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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: Solar fish dryer; oscillating heat pipe; small-scale refrigeration system; more

Ben Welter - Monday, October 22, 2018

From Applied Thermal Engineering:

Experiments on comparative performance of water thermocline storage tank with and without encapsulated paraffin wax packed bed
Experimental study and performance prediction of the PCM-antifreeze solar thermal system under cold weather conditions
Improving System Performance of a Personal Conditioning System integrated with Thermal Storage

From Energy:

A methodological concept for phase change material selection based on multi-criteria decision making (MCDM): A case study

From Journal of Energy Storage:

Experimental analysis of solar fish dryer using phase change material

From International Journal of Heat and Mass Transfer:

Experimental investigation on thermal performance of phase change material coupled with three-dimensional oscillating heat pipe (PCM/3D-OHP) for thermal management application

From Sustainable Cities and Society:

Experimental investigation on melting and solidification behaviour of erythritol in a vertical double spiral coil thermal energy storage system

From Journal of Thermal Analysis and Calorimetry:

Investigation of energy and exergy performance on a small-scale refrigeration system with PCMs inserted between coil and wall of the evaporator cabin

From Journal of Applied Physics:

Optimizing the design of composite phase change materials for high thermal power density

From Energy Procedia:

The technical and economic feasibility of utilizing phase change materials for thermal storage in district heating networks

PCM briefing: Traction battery for electric vehicles; Ember mug available in Apple stores

Ben Welter - Friday, October 19, 2018

• The Fraunhofer Institute for Structural Durability and System Reliability in Darmstadt, Germany, has developed a traction battery that can use thermal energy as a heat source in electric vehicles. A new type of fiber-reinforced composite sandwich housing protects the battery from temperature fluctuations. The phase change material composite system is designed to precondition the battery at low outside temperatures and reduce heat generation during rapid charging. The system was developed as part of the European Union's Optimized Energy Management and Use project. "We've developed material, structural and process technologies that can guarantee drivers a more reliable and uniform range for their battery-powered vehicles," said Felix Weidmann, project manager at Fraunhofer LBF.

Airec AB of Sweden has joined the EU Horizon 2020 project SWS-Heating. The project's goal is to develop seasonal thermal storage of solar energy. The energy will be stored in phase change materials. Airec will develop heat exchangers for the project. 

A process for extracting a biodegradable polymer from crustaceans is among the winners of this year's Green Chemistry Challenge Awards. The awards were formerly known as the Presidential Green Chemistry Challenge Awards. The American Chemical Society’s Green Chemistry Institute has collaborated with the U.S. Environmental Protection Agency to manage the awards since their inception in 1995. The EPA dropped out this year, citing long-term certainty about the program’s financial situation.  

Ember temperature-control tumblerEmber Technologies' temperature-control mugs are now available in Apple stores and on apple.com. The travel version right, uses phase change material to bring hot beverages down to a drinkable temperature. Earlier this year, Nordstrom began selling the mugs online and in Nordstrom popup stores.

Capstone Turbine Corp. and Argonne National Laboratory have received funding from U.S. Department of Energy to refine Argonne’s high-efficiency, fast-charging and fast-discharging thermal energy storage system for use in combined heat and power systems. The system, originally developed for use in concentrated solar power applications, will use phase change material to capture waste heat from industrial manufacturing processes. The goal is to integrate Argonne's technology into a Capstone C200 CHP system.

• New from Persistence Market Research"Global Market Study on Salt Hydrate: Pharmaceutical Industry to Remain Dominant Consumer Through 2026"

• New from QY Research: "Global Thermal Energy Storage Market Size, Status And Forecast 2025"

• New from Maia Research: "Inorganic PCMs Market Analysis, Market Size, Application, Analysis, Regional Outlook, Competitive Strategies And Forecasts, 2018 -2025"

• At the World Energy Engineering Congress in Charlotte, N.C., this week, Mark Richards of Phase Change Energy Solutions reports that the company demonstrated "a mini PhaseStor tank in action with 1/2 ton chiller and small heater (system hand made by Scott Queen) to charge and discharge the tank and includes on board DAQ system to show tank thermal performance." Richards presented at a panel discussion Friday, "Justifying HVAC Energy Savings in Buildings Using Phase Change Materials - A Debate with a Skeptical Engineer." Also presenting were Guy Frankenfield, energy division manager at DN Tanks Inc. ("Thermal Energy Storage - Uncovering the Value of Ice and Chilled Water TES Systems") and Ice Energy CEO Mike Hopkins ("Thermal Energy Storage in Package Units? Yes, it is Here").

PCM briefing: Viking Cold Solutions to install system in Mexico; Pluss reaches distribution deal with Ferro-Plast of Italy

Ben Welter - Friday, October 12, 2018

Viking Cold Solutions of Houston, Texas, has reached a deal to install its PCM-based thermal energy storage system in one of Red de Frios' frozen food warehouses in Monterrey, Mexico. Viking systems are designed to reduce energy costs by shifting peak demand to nighttime hours.

• The German Aerospace Center, the Karlsruhe Institute of Technology and the University of Stuttgart have signed an agreement to build a research facility in Germany to develop an efficient, cost-effective and "virtually loss-less" heat-based electrical storage technology. At this week's signing ceremony in Stuttgart, Stanford University Professor Robert B. Laughlin, right, 1998 Nobel Laureate in Physics, explained why he thinks heat storage will play a key role in the energy landscape of the future.

• The Conductive Plastics conference in Vienna Nov. 6-7 will include sessions on "Challenging the boundaries in thermally conductive and electrically conductive polyamides," "Boron nitride filler materials for high-performance thermal management applications," "Mineral flame retardants and metal oxides as thermally conductive fillers," "Investigating the effect of material molecular orientation on thermal conductivity of polymeric products" and "Thermally conductive materials based on synthetic rubber."

• In a LinkedIn post, Pluss Advanced Technologies of India announced it has reached a deal with Ferro-Plast Srl of Italy to distribute Pluss products in Europe.

• New from MarketResearch.biz: "Global Advanced Phase Change Material (PCM) Market Trends, Applications, Analysis, Growth, And Forecast: 2018 To 2027"

• New from Invant Research: "Global Advanced Phase Change Material (PCM) Market Study 2015-2025"

• New from Future Market Insights: "Salt Hydrate Market: Global Industry Analysis 2012 - 2016 and Opportunity Assessment; 2017 - 2027"

• New from Polaris Market Research: "Fatty Acid Esters Market, [By Product Type (Glycerol Monostearate, Medium Chain Trigylcerides, Isopropyl Esters (Myrsitate & Palmitate) and Others); By Application (Lubricants, Pharmaceuticals, Personal care & Cosmetics, Surfactants and Others); By Regions]: Market size & Forecast, 2018 – 2026"

Peli BioThermal has opened service centers in Basel and Berlin to support the company's line of Credo reusable temperature-control shippers.

• Nominations are being accepted for Metrohm USA's Young Chemist Award 2019. Entrants submit an abstract of their research for a chance to win a $10,000 cash prize and an all-expenses-paid trip to PITTCON 2019. The contest is limited to undergrad, grad, post-grad and doctoral students in the United States and Canada. Entrants must demonstrate novel research or a novel methodology using titration, ion chromatography, electrochemistry and/or spectroscopy. Applications are due by Dec. 31, 2018.

Sonoco ThermoSafe, a global provider of temperature assurance packaging in the life sciences sector, has an opening for a sales director, responsible for sales growth in North America.

• Sonoco ThermoSafe has posted the agenda for the next Leading Minds Seminar, to be held Nov. 6-7 in London. Co-hosted by ELPRO, the seminar is a chance for pharmaceutical manufacturers, supply chain partners and government representatives to discuss temperature-assurance packaging and data monitoring in a collaborative environment.

ASHRAE Learning Institute will offer 20 courses during the 2019 ASHRAE Winter Conference and AHR Expo. The conference will be held in Atlanta Jan. 12-16. Courses include "Advanced Designs for Net Zero Buildings," "Thermal Energy Storage Systems for Air Conditioning" and "Solar PV and Thermal System Analysis and Design."

Research roundup: Crude glycerol polyurethane composite foams; heat transfer analysis; Kalina cycle; more

Ben Welter - Wednesday, October 10, 2018

From Materials:

Thermal Energy Storage and Mechanical Performance of Crude Glycerol Polyurethane Composite Foams Containing Phase Change Materials and Expandable Graphite

From International Journal of Energy Research:

Review on heat transfer analysis in thermal energy storage using latent heat storage systems and phase change materials

From International Journal of Heat and Mass Transfer:

Recent developments in phase change materials for energy storage applications: A review

From Energy Conversion and Management:

Integrated power generation cycle (Kalina cycle) with auxiliary heater and PCM energy storage

From Minerals:

Mullite Stabilized Palmitic Acid as Phase Change Materials for Thermal Energy Storage

From Applied Thermal Engineering:

Microencapsulated phase change material (MEPCM) saturated in metal foam as an efficient hybrid PCM for passive thermal management: A numerical and experimental study
Inverse method to estimate air flow rate during free cooling using PCM-air heat exchanger

Research roundup: Ternary hydrated salt mixture; earth-air heat exchanger; shape-stabilized fly ash composite PCM; more

Ben Welter - Monday, October 01, 2018

From Energy Conversion and Management:

Two types of composite phase change panels containing a ternary hydrated salt mixture for use in building envelope and ventilation system
Research on cooling performance of phase change material-filled earth-air heat exchanger
An experimental investigation of the phase change process effects on the system performance for the evacuated tube solar collectors integrated with PCMs

From Solar Energy:

Carbon based material included-shaped stabilized phase change materials for sunlight-driven energy conversion and storage: An extensive review

From Applied Thermal Engineering:

Experimental Study of Water Solidification Phenomenon for Ice-on-Coil Thermal Energy Storage Application Utilizing Falling Film

From Powder Technology:

Preparation and thermal properties of stearic acid-benzamide eutectic mixture/expanded graphite composites as phase change materials for thermal energy storage

From International Communications in Heat and Mass Transfer:

Experimental and numerical study of melting of the phase change material tetracosane

From Particuology:

Effect of particle size on the thermal performance of NaNO3/SiO2/C composite phase-change materials

From Materials Chemistry and Physics:

Low-cost, shape-stabilized fly ash composite phase change material synthesized by using a facile process for building energy efficiency

From Construction and Building Materials:

Preparation and thermal properties of encapsulated ceramsite-supported phase change materials used in asphalt pavements

From Applied Energy:

Design student's innovative wheelchair concept wins competition in U.K.

Ben Welter - Friday, September 28, 2018

A student’s creative take on wheelchair design has won a national competition in the United Kingdom.

Kristen Tapping, a product design student at London South Bank University, won the inaugural "Getting Back on Track" design competition held by the law firm Bolt Burdon Kemp. The contest challenged UK-based university students to design a product aimed at improving the lives of people with a spinal cord injury. The law firm awarded Tapping £3000; the university awarded an additional £2,000 (a total of about $6,500).

Tapping's lightweight wheelchair features a seating material enhanced with phase change material to ensure thermal comfort and a split wheel-to-rail system that eases movement through gear reduction and wider pushing surfaces. Tapping provided details on the concept in an email interview.

Q: How did you become interested in product design?

A: "I had worked a wide array of jobs from bartender to personal trainer to TV salesperson and decided a decade after getting my first degree to get into design, something I had always been interested in but wasn't sure I would be good at. I studied a year of interior design but stopped as I felt it was too limited for what I wanted. When I came across industrial/product design, the combination of conceptual design with hands on prototyping was a perfect fit and I dived right in. I am currently on placement in Spain designing automotive interiors for Grupo Antolin."

Q: Moveo's most ingenious feature appears be the propulsion system. Reverse propulsion is used in at least one wheelchair on the market (https://www.rowheels.com/product), but your concept separates the hand wheel from the ground wheel, using a spur gear to maximize force. What inspired you to pursue this approach? Is this configuration unique, as far as wheelchairs?

Kristen TappingA: "This design challenge was specialized for people with spinal cord injuries which are quite different from others - on top of not being able to walk, many cases affect the upper body nerves leading to the inability to have dexterity and strength in the hands. With this in mind, it is exponentially harder for them to push a wheelchair rail as they cannot grab it. The other issue I noticed with all wheelchairs (that I have seen so far at least) is that the user touches the wheel when pushing the rail - I tested this myself by sitting in one and I could not push forward without coming into contact with the wheel. This is obviously not very pleasant or sanitary - would be the equivalent of a non-wheelchair user touching their hand to the base of their shoe after each step.

"The design started with the necessity for the wheel to be separate from the rail to avoid touching the wheel and give users a wider pushing surface in a material that has more inherent grip than metal (here I proposed Infinergy, a BASF/Adidas material that is made from recycled Adidas shoes). After consulting with some engineers, I made this happen through a simple spur gear mechanism where pushing the rail backwards would push the spur gear which would in turn propel the wheel forward. The pushing backwards to move forward simply came about from this spur gear mechanism, however it could be switched back to pushing forward to move forward by simply adding an additional gear. Ideally, the user would be able to manually switch back and forth between pushing forward and backwards to prevent muscle fatigue.

"As far as I know my configuration is unique in wheelchairs - I have only seen the rail being at the side of the wheel as in the standard design. As far as other products go, it follows a bicycle's basic spur gear mechanism."

Q: How did you become familiar with phase change material? Have you used it in other projects?

A: "I came across PCMs while interning at a materials firm and became really fascinated with the process they continually undergo. The reason I used them in this concept is because a less known side-effect of spinal cord injuries is the inability to self-control body temperature - the user's body may be extremely hot when it is cold out, and visa versa. I felt that using a PCM fabric on the seat would help bring down the overall body temperature to a more stable point. I have not used PCMs prior to this project however I am using it in a current concept regarding heat recovery. I am really interested to see where the technology will go - for example the recent university study that managed to activate PCM heat release with a light trigger."

Q: Can you provide details on the PCM fabric used in your design (salt hydrate/biobased/paraffin; peak melt point; energy storage capacity in joules per gram; manufacturer, etc.)?

A: "The fabric I proposed was Schoeller PCM 30092, which has a thermal storage capacity of 35,000 joules per square meter. Schoeller provides a variety of thicknesses which affect the energy storage capacity and padding/comfort level. While specifying a certain fabric would require prototyping and testing, I would suggest one with a composition of 37% polyurethane, 36% polyester and 27% paraffin."

Q: The energy storage capacity of PCM-coated fabric is much less than PCM encapsulated in flexible film. Did you consider using PCM cooling packs instead of PCM fabric?

A: "This option could be explored to see which would work best in this product. One benefit of the PCM-coated fabric is the ability to place it in the washer, something I had in mind for Moveo."

Q: What's next for the Moveo: patent application, prototypes, commercial development, etc.? Have any manufacturers expressed a commercial interest?

A: "While I doubt a patent application would be valid since this was a student competition and the details have already been made public through various publications, I would rather the concept be an inspiration to other wheelchair designers to address the wheel/rail issues stated above. Entering this competition, I wanted to design anything else than a wheelchair, but after being frustrated seeing horrible designs and how they affect the users' daily lives, I decided to give it a go. I did see an interesting student competition entry that uses handles and gears to move forward, but otherwise am disappointed with the lack of innovation from established manufacturers to solve the issue of users having to touch the wheel every time they push.

"I am currently on placement so sadly have no time at the moment to prototype it, however I may make it my final year project once back at LSBU. It would be great to partner with Cerebra to possibly make Moveo a real product, however a wheelchair needs lots of engineering and testing so partnering with an experienced manufacturer as well would make a great team."

Q: The prize includes £3,000 and the chance to undertake a week’s internship at the Cerebra research center. What do you plan to do with the cash award?

A: "London is quite an expensive city, especially on a full-time student budget, so the £3,000 will help me focus on school during my final year at LSBU.  I may also go into prototyping for my final year project.

"I definitely plan on accepting the internship with Cerebra and have talks of squeezing it between the end of my current placement and before school starts. With Cerebra's assistance, I am looking forward to being able to develop other concepts that help people with disabilities and make them come to life using their workshop."

Q: Any idea what you'd like to focus on after graduation?

A: "Really not sure. I am as excited designing a futuristic car interior than I am an ergonomic toilet brush - I just really love design. One thing I do know is I want to design useful products that have a positive impact on people's everyday lives and do not degrade the environment during usage and at end of product life. With this project and having just won the Heatrae Sadia competition (hot water cylinders), I find myself being more and more interested in smart insulation and thermal storage solutions that work sustainably with zero or little energy. With our planet's diminishing resources and increasing temperature, solutions in this field will definitely be a necessity."

PCM briefing: Online master's degree in thermal energy storage; Alexium appoints new CFO

Ben Welter - Thursday, September 27, 2018

Dr. Luisa F. Cabeza• The enrollment period is open for an online master's degree program on thermal energy storage. The program, offered by the University of Lleida and the University of Barcelona, includes "training in technical aspects of TES and the energy system, but it also includes soft skills in patenting and entrepreneurship." The program is directed by Dr. Luisa F. Cabeza of the University of Lleida. 

Siemens Gamesa held a topping-out ceremony this week for its 30MWh electric thermal energy storage facility in Hamburg-Altenwerder, Germany. The pilot facility, which stores energy in 1,000 tons of rock fill at temperatures of 600º C, is in its final phase of construction and due to be fully commissioned in 2019.

• Lauren Boteler, a thermal/packaging engineer for the U.S. Army Research Laboratory's Sensors and Electron Devices Directorate, has been named Woman Engineer of the Year by the American Society of Mechanical Engineers' Electronics Packaging and Photonics Division.

Indonesia has imposed a three-year moratorium on new palm oil plantations and ordered a review of existing ones in an effort to address sustainability and environmental concerns.  

• The U.S. patent system, the first in the world to incentivize large numbers of ordinary citizens to innovate, has long been ranked No. 1 in the world. But over the past few years the system has fallen to 12th. Forbes reports that Andrei Iancu, the new director of the U.S. Patent and Trademark Office, is working to turn that around and "bring about a much-needed revitalization of the American patent system."

Alexium International has appointed Jason Lewis as chief financial officer, succeeding Aaron Krech, who resigned effective Sept. 30. Lewis has over 20 years of experience in financial roles in the specialty chemicals industry. Alexium also announced the appointment of Allen Reihman as chief commercial officer. He will lead the company’s sales, marketing and technology commercialization efforts. Alexium, based in Greer, S.C., and Perth, Australia, makes flame-retardant and PCM-enhanced fabric treatments.

Research roundup: Myristic acid with ethyl cellulose shell; phase-change acoustic heat engine; hybrid personal cooling system; more

Ben Welter - Tuesday, September 25, 2018

From Applied Energy:

Microencapsulation and thermal properties of myristic acid with ethyl cellulose shell for thermal energy storage
Fast and experimentally validated model of a latent thermal energy storage device for system level simulations
Numerical simulation and experimental validation of the solar photovoltaic/thermal system with phase change material
Low-temperature energy conversion using a phase-change acoustic heat engine

From Journal of Energy Storage:

Exploring additives for improving the reliability of zinc nitrate hexahydrate as a phase change material (PCM)

From Energy:

Laboratory assessment of residential building walls containing pipe-encapsulated phase change materials for thermal management
Review on thermal performances and applications of thermal energy storage systems with inorganic phase change materials

From Nano Energy:

Nanoconfinement effects on thermal properties of nanoporous shape-stabilized composite PCMs: A review

From International Journal of Thermal Sciences:

Study of heat and fluid flow during melting of PCM inside vertical cylindrical tube

From Building and Environment:

A new hybrid personal cooling system (HPCS) incorporating insulation pads for thermal comfort management: Experimental validation and parametric study

From International Journal of Heat and Mass Transfer:

An analytical technique for the optimal designs of tube-in-tank thermal energy storage systems using PCM

From 2nd International conference on Advances in Mechanical Engineering:

Study of freezing characteristics of water based grapheme Nano-fluid PCM in a spherical capsule [pdf]
Enhancement of thermal conductivity of PCM using filler graphite powder materials [pdf]

From 10th International Conference on Applied Energy:

A Numerical Investigation into the Heat Transfer and Melting Process of Lauric Acid in a Rectangular Enclosure with Three Values of Wall Heat Flux

Research roundup: Concrete with shape-stable PCM; carbon nanotube laden with D-Mannitol; inorganic PCMs in metal capsules

Ben Welter - Thursday, September 20, 2018

From MATEC Web of Conferences:

Thermal Properties of Concrete Incorporated with Shape-stable Phase Change Material [pdf]

From Advanced Powder Technology:

Multi-walled carbon nanotube laden with D-Mannitol as phase change material: Characterization and experimental investigation

From Advances in Polymer Technology:

The influence of emulsifiers on preparation and properties of microencapsules of melamine–urea–formaldehyde resins with n‚Äźdodecanol as phase change material

From Materials:

Macro-Encapsulation of Inorganic Phase-Change Materials (PCM) in Metal Capsules

Research roundup: Heat capacities of potential organic PCMs; asphalt binders; novel smart textile; modeling hysteresis; more

Ben Welter - Tuesday, September 18, 2018

From Journal of Chemical Thermodynamics:

Heat capacities of potential organic phase change materials

From Renewable Energy:

Effects of microencapsulated phase change materials on the performance of asphalt binders
An improved, generalized effective thermal conductivity method for rapid design of high temperature shell-and-tube latent heat thermal energy storage systems
Multi-objective optimisation of thermal energy storage using phase change materials for solar air systems

From Energy:

A comprehensive study of properties of paraffin phase change materials for solar thermal energy storage and thermal management applications
Evaluation of a novel solar driven sorption cooling/heating system integrated with PCM storage compartment

From Chemical Engineering Journal:

Shape-stabilized phase change materials based on porous supports for thermal energy storage applications
Novel smart textile with phase change materials encapsulated core-sheath structure fabricated by coaxial electrospinning

From International Journal of Heat and Mass Transfer:

Experimental research on the effective heating strategies for a phase change material based power battery module
Modeling hysteresis in the phase transition of industrial-grade solid/liquid PCM for thermal energy storages

From Applied Thermal Engineering:

Determination of heat transfer coefficients in direct contact latent heat storage systems