[Equest-users] Curve fit data

Carol Gardner cmg750 at gmail.com
Fri Aug 13 19:51:15 PDT 2010


Chris,

You are exactly right. Two curves, twice the work!

Carol

On Thu, Aug 12, 2010 at 1:55 PM, Chris Jones <cj at enersave.ca> wrote:

> I haven't looked in the manual but isn't there two curves in your equation:
> EIRt=COOLING-EIR*COOL-EIR-FT*(EWB,ODB)*COOL-EIR-FPLR (PLR)
> You have curve 1: COOL-EIR-FT - EWB, ODB and curve 2: COOL-EIR-FPLR - PLR.
>  I believe you have to define both curves - COOL-EIR-FT and COOL-EIR-FPLR.
>
>
> At 05:15 PM 09/07/2010, you wrote:
>
>> I have a CURVE-FIT question (yes, the same darn project). I am creating
>> curve data for some Daikin VRV using the raw data. The capacity curves are
>> no problem. The governing equation for cooling is:
>> CAPt=Cooling-Capacity*COOL-CAP-FT (EWB,ODB). I have really good data tables
>> that provide the capacity at about 6 entering web bulb temperatures and 20
>> outdoor dry bulb temperatures so I'm good to go there,. All the capacities
>> have been normalized to the ARI conditions and the curves entered as
>> BI-QUADRATIC-T. The problem I'm having is with the cooling EIR curves. The
>> governing equation here is
>> EIRt=COOLING-EIR*COOL-EIR-FT*(EWB,ODB)*COOL-EIR-FPLR (PLR). There is no
>> handy example to refer to like there is for the capacity curves. At first I
>> just proceeded as I did with the capacity curve data: called it a
>> BI-QUADRATIC-T and normalized the EIRs as a function of the entering wet
>> bulb and outdoor dry bulb to the ARI EIR. But what about the PLR? Isn't it a
>> third independent variable? Has anyone had experience with this and if so
>> please enlighten me as to what equation type did you use and how did you
>> include the PLR.
>>
>> --
>> Carol Gardner PE
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>
>
> Chris Jones
> 14 Oneida Avenue
> Toronto, ON M5J 2E3.
> Tel.  416-203-7465
> Fax. 416-946-1005
>
>
>


-- 
Carol Gardner PE
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