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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: 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]

Research roundup: Enhanced bulk-organic PCMs; cementitious composites; business clothing incorporating PCMs; more

Ben Welter - Wednesday, February 21, 2018

New formulation and characterization of enhanced bulk-organic phase change materials [Energy and Buildings]

Numerical analysis of the freeze-thaw performance of cementitious composites that contain phase change material (PCM) [Materials & Design]

Thermal Properties of Lauric Acid Filled in Carbon Nanotubes as Shape-stabilized Phase Change Materials [Physical Chemistry Chemical Physics]

Thermo-physiological comfort of business clothing incorporating phase change materials in a cold environment [International Journal of Clothing Science and Technology]

Phase change material thermal energy storage for a large scale ammonia chiller/heat pump system [International Institute of Refrigeration]

Case Study of Load Shifting Using Thermal Energy Ice Storage in Public Facilities [Journal of Facility Management]

Microencapsulated phase change materials with composite titania-polyurea (TiO2-PUA) shell [Applied Energy]

Numerical study on the effects of fins and nanoparticles in a shell and tube phase change thermal energy storage unit [Applied Energy]

Patent application: A shoe with improved thermal comfort

Ben Welter - Tuesday, February 06, 2018

U.S. patent application 20180027921 (applicant Miriade S.p.A., Nola, Italy ):

Shoe patent drawing"A shoe or boot has improved thermal comfort and comprises: an upper having, at the rear counter and the front toe end, a layer of memory foam including phase change microcapsules; an inner lining and an insole impregnated with phase change microcapsules; and a reservoir, obtained in the sole and separated from the inside of the shoe by a perforated insole part, filled up with phase change microcapsules, wherein said phase change microcapsules have a solidification temperature comprised between 18° and 23° C. and a melting temperature comprised between 24° C. and 32° C."

http://www.freepatentsonline.com/20180027921.pdf

So, which PCM product idea was phony?

Ben Welter - Monday, January 08, 2018

In 2017's final issue of Phase Change Matters, we challenged readers to identify which of these PCM product ideas was phony: an edible additive for chocolate, a feminine pad with cooling properties, a cooling pad for chickens, a thermally responsive bra and a temperature-controlled shipping container for mosquito eggs. 

It was a trick question: All five product ideas were serious inquiries submitted to Entropy Solutions in the past year. Thanks to Holger Böhme, Shaun Mann and Kosheela Poo Palam for submitting answers - and for subscribing to our newsletter. Each will receive a PureTemp temperature-control coffee tumbler.

Which PCM product idea is phony? Answer correctly for a chance to win a PureTemp mug

Ben Welter - Tuesday, January 02, 2018

PureTemp tumbler Entropy Solutions receives a dozen or so inquiries each week, most of them serious questions about PCM products, pricing and suitability for various applications. But some inquiries stretch the bounds of believability. Can you identify which of the product ideas below is fake? 

Send your answer to bwelter@puretemp.com. Five winners will be randomly selected from correct entries received by Jan. 4. The prize: a prototype coffee tumbler developed by Entropy Solutions several years ago, a product idea that was totally legit.

NOTE: You must be a Phase Change Matters subscriber to submit an entry. Representatives of organizations attending the first meeting of the PCM Industry Association of North America in October know the answer and are not eligible for this contest. Good luck to all the contestants!

Chocolate1. Mmm chocolate

We are exploring new ingredient technologies to produce a chocolate product that will release heat when it is consumed. Standard chocolate produces a minor cooling effect when it's melting in the mouth – the main fat is cocoa butter. The idea is to develop a new filling fat/oil that will release heat when consumed.

2. Premium padsWonder Woman

I represent a consumer goods company that is seeking materials that could help the feminine pad feel ‘cool’ in order to increase the comfort of use, especially when female is engaging in activities such as boxing, distance running and other extreme athletic challenges.

Chickens3. Chicken helper

I am hoping phase change materials could help solve a problem I have. First, I am completely serious. Second, here is the problem: I live in Texas and have 10 back yard laying hens. It is hot. Chickens start to go into heat stress at 85 degrees. Is it possible to enclose PCMs into a sort of pad for my chickens to rest near during the day?

Golden Girls4. Hot flashes

I am interested in using your product for a product I am developing for my design thesis. I am trying to make a responsive bra that senses a hot flash, and responds by turning on peltiers and "conducting" the cold through some sort of gel medium to the skin. Are any of your products the right thing for this?

Mosquito eggs5. Mosquito eggs

I'm wanting to ship mosquito eggs and need the parcel to stay dry, and within a prescribed temperature range of 10-35 degrees for up to three days. Would you be able to recommend a particular product of yours which could meet these requirements?

PCM briefing: Pitt professor gets $500,000 grant to study effectiveness of prosthetic liners

Ben Welter - Friday, December 22, 2017

Goeran FiedlerGoeran Fiedler, assistant professor of prosthetics and orthotics at the University of Pittsburgh, has been awarded a $500,000 grant from the U.S. Department of Defense to study temperature control liners for prosthetics. The liners use phase change material to reduce the body’s tendency to sweat. The study will follow participants over 12 months to determine whether the liners decrease the risk of pressure sores, accidental falls and other problems.

Axiom Exergy has been named to Food Logistics' FL100+ Top Software and Technology Providers list. The award recognized Axiom for its PCM-based "refrigeration battery," now in operation at a Whole Foods Market in Los Altos, Calif., and scheduled for installation at a Walmart store in San Diego.

HeatVentors has won 2017’s international PowerUp! competition for innovative energy start-ups. The Hungarian company's PCM-based thermal energy storage system is designed to cut energy use by up to 40 percent.

A thousand tons of rock will be used to store excess thermal energy in Siemens Gamesa's Future Energy System under construction in Hamburg, Germany.

• Registration is open for the Unleashing Innovation Summit 2018 to be held March 12-13 in Amsterdam. The goal of the event is to  "bring together cross-industry innovation leaders to share information on the latest trends and strategies relating to creating an ecosystem and culture of innovation within an organisation."

• The agenda has been posted for the Smart Fabrics Summit in Washington, D.C.  The April 24 event is hosted by the U.S. Department of Commerce and the Industrial Fabrics Association International. Topics include "Smart Fabrics Standards: A Government Regulator’s Perspective" and  "Trends in Public-Private R&D Partnerships on Smart Fabrics."

Maryanne Waweru-Wanyama, a Kenya-based journalist and blogger, offers a fresh take on Warmilu's IncuBlanket. The product uses packs filled with sodium acetate trihydrate to keep infants warm for up to five hours.

Research roundup: Cooling vests; palygorskite-based composites; convective solar crop dryer; more

Ben Welter - Thursday, December 21, 2017

An Optimal Two-Bout Strategy with Phase Change Material Cooling Vests to Improve Comfort in Hot Environment [Journal of Thermal Biology]

Preparation of palygorskite-based phase change composites for thermal energy storage and their applications in Trombe walls [Journal of Wuhan University of Technology]

Thermal performance of optimum thermal energy storage in natural convective solar crop dryer [Bhartiya Krishi Anusandhan Patrika]

Integrated Dispatch Model for Combined Heat and Power Plant with Phase-change Thermal Energy Storage Considering Heat Transfer Process [IEEE Transactions on Sustainable Energy]

Modeling of District Heating Networks for the Purpose of Operational Optimization with Thermal Energy Storage [Applied Thermal Engineering]

Study of Nusselt Number Evolution in PCM Shell-and-Tube Configuration [Euro-Mediterranean Conference for Environmental Integration]

Reduced-scale experiments to evaluate performance of composite building envelopes containing phase change materials [Construction and Building Materials]