[Equest-users] Graph plot - quadratic eqn

[yashika gulati]

Erik

Thanks a lot. It was a very helpful information. It works !!

Regards
Yashika


On Tue, Apr 8, 2014 at 8:59 PM, Erik Kolderup
<erik at kolderupconsulting.com>wrote:

> Yashika,
>
> Assuming you are trying to create a custom condensing-boiler curve
> (HIR-FPLR), it's important to understand how the curve is defined. The
> result of the curve is normalized HIR*PLR, i.e. normalized heat input ratio
> *times* part load ratio, and it is a biquadratic function of part load
> ratio and HW return temperature. It should equal 1.0 at 100% load and 80F
> HW return. If the efficiency (HIR) stayed constant with changing part load
> (which it doesn't in your graph, but just assume it did for illustration),
> then the value of the curve would be 0.8 at 80% load, 0.5 at 50% load, etc.
>
> -Erik
>
> *Erik Kolderup, PE, LEED AP*
> erik at kolderupconsulting.com | 415.531.5198 | www.kolderupconsulting.com
>
>
> On Tue, Apr 8, 2014 at 12:32 PM, yashika gulati <
> yashika.gulati111 at gmail.com> wrote:
>
>> Hi great minds.
>>
>> How can I plot the graph for given boiler (attachment)? I know we can
>> give rough data in "create new" graph but my results for heating are
>> absurd. Please suggest me the proper technique to do that.
>>
>> Thanks a lot in advance
>> Yashika
>>
>>
>>
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