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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: 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: Polystyrene microcapsules; vermiculite composites; topology optimization; more

Ben Welter - Friday, June 16, 2017

Polystyrene Microcapsules with Palmitic-Capric Acid Eutectic Mixture as Building Thermal Energy Storage Materials [Energy and Buildings]

Preparation and characterization of capric-palmitic-stearic acid ternary eutectic mixture/expanded vermiculite composites as form-stabilized thermal energy storage materials [Journal of Materials Science and Technology]

Topology optimization for heat transfer enhancement in Latent Heat Thermal Energy Storage [International Journal of Heat and Mass Transfer]

Investigating thermal properties of using nano-tubular ZnO powder in paraffin as phase change material composite for thermal energy storage [Composites Part B: Engineering]

Research roundup: Cool roof system; inorganic double salt hydrates; optimizing energy performance in buildings; more

Ben Welter - Monday, June 12, 2017

From International Journal of Refrigeration:

Experimental phase diagram of the dodecane-tridecane system as phase change material in cold storage

From Building and Environment:

Effect of PCM cool roof system on the reduction in urban heat island phenomenon

From Solar Energy Materials and Solar Cells:

Two components based polyethylene glycol/thermosetting solid-solid phase change material composites as novel form stable phase change materials for flexible thermal energy storage application
Corrosion of steel alloys in eutectic NaCl+Na2CO3 at 700 °C and Li2CO3 + K2CO3 + Na2CO3 at 450 °C for thermal energy storage
Characterization of wastes based on inorganic double salt hydrates as potential thermal energy storage materials

From Renewable and Sustainable Energy Reviews:

Passive cooling of buildings with phase change materials using whole-building energy simulation tools: A review

From Energy:

Design optimization method for tube and fin latent heat thermal energy storage systems

From Applied Energy:

Simulation-based optimization of PCM melting temperature to improve the energy performance in buildings

From Energy and Buildings:

Energy assessment of a novel dynamic PCMs based solar shading: results from an experimental campaign

From Applied Thermal Engineering:

Improving Thermal Characteristics and Stability of Phase Change Material Containing TiO2 Nanoparticles after Thermal Cycles for Energy Storage

PCM wood flooring concept is finalist for Schweighofer Prize

Ben Welter - Friday, June 09, 2017

A Canadian Ph.D. student who wants to develop PCM-enhanced engineered wood flooring is one of six finalists for the 2017 Schweighofer Prize Student Award. 

Damien Mathis of Laval University in Quebec proposes flooring with a layer of solid-solid PCMs, which would allow the boards to be cut and installed without the risk of leakage associated with solid-liquid PCMs. He envisions a product with four times the thermal mass of standard EWF.

"I'm planning to use new solid-solid PCMs that are currently in development," he said in an interview. "It's nonflammable white powder with a PC enthalpy of ~100 J/g."

The Schweighofer Prize recognizes innovative ideas, technologies, products and services aimed at strengthening Europe's wood products industry. The winner in the student category, which will be determined in part by online voting, will be honored at an awards ceremony June 20 in Vienna. A prize of 5,000 euros accompanies the award.  

https://www.schweighofer-prize.org/student_award/?lang=EN

Research roundup: Stearic acid and modified expanded vermiculite; D-mannitol; acrylic-based microcapsules; more

Ben Welter - Saturday, May 27, 2017

From Renewable Energy:

Shape-stabilized composite phase change materials with high thermal conductivity based on stearic acid and modified expanded vermiculite

From AIMS Energy:

Feasibility study of D-mannitol as phase change material for thermal storage

From Thermal Science and Engineering Progress:

Computer simulations of heat transfer in a building integrated heat storage unit made of PCM composite

From European Polymer Journal:

Preparation of acrylic based microcapsules using different reaction conditions for thermo-regulating textiles production

From Energy Procedia:

Design of Experimental Investigation about the Effects of Flow Rate and PCM Placement on Thermal Accumulation

From Solar Energy Materials and Solar Cells:

A eutectic salt high temperature phase change material: Thermal stability and corrosion of SS316 with respect to thermal cycling
Novel form-stable phase change material composite for high-efficiency room temperature control

From Applied Thermal Engineering:

Thermal Energy Storage System Operating with Phase Change Materials for Solar Water Heating Applications: DOE Modelling

From Procedia Engineering:

A Comparative Study on the Effectiveness of Passive and Free Cooling Application Methods of Phase Change Materials for Energy Efficient Retrofitting in Residential Buildings
Thermal Energy Storage Enhancement of Lightweight Cement Mortars with the Application of Phase Change Materials

From Renewable and Sustainable Energy Reviews:

Thermal energy storage systems for concentrated solar power plants

From Construction and Building Materials:

The effect of low temperature phase change material of hydrated salt on the performance of magnesium phosphate cement

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]

Research roundup: Hydrogen-based PCM micro engine; PV module temperature stabilization; more

Ben Welter - Wednesday, May 10, 2017

A new hydrogen-based phase change material open-cycle micro engine [International Journal of Hydrogen Energy]

Photovoltaic module temperature stabilization with the use of phase change materials [Solar Energy]

A review of salt hydrates for seasonal heat storage in domestic applications [Applied Energy]

Shape-stabilized composite phase change materials with high thermal conductivity based on stearic acid and modified expanded vermiculite [Renewable Energy]

Experimental investigation of a latent heat storage for solar cooling applications [Applied Energy]

Novel CFD-based numerical schemes for conduction dominant encapsulated phase change materials (EPCM) with temperature hysteresis for thermal energy storage applications [Energy]

Performance evaluation of a novel solar photovoltaic–thermal collector with dual channel using microencapsulated phase change slurry as cooling fluid [Energy Conversion and Management]

Research roundup: Expanded graphite/adipic acid composite PCMs; nanomagnetite enhanced paraffin; more

Ben Welter - Friday, April 28, 2017

From Journal of Thermal Analysis and Calorimetry:

Preparation and thermal cycling of expanded graphite/adipic acid composite phase change materials

From RSC Advances:

Phase change materials of fatty amine-modified silicate clays of nano layered structures
Myristic acid-hybridized diatomite composite as a shape-stabilized phase change material for thermal energy storage

From 4th Sustainable Thermal Energy Management International Conference:

Domestic thermal storage requirements for heat demand flexibility

From Smart Materials and Nondestructive Evaluation for Energy Systems:

Novel dynamic thermal characterization of multifunctional concretes with microencapsulated phase change materials

From Digest Journal of Nanomaterials and Biostructures:

Nanomagnetite Enhanced Paraffin for Thermal Energy Storage Applications [pdf]

From Energy Procedia:

Solar Thermal Energy with Molten-salt Storage for Residential Heating Application

From Solar Energy:

Performance study and analysis of an inclined concentrated photovoltaic-phase change material system

From Energy:

Preparation, thermal properties and thermal reliability of a novel mid-temperature composite phase change material for energy conservation

From Applied Thermal Engineering:

Investigation on the thermal performance of a high-temperature latent heat storage system

From Cement and Concrete Composites:

Numerical simulations to quantify the influence of Phase Change Materials (PCMs) on the early- and later-age thermal response of concrete pavements

From International Journal of Refrigeration:

Performance study on air-cooled household refrigerator with cold storage phase change materials

From Energy and Buildings:

Novel thermosetting phase change materials with polycarbonatediol based curing agent as supporting skeleton for thermal energy storage 

From Journal of Cleaner Production:

Improving thermal response of lightweight timber building envelopes during cooling season in three European locations 

Research roundup: Waste heat extraction; thermal sintering Pickering emulsion-based colloidosomes; more

Ben Welter - Tuesday, April 18, 2017

Micro-encapsulated phase change material (MPCM) slurries: Characterization and building applications [Renewable and Sustainable Energy Reviews]

Coupling waste heat extraction by phase change materials with superheated steam generation in the steel industry [Energy]

Large-scale high-temperature solar energy storage using natural minerals [Solar Energy Materials and Solar Cells]

Hierarchical nano-activated silica nanosheets for thermal energy storage [Solar Energy Materials and Solar Cells]

Microencapsulation through thermal sintering Pickering emulsion-based colloidosomes [Soft Matter]

Preparation of polyurea microcapsules containing phase change materials in a rotating packed bed [RSC Advances]

Dynamic measurement of the thermal conductivity of phase change materials in the liquid phase near the melting point [International Journal of Heat and Mass Transfer]

Investigation of Energy Performance in Conventional and Lightweight Building Components with the use of Phase Change Materials (PCMS): Energy Savings in Summer Season [Procedia Environmental Sciences]

Novel synthesis of cobalt/poly vinyl alcohol/gamma alumina nanocomposite for catalytic application [Applied Physics A]

Research roundup: Solar PCM storage wall system; novel caprylic acid/nonanoic acid mix; double glazing units; more

Ben Welter - Monday, April 17, 2017

Experimental study of a modified solar phase change material storage wall system [Energy]

A novel binary mixture of caprylic acid/nonanoic acid as latent heat storage for air conditioning and cooling [Energy and Buildings]

A General Method for Retrieving Thermal Deformation Properties of Microencapsulated Phase Change Materials or Other Particulate Inclusions in Cementitious Composites [Materials and Design]

Effect of PCM thickness and melting temperature on thermal performance of double glazing units [Journal of Building Engineering]