[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[BLDG-SIM] Simulation on Thermal Energy Storage using DOE2.2

We did an analysis of an existing building with a large heat/cool storage system. The Owners were very surprised to find out that the building was not energy efficient - it just saved on demand charges. The pumping of fluid in and out of the tanks, through heat exchangers occurred 24 hours a day significantly increasing the kWh beyond that of a conventional hydronic heat/cool building. 

At 01:26 11/26/2004, you wrote:

Dear Martin,
I think the findings may be correct.
First, for a TES system the leaving chilled water temperature usually will be lower, so the COP will be deduced, but as the outside temperature is lower, it does not deduced alot. Second, if the TES system using brine water, i think the efficiency will reduce more. As our experience in some project in Hong Kong and Mainland, TES system can only reduce electricity cost due to tariff rate rather than consumption. 
I hope these comment would help.

Regards,
Ernest Tsang
Meinhardt (M&E) Ltd


Martin Yip <yipch@xxxxxxxxxxx> wrote:
Dear Bldg-sim Subscribers,<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />
I recently simulated an air cooled chiller plant with cold water tank thermal energy storage using DOE 2.2. I originally expected some energy saving due to improve chiller COP at night charging the storage when compare it with a system without storage. However, the results showed an energy penalty of a few percentages even though hourly data actually showed COP improvement during charging. I have already set the loss coefficient to zero for the TES. I should be most grateful if anyone can comment on this issue and provide some suggestion. 

Thanks

Martin YIP
Engineer
EMSD, HKSAR
=====================================================You received this e-mail because you are subscribed 

to the BLDG-SIM@xxxxxxxx mailing list.  To unsubscribe

from this mailing list send a blank message to

BLDG-SIM-UNSUBSCRIBE@xxxxxxxx
­É¹L¡B¤@©ç¨â´²¡B©_¬¥§õºû´µ¦^«H...
¥þ´ä³Ì¤j¤â¾÷¤U¸ü¤¤¤ß
<http://us.rd.yahoo.com/evt=22281/*http://hk.yahoo.com/mail_tagline/?http://mobile.yahoo.com.hk/>http://mobile.yahoo.com.hk/



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Chris Jones
EnerSys Analytics Inc.
14 Oneida Avenue
Toronto, ON M5J-2E3
Tel. 416 203-7465
Fax. 416 946-1005 

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