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
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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@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