[Equest-users] FW: Help

[Steven Savich]

Vaughn,

 

First, a caveat: I typically do modeling for commercial/institutional
projects, so my assumptions are likely to be different from yours.

 

eQuest shows the DHW loop as closed, so no worries.  The important thing is
to be confident in the DHW loop process load number and the other parameters
you've used for the circ loop and DHW heater.

 

There is only a small amount of gas burned in January for two reasons that I
can see:

You have the baseboards set to thermostatic control, which means they are
the first stage of heating.  Only when space heating loads are not met by
the combination of baseboards and internal space heat gain will the furnace
add heat.

You have entered fairly significant internal loads, gas cooking stoves for
one.  The model doesn't appear to have any exhaust, and transfers all of the
cooking heat to the space.  If there are kitchen exhaust fans, some portion
of the heat will be transferred out of the space.

 

Some things to look at:

Your DHW HIR value - are you confident in this number?

Double check your schedules

DHW circulation pump

DHW process load

Gas stove heat output, sensible/latent ratio, & proportion transferred to
the space?

Double check your schedules

Are your baseboard valves 2 way or 3 way?

Do your space setpoints match your heat and cool schedules?

Furnace system night cycle control is set to off.  Probably should be on?

Why is the furnace schedule off during the day?

The roof appears to have no insulation.  Correct?

Double check your schedules (notice a trend?)

Have a look at your .sim files to get a sense of what is going on.

 

Steven

 

 

 

From: Synergy Team [mailto:synergydesignteam at gmail.com] 
Sent: Tuesday, June 15, 2010 10:18 AM
To: ssavich at systemswestengineers.com
Subject: Re: [Equest-users] Help

 

Hi Steve,

Thanks for the response.  Attached are the requested files. We are actually
now able to simulate building performance, however, i'm not sure that the
DHW loop should be indicated as a closed loop on the diagram and when we run
the simulation, the graph indicates that there is only a small amount of
natural gas burnt in January for space heating and nothing for subsequent
months? Any tricks, advice, suggestions would be helpful. 

Thanks!

Vaughn Slovak
Architectural Designer
Synergy Design
p. 845.255.1733
f. 845.255.1694 

On Tue, Jun 15, 2010 at 12:32 PM, Steven Savich
<ssavich at systemswestengineers.com> wrote:

Please include .pd2 and .inp files.

 

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Synergy
Team
Sent: Tuesday, June 15, 2010 9:22 AM
To: eQUEST-users at onebuilding.org
Subject: [Equest-users] Help

 


We are trying to perform an energy audit using eQuest 3-63 on a 2 Story
multi-family structure located just north of New York City in Westchester
County. This particular building has four 3-bedroom apartment units side by
side each with it's own small boiler room which contains a single natural
gas burning instantaneous hot water boiler serving both space heating as
well as domestic hot water demand. This is a standard system and I feel that
eQUEST should have the capacity to model such a system accurately. However,
we have been unsuccessful thus far in its modelling and simulation. Through
trial and error we were able to model a single diagram in the "water sided
HVAC" window which shows multiple coils (radiators) that are linked to the
DHW Plant and DHW Res Loop but were unable simulate the building performance
due to some error. I would expect to see a diagram that consists of a single
boiler (DHW Plant) with a closed loop to and from the radiators (Multiple
Coils) and an open loop running from the single boiler with an arrow
pointing out to space. Does anyone know a simple way to model this type of
basic system? Please let us know. Thanks.

Vaughn Slovak
Architectural Designer
Synergy Design
p. 845.255.1733
f. 845.255.1694

 

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