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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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Research roundup: Dynamic behavior of PCM-27; Al2O3, SiO2 and TiO2 nano-inclusions; coacervation microencapsulation; more

Ben Welter - Tuesday, August 14, 2018

From International Journal of Thermal Sciences:

An experimental and a numerical analysis of the dynamic behavior of PCM-27 included inside a vertical enclosure: Application in space heating purposes

From Journal of Molecular Liquids:

Thermal conductivity enhancement in organic phase change material (phenol-water system) upon addition of Al2O3, SiO2 and TiO2 nano-inclusions

From Applied Thermal Engineering:

Experimental and numerical investigations of nano-additives enhanced paraffin in a shell-and-tube heat exchanger: A comparative study
Three-dimensional numerical and experimental investigation of the behavior of solar salts within thermal storage devices during phase change

From Energy Conversion and Management:

Formulation of a model predictive control algorithm to enhance the performance of a latent heat solar thermal system
Performance assessment of a new hydrogen cooled prismatic battery pack arrangement for hydrogen hybrid electric vehicles

From Carbohydrate Polymers:

Chitosan composite microencapsulated comb-like polymeric phase change material via coacervation microencapsulation

From Renewable Energy:

Analytical Considerations on Optimization of Cascaded Heat Transfer Process for Thermal Storage System with Principles of Thermodynamics

From Proceedings of Microscopy & Microanalysis 2018:

In-Situ TEM Observation of Crystallization in Phase-Change Material

From International Journal of Energy Research:

Research roundup: Octadecanol/expanded perlite; PV/T system design; macroencapsulated PCM for pavement; more

Ben Welter - Friday, August 10, 2018

From Renewable Energy:

Experimental investigation on thermal properties and thermal performance enhancement of octadecanol/expanded perlite form stable phase change materials for efficient thermal energy storage
Effect of graphite mass concentrations in a mixture of graphite nanoparticles and paraffin wax as hybrid storage materials on performances of solar still

From Renewable and Sustainable Energy Reviews:

A review on recent development for the design and packaging of hybrid photovoltaic/thermal (PV/T) solar systems

From Materials:

Mechanical and Thermal Performance of Macro-Encapsulated Phase Change Materials for Pavement Application

From International Journal of Heat and Mass Transfer:

Heat transfer behavior of elemental sulfur for low temperature thermal energy storage applications
A novel method for determining the melting point, fusion latent heat, specific heat capacity and thermal conductivity of phase change materials
Effect of microstructure on melting in metal-foam/paraffin composite phase change materials

From Chemical Engineering Journal:

Flexible phase change materials for thermal storage and temperature control

From Construction and Building Materials:

Experimental investigation of thermal and mechanical properties of magnesium oxychloride cement with form-stable phase change material

From Solar Energy:

New insights into the corrosion mechanism between molten nitrate salts and ceramic materials for packed bed thermocline systems: A case study for steel slag and solar salt


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. 

Research roundup: Solar thermal modeling; finned multitube storage; solid-solid PCM: more

Ben Welter - Wednesday, August 01, 2018

From Applied Thermal Engineering:

Modelling and experimental study of latent heat thermal energy storage with encapsulated PCMs for solar thermal applications

From Journal of Energy Storage:

Estimation of thermal performance and design optimization of finned multitube latent heat thermal energy storage

From Engineering Science and Technology:

Experimental study on heat transfer performance of neopentyl glycol/CuO composite solid-solid PCM in TES based heat sink

From Solar Energy:

Synthesis and characterization of stearic acid/silicon dioxide nanoencapsules for solar energy storage

PCM briefing: PureTemp blog is finalist for industry award; ACC urges Trump to remove all chemicals from tariffs list

Ben Welter - Friday, July 27, 2018

• The Phase Change Matters blog is a finalist in the 2018 PR News Platinum and Agency Elite Awards. Other finalists in the blog category include Shopfloor (National Association of Manufacturers), The Blonde Abroad (R&R Partners) and Transform (Microsoft Inc.). Winners will be announced at a luncheon in New York City on Sept. 21.

Phase Change Material Products Ltd. and Fraunhofer Institute for Solar Energy Systems ISE will be among the exhibitors at Chillventa 2018. The trade show for refrigeration, air conditioning, ventilation and heat pumps will be held Oct. 16-18 in Nuremberg, Germany. 

FLIR One Pro LTFlir Systems has released the One Pro LT thermal image camera for the iPhone. The new model has many of the core features of the popular One Pro model but at a lower price: $299.

Ed Brzytwa, the American Chemistry Council's director of international trade, has urged the Trump administration to remove all chemicals and plastics products, valued at $2.2 billion, from a list of Chinese goods subject to possible increased tariffs. In testimony before officials from the Office of the U.S. Trade Representative this week, Brzytwa said higher tariffs on those products “has the potential to harm America’s manufacturing renaissance and is counterproductive to U.S. economic interests.” 

• The program for the 13th Conference on Advanced Building Skins has been posted. The event will be held Oct. 1-2 in Bern, Switzerland. Last year's conference included at least 10 presentations on phase change material. "Phase change" appears just twice in this year's program. A presentation by Jose Manuel Montes Donaire of AKT II Envelopes, London, "Thermal tuning of envelopes and its use as a parametric design tool," will address the topic of energy buffering with phase change materials. A presentation by Annie Shaw of Manchester School of Art on the architectural potential of knitted textiles will explore "three-dimensional seamlessness and stretch, phase-change form-finding and form-fixing."

• Pillow talk: Phase change material is no longer enough. Manufacturers like Tulo and Blu Sleep are turning to titanium particles and essential oils in an effort to stand out it in the crowded pillow market.

Pelican BioThermal's newest temperature-control bulk shipper, the CoolPall Flex, is now available for purchase. The CoolPall Flex, unveiled in Milan in March, has a capacity range of 140 to 767 liters. Options include standard insulation or vacuum insulated panels and water-based or PCM coolants in single or double coolant configurations.

Sonoco ThermoSafe and United Cargo announced a global partnership agreement for the leasing of the PharmaPort 360 temperature-controlled bulk shipping container. The agreement enables pharmaceutical shippers to lease PharmaPort 360 containers directly from United Cargo.

Research roundup: Silicon carbide for battery thermal management; Stefan moving boundary models; alkali nitrate/nitrite salts; more

Ben Welter - Tuesday, July 24, 2018

From Renewable Energy:

Using Renewables Coupled with Thermal Energy Storage to Reduce Natural Gas Consumption in Higher Temperature Commercial/Industrial Applications

From Solar Energy:

Development of a solar thermal storage cum cooking device using salt hydrate

From Applied Energy:

One-step fabrication of fatty acids/nano copper/polyester shape-stable composite phase change material for thermal energy management and storage
Palmitic acid/polyvinyl butyral/expanded graphite composites as form-stable phase change materials for solar thermal energy storage

From Chinese Journal of Chemical Engineering:

Preparation and phase change performance of Na2HPO4·12H2O@poly(lactic acid) capsules for thermal energy storage

From Applied Thermal Engineering:

Thermal performance of sodium acetate trihydrate based composite phase change material for thermal energy storage
Performance improvement and energy consumption reduction in refrigeration systems using phase change material (PCM)
A thermal conductive composite phase change material with enhanced volume resistivity by introducing silicon carbide for battery thermal management
Numerical and Experimental study on the performance of a new two -layered high-temperature packed-bed thermal energy storage system with changed-diameter macro-encapsulation capsule

From Colloids and Surfaces A: Physicochemical and Engineering Aspects:

Green Nano-encapsulation Technique for Preparation of Phase Change Nanofibers Mats with Core-Sheath Structure
From International Journal of Thermal Sciences:

Analytical and numerical analysis of PCM solidification inside a rectangular finned container with time-dependent boundary condition

From Construction and Building Materials:

Elaboration and properties of a composite bio-based PCM for an application in building envelopes

From International Journal of Heat and Mass Transfer:

Lorentz forces effect on NEPCM heat transfer during solidification in a porous energy storage system
A translucent honeycomb solar collector and thermal storage module for building façades

PCM briefing: Brookins confirmed as Alexium CEO; palmitic acid, stearic acid on U.S. tariff list

Ben Welter - Monday, July 16, 2018

Dr. Robert BrookinsAlexium International has appointed Dr. Robert Brookins, right, as chief executive officer and managing director of the company. Brookins, formerly executive vice president of research and development, was appointed interim CEO in May, replacing Dirk Van Hyning, who resigned for personal reasons. Alexium, based in Greer, S.C., and Perth, Australia, makes flame-retardant and PCM-enhanced fabric treatments.

Palmitic acid, stearic acid and their salts and esters are on a list of more than 6,000 items on which the United States may impose additional import tariffs in its escalating trade war with China.

Two top executives at Wilmar International have stepped down after Greenpeace published a report linking the world's largest palm oil trading company to a supplier accused of deforestation.

Active Energy Systems, a clean-tech startup in Tennessee, is developing an electro-thermal energy storage system that will use waste heat generated by data centers, industrial complexes, institutions and power plants to store and distribute energy more efficiently and cheaply than systems using conventional batteries. "Using power from the grid at off-peak times," Venture Nashville Connections reports, "the process transforms water into ice -- spraying it through an oil layer, which allows the water to freeze but not stick to a submerged heat exchanger. Instead, it forms pellets resembling Dippin' Dots ice cream, [co-founder Mitch] Ishmael said. Then the cycle operates in reverse, using waste heat to melt the ice and generate electricity back to the grid."

• New from Research Mentor:" Global Phase Change Material (PCM) Market will be Worth USD 770.1 Million by 2023"

• New from Questale: "Global Eutectic Phase Change Material Market Research Report 2018"

• "What are some new trends in solar energy research and development in 2018?" a Quora member asked recently. Three answers were posted. The one provided by Yogi Goswami, director of the University of South Florida's Clean Energy Research Center, got more than 120 "upvotes" and was picked up by Forbes magazine. Goswami discussed the strengths and weaknesses of two competing technologies: photovoltaics and concentrating solar power. He expressed confidence that CSP will eventually become commercially competitive because it has two big advantages over PV: "It uses the same thermal power conversion as the conventional thermal power (fossil fuel or nuclear based) and can therefore be integrated with the existing power infra-structure easily" and it "uses thermal energy storage which is about one-tenth the cost of battery storage."

Research roundup: Novel graphite-PCM composite sphere; sunlight-driven energy conversion; PCM-rich concrete overlay; more

Ben Welter - Tuesday, July 10, 2018

From Applied Thermal Engineering:

A Novel Graphite-PCM Composite Sphere With Enhanced Thermo-Physical Properties
Fatty acids based eutectic phase change system for thermal energy storage applications

From Applied Energy:

Mathematical modeling and sensitivity analysis of solar photovoltaic panel integrated with phase change material
Compact liquid cooling strategy with phase change materials for Li-ion batteries optimized using response surface methodology
Multi-parameter optimization design of thermoelectric harvester based on phase change material for space generation

From Solar Energy:

Experimental study on the performance of a novel solar water heating system with and without PCM
Latent thermal energy storage for solar process heat applications at medium-high temperatures – A review
Carbon based material included-shaped stabilized phase change materials for sunlight-driven energy conversion and storage: An extensive review

From Construction and Building Materials:

Application of a PCM-rich concrete overlay to control thermal induced curling stresses in concrete pavements

From Energy Conversion and Management:

Energy investigation of glazed windows containing Nano-PCM in different seasons
Transforming a passive house into a net-zero energy house: a case study in the Pacific Northwest of the U.S.

Research roundup: Humidity control material; solar water heaters; nanomaterials; flow-through wall elements; more

Ben Welter - Monday, July 09, 2018

From Energy and Buildings:

A Review on Enhancement of Phase Change Materials - A Nanomaterials Perspective
Phase change humidity control material and its impact on building energy consumption

From Solar Energy:

Optimization of melting and solidification processes of PCM: Application to integrated collector storage solar water heaters

From Applied Thermal Engineering:

Experimental Investigation on the Heat Transfer Enhancement in a Novel Latent Heat Thermal Storage Equipment
Recent advancements on thermal management and evaluation for data centers
Heat Transfer Characteristics of an Expanded Graphite/Paraffin PCM-Heat Exchanger used in an Instantaneous Heat Pump Water Heater

From Thermal Science and Engineering Progress:

Numerical simulation of the melting of a NePCM due to a heated thin plate with different positions in a square enclosure

From Journal of Building Engineering:

Numerical study of flow-through wall elements with phase–change materials

From Journal of Energy Storage:

Exploratory investigation of a new thermal energy storage system with different phase change materials having distinct melting temperatures

From Renewable Energy:

Optimization assessment of the energy performance of a BIPV/T-PCM system using Genetic Algorithms

From Sustainable Cities and Society:

Coupled cooling method and application of latent heat thermal energy storage combined with pre-cooling of envelope: Temperature control using phase-change chair

Patent application: Maintaining a solar power module

Ben Welter - Monday, July 09, 2018

U.S. patent application 20180191295 (applicant Saudi Arabian Oil Co., Dhahran, Saudi Arabia):

"A solar power system includes a plurality of solar power cells mounted on an outer surface of a spherical frame, the spherical frame including an inner surface that defines an interior volume; a heat sink that includes a hollow housing mounted within the interior volume of the spherical frame; and a phase change material positioned in the hollow housing of the heat sink, the phase change material thermally coupled to the inner surface of the spherical frame to receive heat from the outer surface of the spherical frame."

http://www.freepatentsonline.com/20180191295.pdf