[TRNSYS-users] Type 655 air cooled chiller external file and COP

[Jeff Thornton]

Santeri, 

Simply add the data points for the lower temperatures to
the existing data file - following the required format. You'll also need
to update your parameters to reflect the change in the number of data
points. However, it's often difficult to find performance data for
chillers at ambient temperatures below ~20C... 

Jeff 

---

Jeff
Thornton 

_President - TESS LLC_ 

_22 N. Carroll Street, Madison WI
USA 53703_ 

_Office: (608) 274-2577 Fax: (608) 278-1475_


_www.tess-inc.com_ 

_E-Mail: thornton at tess-inc.com_ 

On 05/09/2012
6:30 am, Santeri Siren wrote: 

> Dear Trnsys users,
> 
> I am using
type 655 air cooled chiller in my simulations. I noticed that for
example the ambient air temperature affects the COP only in the interval
of temperatures that are defined in the external data file.
> For
example, in the example data file that is provided with the TESS library
there are capacity ratios and cop ratios for ambient air temperatures
varying from 23.89 to 46.11. The COP changes only between these
temperatures. If the ambient air temperature is more than 46.11 or less
than 23.89, then it doesnt affect the COP at all.
> 
> I am using
weather file for Helsinki Finland, so ambient air temperatures are very
low in the winter time. Is there any way to make the ambient air
temperature affect the COP also in lower temperatures? 
> 
> Best
regards Santeri Siren
 
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