[BLDG-SIM] Thermal Ice Storage using Phase Change Material

[William Bahnfleth]

Alpana,

This is interesting, thanks.  I see that the 
products actually listed in their current 
literature only go down to phase change temperatures of 23C.

The latent heat of 140 kJ/kg is only about 40% of 
that of pure water (335 kJ/kg), so the storage 
density is also around 40% of ice.

Pure ice storage density is around 8 - 10 times 
that of sensible storage for air-conditioning 
applications, but ice storage modules are 
frequently cylindrical and their contents are not 
all water.  In the case of containerized PCM, the 
tank is filled with spheres containing the PCM 
with glycol solution flowing through the void 
space, so the actual density may be only have 
that of the pure PCM.  Consequently, a medium 
with the density of this PCM might in application 
have only two or three times the density of 
sensible storage and is bound to be much more 
expensive.  I believe that this is one of the key 
reasons that higher temperature cool storage PCM 
media flopped in the US a decade ago and why they 
would likely do so again until someone comes up 
with a medium with a (much) higher latent heat.

Bill Bahnfleth

At 09:55 AM 3/16/2007, Alpana Jain wrote:
>Hi Ian,
>
>Pluss Polymers Pvt Ltd, a company based in India 
>has developed a PCM product of 7 Deg C with a 
>latent heat of 140KJ/Kg. Their research though 
>is ongoing and they are in the process of developing more of such products.
>If you would like to contact them, their contact is:
>Name: Samit Jain (samit at manasindia.com)
>         Devendra Jain (djain at manasindia.com)
>Website: http://www.manasindia.com/pluss/
>
>Hope this is of some help.
>
>Alpana
>
>-----Original Message-----
>From: BLDG-SIM at gard.com [mailto:BLDG-SIM at gard.com] On Behalf Of Ian Doebber
>Sent: Wednesday, March 14, 2007 4:41 PM
>To: BLDG-SIM at gard.com
>Subject: [BLDG-SIM] Thermal Ice Storage using Phase Change Material
>
>Does anyone know whether a product exists or 
>research has been done on using replacing water 
>with Phase Change Material for thermal storage 
>systems.  The phase change should have a similar 
>heat of fusion as water (314 kJ/kg) but a melting point at ~40-45°F.
>
>Thanks
>Ian
>____________________________________________________________
>Electronic mail messages entering and leaving Arup  business
>systems are scanned for acceptability of content and viruses
>
>==================
>You received this e-mail because you are subscribed
>to the BLDG-SIM at GARD.COM mailing list.  To unsubscribe
>from this mailing list send a blank message to
>BLDG-SIM-UNSUBSCRIBE at GARD.COM
>
>
>
>You received this e-mail because you are subscribed
>to the BLDG-SIM at GARD.COM mailing list.  To unsubscribe
>from this mailing list send a blank message to
>BLDG-SIM-UNSUBSCRIBE at GARD.COM

_________________________________________________

William P. Bahnfleth, PhD, PE, FASHRAE
Professor of Architectural Engineering
Director, Indoor Environment Center

The Pennsylvania State University
104 Engineering Unit A
University Park, PA 16802 USA

voice: 814.863.2076 / fax: 814.863.4789
e-mail:  wbahnfleth at psu.edu
www.arche.psu.edu/faculty/WBahnfleth/
http://www.engr.psu.edu/ae/iec/
_________________________________________________


===========================
You received this e-mail because you are subscribed 
to the BLDG-SIM at GARD.COM mailing list.  To unsubscribe 
from this mailing list send a blank message to 
BLDG-SIM-UNSUBSCRIBE at GARD.COM