China Sichuan Aishipaier New Material Technology Co., Ltd. Company News

Energy storage phase change materials： Energy storage phase change materials refer to substances that use the latent heat of phase change for energy storage. It is also known as phase change energy storage or heat storage, energy storage, heat storage materials, latent heat energy storage materials, referred to as phase change materials.     Characteristics of energy storage phase change materials： Energy storage phase change materials have the advantages of high energy storage density, small temperature change in heat absorption and release process, and easy process control, and have a variety of materials and are widely used. Energy storage PCMs have the ability to change their physical state and absorb or release latent heat within a certain temperature range.     Taking solid-liquid phase change as an example, when heated to the melting point, the phase change material absorbs and stores a large amount of latent heat during the melting process. When cooled to the freezing point, the PCM releases latent heat during the solidification process. Energy storage phase change materials should have the following characteristics: non-toxicity, suitable phase change temperature, large latent heat of phase change, stable performance, good reversibility of phase change, small expansion and contraction rate during phase change, excellent thermal conductivity, and low price and easy availability of raw materials.     Classification of phase change materials for energy storag： Energy storage phase change materials can be divided into four categories according to the form of phase change. Solid-liquid phase change materials, solid-gas phase change materials, liquid-gas phase change materials and solid-solid phase change materials. The latent heat of phase change between solid-gas phase change materials and liquid-gas phase change materials is large, but the large volume change, high pressure and poor thermal conductivity limit their application range. The latent heat of phase change of solid-solid phase change materials is low, the phase change process is slow, and the application range is small. Solid-liquid phase change materials have the advantages of large latent heat of phase change, wide range of phase change temperature and low cost, and are energy storage phase change materials with great practical value and mature technology, so energy storage phase change materials usually refer to solid-liquid phase change materials.     Energy storage phase change materials can be divided into inorganic, organic (including polymers) and composite phase change materials according to their composition. Inorganic phase change materials mainly include metals and alloys, crystalline hydrate salts, molten salts, etc., which have the advantages of large latent heat of phase change, high volumetric energy storage density and large thermal conductivity, but have the disadvantages of easy subcooling and phase separation, corrosion container and liquid phase leakage. Organic phase change materials mainly include aliphatic hydrocarbons (paraffin, etc.), fatty acids, alcohols, polyenols, etc., which have the advantages of large latent heat of phase change, stable performance and low cost, but have the disadvantages of small thermal conductivity, low density, volatile and easy aging. Composite phase change materials mainly refer to organic and inorganic eutectic phase change materials to overcome the shortcomings of single inorganic or organic phase change materials, and the most studied ones are shaped phase change materials (SSPCMs) and microencapsulated phase change materials (MEPCMs). Energy storage PCMs are divided into high temperature (above 250°C), medium temperature (250~100°C) and low temperature (below 100°C) phase change materials according to the phase change temperature range. High-temperature phase change energy storage materials are mainly used in concentrated solar thermal power generation, industrial waste heat recovery, high-temperature heat engine and other fields. Medium-temperature phase change energy storage materials are mainly used in solar thermal utilization, drying and dehumidification and other fields; Low-temperature phase change energy storage materials have broad application prospects in the fields of building energy conservation, thermal management of electronic devices, and low-temperature cold storage.     Research and development of phase change energy storage materials： The design, preparation and intensification of energy storage phase change materials are the key to materials research and development. In order to obtain the appropriate phase change temperature and latent heat of phase change, it is necessary to synthesize a variety of phase change materials into multi-component mixed phase change materials according to a certain ratio.     The preparation of energy storage phase change materials mainly includes mechanical methods (loading phase change materials into containers), physical methods (blending method, impregnation method, etc.), chemical methods (polymer polymerization method, sol-gel method, etc.) and microencapsulation method. For low thermal conductivity phase change materials, it is necessary to add excellent thermal conductivity materials (metal fillers, graphite, carbon fiber, etc.), add ribs or capsule encapsulation for strengthening. In addition, the durability and economy of energy storage PCMs are the key to their application development.

Hello everyone, what I want to share with you today is a black technology in the field of building energy efficiency - phase change energy storage materials (PCMs).     What are phase change energy storage materials? In simple terms, PCMs are materials that are able to absorb and release heat within a specific temperature range. They are able to store large amounts of thermal energy during phase change, which gives them great potential in building energy efficiency.     Applications in building energy efficiency： 1. Wall Materials Integrating PCMs into the wall can absorb excess heat during the day and release it at night, reducing the dependence on air conditioning and heating. 2. Roof system The roof is the main part of the building that absorbs solar radiation, and PCMs can help regulate the roof temperature and reduce heat transfer to the interior. 3. Windows Adding PCMs to the double glazing of windows can reduce the ingress of solar heat and improve the thermal insulation performance of windows. 4. Flooring Installing PCMs under the floor can store heat in winter and provide a comfortable indoor temperature.     How to choose the right PCMs? When choosing PCMs, you need to consider their properties such as melting point, heat capacity, thermal conductivity, and their compatibility with the rest of the building.     Future outlook： With the advancement of technology, the application of PCMs will become more and more widespread, and they can not only improve the energy efficiency of buildings, but also bring a more comfortable experience to our daily lives.

Solid-liquid phase change heat transfer includes two processes: solidification of the substance (liquid becomes solid) and melting (solid becomes liquid), the substance is heated to the melting point and absorbs a large amount of heat during the melting process, and the latent heat is released during the solidification process when it is cooled to the freezing point.   Solid-liquid phase transition and heat transfer are common phenomena in nature, such as the formation of volcanic rocks, the evolution of ice and the thawing of the earth, etc., and are also important processes in the field of engineering technology, such as the refrigeration of food, polymer processing, solidification and crystallization of castings, preparation of amorphous alloy materials, refining of semiconductor materials, storage of heat or cold energy, etc.   Solid-liquid phase change heat transfer has the advantages of high heat flux density, high thermal efficiency and low pressure, which has important research significance and application value.     Mathematical models and governing equations for solid-liquid phase transition heat transfer are usually based on the concept of a continuum medium, while assuming the isotropy and uniformity of the solid-liquid phases. Since the solid-liquid interface is directly affected by the physical properties of the substance, the solid-liquid phase change heat transfer can be divided into two categories according to different materials: problems with a single phase transition temperature and a clear solid-liquid interface (pure substance).   The problem of a phase transition temperature in a certain range with the zone of coexistence of two phases (mixture). The heat transfer of solid-liquid phase transition can be divided into two categories according to the different characterization quantities: temperature model (temperature is the only dependent variable, and the energy equation is established in the solid phase and liquid phase regions respectively)   Enthalpy model (temperature and enthalpy are dependent variables, and enthalpy is used to distinguish between solid and liquid phases, without partitioning). The characteristics and difficulties of solid-liquid phase transition heat transfer lie in the moving solid-liquid interface, and are also affected by factors such as the relative flow of liquid, the volume change of solid-liquid phase transition, and boundary thermal resistance.     In the early stage, the solution of solid-liquid phase transition heat transfer mainly used analytical methods, including exact analysis and approximate analysis. Only a few idealized solid-liquid phase transition heat transfer with simple boundary conditions can be accurately solved for a few one-dimensional semi-infinite, infinitely large regions, mainly based on the Neumann problem and the generalized Neumann problem.   The approximation analysis mainly includes the integration method, the quasi-steady state method, the perturbation method, the thermal resistance method, the successive approximation method, etc., which mainly solves the one-dimensional monotonic interface phase transition problem and the very few two-dimensional problems. Numerical methods are the main solutions to the multi-dimensional solid-liquid phase transition heat transfer problem under complex conditions.   There are two main models for numerical methods to deal with solid-liquid phase transitions: the separated two-phase model (interface tracking method) and the mixed two-phase model (fixed grid method). The separated two-phase model treats the two phases as two regions, which can reflect the phase transition process in more detail, but the calculation process needs to trace the interface, so the computational effort is large.   The hybrid two-phase model believes that there is no strict interface in the phase transition process, and the two phases coexist, and the calculation is simple but cannot accurately display the interface characteristics. In addition, Monte Carlo and lattice Boltzmann methods are being used to calculate the heat transfer process of solid-liquid phase transition.     Due to the shortcomings of low thermal conductivity of phase change materials, especially organic phase change materials, the enhanced heat transfer of solid-liquid phase change is also an important problem that must be solved.   And there are two main types of strengthening methods: adding high thermal conductivity metal or non-metallic solid particles to improve the thermal conductivity of phase change materials; Strengthened structures such as metal foam, metal fins, and expanded graphite are used to strengthen heat transfer to phase change materials.

Biological Phase Change Energy Storage Materials: The New Favorite Of Green Energy In The Future     In the pursuit of sustainable and eco-friendly energy solutions, biophase change energy storage materials have attracted extensive attention from the scientific and technological community due to their unique advantages.   What are biophase change energy storage materials? In short, this is a "fused eutectic mixed fatty alcohol" extracted from animal and plant fats and prepared by scientific methods, with good energy storage characteristics.     The most attractive thing about these materials is that they have a suitable phase transition temperature and a high latent calorific value, in other words, they can store and release large amounts of energy within a specific temperature range. Not only that, they are non-subcooling, non-toxic, non-corrosive, and have excellent molecular and thermal stability.   What do these characteristics mean? For the design of energy-efficient buildings and the development of more environmentally friendly heating and cooling systems, biophase change energy storage materials are like a clear stream, bringing innovative alternatives to traditional energy use.   It is not difficult to foresee that with the advancement of science and technology and the improvement of environmental awareness, such materials will be increasingly used in daily life, such as temperature-controlled clothing, food transportation, solar power generation and other fields to show their unique value.   In the final analysis, biological phase change energy storage materials are not simple scientific and technological products, but an important force carrying green concepts and promoting energy transformation and upgrading. Let's look forward to writing more exciting chapters in the future of energy!

Phase Change Energy Storage Materials: The Future of Energy Efficiency     In today's pursuit of green, low-carbon and sustainable development, the efficiency of energy use is particularly important. Among them, phase change materials (PCM) have become a rising star in the field of energy science and materials science due to their efficient energy storage capabilities and broad application prospects.   So, what is phase change energy storage? Put simply, it is the use of heat energy absorbed or released when the state of a material changes to store energy. Just as water absorbs and releases heat when it turns into ice or steam, PCM also "stores" and "releases" energy through this phase transition.     Here's a look at some of the striking features of these materials: 1.High energy storage density PCMs can absorb or release a lot of latent heat during the conversion process, which means they are able to store more energy in a smaller volume, improving space utilization.  2.Temperature stability During the phase change, the material temperature remains almost constant, which is a huge advantage for environments that require precise temperature control.  3.Reusable PCM energy storage materials can be recycled thousands of times without loss of efficiency, which makes them excellent in terms of longevity and reliability.  4.Diverse material options From organic substances to inorganic salts to bio-based materials, PCMs are available in a wide variety of types, making them easy to customize and optimize for different needs.  5.Energy Saving By making efficient use of waste heat from daily activities, or by regulating the temperature in buildings, PCMs help reduce energy consumption and reduce greenhouse gas emissions.  6.Affinity with renewable energy PCMs can work with renewable energy technologies such as solar and wind energy to compensate for their intermittent and unstable problems and achieve a smooth supply of energy.  7.Leading innovative applications Whether it's cooling electronics, solar water heating systems, heating, ventilation and air conditioning (HVAC) systems, or textiles and medical devices, PCMs are opening up new fields of application and possibilities.      In this article, we have only scratched the surface of the mystery of phase change energy storage materials. As you can see, these materials not only have many exciting properties, but they also play a vital role in driving energy efficiency and fostering the integration of renewable energy.   With the continuous advancement of technology, phase change energy storage materials will undoubtedly play a leading role in the future energy landscape, adding more sustainable colors to our lives.

In our prior article, we embarked on a journey to acquaint you with the fundamental concept and basic principles underpinning phase change energy storage technology. This initial foray provided a springboard for understanding this innovative field.   Today, we're set to delve deeper, peeling back the layers to explore the intricate classification and diverse application areas that define phase change energy storage technology.     1.Low - Temperature Phase Change Materials Low - temperature PCMs are predominantly crafted from organic substances. This group encompasses paraffins, which are well - known for their wax - like consistency and ability to store and release heat efficiently. Fatty acids and their derivatives, polyols, and polyethylene also find their place within this category. One of the most remarkable features of these materials is their adjustable phase change temperature point. This characteristic, combined with their excellent chemical stability and compatibility, renders them invaluable in the domain of building temperature control. ​   Consider the winter months: low - temperature PCMs function as intelligent heat regulators. They absorb the excess heat generated within a room during the day, perhaps from sunlight streaming through windows or the operation of household appliances. As night falls and the temperature drops, they gradually release this stored heat, maintaining a cozy and stable indoor environment. This natural heat regulation mechanism significantly reduces the reliance on traditional heating systems, translating into substantial energy savings.   2.Medium and High - Temperature Phase Change Materials Medium and high - temperature phase change materials are a different breed altogether. Comprising mainly inorganic salts, metals, and alloys, these materials are designed to handle higher phase change temperatures. Their robust nature makes them ideal candidates for industrial heating processes and solar thermal collection systems.​ ​   Take, for instance, certain inorganic salts. In solar water heaters, these salts act as energy storage reservoirs. During the day, when the sun is at its peak, they absorb and store solar energy as they undergo a phase change. This stored energy is then slowly released at night, ensuring a continuous supply of warm water. Similarly, in thermal power stations, these materials can be integrated into the energy storage infrastructure, helping to optimize the utilization of thermal energy and enhance the overall efficiency of the power generation process.   3.Microencapsulated Phase Change Materials Among the diverse array of phase change materials, microencapsulated phase change materials stand out as a technological marvel. These materials encapsulate the phase change substance within minuscule capsules. This encapsulation serves a dual purpose. ​   Firstly, it provides a high degree of control over the transfer and storage of heat. The capsules act as individual heat - storage units, allowing for precise management of thermal energy. Secondly, their small size and encapsulation make them highly adaptable. They can be easily incorporated into other materials, whether it's a composite building material or a specialized industrial coating. This integration not only broadens the application scope of the phase change material but also enhances the performance of the host material, creating new possibilities for energy - efficient solutions.   ​   Application： In an era increasingly focused on sustainability and resource conservation, phase change energy storage technology has emerged as a beacon of hope. Its potential impact spans across multiple sectors, with a particular emphasis on energy conservation, emission reduction, and the effective utilization of new energy sources.     In the construction industry, the integration of phase change materials represents a paradigm shift. By incorporating these materials into building envelopes, floors, and ceilings, it becomes possible to create a self - regulating thermal environment. These materials dampen indoor temperature fluctuations, ensuring that the interior remains comfortable throughout the day and night.     This not only enhances the quality of life for occupants but also significantly reduces the energy consumption of air conditioning and heating systems. The result is a more sustainable and energy - efficient built environment.     If you've found yourself intrigued by the world of phase change energy storage technology and hunger for more in - depth knowledge, stay tuned. Our upcoming articles will plunge into the advanced concepts, cutting - edge research, and the latest developments in this dynamic field. And don't forget to show your support by liking and sharing this content, spreading the word about the exciting possibilities of phase change energy storage.  

Energy storage phase change materials： With the global consensus on the goal of carbon peak and carbon neutrality, all countries have increased the construction of renewable energy, which has greatly increased the demand for energy storage and heat storage equipment.     The development of energy storage technology has played a huge role in promoting, followed by the "Notice on Further Improving the Time-of-Use Electricity Price Mechanism", which provides strong policy support for the application of heat storage technology in peak shaving and valley filling and clean heating, and once again gives the heat storage industry great impetus and confidence.     What is Energy Storage: Energy storage refers to the process of storing energy in the form of fruit seeds through a medium or device, and then releasing it in a specific form when needed.     Among them, thermal energy storage, also known as heat storage, is one of the important forms of energy storage, which refers to the technology of storing thermal energy in a specific medium and converting it into electrical energy or other forms of energy when needed.     Heat storage technology is further divided into:Sensible thermal energy storage, phase change energy storage, thermochemical energy storage.     What is phase change energy storage technology:     Phase change energy storage technology is a new type of energy-saving technology, which can convert low-temperature heat into high-temperature heat, so as to achieve efficient use of energy.   At the heart of this technology is the phase change material, which can absorb or release a large amount of heat when the temperature changes, thus enabling the storage and release of heat.     What are phase change energy storage materials: Phase change energy storage materials are the core of phase change technology. In the process of phase change, it can exchange energy with the external environment (absorb heat from the external environment or release heat from the external environment).     So as to achieve the purpose of controlling the temperature of the environment and using energy. The phase change material absorbs heat from a solid state to a liquid state, and when the heat is released, it changes from a liquid to a solid state.     Although the temperature does not change during the melting or solidification process, the latent heat absorbed or released by the PCM is considerable. Along with the phase transformation of the material, the energy is stored and released accordingly.

Phase change energy storage technology is a technology that uses substances to absorb or release heat during phase change for energy storage and release. In the field of cold storage, phase change materials (PCM) are widely used to store cold energy and release it when needed.     Phase change energy storage technology can effectively store cooling energy during the trough period of power demand and release the cold energy during the peak power demand period, so as to balance the load of the grid and improve the operation efficiency of the power system.       Energy saving and environmental protection： The phase change energy storage technology avoids the frequent start and stop of traditional refrigeration equipment during operation, reducing energy waste and equipment wear.     At the same time, as a kind of renewable energy, the application of PCM can help reduce carbon emissions and achieve environmental protection goals.     Energy is the foundation of material and social development, and energy saving, consumption reduction, emission reduction, and environmental protection are great undertakings to ensure the sustainable development of society and benefit future generations.     However, in today's "haze" and nature's continuous wake-up call, there are still many people who know little about energy conservation.       Stable and reliable： The phase-change energy storage technology uses advanced PCM materials and design to ensure stable operation over a long period of time and provide a reliable supply of cooling capacity. In addition, the technology effectively reduces the risk of refrigeration interruptions due to power outages or other failures.         Reduce operating costs： By making reasonable use of phase change energy storage technology, enterprises can store cooling capacity during peak consumption periods and release cooling capacity during peak consumption periods, thereby reducing electricity costs.     In addition, businesses can further reduce maintenance and operating costs due to reduced wear and tear on equipment and energy waste.       Increase the life of your equipment： Compared with traditional refrigeration equipment, phase change energy storage technology avoids the impact of frequent start and stop operations on the equipment, thereby prolonging the service life of the equipment.     This can not only save equipment procurement costs, but also reduce the frequency of equipment repair and replacement, and improve the operational efficiency of enterprises.       Wide range of applications： Phase change energy storage technology is not only suitable for large-scale industrial refrigeration projects, but can also be widely used in the refrigeration needs of commercial buildings, data centers, food processing and other fields.     This wide range of applications makes the technology have great market potential in the industrial and commercial sectors.

As an efficient, stable and safe energy storage method, phase change energy storage technology has a supporting role in building a green and low-carbon transformation, and is becoming an important force in comprehensively promoting the construction of a beautiful China.     At the same time, phase change energy storage also plays an important role in energy conservation and emission reduction, improving energy efficiency, promoting the development of renewable energy and promoting the development of low-carbon economy.     The role of energy conservation and emission reduction：   In the energy - intensive industrial sector, phase change energy storage technology can be integrated into industrial processes. Consider the metal - smelting industry, where large amounts of heat are required for melting metals.     After the smelting process is completed, a significant amount of waste heat is usually released into the environment. By installing phase change energy storage systems, this waste heat can be captured and stored. The stored heat can then be used to pre - heat raw materials in subsequent production batches. This not only reduces the amount of energy needed to heat the raw materials from scratch but also decreases the overall energy consumption of the industrial process.     As a result, the amount of fossil fuels burned to generate energy for the smelting process is reduced, leading to a direct decrease in carbon dioxide and other pollutant emissions.     Improve energy efficiency：     Phase change energy storage technology can effectively solve the mismatch between energy supply and demand in time and space, so as to improve energy efficiency.     For example, storing excess solar energy generated during the day and releasing it at night can solve the problem of nighttime power shortages in many areas. In addition, phase change energy storage technology can also convert otherwise unusable waste heat into usable energy through energy recovery, further improving energy efficiency.     Promoting the development of renewable energy：     Phase change energy storage technology provides strong support for the development of renewable energy. Renewable energy sources such as wind and solar energy are greatly affected by the weather, and the intermittent nature of their power generation leads to unstable power supply, while the energy storage characteristics of phase change energy storage technology can solve the fluctuating energy storage, including the storage of energy converted into cold and heat.     In addition, phase change energy storage technology can also increase the use of renewable energy, such as geothermal, solar thermal, waste heat, etc., and the use of phase change energy storage technology can improve energy efficiency and increase the utilization rate of renewable energy.     Promote the development of low-carbon economy：     With the increasing problem of global climate change, the development of a low-carbon economy has become an important strategy for all countries.     As one of the key technologies to achieve a low-carbon economy, phase change energy storage technology can promote the transformation of a low-carbon economy by improving energy efficiency and promoting the development of renewable energy.     In addition, phase change energy storage technology can also ensure the stable operation of the power system and reduce the environmental pressure caused by traditional energy consumption with high carbon emissions.

In today's era, where the global community is wholeheartedly engaged in the pursuit of green, low - carbon, and sustainable development paths, the significance of enhancing the efficiency of energy utilization has reached a new height.     As the world grapples with energy shortages and environmental challenges, every aspect of energy consumption and management is under intense scrutiny. Improving energy efficiency is not merely an option but an absolute necessity for the long - term survival and prosperity of humanity.     Among the various solutions emerging in this context, phase change materials (PCM) have emerged as a remarkable rising star within the intertwined fields of energy science and materials science. Their ascent to prominence is primarily attributed to their highly efficient energy storage capabilities, which hold the potential to revolutionize the way we manage and utilize energy.     Moreover, their broad and far - reaching application prospects span across multiple industries, from building construction to electronics, transportation, and even aerospace.   So, what exactly is phase change energy storage? To put it in the simplest terms, it is a process that capitalizes on the heat energy absorbed or released during the transformation of a material's physical state to store energy. This phenomenon can be easily understood by considering the common example of water. When water freezes into ice or evaporates into steam, it either absorbs or releases heat.     Similarly, PCM operates on the same principle, "storing" energy during one phase transition and "releasing" it during the reverse transition. This unique property allows for a more efficient and flexible way of handling energy, unlike traditional energy storage methods.   PCMs possess an extraordinary ability to absorb or release a large quantity of latent heat during their conversion processes. This remarkable characteristic implies that they can pack a significantly larger amount of energy within a relatively smaller volume.     In practical terms, this means that in applications where space is at a premium, such as in compact electronic devices or in urban building designs with limited space, PCMs can store substantial amounts of energy without taking up excessive room.     By doing so, they effectively improve space utilization, making them an ideal choice for a wide range of scenarios where both energy storage and space conservation are crucial factors.

There are two types of phase change heat storage methods: sensible heat energy storage and latent heat energy storage.     Sensible heat energy storage： The process of storing or releasing heat by raising or decreasing the temperature of a material by using the heat capacity of a material.   --Heat capacity   For a closed system with no phase change or chemical change, and the non-volumetric work is equal to zero, the heat absorbed by the system per increase in unit thermodynamic temperature (1K).       Characteristics of sensible thermal energy storage： 1.Advantages The principle is simple, the material source is abundant, the cost is low, the system structure is simple, and the operation is convenient 2.Disadvantages The energy storage density is small and the energy storage device is large     Latent heat energy storage: It is carried out by using the energy absorption and release that accompanies the transition of the state of matter.     Latent heat of phase change:     The absorption or release of the energy that accompanies the phase transition process is called the latent heat of phase transition.     Advantages of latent heat energy storage: Much higher energy storage density than sensible thermal energy storage. Such as: water     When water boils at atmospheric pressure, its latent heat is about 2260kJ/kg, and when the ice melts, its latent heat is 355kJ/kg.     The sensible heat of water heated from 20°C to 40°C at a pressure of 1 atmosphere with a temperature difference of 20°C is only 84 kJ/kg     Phase transformation forms of energy storage materials

Phase change cold storage technology uses the endothermic or exothermic process of phase change materials to store and apply energy, which plays a role in controlling temperature, reducing energy consumption and transferring energy load.     In the field of cold chain transportation, China's annual loss rate of aquatic product decay due to unqualified low temperature environment in the transportation process is 25%, and the loss rate of fruits and vegetables is 25%~35%, and more than 50% of the world's vaccines are wasted.     Therefore, cold storage technology can reduce the probability of product deterioration by reducing the temperature fluctuation during transportation in the field of cold chain transportation, effectively reduce product loss, and realize long-distance transportation of food and medical supplies.     Cold storage materials are the core of cold storage technology, and the development of cold storage materials with suitable temperature and high cold storage density is the key to meet different cold storage needs.     At present, the common cold storage materials mainly include: sensible heat storage materials and latent heat storage materials. Sensible heat storage materials include water, etc., which use the change of heat energy in the process of heating up and down for energy storage and release, which is mature and cheap, and suitable for large-scale production.     However, its cold storage density is small, and it is only suitable for short-term cold storage scenarios at the minute and hour levels.     Ash Pel specializes in the research and production of cold storage phase change ice boxes, mainly -30 degrees, -20 degrees, -10 degrees, -8 degrees, etc., can produce customized cold storage phase change ice boxes of different specifications and different temperatures, welcome to order processing!