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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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Outlast's new acrylic fiber uses unencapsulated phase change material

Ben Welter - Monday, May 11, 2015

Outlast President Martin BentzOutlast Technologies and Thai Acrylic Fibre have developed a new acrylic fiber using unencapsulated phase change material.

Outlast says the new fiber performs four times better than the existing version in regulating temperature in apparel and blankets. 

“We are using now a non-encapsulated pPCM system and we no longer work with encapsulated mPCMs here,” explained Martin Bentz, president of the Golden, Colo., company. “This change allowed us to improve the performance of the new Outlast acrylic fibers enormously. With that, the spinning and dyeing properties are enhanced.” 

Research roundup: Solar TES in residential buildings; smart food packaging; expanded metal mesh; more

Ben Welter - Wednesday, May 06, 2015

Phase change materials for solar thermal energy storage in residential buildings in cold climate [Renewable and Sustainable Energy Reviews]

Development of Polystyrene-based Films with Temperature Buffering Capacity for Smart Food Packaging [Journal of Food Engineering]

Melting of phase change material assisted by expanded metal mesh [Applied Thermal Engineering]

Lattice Boltzmann simulation of convection melting in complex heat storage systems filled with phase change materials [Applied Thermal Engineering]

Improving Performance of Household Refrigerators by Incorporating Phase Change Materials [International Journal of Refrigeration]

• Preparation and thermal properties of form-stable phase change materials composed of palmitic acid/polypyrrole/graphene nanoplatelets [Energy and Buildings]

Research roundup: 'Red Brick' TES; rocks as filler material; thermoelectric space cooling; more

Ben Welter - Monday, May 04, 2015

Preparation and thermal characterization of composite “Paraffin/Red Brick” as a novel form-stable of phase change material for thermal energy storage [International Journal of Hydrogen Energy]

Stability testing of thermal oil in direct contact with rocks used as filler material for thermal energy storage in CSP power plants [Energy Procedia]

Improving the Thermochemical Energy Storage Performance of the Mn2O3/Mn3O4 Redox Couple by the Incorporation of Iron [ChemSusChem]

Experimental and Numerical Evaluation of Longitudinally Finned Latent Heat Thermal Storage Systems [Energy and Buildings]

Facile synthesis and thermal performances of stearic acid/titania core/shell nanocapsules by sol–gel method [Energy]

Theoretical study on effective thermal conductivity of salt/expanded graphite composite material by using fractal method [Applied Thermal Engineering]

Study of a Thermoelectric Space Cooling System Integrated with Phase Change Material [Applied Thermal Energy]

Patent application: Insect repellent, fireproof thermal paint with PCM

Ben Welter - Thursday, April 30, 2015

U.S. patent application 20150111984 (inventor Alberto Vargas San Jose): "This remarkable invention provides: a vinyl-acrylic water base paint that contains encapsulated phase change materials of oleoresin from capsaicin or capsicum, derived directly from the placenta of the chili pepper. The paint also has fire-retardant properties, in one of its modes. The paint is also used to maintain the temperature of a closed enclosure, in a zone of temperature that depends on the components of phase change materials and where they can work in a range of temperatures suitable for zones of comfort and cooling areas, saving costs because of less use of air conditioning and heating equipment systems."

http://www.freepatentsonline.com/y2015/0111984.html

Research roundup: Expanded graphite with PCM; thermal cycle test; concrete with macroencapsulated PCM; more

Ben Welter - Tuesday, April 28, 2015

RT100/expand graphite composite phase change material with excellent structure stability, photo-thermal performance and good thermal reliability [Solar Energy Materials and Solar Cells]

Thermal Cycle Test of Binary Mixtures of Some Fatty Acids as Phase Change Materials For Building Applications [Energy and Buildings]

Development of structural–functional integrated concrete with macro-encapsulated PCM for thermal energy storage [Applied Energy]

Phase Change Materials—A Sustainable Way of Solar Thermal Energy Storage [pdf] [Energy Sustainability Through Green Energy]

Characterization and real-time testing of phase-change materials for solar thermal energy storage [Energy Research]

Latent Heat Thermal Storage (LHTS) for Energy Sustainability [Energy Sustainability Through Green Energy]


Research roundup: PCM shielding; stearic-acid/carbon-nanotube composites; thermal comfort in textiles

Ben Welter - Thursday, April 16, 2015

PCM-shielding of precision measuring equipment by means of latent heat [Precision Engineering]

Stearic-acid/carbon-nanotube composites with tailored shape-stabilized phase transitions and light–heat conversion for thermal energy storage [Energy Conversion and Management]

Synthesis of poly(methyl methacrylate-co-acrylic acid)/n-eicosane microcapsules for thermal comfort in textiles [Textiles Research Journal]

Research roundup: High-temperature apps; underground trench TES; cement paste; 0-D numerical model; building envelopes; PCM in buildings

Ben Welter - Tuesday, April 14, 2015

Thermal Energy Storage with Encapsulated Phase Change Materials for High Temperature Applications [Lehigh University dissertation]

Heat transfer analysis of underground thermal energy storage in shallow trenches filled with encapsulated phase change materials [Applied Thermal Engineering]

Development of Carbon Nanotube Modified Cement Paste with Microencapsulated Phase-Change Material for Structural–Functional Integrated Application [International Journal of Molecular Sciences]

Experimental validation of a 0-D numerical model for phase change thermal management systems in lithium-ion batteries [Journal of Power Sciences]

Phase Change Materials: A Prospective Solution for Surface Layers of Building Envelopes [Applied Mechanics and Materials]

Application of Phase Change Materials in Buildings [Advanced Materials Research]

Research roundup: PCM in free-moving ceiling; phase interface effects; window shutter; solar chimney; more

Ben Welter - Tuesday, April 07, 2015

Melting processes of phase change materials in an enclosure with a free-moving ceiling: An experimental and numerical study [International Journal of Heat and Mass Transfer]

Phase interface effects in the total enthalpy-based lattice Boltzmann model for solid–liquid phase change [Journal of Computational Physics]

Electroless plating of copper layer on surfaces of urea–formaldehyde microcapsule particles containing paraffin for low infrared emissivity [Particuology]

Constructal design of phase change material enclosures used for cooling electronic devices [Applied Thermal Engineering]

Numerical study of PCM solidification in a finned tube thermal storage including natural convection [Applied Thermal Engineering]

Effect of water based AL2O3 Nanoparticle PCM on cool storage performance [Applied Thermal Engineering]

Optimization of Heat Exchange in a Heat Accumulator with Latent Heat Storage [Procedia Technology]

Performance of a window shutter with phase change material under summer Mediterranean climate conditions [Applied Thermal Engineering]

Review on shell materials used in the encapsulation of phase change materials for high temperature thermal energy storage [Renewable and Sustainable Energy Reviews]

An experimental study on the thermal performance of a solar chimney without and with PCM [Renewable Energy]

Research roundup: Stability testing of high-temperature PCMs; n-octadecane in spherical capsule; modeling peak load reduction; more

Ben Welter - Friday, April 03, 2015

Determination of thermo-physical properties and stability testing of high-temperature phase change materials for CSP applications [Solar Energy Materials and Solar Cells]

The experimental exploration of sodium chloride solution on thermal behavior of phase change materials [Solar Energy Materials and Solar Cells]

Fixed-grid numerical modeling of melting and solidification using variable thermo-physical properties – Application to the melting of n-Octadecane inside a spherical capsule [International Journal of Heat and Mass Transfer]

Experimental observations on the heat transfer enhancement caused by natural convection during melting of solid–liquid phase change materials (PCMs) [Applied Energy]

Modeling Peak Load Reduction and Energy Consumption Enabled by an Integrated Thermal Energy and Water Storage System for Residential Air Conditioning Systems in Austin, Texas [Energy and Buildings]

Research roundup: PCM in building walls; chitosan-gelatin microcapsules; STES analysis; silicon carbide powder

Ben Welter - Tuesday, March 31, 2015

Thermal Energy Storage for Building: Thermodynamic and Heat Transfer
Analysis for Integration of PCMs in Building Walls
[ American Society for Engineering Education]

The Preparation and Characterization of Chitosan–Gelatin Microcapsules and Microcomposites with Fatty Acids as Thermal Energy Storage Materials [Energy Technology]

Net energy analysis of a solar combi system with Seasonal Thermal Energy Store [Applied Energy]

Preparation of Microcapsules Containing Phase Change Material and Silicon Carbide Powder with Interfacial Polycondensation Reaction Method [Materials Sciences and Applications]