[Equest-users] FW: Custom curves - Loop to Loop Heat Pump

[Carol Gardner]

Hi Ana,

As always it would be good to see what you are looking at so if you feel
comfortable sending your .inp and .pd2 files please do. I'm not sure why the
HIR field is grayed out but I can understand why 2 HIR curves would confuse
eQUEST. You will have to do a parametric run or just run your model twice,
once with one curve and again with the other curve. Also, be sure to read
the information about curves and curve inputs in the DOE2 manual. All the
data needs to be normalized around the ARI conditions and the ARI conditions
always equal 1.0. It can be confusing at first.

Good luck!

Carol

On Wed, Sep 29, 2010 at 2:29 PM, Ana N. <ananeddav at hotmail.com> wrote:

>
>
> Dear e-quest users,
>
>
>
> I am modeling a central ground source heat pump that provides both cooling
> and heating by using the Loop to Loop Heat Pump. I am trying to derive the
> performance curves based on a very detailed set of data provided by the
> manufacturer. What confuses me is that HIR field under the performance curve
> tab is grayed out.
>
>
>
> I have derived one curve by combining the performance data  for cooling and
> heating mode (by using methodology described for chillers, “Tools and
> Techniques to Calibrate Electric Chiller Component Models<http://www.taylor-engineering.com/downloads/articles/ASHRAE%20Symposium%20AC-02-9-1%20Electric%20Chiller%20Model-Hydeman.pdf>,
> ASHRAE Symposium” ). I am not sure this is the correct approach. Should I
> create one EIR curve by combining the data for cooling and heating (EIR= f(T
> evaporator leaving, T cond entering) and leave HIR curve “grayed out”?
>
> I also run the model with two separate curves
>
> EIR= f (T evaporator leaving, T cond entering),
>
> HIR= f(T evaporator leaving, T cond entering),
>
> each derived using the performance data for corresponding mode of
> operation.
>
>  However, when I run the model with two different HIR curves, the result
> remains unchanged as if e-quest does not use this curve at all.
>
> At this point, I am using default EIR=f( part load). I am still using
> e-quest 3-63.
>
>
>
> I would really appreciate sharing your experience in modeling the Loop to
> Loop Heat Pump and deriving custom curves.
>
>
>
> Thank you
>
>
>
> Ana
>
>
>
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-- 
Carol Gardner PE
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