Phase change material (PCM) is a substance with a high heat of fusion which, melting and solidifying at a certain temperature, is capable of storing and releasing large amounts of energy. Heat is absorbed or released when the material changes from solid to liquid and vice versa; thus, PCMs are classified as latent heat storage (LHS) units.
Latent heat storage can be achieved through liquid→solid, solid→liquid, solid→gas and liquid→gas phase changes. 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.
Bio-Based, or Paraffin (CnH2n+2), or carbohydrate and lipid derived.
o Freeze without much undercooling
o Ability to melt congruently
o Self nucleating properties
o Compatibility with conventional material of construction
o 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%.
Salt hydrates (MnH2O)
o High volumetric latent heat storage capacity
o Availability and low cost
o Sharp melting point
o Incongruous melting and phase separation upon cycling which can cause a significant loss in latent heat enthalpy.
o Some inorganic eutectics have sharp melting point similar to pure substance.
o Volumetric storage density is slightly above organic compounds.
o They still have the same disadvantages as inorganic PCMs, such as reduced thermal performance upon cycling, corrosivity, high volume change, and high supercooling.
Shanghai Cloud chemical co., LTD, Expert in PCM, is a company focusing on R&D and customization of high-end chemical industry. The company is located in Shanghai Zhangjiang high-tech park. The laboratory has nearly 20 senior staff, including two doctors in the United States. The company's main research and development of phase change materials. We have been focusing on phase change materials for more than 10 years, and we are the earliest professional team to develop phase change materials in China. Our PCM has been Widely used in textile, home appliances, construction, transportation, medical and other fields. At present our products have been exported to Europe and the United States, India, the industry has been praised.
We have a group of positive enthusiasm, lovely and motivated team. We love our work, especially the green and energy-saving high-tech PCM field. When the customer has a goal, but the idea is not clear, we suggest the customer free design program, and we give the most professional energy saving and efficient program.
Now our customers are almost all over the world, southeast Asia, Europe, the United States, South America, involving in the textile, construction, medical, transportation, home appliances, cosmetics, and other industries.