[Equest-users] Spam: eQUEST condensing boiler

Steven Gates stvgates at pacbell.net
Wed Jun 25 09:15:53 PDT 2008

Thanks Jim,


Your idea regarding a "wish list" for new features in eQUEST is a good one.
It might be best to post requests to either the
equest-users at lists.onebuilding.org, or send them directly to me at
Steve.Gates at doe2.com. It would be best to not burden the main bldg-sim list
with requests specific to eQUEST. 



From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of James Hess
Sent: Wednesday, June 25, 2008 6:29 AM
To: steve.gates at doe2.com; bldg-sim at lists.onebuilding.org;
equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Spam: eQUEST condensing boiler




Glad to hear this, as this will be a good feature for eQuest.  In the past
when we've performed analysis on condensing boilers, we used performance
data from Aerco's website, such as: 




There is a link at the top for the efficiency curves that take into account
return temperature and part load.  You should check with Aerco regarding
using the data, but I'm sure you guys could work out a deal with them and
other boiler manufacturers, similar to what you guys did with ClimateMaster,
to enable us to use custom curves for specific boilers.


It would be nice to have the capability to directly simulate the condensing
boilers in eQuest.  It would save us a bunch of additional steps that we
currently use.  The current method we use for simulating condensing boilers
is to first pull all hourly heating load and temperature data into a
spreadsheet.  Then, we calculate the efficiency for each hour based on the
load and temp conditions, and the Aerco performance curves.  Then, we use
all of those calcs to calculate the annual average efficiency, and then we
enter that number into eQuest along with a custom PLR curve and zero standby
and start-up times.  The custom PLR curve is a "y = m*x + B" type where m =
1 and B = 0 so that the effects of part load are eliminated, since my annual
average efficiency number already takes this into account.    I believe this
is similar to what Marlin showed us in a training class about 2 years ago.


We usually come up with annual average efficiencies of about 90 to 91 %,
which seem reasonable.  Higher efficiencies are available in theory, but
they bump up against the fact that there is usually not much heating load
when you can get away with the lower temperatures required for the higher
efficiencies.  Therefore, the really high efficiencies (when present) don't
have much of an effect on the annual average number.


Hope this helps!


One question; if you guys are in the process of adding a few bells and
whistles to the eQuest program, would you mind if we (eQuest-users)
submitted additional "wish lists" items via this forum?









James A.  Hess, PE, CEM

Energy Engineering Team Leader

TME, Inc.

5800 Evergreen Drive

Little Rock, AR  72205


ph   501-666-6776

fax  501-663-8888

cell  501-351-4667

jhess at tmecorp.com <mailto:email at tmecorp.com> 

www.tmecorp.com <http://www.tmecorp.com/> 


From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Steven
Sent: Tuesday, June 24, 2008 7:32 PM
To: bldg-sim at lists.onebuilding.org; equest-users at lists.onebuilding.org
Subject: Spam:[Equest-users] eQUEST condensing boiler


The eQUEST development team is in the process of implementing a condensing
boiler. We are looking for performance data, both for the effect of entering
temperature on fuel consumption, as well as the impact of part load
operating conditions on fuel consumption.  If you have information you are
willing to share, please contact me.




Steve Gates

(916) 638-1203

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