[Equest-users] eQEST auto sizing, capacity is smaller than the secondary demand

[Heinrich.ib-bauklima.de]

Hi Everyone,

I have a question about auto sizing feature of eQUEST, related to primary-
and secondary loops. 

If I let eQUEST size the boilers and chillers everything feels fine, but I
get capacities that are much bigger than the capacities in the SS-D report.
The auto sized capacities for boilers and chillers are in the range of
double the size of the SS-D report.
 
If I take the capacities of SS-D report for boilers and chillers every thing
works fine as well, but I get the following warnings:
 
**WARNING*******************************************************************
***

Loop: Primärkreis Kältemaschinen cooling capacity is smaller

than the secondary demand. Primary= 6776000.

Secondary= 11205034.

**WARNING*******************************************************************
***

Loop: Primärkeis FW heating capacity is smaller

than the secondary demand. Primary= -6708000.

Secondary=-11698696.

 

So if I look at the PV-A report I see secondary loop flows that are nearly
double the primary loop flows.
This suits the auto-sized demands of the secondary loops which have
identical LOOP-DESIGN-DT.

 
Bigger loop flows mean bigger pump energy for the secondary loops.
So how can I reduce the secondary loop flows also.
If I just define smaller pump power for the secondary loops I get following
warning.
 
**WARNING*******************************************************************
***

Pump: Sekundärkreispumpen Kühlregister has a total user-specified flow

of 1588. gpm, but the loop flow is 1858. gpm.

 

So should I accept higher pumping energies in the secondary loops because of
auto-sizing? Any hint is highly appreciated !

 
 
 
Heinrich, 
b+e, Munich, Germany
 
 
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