metallic nanoparticles; crystallohydrates; more

Ben Welter - Tuesday, June 20, 2017

Nanoencapsulated crystallohydrate mixtures for advanced thermal energy storage [Journal of Materials Chemistry A]

Hexadecane-in-water emulsions as thermal-energy storage and heat transfer fluids: Connections between phase-transition temperature and period of hexadecane droplets dispersed in hexadecane-in-water emulsions and characteristics of surfactants [Colloids and Surfaces A: Physicochemical and Engineering Aspects]

Evaluating the Performance of American Change Phase Paraffin Cooling Vest and Iranian Spadana Gel Ice Cooling Vest on the Perceptual and Physiological Strain Score Index in Hot and Humid Working Conditions of Assaluyeh in Iran [International Journal of Occupational Hygiene]

Development of thermal enhanced n-octadecane/porous nano carbon-based materials using 3-step filtered vacuum impregnation method [Thermochimica Acta]

The impact of phase change materials assisted night purge ventilation on the indoor thermal conditions of office buildings in hot-arid climates [Energy and Buildings]

Thermal energy harvest in the discharge of CO2 semi-clathrate hydrate in an emulated cold storage system [Applied Thermal Engineering]

Melting dynamics of a phase change material (PCM) with dispersed metallic nanoparticles using transport coefficients from empirical and mean field models [Applied Thermal Engineering]

Comparative assessment of thermal comfort with insulation and phase change materials utilizations in building roofs and walls [pdf] [Advanced Materials Proceedings]

Fabrication and properties of graphene oxide-grafted-poly(hexadecyl acrylate) as a solid-solid phase change material [Composites Science and Technology]

Research roundup: Shape-stabilized PCM in epoxy matrix; myristyl alcohol/metal foam for solar thermal storage; more

Ben Welter - Thursday, June 01, 2017

Illustration of shape-stabilized PCM in epoxy matrix

Novel shape stabilized phase change material based on epoxy matrix with ultrahigh cycle life for thermal energy storage [Applied Thermal Engineering]

Thermal and electrical performance of a PV module integrated with double layers of water-saturated MEPCM [Applied Thermal Engineering]

Investigation on thermal and mechanical characteristics of concrete mixed with shape stabilized phase change material for mix design [Construction and Building Materials]

Thermal properties and thermal conductivity enhancement of composite phase change materials using myristyl alcohol/metal foam for solar thermal storage [Solar Energy Materials and Solar Cells]

Experimental and Numerical Study on Energy Performance of Buildings Integrated with Phase Change Materials [Energy Procedia]

Evaluation on Performance of a Phase Change Material Based Cold Storage House [Energy Procedia]

Using Phase Change Materials to Reduce Overheating Issues in UK Residential Buildings [Energy Procedia]

Effect of Supercooling on the Solidification Process of the Phase Change Material [Energy Procedia]

Experimental Investigation of a Spiral Tube Embedded Latent Thermal Energy Storage Tank Using Paraffin as PCM [Energy Procedia]

Investigation of specific heat and latent heat enhancement in hydrate salt based TiO2 nanofluid phase change material [Applied Thermal Engineering]

Modeling and investigation of high temperature phase change materials (PCM) in different storage tank configurations [Journal of Cleaner Production]

Lauric acid/modified sepiolite composite as a form-stable phase change material for thermal energy storage [Applied Clay Science]

Patent application: System for energy consumption reduction and cost savings in a building

Ben Welter - Tuesday, May 30, 2017

U.S. patent application 20170146251 (applicant Stasis Group Inc., Woodland, Calif.):

"A system for obtaining energy consumptions, savings and cost reduction in structures adapted for human habitation which includes the utilization of a plurality of mats including phase change material encapsulated within first and second layers of plastic material [3.6, above] having heat transfer capability disposed within the plenum area above a ceiling of a room within a building with the amount of phase change material contained within each mat being between 0.5 lbs. and 0.67 lbs. per square foot. ... [The] solid to liquid transition point for said phase change material is from 72° F. to 76° F. and the liquid to solid transition point for said phase change material is from 71° F. to 68° F."

http://www.freepatentsonline.com/20170146251.pdf

PCM briefing: Outlast introduces Xelerate fabric; Warmilu signs 2 distributors

Ben Welter - Friday, May 19, 2017

Drawing of Outlast Xelerate

Outlast Europe's Martin Bentz spoke with T.EVO magazine this month about the company's new Xelerate fabric. The fabric, introduced at a German trade fair earlier this year, incorporates "heat spreader" technology, a process traditionally known for cooling electronic devices. Xelerate fabric features improved thermal conductivity, Bentz said, and is suitable for home textiles, sportswear and protective gear. In an email exchange with Phase Change Matters, Bentz declined to discuss specific partners or customers.

Warmilu, maker of the IncuBlanket infant warmer, reports that is on track for $300,000 in total 2017 sales after signing two distributors for Latin America, Africa and Southeast Asia: Relief for Africa Foundation and Maternova. The IncuBlanket, which has been successfully tested in clinical trials in India, uses packs filled with sodium acetate trihydrate to keep infants warm for up to five hours. CEO Grace Hsia says the device recently cleared its first regulatory filing with Kenya's Pharmacy and Poisons Board.

Axiom Exergy has won a Gold Stevie for Energy Innovation in the 15th annual American Business Awards. Axiom's "refrigeration battery" enables supermarkets and food warehouses to store thermal energy at night when power is cheaper. The system, which uses salt-based phase change material, reduces peak power usage by up to 40 percent.

• Registration is open for IFAI's Expo 2017, set for Sept. 27-29 in New Orleans. The Industrial Fabrics Association International show will feature sessions on smart fabrics, military procurement, biomimesis and green certification.   

Pelican BioThermal has introduced a new Series 22 Universal system for its Credo brand of shippers. The system uses a dual PCM coolant system designed to be operational throughout the year.

National Law Review offers a fresh overview of green chemistry laws across the United States. "State chemical control regimes," the authors conclude, "are likely to increase cost and foster confusion about chemical safety, which is one reason that Congress agreed to modernize TSCA by adopting LCSA."

Monodraught's Cool-phase ventilation and cooling system was among the finalists honored at the National CSR Awards in London this week. The hybrid system, which won a "One to Watch" award, uses PCMs to store and release thermal energy, providing a free cooling load and reducing energy and maintenance costs.

• The agenda has been released for the 15th Cold Chain Global Forum to be held Sept. 25-29 in Chicago. Frank Butch, director of engineering at Sonoco ThermoSafe, will lead a master class on temperature assurance packaging certification.

Bloomberg BNA is offering a free webinar June 12: "Reviewing New Chemicals under Amended TSCA: Impact on Innovation." 

Outlast Europe's Martin Bentz spoke with T.EVO magazine this month about the company's new Xelerate fabric (shown below). The fabric, introduced at a German trade fair earlier this year, incorporates "heat spreader" technology, a process traditionally known for cooling electronic devices. Xelerate fabric features improved thermal conductivity, Bentz said, and is suitable for home textiles, sportswear and protective gear. In an email exchange with Phase Change Matters, Bentz declined to discuss specific partners or customers.

Research roundup: Crystallization of salt hydrates in polymeric foam; Glauber's salt; cetyl alcohol/HDPE composites; more

Ben Welter - Thursday, May 18, 2017

Numerical study on melt fraction during melting of phase change material inside a sphere [International Journal of Hydrogen Energy]

Crystallization of inorganic salt hydrates in polymeric foam for thermal energy storage application [Journal of Energy Storage]

Evaluating the passive and free cooling application methods of phase change materials in residential buildings: A comparative study [Energy and Buildings]

Microstructure and thermal properties of cetyl alcohol/high density polyethylene composite phase change materials with carbon fiber as shape-stabilized thermal storage materials [Applied Energy]

Screening alternatives for producing paraffinic phase change materials for thermal energy storage in buildings [International Journal of Energy Research]

Various Applications of Phase Change Materials: Thermal Energy Storing Materials [pdf] [International Journal of Emerging Research in Management]

Preparation and thermal properties of Glauber’s salt-based phase-change materials for Qinghai–Tibet Plateau solar greenhouses [International Journal of Modern Physics B]

Numerical analysis on the energy storage efficiency of phase change material embedded in finned metal foam with graded porosity [Applied Thermal Engineering]

Passive cooling potential in buildings under various climatic conditions in India [Renewable and Sustainable Energy Reviews]