Dear Vitalii,

Thanks for your answer. I have already taken care of that aspect very effectively. Meanwhile pl let me know if you can think of any other reason for not using water as PCM.

Regards

bb

Please try this link:

http://www.puretemp.com/stories/understanding-pcms

 thanks for your info. but though they claim having pcms with 5 to 14 times more capable they list none in their pdts list, not  even equalling water.

The main reason behind that is the relatively low melting point of the ice which is zero degree Celsius which limits using the water as PCM. 

Water to ice is 0°C, is is the most used of all PCM, but this is for cooling or refrigeration plants. Water to steam is 100°C at 0,1 MPa absolute pressure, but the volume occupied by steam is huge even under pressure. Now water as sensible heat storage is very good, and better than PCM is a temperature differential of # 30°C or  more is allowed, and we use it for sanitary hot water at 80°C for a minimal 45°C output, i.e. 35°C difference between hot and low temperature of the sensible hot storage

 thx

Large volume change during phase change is also one is biggest problem if you are taking water as a PCM material.

That is because ice is only a good PCM for temperatures at a fixed degree (0 celsius) which makes it unsuitable for most applications. PCMs on the other hand can be used for a broad range of temperatures (-40 to150) celsius.

If water is the best pcm for cold storages and refrigeration that why researchers try for different pcm materials?

I recommend you to read this paper:

http://ijens.org/Vol_18_I_05/180505-3737-IJMME-IJENS.pdf

Best regards