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[[File:Handwaermer12.jpg|thumb|A [[sodium acetate]] [[heating pad]]. When the sodium acetate solution crystallises, it becomes warm.]] |
[[File:Handwaermer12.jpg|thumb|A [[sodium acetate]] [[heating pad]]. When the sodium acetate solution crystallises, it becomes warm.]] |
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[[File:Heating pad in action.ogv|thumb|A video showing a "heating pad" in action]] |
[[File:Heating pad in action.ogv|thumb|A video showing a "heating pad" in action]] |
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[[File:Heating pad thermal video.webm|thumb|A video showing a "heating pad" with a thermal camera]] |
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A '''phase |
A '''phase-change material''' ('''PCM''') is a substance which releases/absorbs sufficient energy at [[phase transition]] to provide useful heat or cooling. Generally the transition will be from one of the first two fundamental [[states of matter]] - solid and liquid - to the other. The phase transition may also be between non-classical states of matter, such as the conformity of crystals, where the material goes from conforming to one crystalline structure to conforming to another, which may be a higher or lower energy state. |
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The energy released/absorbed by phase transition from solid to liquid, or vice versa, the [[heat of fusion]] is generally much higher than the [[sensible heat]]. Ice, for example, requires 333.55 J/g to melt, but then water will rise one degree further with the addition of just 4.18 J/g. Water/ice is therefore a very useful phase change material and has been used to store winter cold to cool buildings in summer since at least the time of the Achaemenid Empire. |
The energy released/absorbed by phase transition from solid to liquid, or vice versa, the [[heat of fusion]] is generally much higher than the [[sensible heat]]. Ice, for example, requires 333.55 J/g to melt, but then water will rise one degree further with the addition of just 4.18 J/g. Water/ice is therefore a very useful phase change material and has been used to store winter cold to cool buildings in summer since at least the time of the [[Achaemenid Empire]]. |
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By melting and solidifying at the phase |
By melting and solidifying at the phase-change temperature (PCT), a PCM is capable of storing and releasing large amounts of energy compared to [[sensible heat]] storage. Heat is absorbed or released when the material changes from solid to liquid and vice versa or when the internal structure of the material changes; PCMs are accordingly referred to as [[latent heat]] storage (LHS) materials. |
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There are two principal classes of phase |
There are two principal classes of phase-change material: organic (carbon-containing) materials derived either from petroleum, from plants or from animals; and salt hydrates, which generally either use natural salts from the sea or from mineral deposits or are by-products of other processes. A third class is solid to solid phase change. |
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PCMs are used in many different commercial applications where energy storage and/or stable temperatures are required, including, among others, heating pads, cooling for telephone switching boxes, and clothing. |
PCMs are used in many different commercial applications where energy storage and/or stable temperatures are required, including, among others, heating pads, cooling for telephone switching boxes, and clothing. |
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By far the biggest potential market is for building heating and cooling. In this application area, PCMs hold potential in light of the progressive reduction in the cost of renewable electricity, coupled with the intermittent nature of such electricity. This can result in a misfit between peak demand and availability of supply. In North America, China, Japan, Australia, Southern Europe and other developed countries with hot summers, peak supply is at midday while peak demand is from around 17:00 to 20:00. This creates opportunities for thermal storage media. |
By far the biggest potential market is for building heating and cooling. In this application area, PCMs hold potential in light of the progressive reduction in the cost of renewable electricity, coupled with the intermittent nature of such electricity. This can result in a misfit between peak demand and availability of supply. In North America, China, Japan, Australia, Southern Europe and other developed countries with hot summers, peak supply is at midday while peak demand is from around 17:00 to 20:00. This creates opportunities for thermal storage media. |
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Solid-liquid phase |
Solid-liquid phase-change materials are usually encapsulated for installation in the end application, to contain in the liquid state. In some applications, especially when incorporation to textiles is required, phase change materials are [[micro-encapsulation|micro-encapsulated]]. Micro-encapsulation allows the material to remain solid, in the form of small bubbles, when the PCM core has melted. |
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==Characteristics and classification== |
==Characteristics and classification== |
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===Organic PCMs=== |
===Organic PCMs=== |
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Hydrocarbons, primarily paraffins (C<sub>''n''</sub>H<sub>2''n''+2</sub>) and lipids but also sugar alcohols.<ref>[http://myweb.dal.ca/mawhite/3303/supplementals/Heat%20Storage%20Systems.pdf "Heat storage systems"] (PDF) by Mary Anne White, brings a list of advantages and disadvantages of Paraffin heat storage. A more complete list can be found in [https://www.accessscience.com/ AccessScience from McGraw-Hill Education], DOI 10.1036/1097-8542.YB020415, last modified: March 25, 2002 based on 'Latent heat storage in concrete II, Solar Energy Materials, Hawes DW, Banu D, Feldman D, 1990, 21, pp.61–80.</ref><ref>{{cite journal |last1=Floros |first1=Michael C. |last2=Kaller |first2=Kayden L. C. |last3=Poopalam |first3=Kosheela D. |last4=Narine |first4=Suresh S. |date=2016-12-01 |title=Lipid derived diamide phase change materials for high temperature thermal energy storage |journal=Solar Energy |volume=139 |pages=23–28 |doi=10.1016/j.solener.2016.09.032 |bibcode=2016SoEn..139...23F}}</ref><ref>{{cite journal |last1=Agyenim |first1=Francis |last2=Eames |first2=Philip |last3=Smyth |first3=Mervyn |date=2011-01-01 |title=Experimental study on the melting and solidification behaviour of a medium temperature phase change storage material (Erythritol) system augmented with fins to power a LiBr/H2O absorption cooling system |journal=Renewable Energy |volume=36 |issue=1 |pages=108–117 |doi=10.1016/j.renene.2010.06.005}}</ref> |
Hydrocarbons, primarily paraffins (C<sub>''n''</sub>H<sub>2''n''+2</sub>) and lipids but also sugar alcohols.<ref>[http://myweb.dal.ca/mawhite/3303/supplementals/Heat%20Storage%20Systems.pdf "Heat storage systems"] {{Webarchive|url=https://web.archive.org/web/20200629195205/http://myweb.dal.ca/mawhite/3303/supplementals/Heat%20Storage%20Systems.pdf |date=2020-06-29 }} (PDF) by Mary Anne White, brings a list of advantages and disadvantages of Paraffin heat storage. A more complete list can be found in [https://www.accessscience.com/ AccessScience from McGraw-Hill Education], DOI 10.1036/1097-8542.YB020415, last modified: March 25, 2002 based on 'Latent heat storage in concrete II, Solar Energy Materials, Hawes DW, Banu D, Feldman D, 1990, 21, pp.61–80.</ref><ref>{{cite journal |last1=Floros |first1=Michael C. |last2=Kaller |first2=Kayden L. C. |last3=Poopalam |first3=Kosheela D. |last4=Narine |first4=Suresh S. |date=2016-12-01 |title=Lipid derived diamide phase change materials for high temperature thermal energy storage |journal=Solar Energy |volume=139 |pages=23–28 |doi=10.1016/j.solener.2016.09.032 |bibcode=2016SoEn..139...23F}}</ref><ref>{{cite journal |last1=Agyenim |first1=Francis |last2=Eames |first2=Philip |last3=Smyth |first3=Mervyn |date=2011-01-01 |title=Experimental study on the melting and solidification behaviour of a medium temperature phase change storage material (Erythritol) system augmented with fins to power a LiBr/H2O absorption cooling system |journal=Renewable Energy |volume=36 |issue=1 |pages=108–117 |doi=10.1016/j.renene.2010.06.005}}</ref> |
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* Advantages |
* Advantages |
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===Inorganic=== |
===Inorganic=== |
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Salt hydrates (M<sub>''x''</sub>N<sub>''y''</sub>·''n''H<sub>2</sub>O)<ref>{{cite web |url=https:// |
Salt hydrates (M<sub>''x''</sub>N<sub>''y''</sub>·''n''H<sub>2</sub>O)<ref>{{cite web |url=https://www.sciencedirect.com/topics/engineering/salt-hydrate |title=Phase Change Energy Solutions |access-date=February 28, 2018}}</ref> |
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*Advantages |
*Advantages |
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** Sustainability |
** Sustainability |
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* Disadvantages |
* Disadvantages |
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** Difficult to prevent |
** Difficult to prevent [[incongruent melting]] and phase separation upon cycling, which can cause a significant loss in latent heat enthalpy.<ref>{{cite journal |last=Cantor |first=S. |date=1978 |title=DSC study of melting and solidification of salt hydrates |url=https://digital.library.unt.edu/ark:/67531/metadc1446857/ |journal=Thermochimica Acta |volume=26 |issue=1–3 |pages=39–47 |doi=10.1016/0040-6031(78)80055-0}}<!--https://digital.library.unt.edu/ark:/67531/metadc1446857/--></ref> |
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** Can be corrosive to many other materials, such as metals.<ref>{{cite journal |author1=olé, A. |author2=Miró, L. |author3=Barreneche, C. |author4=Martorell, I. |author5=Cabeza, L.F. |date=2015 |title=Corrosion of metals and salt hydrates used for thermochemical energy storage |url=https://zenodo.org/record/3422119 |journal=Renewable Energy |volume=75 |pages=519–523 |doi=10.1016/j.renene.2014.09.059}}</ref><ref>{{cite journal |author1=A. Sharma |author2=V. Tyagi |author3=C. Chen |author4=D. Buddhi |date=February 2009 |title=Review on thermal energy storage with phase change materials and applications |journal=Renewable and Sustainable Energy Reviews |volume=13 |issue=2 |pages=318–345 |doi=10.1016/j.rser.2007.10.005}}</ref><ref>{{cite journal |last1=Sharma |first1=Someshower Dutt |last2=Kitano |first2=Hiroaki |last3=Sagara |first3=Kazunobu |date=2004 |title=Phase Change Materials for Low Temperature Solar Thermal Applications |journal=Res. Rep. Fac. Eng. Mie Univ. |volume=29 |pages=31–64 |s2cid=17528226 |url=https://pdfs.semanticscholar.org/5492/cd76932f222b0bb74c5c5331aec45f879fbf.pdf |url-status=dead |archive-url=https://web.archive.org/web/20200627085135/https://pdfs.semanticscholar.org/5492/cd76932f222b0bb74c5c5331aec45f879fbf.pdf |archive-date=2020-06-27}}</ref> This can be overcome by only using specific metal-PCM pairings or encapsulation in small quantities in non-reactive plastic. |
** Can be corrosive to many other materials, such as metals.<ref>{{cite journal |author1=olé, A. |author2=Miró, L. |author3=Barreneche, C. |author4=Martorell, I. |author5=Cabeza, L.F. |date=2015 |title=Corrosion of metals and salt hydrates used for thermochemical energy storage |url=https://zenodo.org/record/3422119 |journal=Renewable Energy |volume=75 |pages=519–523 |doi=10.1016/j.renene.2014.09.059 }}{{Dead link|date=October 2023 |bot=InternetArchiveBot |fix-attempted=yes }}</ref><ref>{{cite journal |author1=A. Sharma |author2=V. Tyagi |author3=C. Chen |author4=D. Buddhi |date=February 2009 |title=Review on thermal energy storage with phase change materials and applications |journal=Renewable and Sustainable Energy Reviews |volume=13 |issue=2 |pages=318–345 |doi=10.1016/j.rser.2007.10.005}}</ref><ref>{{cite journal |last1=Sharma |first1=Someshower Dutt |last2=Kitano |first2=Hiroaki |last3=Sagara |first3=Kazunobu |date=2004 |title=Phase Change Materials for Low Temperature Solar Thermal Applications |journal=Res. Rep. Fac. Eng. Mie Univ. |volume=29 |pages=31–64 |s2cid=17528226 |url=https://pdfs.semanticscholar.org/5492/cd76932f222b0bb74c5c5331aec45f879fbf.pdf |url-status=dead |archive-url=https://web.archive.org/web/20200627085135/https://pdfs.semanticscholar.org/5492/cd76932f222b0bb74c5c5331aec45f879fbf.pdf |archive-date=2020-06-27}}</ref> This can be overcome by only using specific metal-PCM pairings or encapsulation in small quantities in non-reactive plastic. |
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** Change of volume is very high in some mixtures |
** Change of volume is very high in some mixtures |
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** Super cooling can be a problem in solid–liquid transition, necessitating the use of nucleating agents which may become inoperative after repeated cycling |
** Super cooling can be a problem in solid–liquid transition, necessitating the use of nucleating agents which may become inoperative after repeated cycling |
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* Availability |
* Availability |
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== |
==Thermophysical properties== |
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Key thermophysical properties of phase-change materials include: [[Melting point|Melting point (T<sub>m</sub>)]], [[Enthalpy of fusion|Heat of fusion (Δ''H<sub>fus</sub>'')]], [[Specific heat capacity|Specific heat (''c<sub>p</sub>'')]] (of solid and liquid phase), [[Density|Density (ρ)]] (of solid and liquid phase) and [[thermal conductivity]]. Values such as volume change and [[volumetric heat capacity]] can be calculated there from. |
Key thermophysical properties of phase-change materials include: [[Melting point|Melting point (T<sub>m</sub>)]], [[Enthalpy of fusion|Heat of fusion (Δ''H<sub>fus</sub>'')]], [[Specific heat capacity|Specific heat (''c<sub>p</sub>'')]] (of solid and liquid phase), [[Density|Density (ρ)]] (of solid and liquid phase) and [[thermal conductivity]]. Values such as volume change and [[volumetric heat capacity]] can be calculated there from. |
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As phase change materials perform best in small containers, therefore they are usually divided in cells. The cells are shallow to reduce static head – based on the principle of shallow container geometry. The packaging material should conduct heat well; and it should be durable enough to withstand frequent changes in the storage material's volume as phase changes occur. It should also restrict the passage of water through the walls, so the materials will not dry out (or water-out, if the material is [[hygroscopic]]). Packaging must also resist leakage and [[corrosion]]. Common packaging materials showing chemical compatibility with room temperature PCMs include [[stainless steel]], [[polypropylene]], and [[polyolefin]]. |
As phase change materials perform best in small containers, therefore they are usually divided in cells. The cells are shallow to reduce static head – based on the principle of shallow container geometry. The packaging material should conduct heat well; and it should be durable enough to withstand frequent changes in the storage material's volume as phase changes occur. It should also restrict the passage of water through the walls, so the materials will not dry out (or water-out, if the material is [[hygroscopic]]). Packaging must also resist leakage and [[corrosion]]. Common packaging materials showing chemical compatibility with room temperature PCMs include [[stainless steel]], [[polypropylene]], and [[polyolefin]]. |
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[[Nanoparticle]]s such as carbon nanotubes, graphite, graphene, metal and metal oxide can be dispersed in PCM. It is worth noting that inclusion of nanoparticles will not only alter thermal conductivity characteristic of PCM but also other characteristics as well, including latent heat capacity, sub-cooling, phase change temperature and its duration, density and viscosity. The new group of PCMs called NePCM.<ref>{{cite journal |last1=Khodadadi |first1=J. M. |last2=Hosseinizadeh |first2=S. F. |date=2007-05-01 |title=Nanoparticle-enhanced phase change materials (NEPCM) with great potential for improved thermal energy storage |url=https://www.sciencedirect.com/science/article/pii/S0735193307000437 |journal=International Communications in Heat and Mass Transfer |language=en |volume=34 |issue=5 |pages=534–543 |doi=10.1016/j.icheatmasstransfer.2007.02.005 |issn=0735-1933}}</ref> NePCMs can be added to metal foams to build even higher thermal conductive combination.<ref>{{cite journal |last1=Samimi Behbahan |first1=Amin |last2=Noghrehabadi |first2=Aminreza |last3=Wong |first3=C.P. |last4=Pop |first4=Ioan |last5=Behbahani-Nejad |first5=Morteza |date=2019-01-01 |title=Investigation of enclosure aspect ratio effects on melting heat transfer characteristics of metal foam/phase change material composites |url=https://doi.org/10.1108/HFF-11-2018-0659 |journal=International Journal of Numerical Methods for Heat & Fluid Flow |volume=29 |issue=9 |pages=2994–3011 |doi=10.1108/HFF-11-2018-0659 |s2cid=198459648 |issn=0961-5539}}</ref> |
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==Thermal composites== |
==Thermal composites== |
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''Thermal composites'' is a term given to combinations of phase change materials (PCMs) and other (usually solid) structures. A simple example is a copper mesh immersed in paraffin wax. The copper mesh within paraffin wax can be considered a composite material, dubbed a thermal composite. Such hybrid materials are created to achieve specific overall or bulk properties (an example being the encapsulation of paraffin into distinct silicon dioxide nanospheres for increased surface area-to-volume ratio and, thus, higher heat transfer speeds <ref>{{cite journal |last1=Belessiotis |first1=George |last2=Papadokostaki |first2=Kyriaki |last3=Favvas |first3=Evangelos |last4=Efthimiadou |first4=Eleni |last5=Karellas |first5=Sotirios |date=2018 |title=Preparation and investigation of distinct and shape stable paraffin/SiO2 |
''Thermal composites'' is a term given to combinations of phase change materials (PCMs) and other (usually solid) structures. A simple example is a copper mesh immersed in paraffin wax. The copper mesh within paraffin wax can be considered a composite material, dubbed a thermal composite. Such hybrid materials are created to achieve specific overall or bulk properties (an example being the encapsulation of paraffin into distinct silicon dioxide nanospheres for increased surface area-to-volume ratio and, thus, higher heat transfer speeds <ref>{{cite journal |last1=Belessiotis |first1=George |last2=Papadokostaki |first2=Kyriaki |last3=Favvas |first3=Evangelos |last4=Efthimiadou |first4=Eleni |last5=Karellas |first5=Sotirios |date=2018 |title=Preparation and investigation of distinct and shape stable paraffin/SiO2 composite PCM nanospheres |url=https://www.sciencedirect.com/science/article/abs/pii/S0196890418304072 |journal=Energy Conversion and Management |volume=168 |pages=382–394 |doi=10.1016/j.enconman.2018.04.059 |s2cid=102779105 }}</ref>). |
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composite PCM nanospheres |url=https://www.sciencedirect.com/science/article/abs/pii/S0196890418304072 |journal=Energy Conversion and Management |volume=168 |pages=382-394 |doi=10.1016/j.enconman.2018.04.059 }}</ref>). |
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Thermal conductivity is a common property targeted for maximization by creating thermal composites. In this case, the basic idea is to increase thermal conductivity by adding a highly conducting solid (such as the copper mesh or graphite<ref>{{cite journal |last1=Gorbacheva |first1=Svetlana N. |last2=Makarova |first2=Veronika V. |last3=Ilyin |first3=Sergey O. |date=April 2021 |title=Hydrophobic nanosilica-stabilized graphite particles for improving thermal conductivity of paraffin wax-based phase-change materials |url=https://linkinghub.elsevier.com/retrieve/pii/S2352152X21001705 |journal=Journal of Energy Storage |language=en |volume=36 |pages=102417 |doi=10.1016/j.est.2021.102417|s2cid=233608864 }}</ref>) into the relatively low-conducting PCM, thus increasing overall or bulk (thermal) conductivity.<ref>{{cite journal |last1=Makarova |first1=V. V. |last2=Gorbacheva |first2=S. N. |last3=Antonov |first3=S. V. |last4=Ilyin |first4=S. O. |date=December 2020 |title=On the Possibility of a Radical Increase in Thermal Conductivity by Dispersed Particles |url=http://link.springer.com/10.1134/S1070427220120022 |journal=Russian Journal of Applied Chemistry |language=en |volume=93 |issue=12 |pages=1796–1814 |doi=10.1134/S1070427220120022 |s2cid=232061261 |issn=1070-4272}}</ref> If the PCM is required to flow, the solid must be porous, such as a mesh. |
Thermal conductivity is a common property targeted for maximization by creating thermal composites. In this case, the basic idea is to increase thermal conductivity by adding a highly conducting solid (such as the copper mesh or graphite<ref>{{cite journal |last1=Gorbacheva |first1=Svetlana N. |last2=Makarova |first2=Veronika V. |last3=Ilyin |first3=Sergey O. |date=April 2021 |title=Hydrophobic nanosilica-stabilized graphite particles for improving thermal conductivity of paraffin wax-based phase-change materials |url=https://linkinghub.elsevier.com/retrieve/pii/S2352152X21001705 |journal=Journal of Energy Storage |language=en |volume=36 |pages=102417 |doi=10.1016/j.est.2021.102417|s2cid=233608864 }}</ref>) into the relatively low-conducting PCM, thus increasing overall or bulk (thermal) conductivity.<ref>{{cite journal |last1=Makarova |first1=V. V. |last2=Gorbacheva |first2=S. N. |last3=Antonov |first3=S. V. |last4=Ilyin |first4=S. O. |date=December 2020 |title=On the Possibility of a Radical Increase in Thermal Conductivity by Dispersed Particles |url=http://link.springer.com/10.1134/S1070427220120022 |journal=Russian Journal of Applied Chemistry |language=en |volume=93 |issue=12 |pages=1796–1814 |doi=10.1134/S1070427220120022 |s2cid=232061261 |issn=1070-4272}}</ref> If the PCM is required to flow, the solid must be porous, such as a mesh. |
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Applications<ref name="Kenisarin"/><ref>{{cite journal |doi=10.1016/j.rser.2006.07.010 |title=Renewable building energy systems and passive human comfort solutions |year=2008 |last1=Omer |first1=A |journal=Renewable and Sustainable Energy Reviews |volume=12 |issue=6 |pages=1562–1587}}</ref> of phase change materials include, but are not limited to: |
Applications<ref name="Kenisarin"/><ref>{{cite journal |doi=10.1016/j.rser.2006.07.010 |title=Renewable building energy systems and passive human comfort solutions |year=2008 |last1=Omer |first1=A |journal=Renewable and Sustainable Energy Reviews |volume=12 |issue=6 |pages=1562–1587}}</ref> of phase change materials include, but are not limited to: |
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* [[Thermal energy storage]] |
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* [[Thermal energy storage]], such as the FlexTherm Eco<ref>{{cite web |url= https://flamcogroup.com/uk-en/catalog/buffering-and-water-heating/thermal-batteries/groups/g+c+view/ |title= FlexTherm Eco, Flamco (Aalberts hydronic flow control)|website=www.Flamco.com |access-date=November 20, 2021}}</ref> by Flamco. |
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* Solar cooking |
* Solar cooking |
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* [[Cold Energy Battery]] |
* [[Cold Energy Battery]] |
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* Cooling of heat and electrical engines |
* Cooling of heat and electrical engines |
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* Cooling: food, beverages, coffee, wine, milk products, green houses |
* Cooling: food, beverages, coffee, wine, milk products, green houses |
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*Delaying ice and frost formation on surfaces<ref name="auto">{{cite journal |last1=Chatterjee |first1=Rukmava |last2=Beysens |first2=Daniel |last3=Anand |first3=Sushant |title=Delaying Ice and Frost Formation Using Phase-Switching Liquids |journal=Advanced Materials |language=en |issue=17 |pages=1807812 |doi=10.1002/adma.201807812 |pmid=30873685 |issn=1521-4095 |year=2019 |volume=31 |doi-access= |
*Delaying ice and frost formation on surfaces<ref name="auto">{{cite journal |last1=Chatterjee |first1=Rukmava |last2=Beysens |first2=Daniel |last3=Anand |first3=Sushant |title=Delaying Ice and Frost Formation Using Phase-Switching Liquids |journal=Advanced Materials |language=en |issue=17 |pages=1807812 |doi=10.1002/adma.201807812 |pmid=30873685 |issn=1521-4095 |year=2019 |volume=31 |bibcode=2019AdM....3107812C |doi-access=}}</ref> |
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* Medical applications: transportation of blood, operating tables, hot-cold therapies, treatment of [[birth asphyxia]]{{cite news |url=https://economictimes.indiatimes.com/news/science/how-two-low-cost-made-in-india-innovations-miracradle-embrace-nest-are-helping-save-the-lives-of-newborns/articleshow/48310144.cms |title=How two low-cost, made-in-India innovations MiraCradle & Embrace Nest are helping save the lives of newborns |work=timesofindia-economictimes |date=2015-08-02 |last1=Aravind |first1=Indulekha |last2=Kumar |first2=KP Narayana}}</ref><ref>{{cite web |url=https://miracradle.com/ |title=MiraCradle - Neonate Cooler |website=miracradle.com}}</ref> |
* Medical applications: transportation of blood, operating tables, hot-cold therapies, treatment of [[birth asphyxia]]<ref>{{cite news |url=https://economictimes.indiatimes.com/news/science/how-two-low-cost-made-in-india-innovations-miracradle-embrace-nest-are-helping-save-the-lives-of-newborns/articleshow/48310144.cms |title=How two low-cost, made-in-India innovations MiraCradle & Embrace Nest are helping save the lives of newborns |work=timesofindia-economictimes |date=2015-08-02 |last1=Aravind |first1=Indulekha |last2=Kumar |first2=KP Narayana}}</ref><ref>{{cite web |url=https://miracradle.com/ |title=MiraCradle - Neonate Cooler |website=miracradle.com}}</ref> |
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* Human body cooling under bulky clothing or costumes. |
* Human body cooling under bulky clothing or costumes. |
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* [[Waste heat]] recovery |
* [[Waste heat]] recovery |
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* [[Off-peak]] power utilization: Heating hot water and Cooling |
* [[peak demand|Off-peak]] power utilization: Heating hot water and Cooling |
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* [[Heat pump]] systems |
* [[Heat pump]] systems |
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* Passive storage in [[bioclimatic building]]/architecture ([[high-density polyethylene|HDPE]], paraffin) |
* Passive storage in [[bioclimatic building]]/architecture ([[high-density polyethylene|HDPE]], paraffin) |
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==Further reading== |
==Further reading== |
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* {{cite journal |last1=Raoux |first1=S. |doi=10.1146/annurev-matsci-082908-145405 |title=Phase Change Materials |journal=[[Annual Review of Materials Research]] |volume=39 |pages=25–48 |year=2009 |bibcode=2009AnRMS..39...25R}} |
* {{cite journal |last1=Raoux |first1=S. |doi=10.1146/annurev-matsci-082908-145405 |title=Phase Change Materials |journal=[[Annual Review of Materials Research]] |volume=39 |pages=25–48 |year=2009 |bibcode=2009AnRMS..39...25R|s2cid=137035578 }} |
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* [ |
* [https://puretemp.com/?p=382 Phase Change Matters] (industry blog) |
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{{Authority control}} |
{{Authority control}} |
Aphase-change material (PCM) is a substance which releases/absorbs sufficient energy at phase transition to provide useful heat or cooling. Generally the transition will be from one of the first two fundamental states of matter - solid and liquid - to the other. The phase transition may also be between non-classical states of matter, such as the conformity of crystals, where the material goes from conforming to one crystalline structure to conforming to another, which may be a higher or lower energy state.
The energy released/absorbed by phase transition from solid to liquid, or vice versa, the heat of fusion is generally much higher than the sensible heat. Ice, for example, requires 333.55 J/g to melt, but then water will rise one degree further with the addition of just 4.18 J/g. Water/ice is therefore a very useful phase change material and has been used to store winter cold to cool buildings in summer since at least the time of the Achaemenid Empire.
By melting and solidifying at the phase-change temperature (PCT), a PCM is capable of storing and releasing large amounts of energy compared to sensible heat storage. Heat is absorbed or released when the material changes from solid to liquid and vice versa or when the internal structure of the material changes; PCMs are accordingly referred to as latent heat storage (LHS) materials.
There are two principal classes of phase-change material: organic (carbon-containing) materials derived either from petroleum, from plants or from animals; and salt hydrates, which generally either use natural salts from the sea or from mineral deposits or are by-products of other processes. A third class is solid to solid phase change.
PCMs are used in many different commercial applications where energy storage and/or stable temperatures are required, including, among others, heating pads, cooling for telephone switching boxes, and clothing.
By far the biggest potential market is for building heating and cooling. In this application area, PCMs hold potential in light of the progressive reduction in the cost of renewable electricity, coupled with the intermittent nature of such electricity. This can result in a misfit between peak demand and availability of supply. In North America, China, Japan, Australia, Southern Europe and other developed countries with hot summers, peak supply is at midday while peak demand is from around 17:00 to 20:00. This creates opportunities for thermal storage media.
Solid-liquid phase-change materials are usually encapsulated for installation in the end application, to contain in the liquid state. In some applications, especially when incorporation to textiles is required, phase change materials are micro-encapsulated. Micro-encapsulation allows the material to remain solid, in the form of small bubbles, when the PCM core has melted.
Latent heat storage can be achieved through changes in the state of matter from liquid→solid, solid→liquid, solid→gas and liquid→gas. However, only solid→liquid and liquid→solid phase changes are practical for PCMs. Although liquid–gas transitions have a higher heat of transformation than solid–liquid transitions, liquid→gas phase changes are impractical for thermal storage because large volumes or high pressures are required to store the materials in their gas phase. Solid–solid phase changes are typically very slow and have a relatively low heat of transformation.
Initially, solid–liquid PCMs behave like sensible heat storage (SHS) materials; their temperature rises as they absorb heat. Unlike conventional SHS materials, however, when PCMs reach their phase change temperature (their melting point) they absorb large amounts of heat at an almost constant temperature until all the material is melted. When the ambient temperature around a liquid material falls, the PCM solidifies, releasing its stored latent heat. A large number of PCMs are available in any required temperature range from −5 up to 190 °C.[1] Within the human comfort range between 20 and 30 °C, some PCMs are very effective, storing over 200 kJ/kg of latent heat, as against a specific heat capacity of around one kJ/(kg*°C) for masonry. The storage density can therefore be 20 times greater than masonry per kg if an temperature swing of 10 °C is allowed.[2] However, since the mass of the masonry is far higher than that of PCM this specific (per mass) heat capacity is somewhat offset. A masonry wall might have a mass of 200 kg/m2, so to double the heat capacity one would require additional 10 kg/m2 of PCM.
Hydrocarbons, primarily paraffins (CnH2n+2) and lipids but also sugar alcohols.[4][5][6]
Salt hydrates (MxNy·nH2O)[9]
Many natural building materials are hygroscopic, that is they can absorb (water condenses) and release water (water evaporates). The process is thus:
While this process liberates a small quantity of energy, large surfaces area allows significant (1–2 °C) heating or cooling in buildings. The corresponding materials are wool insulation and earth/clay render finishes.
A specialised group of PCMs that undergo a solid/solid phase transition with the associated absorption and release of large amounts of heat. These materials change their crystalline structure from one lattice configuration to another at a fixed and well-defined temperature, and the transformation can involve latent heats comparable to the most effective solid/liquid PCMs. Such materials are useful because, unlike solid/liquid PCMs, they do not require nucleation to prevent supercooling. Additionally, because it is a solid/solid phase change, there is no visible change in the appearance of the PCM, and there are no problems associated with handling liquids, e.g. containment, potential leakage, etc. Currently the temperature range of solid-solid PCM solutions spans from -50 °C (-58 °F) up to +175 °C (347 °F).[15]
The phase change material should possess the following thermodynamic properties:[16]
Kinetic properties
Chemical properties
Economic properties
Key thermophysical properties of phase-change materials include: Melting point (Tm), Heat of fusion (ΔHfus), Specific heat (cp) (of solid and liquid phase), Density (ρ) (of solid and liquid phase) and thermal conductivity. Values such as volume change and volumetric heat capacity can be calculated there from.
The most commonly used PCMs are salt hydrates, fatty acids and esters, and various paraffins (such as octadecane). Recently also ionic liquids were investigated as novel PCMs.
As most of the organic solutions are water-free, they can be exposed to air, but all salt based PCM solutions must be encapsulated to prevent water evaporation or uptake. Both types offer certain advantages and disadvantages and if they are correctly applied some of the disadvantages becomes an advantage for certain applications.
They have been used since the late 19th century as a medium for thermal storage applications. They have been used in such diverse applications as refrigerated transportation[17] for rail[18] and road applications[19] and their physical properties are, therefore, well known.
Unlike the ice storage system, however, the PCM systems can be used with any conventional water chiller both for a new or alternatively retrofit application. The positive temperature phase change allows centrifugal and absorption chillers as well as the conventional reciprocating and screw chiller systems or even lower ambient conditions utilizing a cooling tower or dry cooler for charging the TES system.
The temperature range offered by the PCM technology provides a new horizon for the building services and refrigeration engineers regarding medium and high temperature energy storage applications. The scope of this thermal energy application is wide-ranging of solar heating, hot water, heating rejection (i.e., cooling tower), and dry cooler circuitry thermal energy storage applications.
Since PCMs transform between solid–liquid in thermal cycling, encapsulation[20] naturally became the obvious storage choice.
As phase change materials perform best in small containers, therefore they are usually divided in cells. The cells are shallow to reduce static head – based on the principle of shallow container geometry. The packaging material should conduct heat well; and it should be durable enough to withstand frequent changes in the storage material's volume as phase changes occur. It should also restrict the passage of water through the walls, so the materials will not dry out (or water-out, if the material is hygroscopic). Packaging must also resist leakage and corrosion. Common packaging materials showing chemical compatibility with room temperature PCMs include stainless steel, polypropylene, and polyolefin.
Nanoparticles such as carbon nanotubes, graphite, graphene, metal and metal oxide can be dispersed in PCM. It is worth noting that inclusion of nanoparticles will not only alter thermal conductivity characteristic of PCM but also other characteristics as well, including latent heat capacity, sub-cooling, phase change temperature and its duration, density and viscosity. The new group of PCMs called NePCM.[21] NePCMs can be added to metal foams to build even higher thermal conductive combination.[22]
Thermal composites is a term given to combinations of phase change materials (PCMs) and other (usually solid) structures. A simple example is a copper mesh immersed in paraffin wax. The copper mesh within paraffin wax can be considered a composite material, dubbed a thermal composite. Such hybrid materials are created to achieve specific overall or bulk properties (an example being the encapsulation of paraffin into distinct silicon dioxide nanospheres for increased surface area-to-volume ratio and, thus, higher heat transfer speeds [23]).
Thermal conductivity is a common property targeted for maximization by creating thermal composites. In this case, the basic idea is to increase thermal conductivity by adding a highly conducting solid (such as the copper mesh or graphite[24]) into the relatively low-conducting PCM, thus increasing overall or bulk (thermal) conductivity.[25] If the PCM is required to flow, the solid must be porous, such as a mesh.
Solid composites such as fiberglass or kevlar prepreg for the aerospace industry usually refer to a fiber (the kevlar or the glass) and a matrix (the glue, which solidifies to hold fibers and provide compressive strength). A thermal composite is not so clearly defined but could similarly refer to a matrix (solid) and the PCM, which is of course usually liquid and/or solid depending on conditions. They are also meant to discover minor elements in the earth.
Applications[1][26] of phase change materials include, but are not limited to:
Some phase change materials are suspended in water, and are relatively nontoxic. Others are hydrocarbons or other flammable materials, or are toxic. As such, PCMs must be selected and applied very carefully, in accordance with fire and building codes and sound engineering practices. Because of the increased fire risk, flamespread, smoke, potential for explosion when held in containers, and liability, it may be wise not to use flammable PCMs within residential or other regularly occupied buildings. Phase change materials are also being used in thermal regulation of electronics.
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