[TRNSYS-users] Power use of tpype 927 almost constant

[David BRADLEY]

The performance of the heat pump comes from the data that is stored in 
the data file that Type927 references. Type927 reads the data points in 
the file and interpolates between them to find the performance for the 
present inlet conditions. Be aware, though, that the Type cannot 
exptrapolate beyond the data range given in the file. If you are asking 
for performance at inlet conditions not covered in the data file you 
will get erroneous results. At the end of a simulation the *.lst file 
contains a note about how often the performance data files were accessed 
above or below their range so that you can get an idea whether this is a 
problem in your case.

kind regards,

  David


On 1/10/2023 1:37 PM, Amirreza Heidari via TRNSYS-users wrote:
> Hello,
> I am using type 927 to model a water to water heat pump. But I wonder 
> why the variations of heat pump power use with the flow rate and the 
> load temperature is too small. For example, a load with a double 
> flowrate and 2 C higher temperature only increases the power usage by 
> 0.1 kW. Any ideas about what can be wrong? The flowrate and 
> temperature of sourceside is fixed.
>
> image.png
> image.png
>
>
>
> _______________________________________________
> TRNSYS-users mailing list
> TRNSYS-users at lists.onebuilding.org
> http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org

-- 
***************************
David BRADLEY
Principal
Thermal Energy System Specialists, LLC
3 North Pinckney Street - suite 202
Madison, WI  53703 USA

P:+1.608.274.2577
d.bradley at tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com
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