[Equest-users] Condensing boiler curve issues

Erik Kolderup erik at kolderupconsulting.com
Tue Sep 22 13:13:16 PDT 2015

One thing to keep in mind is that the value for efficiency in eQUEST is
HIR, which is the reciprocal of efficiency. In other words, higher HIR is
worse that lower HIR. Is that what you are seeing?

Another thing you might be seeing is the that value provided by these
curves includes PLR. So at 50% load, the curve value is 0.5 for a boiler
with no part-load degradation.

I've examined the default curves in the past and found they performed
correctly, i.e. in the right direction.


*Erik Kolderup, PE, LEED AP*
erik at kolderupconsulting.com | 415.531.5198 | www.kolderupconsulting.com

On Tue, Sep 22, 2015 at 1:02 PM, Adam Barker <ABarker at pemi.com> wrote:

> Has anyone come across issues with the default condensing boiler curve in
> eQuest?  This curve is a function of part load and return water
> temperature, and based on how condensing boilers work you would anticipate
> the part load efficiency to get worse as return water temperature increased
> (assuming part load is the same).
> I am seeing the opposite in eQuest, where the default 80F RWT is giving me
> a poor seasonal efficiency, and a temperature like 160 RWT (in the
> non-condensing spectrum) is giving me a very high seasonal efficiency.
> Any insight into why this might be happening?
> Adam Barker, MBSc, C.E.T., LEED AP BD+C
> Energy Project Manager
> Provident Energy Management Inc.
> T: 416-736-0630 x 1874 | abarker at pemi.com<mailto:abarker at pemi.com>
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