[Equest-users] How to set the COP of a chiller as constant in eQuest?

[Joe Huang]

Erik,

You're right.  It should be a straight diagonal line from 0,0 to 1,1.

Joe

Joe Huang
White Box Technologies, Inc.
346 Rheem Blvd., Suite 108D
Moraga CA 94556
yjhuang at whiteboxtechnologies.com
www.whiteboxtechnologies.com
(o) (925)388-0265
(c) (510)928-2683
"building energy simulations at your fingertips"


On 4/17/2013 3:43 PM, Erik Kolderup wrote:
> Nick,
>
> One point of correction regarding curves to provide constant COP... I'm pretty sure you 
> do not want the EIR-FPLR curve to be constant 1.0. The value of that curve is actually 
> (normalized EIR)*(part load ratio). So if you want constant EIR, then the curve should 
> just equal PLR. That's a straight line between (0,0) and (1,1). So the "a" coefficient 
> should be zero and the "b" coefficient should be 1.0. All other coefficients for that 
> curve should be zero.
>
> -Erik
>
> *Erik Kolderup, PE, LEED AP*
> erik at kolderupconsulting.com <mailto:erik at kolderupconsulting.com>| 415.531.5198 
> <tel:415.531.5198> | www.kolderupconsulting.com <http://www.kolderupconsulting.com>
>
>
>     ---------- Forwarded message ----------
>     From: Nick Caton <ncaton at smithboucher.com <mailto:ncaton at smithboucher.com>>
>     To: Joe Huang <yjhuang at whiteboxtechnologies.com
>     <mailto:yjhuang at whiteboxtechnologies.com>>, Esmireta <e2fye2 at 163.com
>     <mailto:e2fye2 at 163.com>>
>     Cc: "equest-users at lists.onebuilding.org <mailto:equest-users at lists.onebuilding.org>"
>     <equest-users at lists.onebuilding.org <mailto:equest-users at lists.onebuilding.org>>
>     Date: Wed, 17 Apr 2013 19:40:31 +0000
>     Subject: Re: [Equest-users] How to set the COP of a chiller as constant in eQuest?
>
>     After identifying the curves in play per Joe’s suggestion, you could achieve a
>     constant COP, independent of part load or other variables, by making a set of custom
>     curves (of appropriate/acceptable type) using coefficient inputs.
>
>     Example from the library:
>
>     CentH2O-EIR-fPLR&dT looks like this from the library before modification.  This
>     curve works alongside others to determine how to modify the input EIR for a chiller:
>
>     What we want is for this and all the other curves to return a value of 1.0, whatever
>     the hourly variables throw at it.  Simply enter all coefficients preceding a
>     variable (b,c,d,e,f) to 0.  Set the coefficient for the curve’s constant (a) at 1.0:
>
>     Doing the same for all associated curves (again, read up in the help/documentation
>     for your particular equipment to be sure), at all hours the chiller in question will
>     operate at the specified EIR without variance.
>
>     ~Nick
>
>     cid:489575314 at 22072009-0ABB**
>
>     **
>
>     *NICK CATON, P.E.*
>
>     SENIOR ENGINEER
>
>     Smith & Boucher Engineers
>
>     25501 west valley parkway, suite 200
>
>     olathe, ks 66061
>
>     direct 913.344.0036 <tel:913.344.0036>
>
>     fax 913.345.0617 <tel:913.345.0617>
>
>     www.smithboucher.com <http://www.smithboucher.com>__
>
>
>
>
>
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