Melting Temperature Non Toxic Non Corrosive Bio Based PCM

1, Features

• SL-PCMs pure nature organic based phase change material

• They are Organic compounds derived from animal fat and plant oils

• They are renewable, they are bio-degraded

• They are congruent melting thermodynamic

• They are with minimal supercooling by comparison with Inorganic PCMs such as salt hydrates

• Low Volumetric expansion from solid to liquid comparing with salt hydrates PCMs 10% volume change expansion

• They have wide temperature range for option, can meet with various occasions and applications where the different relatively temperature desired

• No phase segregation as the Inorganic PCMs which need to introduce agents to address the problem

• They are non-corrosive, easy for various containments compatible with

2, Description

Phase change material(PCMs) typically can be divided into organic and inorganic by Materials. Our SL-PCMs is organic nature plan-based non paraffin-wax phase change material. Organic PCMs including the Paraffin and Bio-based.

As we discussed the water based PCMs like Ice,Ice Gel pack and dry Ice,due to they don’t have Carbon element in their chemical site, they can be concluded as Inorganic category, water also existing in another form- the crystalline salt hydrates, crystalline hydrated salt are the most typical application in the low-medium temperature of inorganic PCMs utilities,they have large amount of phase change heat fusion, and fixed temperature of melting point, actually it is the temperature desired to release the crystal water(before melting,crystal water bounded with inorganic salt),and the released water to dissolve the salt,which absorbs heat,and on the contrary, a reversible process occurs to capture crystal water and exothermic ciruit.

The crysalline hydrated salt PCMs have abilities as:

• They are with high thermal conductivity

• They are with great amount of dissolving heat

• High density heat storage capacity

• They basically in neutral

• They are cheaper than organic PCMs

• They have widely usage

However, the crystalline hydrated salt are vulnerable to supercooling and phase separation, ”supercooling” means that a            substance does not crystallize when it condenses to the freezing point,which causing the problem of phase change                    temperature fluctuated.

Phase separation refer to the process of phase transition reversible,some inorganic salts are insoluble in the crystal water          and collects at the bottom of container.and this phenomenon is irrevsersible,and it happens because of most of the                    crystalline hydrated salt melt incongruently,that is they melt to a saturated aqueous phase and solid phase which is generally      a lower hydrate of same salt, as due to density difference,the salt phase settles out and problem phase separation occurs,          this can be result in the crystalline salt hydrated completely lost the reversibility of phase transition.

Our SL-PCMS material referred as bio-based with congruent melting thermodynamic,will have no phase segregation        problem,and have no supercooling phenomenon with oscillating temperature which resulting in lower effectiveness during          transition and eventually lost their latent heat storage capacity and non-recyclable eventually.

3, Properties