Phase-change material

<h2 id="characteristics-and-classification">Characteristics and classification</h2>
Latent heat storage can be achieved through changes in the <a href="/facts/State_of_matter/ojlIA1UF">state of matter</a> 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 <a href="/facts/Sensible_heat/VRytSLvb">sensible heat</a> storage (SHS) materials; their temperature rises as they absorb heat. 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.<a class="footnote-ref" id="fnref:1" href="#fn:1">1</a> 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 a temperature swing of 10 °C is allowed.<a class="footnote-ref" id="fnref:2" href="#fn:2">2</a> 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.

<h3>Organic PCMs</h3>
Hydrocarbons, primarily paraffins (CnH2n+2) and lipids but also sugar alcohols.<a class="footnote-ref" id="fnref:3" href="#fn:3">3</a><a class="footnote-ref" id="fnref:4" href="#fn:4">4</a><a class="footnote-ref" id="fnref:5" href="#fn:5">5</a>

<ul><li>Advantages
<ul><li>Freeze without much supercooling</li>
<li>Ability to melt congruently</li>
<li>Self-nucleating properties</li>
<li>Compatibility with conventional material of construction</li>
<li>No segregation</li>
<li>Chemically stable</li>
<li>Safe and non-reactive</li></ul></li>
<li>Disadvantages
<ul><li>Low thermal conductivity in their solid state. High heat transfer rates are required during the freezing cycle. Nano composites were found to yield an effective thermal conductivity increase up to 216%.<a class="footnote-ref" id="fnref:6" href="#fn:6">6</a><a class="footnote-ref" id="fnref:7" href="#fn:7">7</a></li>
<li>Volumetric latent heat storage capacity can be low</li>
<li>Flammable. This can be partially alleviated by specialized containment.</li></ul></li></ul>
<h3>Inorganic</h3>
Salt hydrates (MxNy·nH2O)<a class="footnote-ref" id="fnref:8" href="#fn:8">8</a>

<ul><li>Advantages
<ul><li>High volumetric latent heat storage capacity</li>
<li>Availability and low cost</li>
<li>Sharp melting point</li>
<li>High thermal conductivity</li>
<li>High heat of fusion</li>
<li>Non-flammable</li>
<li>Sustainability</li></ul></li>
<li>Disadvantages
<ul><li>Difficult to prevent <a href="/facts/Incongruent_melting/19gV5W3b">incongruent melting</a> and phase separation upon cycling, which can cause a significant loss in latent heat enthalpy.<a class="footnote-ref" id="fnref:9" href="#fn:9">9</a></li>
<li>Can be corrosive to many other materials, such as metals.<a class="footnote-ref" id="fnref:10" href="#fn:10">10</a><a class="footnote-ref" id="fnref:11" href="#fn:11">11</a><a class="footnote-ref" id="fnref:12" href="#fn:12">12</a> This can be overcome by only using specific metal-PCM pairings or encapsulation in small quantities in non-reactive plastic.</li>
<li>Change of volume is very high in some mixtures</li>
<li>Super cooling can be a problem in solid–liquid transition, necessitating the use of nucleating agents which may become inoperative after repeated cycling</li></ul></li></ul>

<h3>Hygroscopic materials</h3>
Many natural building materials are hygroscopic, that is they can absorb (water condenses) and release water (water evaporates). The process is thus:

<ul><li>Condensation (gas to liquid) ΔH<0; enthalpy decreases (exothermic process) gives off heat.</li>
<li>Vaporization (liquid to gas) ΔH>0; enthalpy increases (endothermic process) absorbs heat (or cools).</li></ul>
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.

<h3>Solid-solid PCMs</h3>
A specialized 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).<a class="footnote-ref" id="fnref:13" href="#fn:13">13</a><a class="footnote-ref" id="fnref:14" href="#fn:14">14</a> Therefore, these materials have emerged as promising alternatives to traditional solid/liquid PCMs due to their ability to undergo phase transitions without liquefaction. This property eliminates the risk of leakage and enhances material stability, For example, SSPCMs include polymer-based materials such as <a href="/facts/Polyethylene_glycol/tC7xBFwr">polyethylene glycol</a> and <a href="/facts/Metal%25E2%2580%2593organic_framework/gwE4bkCa">metal-organic frameworks</a> (MOFs). In addition, SSPCMs have been explored for use in smart textiles, electronics cooling systems, and thermally adaptive building materials. Research efforts continue to optimize their thermal storage density and improve long-term cycling stability, supporting broader commercial applications. In particular, integrating SSPCMs with nanostructured material and composite frameworks is being investigated to enhance their thermal conductivity and phase transition kinetics.

<h2 id="selection-criteria">Selection criteria</h2>
The phase change material should possess the following thermodynamic properties:<a class="footnote-ref" id="fnref:15" href="#fn:15">15</a>

<ul><li>Melting temperature in the desired <a href="/facts/Operating_temperature/vhFQTpkF">operating temperature</a> range</li>
<li>High latent heat of fusion per unit volume</li>
<li>High specific heat, high density, and high thermal conductivity</li>
<li>Small volume changes on phase transformation and small vapor pressure at operating temperatures to reduce the containment problem</li>
<li>Congruent melting</li></ul>
Kinetic properties

<ul><li>High nucleation rate to avoid supercooling of the liquid phase</li>
<li>High rate of crystal growth, so that the system can meet demands of heat recovery from the storage system</li></ul>
Chemical properties

<ul><li>Chemical stability</li>
<li>Complete reversible freeze/melt cycle</li>
<li>No degradation after a large number of freeze/melt cycle</li>
<li>Non-corrosiveness, non-toxic, non-flammable and non-explosive materials</li></ul>
Economic properties

<ul><li>Low cost</li>
<li>Availability</li></ul>
<h2 id="thermophysical-properties">Thermophysical properties</h2>
Key thermophysical properties of phase-change materials include: <a href="/facts/Melting_point/MY0w0h0k">Melting point (Tm)</a>, <a href="/facts/Enthalpy_of_fusion/eLJIURcp">Heat of fusion (ΔHfus)</a>, <a href="/facts/Specific_heat_capacity/9P0U6YgI">Specific heat (cp)</a> (of solid and liquid phase), <a href="/facts/Density/92p6hh9I">Density (ρ)</a> (of solid and liquid phase) and <a href="/facts/Thermal_conductivity/qWnSG3nQ">thermal conductivity</a>. The thermal properties of representative PCMs are shown below.<a class="footnote-ref" id="fnref:16" href="#fn:16">16</a><a class="footnote-ref" id="fnref:17" href="#fn:17">17</a> Values such as volume change and <a href="/facts/Volumetric_heat_capacity/utfQ52xj">volumetric heat capacity</a> can be calculated there from. One major challenge is the inherently low thermal conductivity of many PCMs, which limits their heat transfer efficiency. To address this problem, high thermal conductivity additives such as <a href="/facts/Carbon_nanotube/atuDPPaG">carbon nanotube</a>, <a href="/facts/Graphene/QDGUBaPt">graphene</a>, and metallic nanoparticles have been introduced to enhance their performance. Another critical issue is supercooling, where the PCM remains in a liquid state below its freezing point. Solutions such as nucleating agents and <a href="/facts/Encapsulation/mwMpATYS">encapsulation</a> techniques have been developed to mitigate this effect. Additionally, volume expansion during phase transitions can impact material stability, necessitating advanced structural designs and containment strategies. Recent studies have also explored nano-enhanced PCMs and composite structures to further optimize thermal response times and cycling stability.<a class="footnote-ref" id="fnref:18" href="#fn:18">18</a><a class="footnote-ref" id="fnref:19" href="#fn:19">19</a> This nano-enhanced PCMs, particularly those incorporating metal foams, have been shown to enhance thermal conductivity, improving their efficiency in thermal management applications.

<table><tbody><tr><th>PCM type</th><th>Material</th><th>Melting point (°C)</th><th>Latent heat (kJ/kg)</th><th>Thermal conductivity (W/m・K)</th></tr><tr><td>Organic PCMs</td><td>Paraffin Wax</td><td>20-70</td><td>150-250</td><td>0.2-0.4</td></tr><tr><td></td><td>Fatty Acids</td><td>20-70</td><td>150-200</td><td>0.2-0.3</td></tr><tr><td>Inorganic PCMs</td><td>Hydrated salts</td><td>30-120</td><td>200-350</td><td>0.5-1.2</td></tr><tr><td></td><td>Metallic PCMs</td><td>30-1000</td><td>100-300</td><td>10-50</td></tr><tr><td></td><td>Eutectic salts</td><td>50-250</td><td>100-250</td><td>0.5-2.0</td></tr><tr><td>Solid-solid PCMs</td><td>Graphene-enhanced PCMs</td><td>30-150</td><td>150-350</td><td>1.0-10.0</td></tr></tbody></table>
<h2 id="technology-development-and-encapsulation">Technology, development, and encapsulation</h2>
The most commonly used PCMs are salt <a href="/facts/Hydrate/dev82l69">hydrates</a>, <a href="/facts/Fatty_acid/JGg3erIu">fatty acids</a> and <a href="/facts/Ester/FoUAIIw4">esters</a>, and various <a href="/facts/Alkane/Qam7Hvmf">paraffins</a> (such as <a href="/facts/Octadecane/jux1B6s2">octadecane</a>). Recently also <a href="/facts/Ionic_liquid/Ypse8taj">ionic liquids</a> 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 <a href="/facts/Thermal_storage/t7qMtkeo">thermal storage</a> applications. They have been used in such diverse applications as refrigerated transportation<a class="footnote-ref" id="fnref:20" href="#fn:20">20</a> for rail<a class="footnote-ref" id="fnref:21" href="#fn:21">21</a> and road applications<a class="footnote-ref" id="fnref:22" href="#fn:22">22</a> and their physical properties are, therefore, well known.
Unlike the ice storage system, however, the PCM systems can be used with any conventional water <a href="/facts/Chiller/DpdaocSf">chiller</a> 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 <a href="/facts/Cooling_tower/rnTgbsSA">cooling tower</a> 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<a class="footnote-ref" id="fnref:23" href="#fn:23">23</a> naturally became the obvious storage choice.

<ul><li>Encapsulation of PCMs
<ul><li>Macro-encapsulation: Early development of macro-encapsulation with large volume containment failed due to the poor <a href="/facts/Thermal_conductivity/qWnSG3nQ">thermal conductivity</a> of most PCMs. PCMs tend to solidify at the edges of the containers preventing effective heat transfer.</li>
<li>Micro-encapsulation: <a href="/facts/Micro-encapsulation/sRzQz1zd">Micro-encapsulation</a> on the other hand showed no such problem. It allows the PCMs to be incorporated into construction materials, such as <a href="/facts/Concrete/K6whGVNx">concrete</a>, easily and economically. Micro-encapsulated PCMs also provide a portable heat storage system. By coating a microscopic sized PCM with a protective coating, the particles can be <a href="/facts/Suspension_(chemistry)/S3xp96TL">suspended</a> within a continuous phase such as water. This system can be considered a phase change <a href="/facts/Slurry/erSTjthc">slurry</a> (PCS).</li>
<li>Molecular-encapsulation is another technology, developed by Dupont de Nemours that allows a very high concentration of PCM within a polymer compound. It allows storage capacity up to 515 <a href="/facts/Kilojoule/9ndq9jD2">kJ</a>/<a href="/facts/Square_metre/u5nT9y0W">m2</a> for a 5 <a href="/facts/Millimetre/25mdTXpa">mm</a> board (103 <a href="/facts/Megajoule/9ndq9jD2">MJ</a>/<a href="/facts/Cubic_metre/GPILKCtm">m3</a>). Molecular-encapsulation allows drilling and cutting through the material without any PCM leakage.</li></ul></li></ul>
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 <a href="/facts/Hygroscopic/1NBGewXv">hygroscopic</a>). Packaging must also resist leakage and <a href="/facts/Corrosion/lIC7H4we">corrosion</a>. Common packaging materials showing chemical compatibility with room temperature PCMs include <a href="/facts/Stainless_steel/IDdo8bEx">stainless steel</a>, <a href="/facts/Polypropylene/HM9PvoCz">polypropylene</a>, and <a href="/facts/Polyolefin/hWl2j3r0">polyolefin</a>.
<a href="/facts/Nanoparticle/k8kNxX4E">Nanoparticles</a> 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.<a class="footnote-ref" id="fnref:24" href="#fn:24">24</a> NePCMs can be added to metal foams to build even higher thermal conductive combination.<a class="footnote-ref" id="fnref:25" href="#fn:25">25</a>

<h2 id="thermal-composites">Thermal composites</h2>
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 <a class="footnote-ref" id="fnref:26" href="#fn:26">26</a>).
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<a class="footnote-ref" id="fnref:27" href="#fn:27">27</a>) into the relatively low-conducting PCM, thus increasing overall or bulk (thermal) conductivity.<a class="footnote-ref" id="fnref:28" href="#fn:28">28</a> 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.

<h2 id="photo-thermal-conversion-phase-change-composite-energy-storage-materials-ptcpcesms">Photo-thermal conversion phase-change composite energy storage materials (PTCPCESMs)</h2>
PTCPCESMs are composite phase change materials with photo-thermal materials. They have wide applications in various industries, owing to their high thermal conductivity, photo-thermal conversion efficiency, latent heat storage capacity, physicochemical stability, and energy saving effect.<a class="footnote-ref" id="fnref:29" href="#fn:29">29</a> 
PTCPCESMs mainly consist of functional carrier materials and organic PCMs. During the solid-liquid phase transition, organic PCMs can absorb and release a large amount of latent heat. Meanwhile, functional carrier materials not only enhance the stability and efficiency of photo-thermal conversion but also introduce various energy conversion functions.<a class="footnote-ref" id="fnref:30" href="#fn:30">30</a> The photo-thermal conversion is related to the band structure and other electric properties of photo-thermal materials, contributing to different absorbing solar spectrum. This is achieved using materials like carbon-based nanostructures (e.g., graphene, CNTs), plasmonic nanoparticles (e.g., Au, Ag), and semiconductors (e.g., TiO2, MoS2). Common PCMs include organic materials (paraffins, fatty acids) and inorganic materials (salt hydrates, metal alloys).
Researchers have been working on high-efficiency PTCPCESMs. A combined form of difunctional phase change composites integrated with phase change materials and photothermal conversion materials can reach 51.25% photothermal conversion efficiency and show no leakage under 60 °C for 24 h.<a class="footnote-ref" id="fnref:31" href="#fn:31">31</a> Some researchers synthesized a novel form-stable solar-thermal conversion and storage materials by incorporating amino-functionalized single-walled carbon nanotubes into a polyethyleneglycol based polyurethane PCM, and reached a solar thermal conversion and storage efficiency of 89.3%.<a class="footnote-ref" id="fnref:32" href="#fn:32">32</a>

<h2 id="recent-advances-in-phase-change-materials">Recent advances in phase-change materials</h2>
High-performance PCM development
Recent research has focused on enhancing the efficiency and stability of PCMs through material innovations. New organic-inorganic composite PCMs, such as paraffin-based microencapsulated systems and salt hydrates with enhanced <a href="/facts/Thermal_conductivity_and_resistivity/qWnSG3nQ">thermal conductivity</a>, have demonstrated improved energy storage capabilities.<a class="footnote-ref" id="fnref:33" href="#fn:33">33</a> In addition, <a href="/facts/Metal%25E2%2580%2593organic_framework/gwE4bkCa">metal-organic frameworks</a>(MOFs) has investigated as a potential PCM candidates due to their tunable phase transition properties and high thermal storage density.<a class="footnote-ref" id="fnref:34" href="#fn:34">34</a>
Applications in energy storage and management
PCMs have been increasingly utilized in energy storage systems, particularly in renewable energy applications. One promising approach is the integrations of PCMs into thermal energy storage units for solar and wind power systems.<a class="footnote-ref" id="fnref:35" href="#fn:35">35</a> By mitigating fluctuations in power generation, these materials enhance reliability of renewable energy sources. Furthermore, the incorporations of PCMs into <a href="/facts/Lithium-ion_battery/3L22xFhB">lithium-ion battery</a> systems has shown potential in managing thermal runaway, thereby improving battery safety and longevity.<a class="footnote-ref" id="fnref:36" href="#fn:36">36</a><a class="footnote-ref" id="fnref:37" href="#fn:37">37</a><a class="footnote-ref" id="fnref:38" href="#fn:38">38</a> Additionally PCM-enhanced smart windows and walls have been developed to regulate indoor temperatures and reduce building energy consumption by up to 30%.<a class="footnote-ref" id="fnref:39" href="#fn:39">39</a> PCM-integrated heat pump systems have also demonstrated significant savings in heating and cooling applications.
Challenges and future prospects
Despite their advantages, PCMs face several challenges that must be addressed for widespread implementation. One major limitations is their lower thermal conductivity, which can reduce heat transfer efficiency. To address the above challenge, efforts are underway to incorporate high-thermal-conductivity fillers such as <a href="/facts/Graphene/QDGUBaPt">graphene</a> and <a href="/facts/Carbon_nanotube/atuDPPaG">carbon nanotubes</a>.<a class="footnote-ref" id="fnref:40" href="#fn:40">40</a> Another concern is long-term stability of PCMs, as repeated phase transitions can lead to material degradation and phase separation. Encapsulation techniques and novel stabilizing additives are being developed to overcome these issues.<a class="footnote-ref" id="fnref:41" href="#fn:41">41</a> Looking forward, advancements in nano-enhanced PCMs and hybrid materials are expected to further expand their applications, making them integral to future energy-efficient technologies.

<h2 id="applications">Applications</h2>
Applications<a class="footnote-ref" id="fnref:42" href="#fn:42">42</a><a class="footnote-ref" id="fnref:43" href="#fn:43">43</a> of phase change materials include, but are not limited to:

<ul><li><a href="/facts/Thermal_energy_storage/t7qMtkeo">Thermal energy storage</a></li>
<li>Solar cooking</li>
<li><a href="/facts/Cold-energy_battery/Q6jHFXLF">Cold-energy battery</a></li>
<li><a href="/facts/HVAC/gm1UQdR6">Conditioning of buildings</a>, such as 'ice-storage'</li>
<li>Cooling of heat and electrical engines</li>
<li>Cooling: food, beverages, coffee, wine, milk products, green houses</li>
<li>Delaying ice and frost formation on surfaces<a class="footnote-ref" id="fnref:44" href="#fn:44">44</a></li>
<li>Medical applications: transportation of blood, operating tables, hot-cold therapies, treatment of <a href="/facts/Birth_asphyxia/uIBtsCf5">birth asphyxia</a><a class="footnote-ref" id="fnref:45" href="#fn:45">45</a><a class="footnote-ref" id="fnref:46" href="#fn:46">46</a></li>
<li>Human body cooling under bulky clothing or costumes.</li>
<li><a href="/facts/Waste_heat/nGBH1Vc8">Waste heat</a> recovery</li>
<li><a href="/facts/Peak_demand/rt93v6UJ">Off-peak</a> power utilization: Heating hot water and Cooling</li>
<li><a href="/facts/Heat_pump/JAprSmeL">Heat pump</a> systems</li>
<li>Passive storage in <a href="/facts/Bioclimatic_building/fG67vQCK">bioclimatic building</a>/architecture (<a href="/facts/High-density_polyethylene/9mUm98TQ">HDPE</a>, paraffin)</li>
<li>Smoothing <a href="/facts/Exothermic/gCuSvpa4">exothermic</a> temperature peaks in chemical reactions</li>
<li><a href="/facts/Solar_power/NpgmEbU2">Solar power</a> plants</li>
<li><a href="/facts/Spacecraft/YQqQaUw0">Spacecraft</a> thermal systems</li>
<li><a href="/facts/Thermal_comfort/IbnM7Mpj">Thermal comfort</a> in vehicles</li>
<li><a href="/facts/Thermal_protection/mlkyHKFX">Thermal protection</a> of electronic devices</li>
<li>Thermal protection of food: transport, hotel trade, ice-cream, etc.</li>
<li>Textiles used in clothing</li>
<li><a href="/facts/Computer_cooling/nG6gYYcm">Computer cooling</a></li>
<li>Turbine Inlet Chilling with thermal energy storage</li>
<li>Telecom shelters in tropical regions. They protect the high-value equipment in the shelter by keeping the indoor air temperature below the maximum permissible by absorbing heat generated by power-hungry equipment such as a <a href="/facts/Base_Station_Subsystem/aFl0pNva">Base Station Subsystem</a>. In case of a power failure to conventional cooling systems, PCMs minimize use of <a href="/facts/Diesel_generator/dR2LcP3I">diesel generators</a>, and this can translate into enormous savings across thousands of telecom sites in tropics.</li></ul>
<h2 id="fire-and-safety-issues">Fire and safety issues</h2>
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.

<h2 id="see-also">See also</h2>
<ul><li><a href="/facts/Heat_pipe/Fr8GoobY">Heat pipe</a></li></ul>

<h2 id="sources">Sources</h2>
<ul><li>Phase Change Material (PCM) Based Energy Storage Materials and Global Application Examples, Zafer URE M.Sc., C.Eng. MASHRAE <a href="https://www.pcmproducts.net/Building_Temperature_Control.htm">HVAC Applications</a></li>
<li>Phase Change Material Based Passive Cooling Systems Design Principal and Global Application Examples, Zafer URE M.Sc., C.Eng. MASHRAE <a href="https://www.pcmproducts.net/Passive_Enclosure_Cooling.htm">Passive Cooling Application</a></li></ul>
<h2 id="further-reading">Further reading</h2>
<ul><li>Raoux, S. (2009). "Phase Change Materials". <a href="/facts/Annual_Review_of_Materials_Research/6XMesL7y">Annual Review of Materials Research</a>. 39: 25–48. <a href="/facts/Bibcode_(identifier)/9HtdQSGB">Bibcode</a>:<a href="https://ui.adsabs.harvard.edu/abs/2009AnRMS..39...25R">2009AnRMS..39...25R</a>. <a href="/facts/Doi_(identifier)/muM9Etpq">doi</a>:<a href="https://doi.org/10.1146%2Fannurev-matsci-082908-145405">10.1146/annurev-matsci-082908-145405</a>. <a href="/facts/S2CID_(identifier)/ldJsHa2Y">S2CID</a> <a href="https://api.semanticscholar.org/CorpusID:137035578">137035578</a>.</li>
<li><a href="https://puretemp.com/?p=382">Phase Change Matters</a> (industry blog)</li></ul>

<h2 id="references">References</h2>

<ol>
<li id="fn:1">Kenisarin, M; Mahkamov, K (2007). "Solar energy storage using phase change materials". Renewable and Sustainable –1965. 11 (9): 1913–1965. Bibcode:2007RSERv..11.1913K. doi:10.1016/j.rser.2006.05.005. <a href="/wiki/Bibcode_(identifier)" target="_blank">/wiki/Bibcode_(identifier)</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></li>
<li id="fn:2">Sharma, Atul; Tyagi, V.V.; Chen, C.R.; Buddhi, D. (2009). "Review on thermal energy storage with phase change materials and applications". Renewable and Sustainable Energy Reviews. 13 (2): 318–345. Bibcode:2009RSERv..13..318S. doi:10.1016/j.rser.2007.10.005. <a href="/wiki/Bibcode_(identifier)" target="_blank">/wiki/Bibcode_(identifier)</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></li>
<li id="fn:3">"Heat storage systems" Archived 2020-06-29 at the Wayback Machine (PDF) by Mary Anne White, brings a list of advantages and disadvantages of Paraffin heat storage. A more complete list can be found in 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. <a href="http://myweb.dal.ca/mawhite/3303/supplementals/Heat%20Storage%20Systems.pdf" target="_blank">http://myweb.dal.ca/mawhite/3303/supplementals/Heat%20Storage%20Systems.pdf</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></li>
<li id="fn:4">Floros, Michael C.; Kaller, Kayden L. C.; Poopalam, Kosheela D.; Narine, Suresh S. (2016-12-01). "Lipid derived diamide phase change materials for high temperature thermal energy storage". Solar Energy. 139: 23–28. Bibcode:2016SoEn..139...23F. doi:10.1016/j.solener.2016.09.032. <a href="/wiki/Bibcode_(identifier)" target="_blank">/wiki/Bibcode_(identifier)</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></li>
<li id="fn:5">Agyenim, Francis; Eames, Philip; Smyth, Mervyn (2011-01-01). "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". Renewable Energy. 36 (1): 108–117. doi:10.1016/j.renene.2010.06.005. <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></li>
<li id="fn:6">Fleishcher, A.S. (2014). "Improved heat recovery from paraffn-based phase change materials due to the presence of percolating graphene networks". Improved Heat Recovery from Paraffn-based Phase Change Materials Due to the Presence of Percolating Graphene Networks. 79: 324–333. <a href="#fnref:6" class="footnote-back-ref">↩</a></li>
<li id="fn:7">(2015). Thermal energy storage using phase change materials: fundamentals and applications. Springer <a href="#fnref:7" class="footnote-back-ref">↩</a></li>
<li id="fn:8">"Phase Change Energy Solutions". Retrieved February 28, 2018. <a href="https://www.sciencedirect.com/topics/engineering/salt-hydrate" target="_blank">https://www.sciencedirect.com/topics/engineering/salt-hydrate</a> <a href="#fnref:8" class="footnote-back-ref">↩</a></li>
<li id="fn:9">Cantor, S. (1978). "DSC study of melting and solidification of salt hydrates". Thermochimica Acta. 26 (1–3): 39–47. doi:10.1016/0040-6031(78)80055-0. <a href="https://digital.library.unt.edu/ark:/67531/metadc1446857/" target="_blank">https://digital.library.unt.edu/ark:/67531/metadc1446857/</a> <a href="#fnref:9" class="footnote-back-ref">↩</a></li>
<li id="fn:10">olé, A.; Miró, L.; Barreneche, C.; Martorell, I.; Cabeza, L.F. (2015). "Corrosion of metals and salt hydrates used for thermochemical energy storage". Renewable Energy. 75: 519–523. Bibcode:2015REne...75..519S. doi:10.1016/j.renene.2014.09.059.[permanent dead link] <a href="https://zenodo.org/record/3422119" target="_blank">https://zenodo.org/record/3422119</a> <a href="#fnref:10" class="footnote-back-ref">↩</a></li>
<li id="fn:11">A. Sharma; V. Tyagi; C. Chen; D. Buddhi (February 2009). "Review on thermal energy storage with phase change materials and applications". Renewable and Sustainable Energy Reviews. 13 (2): 318–345. Bibcode:2009RSERv..13..318S. doi:10.1016/j.rser.2007.10.005. <a href="/wiki/Bibcode_(identifier)" target="_blank">/wiki/Bibcode_(identifier)</a> <a href="#fnref:11" class="footnote-back-ref">↩</a></li>
<li id="fn:12">Sharma, Someshower Dutt; Kitano, Hiroaki; Sagara, Kazunobu (2004). "Phase Change Materials for Low Temperature Solar Thermal Applications" (PDF). Res. Rep. Fac. Eng. Mie Univ. 29: 31–64. S2CID 17528226. Archived from the original (PDF) on 2020-06-27. <a href="https://web.archive.org/web/20200627085135/https://pdfs.semanticscholar.org/5492/cd76932f222b0bb74c5c5331aec45f879fbf.pdf" target="_blank">https://web.archive.org/web/20200627085135/https://pdfs.semanticscholar.org/5492/cd76932f222b0bb74c5c5331aec45f879fbf.pdf</a> <a href="#fnref:12" class="footnote-back-ref">↩</a></li>
<li id="fn:13">"Phase Change Energy Solutions PhaseStor". Phase Change Energy Solutions. Retrieved February 28, 2018. <a href="https://phasechange.com/phasestor/" target="_blank">https://phasechange.com/phasestor/</a> <a href="#fnref:13" class="footnote-back-ref">↩</a></li>
<li id="fn:14">"Webinar - Phase Change Materials for Decarbonization". GZ Module Pages. Retrieved 2024-09-10. <a href="https://members.naesco.org/calendar/details/webinar-phase-change-materials-for-decarbonization-1148701#:~:text=PCMs%20are%20now%20available%20in,%25,%20depending%20on%20the%20application." target="_blank">https://members.naesco.org/calendar/details/webinar-phase-change-materials-for-decarbonization-1148701#:~:text=PCMs%20are%20now%20available%20in,%25,%20depending%20on%20the%20application.</a> <a href="#fnref:14" class="footnote-back-ref">↩</a></li>
<li id="fn:15">Pasupathy, A; Velraj, R; Seeniraj, R (2008). "Phase change material-based building architecture for thermal management in residential and commercial establishments". Renewable and Sustainable Energy Reviews. 12 (1): 39–64. Bibcode:2008RSERv..12...39P. doi:10.1016/j.rser.2006.05.010. <a href="/wiki/Bibcode_(identifier)" target="_blank">/wiki/Bibcode_(identifier)</a> <a href="#fnref:15" class="footnote-back-ref">↩</a></li>
<li id="fn:16">Kenisarin, Murat; Mahkamov, Khamid (2007-12-01). "Solar energy storage using phase change materials". Renewable and Sustainable Energy Reviews. 11 (9): 1913–1965. doi:10.1016/j.rser.2006.05.005. ISSN 1364-0321. <a href="https://linkinghub.elsevier.com/retrieve/pii/S1364032106000633" target="_blank">https://linkinghub.elsevier.com/retrieve/pii/S1364032106000633</a> <a href="#fnref:16" class="footnote-back-ref">↩</a></li>
<li id="fn:17">Zhu, Qiang; Ong, Pin Jin; Goh, Si Hui Angela; Yeo, Reuben J.; Wang, Suxi; Liu, Zhiyuan; Loh, Xian Jun (2024-04-01). "Recent advances in graphene-based phase change composites for thermal energy storage and management". Nano Materials Science. 6 (2): 115–138. doi:10.1016/j.nanoms.2023.09.003. ISSN 2589-9651. <a href="https://linkinghub.elsevier.com/retrieve/pii/S2589965123000387" target="_blank">https://linkinghub.elsevier.com/retrieve/pii/S2589965123000387</a> <a href="#fnref:17" class="footnote-back-ref">↩</a></li>
<li id="fn:18">Punniakodi, Banumathi Munuswamy Swami; Senthil, Ramalingam (2022-05-01). "Recent developments in nano-enhanced phase change materials for solar thermal storage". Solar Energy Materials and Solar Cells. 238: 111629. Bibcode:2022SEMSC.23811629P. doi:10.1016/j.solmat.2022.111629. ISSN 0927-0248. <a href="https://linkinghub.elsevier.com/retrieve/pii/S0927024822000526" target="_blank">https://linkinghub.elsevier.com/retrieve/pii/S0927024822000526</a> <a href="#fnref:18" class="footnote-back-ref">↩</a></li>
<li id="fn:19">Omara, Z. M.; Ahmed, Mohamed M. Z.; Alawee, Wissam H.; Shanmugan, S.; Elashmawy, Mohamed (2024-06-01). "A comprehensive review of nano-enhanced phase change materials on solar stills with scientometric analysis". Results in Engineering. 22: 102088. doi:10.1016/j.rineng.2024.102088. ISSN 2590-1230. <a href="https://linkinghub.elsevier.com/retrieve/pii/S2590123024003426" target="_blank">https://linkinghub.elsevier.com/retrieve/pii/S2590123024003426</a> <a href="#fnref:19" class="footnote-back-ref">↩</a></li>
<li id="fn:20">Frederik Tudor the Ice King on ice transport during the 19th century <a href="https://hbswk.hbs.edu/archive/frederic-tudor-the-ice-king" target="_blank">https://hbswk.hbs.edu/archive/frederic-tudor-the-ice-king</a> <a href="#fnref:20" class="footnote-back-ref">↩</a></li>
<li id="fn:21">Richard Trevithick's steam locomotive ran in 1804 <a href="/wiki/Richard_Trevithick" target="_blank">/wiki/Richard_Trevithick</a> <a href="#fnref:21" class="footnote-back-ref">↩</a></li>
<li id="fn:22">Amédée Bollée created steam cars beginning at 1873 <a href="/wiki/Am%C3%A9d%C3%A9e_Boll%C3%A9e" target="_blank">/wiki/Am%C3%A9d%C3%A9e_Boll%C3%A9e</a> <a href="#fnref:22" class="footnote-back-ref">↩</a></li>
<li id="fn:23">Tyagi, Vineet Veer; Buddhi, D. (2007). "PCM thermal storage in buildings: A state of art". Renewable and Sustainable Energy Reviews. 11 (6): 1146–1166. Bibcode:2007RSERv..11.1146T. doi:10.1016/j.rser.2005.10.002. <a href="/wiki/Bibcode_(identifier)" target="_blank">/wiki/Bibcode_(identifier)</a> <a href="#fnref:23" class="footnote-back-ref">↩</a></li>
<li id="fn:24">Khodadadi, J. M.; Hosseinizadeh, S. F. (2007-05-01). "Nanoparticle-enhanced phase change materials (NEPCM) with great potential for improved thermal energy storage". International Communications in Heat and Mass Transfer. 34 (5): 534–543. Bibcode:2007ICHMT..34..534K. doi:10.1016/j.icheatmasstransfer.2007.02.005. ISSN 0735-1933. <a href="https://www.sciencedirect.com/science/article/pii/S0735193307000437" target="_blank">https://www.sciencedirect.com/science/article/pii/S0735193307000437</a> <a href="#fnref:24" class="footnote-back-ref">↩</a></li>
<li id="fn:25">Samimi Behbahan, Amin; Noghrehabadi, Aminreza; Wong, C.P.; Pop, Ioan; Behbahani-Nejad, Morteza (2019-01-01). "Investigation of enclosure aspect ratio effects on melting heat transfer characteristics of metal foam/phase change material composites". International Journal of Numerical Methods for Heat & Fluid Flow. 29 (9): 2994–3011. doi:10.1108/HFF-11-2018-0659. ISSN 0961-5539. S2CID 198459648. <a href="https://doi.org/10.1108/HFF-11-2018-0659" target="_blank">https://doi.org/10.1108/HFF-11-2018-0659</a> <a href="#fnref:25" class="footnote-back-ref">↩</a></li>
<li id="fn:26">Belessiotis, George; Papadokostaki, Kyriaki; Favvas, Evangelos; Efthimiadou, Eleni; Karellas, Sotirios (2018). "Preparation and investigation of distinct and shape stable paraffin/SiO2 composite PCM nanospheres". Energy Conversion and Management. 168: 382–394. doi:10.1016/j.enconman.2018.04.059. S2CID 102779105. <a href="https://www.sciencedirect.com/science/article/abs/pii/S0196890418304072" target="_blank">https://www.sciencedirect.com/science/article/abs/pii/S0196890418304072</a> <a href="#fnref:26" class="footnote-back-ref">↩</a></li>
<li id="fn:27">Gorbacheva, Svetlana N.; Makarova, Veronika V.; Ilyin, Sergey O. (April 2021). "Hydrophobic nanosilica-stabilized graphite particles for improving thermal conductivity of paraffin wax-based phase-change materials". Journal of Energy Storage. 36: 102417. Bibcode:2021JEnSt..3602417G. doi:10.1016/j.est.2021.102417. S2CID 233608864. <a href="https://linkinghub.elsevier.com/retrieve/pii/S2352152X21001705" target="_blank">https://linkinghub.elsevier.com/retrieve/pii/S2352152X21001705</a> <a href="#fnref:27" class="footnote-back-ref">↩</a></li>
<li id="fn:28">Makarova, V. V.; Gorbacheva, S. N.; Antonov, S. V.; Ilyin, S. O. (December 2020). "On the Possibility of a Radical Increase in Thermal Conductivity by Dispersed Particles". Russian Journal of Applied Chemistry. 93 (12): 1796–1814. doi:10.1134/S1070427220120022. ISSN 1070-4272. S2CID 232061261. <a href="http://link.springer.com/10.1134/S1070427220120022" target="_blank">http://link.springer.com/10.1134/S1070427220120022</a> <a href="#fnref:28" class="footnote-back-ref">↩</a></li>
<li id="fn:29">Chai, Zongce; Fang, Minghao; Min, Xin (2024-06-01). "Composite phase-change materials for photo-thermal conversion and energy storage：A review". Nano Energy. 124: 109437. Bibcode:2024NEne..12409437C. doi:10.1016/j.nanoen.2024.109437. ISSN 2211-2855. <a href="https://www.sciencedirect.com/science/article/abs/pii/S221128552400185X" target="_blank">https://www.sciencedirect.com/science/article/abs/pii/S221128552400185X</a> <a href="#fnref:29" class="footnote-back-ref">↩</a></li>
<li id="fn:30">Chai, Zongce; Fang, Minghao; Min, Xin (2024-06-01). "Composite phase-change materials for photo-thermal conversion and energy storage：A review". Nano Energy. 124: 109437. Bibcode:2024NEne..12409437C. doi:10.1016/j.nanoen.2024.109437. ISSN 2211-2855. <a href="https://www.sciencedirect.com/science/article/abs/pii/S221128552400185X" target="_blank">https://www.sciencedirect.com/science/article/abs/pii/S221128552400185X</a> <a href="#fnref:30" class="footnote-back-ref">↩</a></li>
<li id="fn:31">Chen, Weicheng; Liang, Xianghui; Fu, Wanwan; Wang, Shuangfeng; Gao, Xuenong; Zhang, Zhengguo; Fang, Yutang (2022-07-25). "Phase Change Composite with Core–Shell Structure for Photothermal Conversion and Thermal Energy Storage". ACS Applied Energy Materials. 5 (7): 9109–9117. doi:10.1021/acsaem.2c01608. <a href="https://pubs.acs.org/doi/10.1021/acsaem.2c01608?utm_source=chatgpt.com&" target="_blank">https://pubs.acs.org/doi/10.1021/acsaem.2c01608?utm_source=chatgpt.com&</a> <a href="#fnref:31" class="footnote-back-ref">↩</a></li>
<li id="fn:32">Du, Xiaosheng; Xu, Jianing; Deng, Sha; Du, Zongliang; Cheng, Xu; Wang, Haibo (2019-11-04). "Amino-Functionalized Single-Walled Carbon Nanotubes-Integrated Polyurethane Phase Change Composites with Superior Photothermal Conversion Efficiency and Thermal Conductivity". ACS Sustainable Chemistry & Engineering. 7 (21): 17682–17690. doi:10.1021/acssuschemeng.9b03853. <a href="https://pubs.acs.org/doi/epdf/10.1021/acssuschemeng.9b03853" target="_blank">https://pubs.acs.org/doi/epdf/10.1021/acssuschemeng.9b03853</a> <a href="#fnref:32" class="footnote-back-ref">↩</a></li>
<li id="fn:33">Skurkyte-Papieviene, Virginija; Abraitiene, Ausra; Sankauskaite, Audrone; Rubeziene, Vitalija; Baltusnikaite-Guzaitiene, Julija (January 2021). "Enhancement of the Thermal Performance of the Paraffin-Based Microcapsules Intended for Textile Applications". Polymers. 13 (7): 1120. doi:10.3390/polym13071120. ISSN 2073-4360. PMC 8037791. PMID 33915925. <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8037791" target="_blank">https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8037791</a> <a href="#fnref:33" class="footnote-back-ref">↩</a></li>
<li id="fn:34">McGillicuddy, Ryan D.; Thapa, Surendra; Wenny, Malia B.; Gonzalez, Miguel I.; Mason, Jarad A. (2020-11-11). "Metal–Organic Phase-Change Materials for Thermal Energy Storage". Journal of the American Chemical Society. 142 (45): 19170–19180. Bibcode:2020JAChS.14219170M. doi:10.1021/jacs.0c08777. ISSN 0002-7863. PMID 33135895. <a href="https://pubs.acs.org/doi/10.1021/jacs.0c08777" target="_blank">https://pubs.acs.org/doi/10.1021/jacs.0c08777</a> <a href="#fnref:34" class="footnote-back-ref">↩</a></li>
<li id="fn:35">Rashid, Farhan Lafta; Al-Obaidi, Mudhar A.; Dulaimi, Anmar; Bahlol, Haitham Y.; Hasan, Ala (June 2023). "Recent Advances, Development, and Impact of Using Phase Change Materials as Thermal Energy Storage in Different Solar Energy Systems: A Review". Designs. 7 (3): 66. doi:10.3390/designs7030066. ISSN 2411-9660. <a href="https://doi.org/10.3390%2Fdesigns7030066" target="_blank">https://doi.org/10.3390%2Fdesigns7030066</a> <a href="#fnref:35" class="footnote-back-ref">↩</a></li>
<li id="fn:36">Shi, Hong; Cheng, Mengmeng; Feng, Yi; Qiu, Chenghui; Song, Caiyue; Yuan, Nenglin; Kang, Chuanzhi; Yang, Kaijie; Yuan, Jie; Li, Yonghao (January 2023). "Thermal Management Techniques for Lithium-Ion Batteries Based on Phase Change Materials: A Systematic Review and Prospective Recommendations". Energies. 16 (2): 876. doi:10.3390/en16020876. ISSN 1996-1073. <a href="https://doi.org/10.3390%2Fen16020876" target="_blank">https://doi.org/10.3390%2Fen16020876</a> <a href="#fnref:36" class="footnote-back-ref">↩</a></li>
<li id="fn:37">Kumar, SR Shravan; Rao, G. Amba Prasad (2024). "Recent progress on battery thermal management with composite phase change materials". Energy Storage. 6 (4): e647. doi:10.1002/est2.647. ISSN 2578-4862. <a href="https://onlinelibrary.wiley.com/doi/10.1002/est2.647" target="_blank">https://onlinelibrary.wiley.com/doi/10.1002/est2.647</a> <a href="#fnref:37" class="footnote-back-ref">↩</a></li>
<li id="fn:38">Wang, Ji-Xiang; Mao, Yufeng; Miljkovic, Nenad (2024). "Nano-Enhanced Graphite/Phase Change Material/Graphene Composite for Sustainable and Efficient Passive Thermal Management". Advanced Science. 11 (38): 2402190. doi:10.1002/advs.202402190. ISSN 2198-3844. PMC 11481206. PMID 39119846. <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11481206" target="_blank">https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11481206</a> <a href="#fnref:38" class="footnote-back-ref">↩</a></li>
<li id="fn:39">Arasteh, Hossein; Maref, Wahid; Saber, Hamed H. (January 2023). "Energy and Thermal Performance Analysis of PCM-Incorporated Glazing Units Combined with Passive and Active Techniques: A Review Study". Energies. 16 (3): 1058. doi:10.3390/en16031058. ISSN 1996-1073. <a href="https://doi.org/10.3390%2Fen16031058" target="_blank">https://doi.org/10.3390%2Fen16031058</a> <a href="#fnref:39" class="footnote-back-ref">↩</a></li>
<li id="fn:40">Vigneshwaran, Pethurajan; Shaik, Saboor; Suresh, Sivan; Abbas, Mohamed; Saleel, Chanduveetil Ahamed; Cuce, Erdem (2023-05-23). "Solar Salt with Carbon Nanotubes as a Potential Phase Change Material for High-Temperature Applications: Investigations on Thermal Properties and Chemical Stability". ACS Omega. 8 (20): 17563–17572. doi:10.1021/acsomega.2c07571. PMC 10210211. PMID 37251134. <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10210211" target="_blank">https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10210211</a> <a href="#fnref:40" class="footnote-back-ref">↩</a></li>
<li id="fn:41">Abdullah, Md.; Obayedullah, Mohammad; Musfika, Sawda Ahmed (2025). "Recent Advances in Phase Change Energy Storage Materials: Developments and Applications". International Journal of Energy Research. 2025 (1): 6668430. Bibcode:2025IJER.202568430A. doi:10.1155/er/6668430. ISSN 1099-114X. <a href="https://doi.org/10.1155%2Fer%2F6668430" target="_blank">https://doi.org/10.1155%2Fer%2F6668430</a> <a href="#fnref:41" class="footnote-back-ref">↩</a></li>
<li id="fn:42">Kenisarin, M; Mahkamov, K (2007). "Solar energy storage using phase change materials". Renewable and Sustainable –1965. 11 (9): 1913–1965. Bibcode:2007RSERv..11.1913K. doi:10.1016/j.rser.2006.05.005. <a href="/wiki/Bibcode_(identifier)" target="_blank">/wiki/Bibcode_(identifier)</a> <a href="#fnref:42" class="footnote-back-ref">↩</a></li>
<li id="fn:43">Omer, A (2008). "Renewable building energy systems and passive human comfort solutions". Renewable and Sustainable Energy Reviews. 12 (6): 1562–1587. Bibcode:2008RSERv..12.1562O. doi:10.1016/j.rser.2006.07.010. <a href="/wiki/Bibcode_(identifier)" target="_blank">/wiki/Bibcode_(identifier)</a> <a href="#fnref:43" class="footnote-back-ref">↩</a></li>
<li id="fn:44">Chatterjee, Rukmava; Beysens, Daniel; Anand, Sushant (2019). "Delaying Ice and Frost Formation Using Phase-Switching Liquids". Advanced Materials. 31 (17): 1807812. Bibcode:2019AdM....3107812C. doi:10.1002/adma.201807812. ISSN 1521-4095. PMID 30873685. <a href="https://hal.science/hal-04005223" target="_blank">https://hal.science/hal-04005223</a> <a href="#fnref:44" class="footnote-back-ref">↩</a></li>
<li id="fn:45">Aravind, Indulekha; Kumar, KP Narayana (2015-08-02). "How two low-cost, made-in-India innovations MiraCradle & Embrace Nest are helping save the lives of newborns". timesofindia-economictimes. <a href="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" target="_blank">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</a> <a href="#fnref:45" class="footnote-back-ref">↩</a></li>
<li id="fn:46">"MiraCradle - Neonate Cooler". miracradle.com. <a href="https://miracradle.com/" target="_blank">https://miracradle.com/</a> <a href="#fnref:46" class="footnote-back-ref">↩</a></li>
</ol>

Phase-change material open-in-new

Phase-change material