Phase Change Matters RSS

 

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.

RECENT POSTS

TAGS

ARCHIVE

Patent application: Cooling pillow with phase change material

Ben Welter - Tuesday, May 29, 2018

Werner cooling pillow patent drawingU.S. patent application 20180140116 (applicant Marc L. Werner, Plantation, Fla.):

"A cooling pillow generates a gust of cooled air when compressed. A solid, resilient, compressible foam block forms a core of the cooling pillow. A phase change material layer adhered to a surface of the foam block. Holes can be formed in the foam block to enhance the feel of the pillow and to improve the speed at which air is displaced when the cooling pillow is compressed."

http://www.freepatentsonline.com/20180140116.pdf

Updated PCM testing specifications are now available on RAL website

Ben Welter - Monday, May 28, 2018

A revised version of a document outlining the RAL Quality Association PCM’s quality testing program has been approved by the association's governing body and is now available on the association's website.

RAL quality mark“Quality and Testing Specifications for Phase Change Materials,” also known as RAL-GZ 896, sets out the general principles for PCM. The document defines PCM, PCM composites, PCM objects and PCM systems; establishes performance requirements; and outlines the nature and scope of monitoring measures.

Improvements to RAL-GZ 896 include:

• Clearer structure and wording. 

• Heat flow meter measurements are now permissible. This will make measuring larger PCM products much easier.

• Reduced testing frequency during cycling. The prior edition required testing the quality criteria at fixed intervals during cycling. The new edition recommends testing at intervals during cycling (to reduce the risk that cycling is continued until the end despite the sample has already failed) and the intervals are wider. These changes are designed to reduce the cost of testing.

• Segregation, an important criterion for salt hydrates especially, was approved as an additional quality requirement.

• Better explanation of monitoring.

“The now published document is a huge improvement” said Stefan Thomann, the association's managing director. “Over a period of two years, an expert task group added crucial requirements, new measurement methods and better explanation and guidance. The RAL Quality Mark as an independent proof of outstanding quality has become even more meaningful now.”

http://www.pcm-ral.org/pcm/en/2018/05/25/new-quality-testing-specifications-published

Patent application: Passive thermal system comprising heat pipe and PCM for use in space

Ben Welter - Thursday, May 24, 2018

WorldVu Satellites patent drawing
U.S. patent application 20180134416, (applicant WorldVu Satellites Ltd., Arlington, Va.):

"A passive thermal system for use in a satellite and other aerospace applications includes a container having a heat-pipe working fluid disposed in a first chamber and a Phase Change Material (PCM) disposed in a second chamber that substantially surrounds the first chamber. The first chamber contains a wick for transporting the heat-pipe working fluid. The exterior of the first chamber has fins, etc., that extend into the PCM for heat spreading and increased interface area."

http://www.freepatentsonline.com/20180134416.pdf

Patent application: Phase change heat storage-type electrical water heater

Ben Welter - Tuesday, May 22, 2018

U.S. patent application 20180135886 (applicant Pioneer Energy Co. Ltd., Suzhou, China):

"The utility model relates to a phase change heat storage-type electrical water heater, comprising a phase change heat storage device, wherein the phase change heat storage device comprises a housing; the housing is internally filled in with a phase change material; a heat exchange pipe is embedded in the phase change material; the heat exchange pipe has one end connected with a circulating medium inflow pipe and the other end connected with a circulating medium outflow pipe; the circulating medium inflow pipe and the circulating medium outflow pipe are externally connected with a circulating medium backflow pipe there-between; the circulating medium inflow pipe, the heat exchange pipe, the circulating medium outflow pipe and the circulating medium backflow pipe form a circulating system in which a circulating medium flow; the circulating medium backflow pipe is provided with a circulating pump, an electrical heater, a function switching valve and a heat exchanger in turn; and the heat exchanger is provided with a water inlet pipe for heating tap water and a water outlet pipe. Compared with the prior art, the phase change heat storage-type electrical water heater heats water for a long time, has a high yield of hot water, and is safe and reliable."

http://www.freepatentsonline.com/20180135886.pdf

PCM briefing: Texas undergrads win ASHRAE equipment grant; 1414 Degrees among exhibitors at Australia energy storage conference

Ben Welter - Monday, May 21, 2018

• A University of North Texas research project, “Design of Energy Recovery Heat Exchanger Coupled with Phase Change Materials for Building Temperature Control,” is one of 25 undergraduate projects awarded a 2018 equipment grant from ASHRAE. The grants, totaling more than $113,000, will help the winning students complete undergraduate projects at schools around the world.

• New from HTF Market Intelligence: "United States Cold Chain Equipments Market Report 2018"

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

• New from QY Research: "Global Thermal Energy Storage (TES) Industry 2018 Market Research Report"

CouchBed

• The retail market is full of PCM-topped mattresses, pillows and seat cushions. Here's the first fold-out couch we've seen that features the temperature-control technology. The CouchBed, made by an Arizona company, is a 10-inch memory foam mattress that’s “made with 100% CertiPur certified ultra-dense memory foam, combined with phase change material to actively cool the sleeping surface."

• The U.S. Department of Energy has announced $72 million for new projects to advance high-temperature concentrating solar power technologies. The high-temperature thermal storage systems targeted by this program seek to achieve at least 700 degrees C, which would boost the efficiency and lower the cost of electricity. Awardees include Brayton Energy, Hampton, N.H, $7.6 million; National Renewable Energy Laboratory, Golden, Colo., $7 million; and Sandia National Laboratories, Albuquerque, N.M., $9.5 million.

• Under a new joint development agreement, the Moroccan Agency for Sustainable Energy will join Cleanergy AB's board of directors and help the Swedish firm advance its concentrated solar power and storage technology. The agency will fund a “substantial part” of Cleanergy's research and development work on thermal energy storage. Cleanergy, in turn, will be able to test its technology using the agency's facility in Ouarzazate, Morocco.

• A Ph.D. candidate at Delft University of Technology outlines a strategy to maximize the potential of aquifer thermal energy storage and phase out the use of natural gas in the Netherlands.

• Thermal energy storage company 1414 Degrees will be among more than 60 companies from around the world scheduled to attend the Australian Energy Storage Conference and Exhibition May 23-24 at the Adelaide Convention Center. Other exhibitors include Tesla, Toshiba, GE and Victron Energy.

Research roundup: Thermoelectric generator system; solar chimney; novel thermal management system for lithium-ion battery pack; more

Ben Welter - Friday, May 18, 2018

From Energy:

Protection and Thermal Management of Thermoelectric Generator System Using Phase Change Materials: An Experimental Investigation
Performance analysis of a novel thermal management system with composite phase change material for a lithium-ion battery pack

From Solar Energy:

Efficient energy storage technologies for photovoltaic systems
The experimental appraisement of the effect of energy storage on the performance of solar chimney using phase change material

From Applied Thermal Engineering:

Improving thermal management of electronic apparatus with paraffin (PA)/expanded graphite (EG)/graphene (GN) composite material
Experimental exploration of incorporating form-stable hydrate salt phase change materials into cement mortar for thermal energy storage

From Thermal Science and Engineering Progress:

Role of Metallic Foam in Heat Storage in the Presence of Nanofluid and MicroEncapsulated Phase Change Material

From International Journal of Heat and Mass Transfer:

Numerical investigation of thermal and optical performance of window units filled with nanoparticle enhanced PCM

From Applied Energy:

Cost estimation and sensitivity analysis of a latent thermal energy storage system for supplementary cooling of air cooled condensers
Influence of design on performance of a latent heat storage system at high temperatures

From Energy Conversion and Management:

Preparation and investigation of distinct and shape stable paraffin/SiO2 composite PCM nanospheres

From Energy and Buildings:

Parametric Analysis of Using PCM Walls for Heating Loads Reduction

Axiotherm data cooling center concept honored at Future Thinking conference

Ben Welter - Friday, May 18, 2018

A data center cooling concept developed by Axiotherm GmbH and Frigoteam Handels GmbH was among the technologies honored at last month's Future Thinking conference in Darmstadt, Germany.

The concept, "Security of supply and emergency operation in data centers by integration of PCM cold storage," took third place in the energy technology category. Based on Axiotherm's HeatSel thermal storage technology, the system is designed to ensure the cooling of data centers in the event of a power outage. At the same time, the use of photovoltaic power and free cooling can increase system efficiency and reduce emissions during regular operations.

Dirk BüttnerAxiotherm, a subsidiary of ESDA Technologie GmbH, specializes in developing macro-encapsulation of phase change materials for various applications. Dirk Büttner, Axiotherm's chief research officer, answered a few questions about the technology by e-mail: 

Q: The award is based on a data center cooling concept, not a working model or pilot project, correct?

A: "Correct, the award is based on a cooling concept, but there have already been diverse Frigoteam cooling systems with the Axiotherm PCM-Storage implemented, only for other fields of application."

Q: Is this the system that you and Yvonne Reimann of Croda gave a presentation on at the 5th Swiss Symposium Thermal Energy Storage in Lucerne in January?

A: "Yes, the Axiotherm Hybrid-PCM-Storage was the central element of the presentation in Lucerne."

Q: Is CrodaTherm specified as the PCM used in the data cooling center concept?

A: "No, in this system a subzero PCM developed by Axiotherm."

Axiotherm thermal storage tankQ: What are the peak melting points and energy storage capacities of the PCMs available for use in the system?

A: "Starting at -33°C up to +12°C. The storage capacity of the Hybrid-PCM-System is typically approximately 50 kWh /m3 (@dT = 10 K)."

Q: What are the dimensions of the HeatSel discs, and what are they made of?

A: There are two types of HeatSels, one with a diameter of 180 mm for smaller tanks, and one with a diameter of 270 mm for big tanks (with a diameter >1,20 m). The maximum layer thickness in both cases is less than 30 mm, therefore, compared to classical spherical elements, a four times higher thermal output power can be achieved. The (diffusion resistant) encapsulation material depends on the operating temperature, the basis are e.g. PP or PE-HD.

Q: What are the next steps in the development of this system, technically and commercially speaking?

A: "First step was the successful proof of concept and initial market entry through launching customers, like Frigoteam. 

"The next step is the extension of distribution network through fast-following customers. Here we are looking for further potential strategic partnerships with fast-following customers, like tank manufacturers and manufacturers of cooling/heating systems.

"Another step is the diversification of customers for further applications, such as for industries working with process heat and cooling as well as manufacturers of air conditioning and further cooling systems."

Patent application: Electric vehicle powered by capacitive energy storage modules

Ben Welter - Wednesday, May 16, 2018

U.S. patent application 20180126857 (applicant: Capacitor Sciences Inc., Menlo Park, Calif.):

"The invention relates to a capacitor based energy storage module and an electric vehicle using the same. For providing an electric vehicle which can meet the requirements of long distance running and rapid acceleration at the same time, the electric vehicle of present invention comprising: An electric control unit controlling all operations of the electric vehicle; An energy storage unit having one or more energy devices based on meta-capacitor which provides needed electric energy of the electric vehicle; A DC-DC converter receiving control signal from said electric control unit to convert the energy from said energy storage unit then provide to motor; A motor converting the electric energy into mechanical energy to drive the wheels; Wheels are driven by the motor to make the electric vehicle run. ... [The] capacitive energy storage module may include a cooling mechanism in thermal contact with the capacitive energy storage device and/or the DC-voltage converter. Such a cooling mechanism may be, e.g., a passive cooling mechanism, an active cooling system using air, water, ethylene glycol as a coolant; phase-change material, or any combination thereof."

http://www.freepatentsonline.com/20180126857.pdf

Patent application: Method and system for battery protection

Ben Welter - Wednesday, May 16, 2018

Milwaukee battery pack patent drawingU.S. patent application 20180131036 (applicant Milwaukee Electric Tool Corp., Brookfield, Wis.):

"The present invention provides a system and method for battery protection. In one construction and in some aspects, the invention provides a system and method for monitoring the temperature of a battery. In another construction and in some aspects, the invention provides a system and method for transferring heat within a battery pack. In another construction and in some aspects, the invention provides a system and method for transferring heat within a battery pack via a phase change material [300]."

http://www.freepatentsonline.com/20180131036.pdf

PCM briefing: BASF to spend $2.2 billion on R&D; Sunamp heat batteries qualify for Scottish loan program

Ben Welter - Monday, May 14, 2018

Chemical & Engineering News reports that the top 50 U.S. chemical producers generated $285.4 billion in chemical revenues in 2017, a 9.4 percent increase over 2016. 

• Under its new CEO, Martin Brüdermüller, BASF is planning to pour $2.2 billion into research and development, making BASF the second-highest investor in innovation in the chemicals sector after DuPont

Grace HsiaWarmilu LLC founder Grace Hsia, right, is on Crain's 20 in Their 20s list honoring Michigan's rising young leaders. Warmilu makes a PCM-equipped infant warming blanket.   

Axiom Exergy of Richmond, Calif., has raised $7.6 million in Series A funding, for a total of $12.5 million raised to date. The round was co-led by GXP Investments and Shell Ventures. Axiom's PCM-based "refrigeration battery" is designed to reduce energy supermarket energy costs. 

Sunamp Ltd. is applauding the Scottish government's decision to include heat batteries to its Home Energy Scotland Loan program. Homeowners and private landlords are now eligible to apply for an interest-free loan of up to 6,000 pounds to install Sunamp's PCM-based heat battery systems.

• Albuquerque-based SAVSU Technologies is launching two new high-performance shipping containers branded as Evo Extreme. The containers are designed for the 2-8C and -80C temperature ranges.

Emirates District Cooling has won a contract to supply a district cooling system to the Expo Dubai 2020 event. The system will have a capacity of 60,000 tons of refrigeration. 

• Georg Rodriguez, managing director at MUTZ Engineering mbH, will present a free lecture, presumably in German, on "phase change materials for temperature management and energy storage in buildings" on Tuesday, May 15, at the KEBAB lecture room in Berlin.