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

[Chris Jones]

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


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