[BLDG-SIM] Condensing Boilers

[Graham & Megan]

Steve / Jeff,
Correct me if I am wrong but eQuest does have a part load curve that varies
efficiency (HIR) as a function of either entering (or leaving) water
temperature.  This curve however defaults to 1 regardless of temperature.
If one has the data then I believe you can set up the curve and thus the
unit to perform the way you want.
Regards,
Graham
----- Original Message ----- 
From: "Alec Stevens" <astevens at dmiinc.com>
To: <BLDG-SIM at GARD.COM>
Sent: Monday, August 21, 2006 11:17 PM
Subject: [BLDG-SIM] Condensing Boilers


> Chris,
> A comment on "picking an average" return water temp:
>
> In New England, return water temperatures will vary significantly during
the
> heating season, and picking an average will not accurately show monthly
fuel
> consumption.  What we have done in this situation is to set up two boilers
> in the model, one with condensing performance, and the other with standard
> performance.  We then use equipment scheduling to switch between the two
> based on OA temp.  The OA temp threshold is based on the HW Reset
Schedule,
> the expected coil delta T, and the return water temperature at which the
> boiler goes into condensing mode.  I believe the return water value is
> around 135F.
>
> It would be a nice feature to have eQuest allow return water temp to
factor
> into boiler performance.
>
> Sincerely,
> Alec Stevens, PE, LEED AP
> DMI
> 450 Lexington St., Newton, MA 02466
> p: 617-527-1525 x105 f: 617-527-6606
> e: astevens at dmiinc.com
>
>
>
>
> -----Original Message-----
> From: BLDG-SIM at GARD.COM [mailto:BLDG-SIM at GARD.COM] On Behalf Of Chris
Jones
> Sent: Thursday, August 17, 2006 7:10 AM
> To: BLDG-SIM at GARD.COM
> Subject: [BLDG-SIM] Condensing Boilers
>
> Aerco efficiency curves are available for their condensing boilers on the
> aerco web site.  You can then create the DOE2 curves following the DOE2
> manual.  Note that condensing boiler efficiency depends on the return
water
> temperature.  As far as I know, the boiler efficiency curve in DOE2 does
> not include return water temperature so you have to pick an "average"
> return water temperature for your specific application and then use that
> curve.
>
>
>
>
>
>
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