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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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Swedish university developing PCM/TES design tool for buildings

Ben Welter - Monday, April 09, 2018

Researchers at Chalmers University of Technology in Sweden are developing a design tool for PCM-based thermal energy storage for heating and cooling of buildings.

The project is being conducted by the Division of Building Technology within the university's Architecture and Civil Engineering Department. Sweden's Environmental Protection Agency and Energy Agency and the university are jointly funding the effort.

To better understand the needs of potential users of the tool, the research team is inviting professionals in the building sector – such as real estate owners, energy consultants, PCM producers and specifying engineers – to participate in a survey, whether or not they have PCM experience. The survey can be completed in 10 to 15 minutes. Personal data will be kept confidential. Participants who wish to receive the findings of the survey are asked to provide their email address at the end of the questionnaire.

For more information on the project, contact Dr. Nikolaos Stathopoulos, nikstat[at]chalmers.se.

https://goo.gl/forms/iEYCD5zIDUlDW5eu1

EnerSTOCK 2018 will feature PCM experts from around the world

Ben Welter - Monday, April 09, 2018

The agenda has been posted for the 14th International Energy Storage Conference – EnerSTOCK 2018 – to be held at Cukurova University in Turkey April 25-28. Speakers and topics focusing on phase change material include:

• Mohammed Farid, New Zealand: "Industrial Applications of Energy Storage with Phase Change Materials"

• Zafer Üre, United Kingdom: "Phase Change Material (PCM) Based Energy Storage Materials and Global Application Examples"

• Mónica Delgado, Ana Lázaro, Javier Mazo, Conchita Peñalosa, José María Marín and Belén Zalba, Spain: "Experimental Analysis of a Coiled Stirred Tank Containing a Low Cost PCM Emulsion as Thermal Energy Storage System. Comparison to Other TES Systems"

• Saman Nimali Gunasekara, Monika Ignatowicz, Justin Ningwei Chiu and Viktoria Martin, Sweden: "Thermal Conductivity Measurement of Erythritol, Xylitol and Their Blends for Phase Change Materials Design - A Methodological Study"

• Laura Quant, Gonzalo Diarce, Álvaro Campos-Celador, Ana García-Romero and Jean-Pierre Bédécarrats, Spain: "A Degradation Kinetics and Supercooling Study of the Urea-Sodium Nitrate Eutectic Mixture as a PCM"

• Catarina Araújo, José André Pinheiro and Luís Bragança, Portugal: "Economic Viability, Thermal Comfort and Energy Efficiency of Phase Change Materials Applied in the North of Portugal"

• Gennady Ziskind, Israel: "Modelling Approaches for PCM-Based Storage Systems"

For more information about the conference, contact enerstock2018@cu.edu.tr.

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]

Research roundup: Biomass carbon aerogels from succulents; novel hybrid cooling for lithium-ion batteries; calcium carbonate, graphene oxide shell; more

Ben Welter - Thursday, March 08, 2018

Leakage-proof Phase Change Composites Supported by Biomass Carbon Aerogels from Succulents [Green Chemistry]

Experimental Investigation of a Novel Hybrid Cooling Method for Lithium-ion Batteries [Applied Thermal Engineering]

Modified phase change microcapsules with calcium carbonate and graphene oxide shell for enhanced energy storage and leakage prevention [Sustainable Chemistry & Engineering]

A Novel Thermal Energy Storage System in Smart Building Based on Phase Change Material [IEEE Transactions on Smart Grid]

Study of Material Compatibility for a Thermal Energy Storage System with Phase Change Material [Energies]

Is a self-sufficient building energy efficient? Lesson learned from a case study in Mediterranean climate [Applied Energy]

Research roundup: Coating approach for a PCM; triple concentric-tube latent heat storage; hybrid shell materials; more

Ben Welter - Tuesday, March 06, 2018

Coating approach for a Phase Change Material (PCM)  [Powder Technology]

Thermal performance analysis of combined solar collector with triple concentric-tube latent heat storage systems [Energy and Buildings]

Nanoencapsulated phase change materials with polymer-SiO2 hybrid shell materials: Compositions, morphologies, and properties [Energy Conversion and Management]

Investigation on the charging process of a multi-PCM latent heat thermal energy storage unit for use in conventional air-conditioning systems [Energy]

A review of the application of carbon materials in solar thermal energy storage [Solar Energy]

Feasibility analysis for enhancement of output power of the PV panels by use of PCM (Phase Change Material) based cooling technique [pdf] [Malaya Journal of Matematik]

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: Thermal performance of PCM wallboards; baby incubator; characterization of desert sand; more

Ben Welter - Thursday, February 22, 2018

• An Innovative Apparatus for Simulating Daily Temperature for Investigating Thermal Performance of Wallboards Incorporating PCMs [Energy and Buildings]

Application of Combined Materials for Baby Incubator [Procedia Manufacturing]

Characterization of desert sand to be used as a high-temperature thermal energy storage medium in particle solar receiver technology [Applied Energy]

Use of partial load operating conditions for latent thermal energy storage management [Applied Energy]

Melting phenomenon in a finned thermal storage system with graphene nano-plates for medium temperature applications [Energy Conversion and Management]

Ca(NO3)2-NaNO3/expanded graphite composite as a novel shape-stable phase change material for mid- to high-temperature thermal energy storage [Energy Conversion and Management]

Cumulative energy demand and global warming potential of a building-integrated solar thermal system with/without phase change material [Journal of Environmental Management]

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]

Novel thermal resonator draws power from daily temperature swings

Ben Welter - Friday, February 16, 2018

MIT thermal resonator test device

Researchers at the Massachusetts Institute of Technology have developed a system that uses phase change material and graphene to convert daily fluctuations in ambient temperature into electrical power. 

The system, called a thermal resonator, is described in a paper published in the journal Nature Communications.

“We basically invented this concept out of whole cloth,” one of the authors, professor Michael Strano, told MIT News. “We’ve built the first thermal resonator. It’s something that can sit on a desk and generate energy out of what seems like nothing. We are surrounded by temperature fluctuations of all different frequencies all of the time. These are an untapped source of energy.”

MIT News writes:

"The researchers realized that to produce power from temperature cycles, they needed a material that is optimized for a little-recognized characteristic called thermal effusivity — a property that describes how readily the material can draw heat from its surroundings or release it. Thermal effusivity combines the properties of thermal conduction (how rapidly heat can propagate through a material) and thermal capacity (how much heat can be stored in a given volume of material). In most materials, if one of these properties is high, the other tends to be low. Ceramics, for example, have high thermal capacity but low conduction.

"To get around this, the team created a carefully tailored combination of materials. The basic structure is a metal foam, made of copper or nickel, which is then coated with a layer of graphene to provide even greater thermal conductivity. Then, the foam is infused with a kind of wax called octadecane, a phase-change material, which changes between solid and liquid within a particular range of temperatures chosen for a given application.

"A sample of the material made to test the concept showed that, simply in response to a 10-degree-Celsius temperature difference between night and day, the tiny sample of material produced 350 millivolts of potential and 1.3 milliwatts of power — enough to power simple, small environmental sensors or communications systems."

The researchers say the system could be used, for example, to continuously power remote sensing systems for years.

http://news.mit.edu/2018/system-draws-power-daily-temperature-swings-0215