[Equest-users] HVAC System Lockout

[Jeffrey Mancuso]

Dear eQUEST community:

 

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From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Arpan
Bakshi
Sent: Friday, February 04, 2011 4:50 PM
To: Cory Duggin
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] HVAC System Lockout

 

Cory, I would recommend a test run, detaching all schedules, just to let the
auto-size engine do its work; you should see comparable loads. I find
uncoordinated schedules can cause all kinds of ruckus.

On Fri, Feb 4, 2011 at 4:43 PM, Cory Duggin <crduggin at gmail.com> wrote:

Based on what you have said, I think I just need a new heating and cooling
schedule.  I found them in my component tree, but I am not sure how to do
what I want because the annual schedule only specifies an ending month and
day.  How do I know when that schedule starts? 

 

On Thu, Feb 3, 2011 at 9:24 PM, Nick Caton <ncaton at smithboucher.com> wrote:

Whoah buddy =)!

 

First, let me give the preface that I'll be passing the 70hr mark for this
workweek tonight, so I'm kind of in zombie-mode right now XD!

 

Okay, I reckon you're hunting rabbits with a  bazooka by resorting to an
absorption chiller/boiler setup to approximate your gas furnace!  I'd go
ahead and save your work in a separate file for reference, then I'd step
back to the wizards to try a packaged single-zone furnace with DX cooling
for your 2-story zone, and a single-zone heatpump (DX/DX) for your garage.
Make the systems "on" 24hrs with intermittent fan operation, and be sure
you're not specifying "system per zone."  Use the shell wizard to be sure
the zones are assigned to the right system.  

 

If you wish, you can restrict heating and cooling availability for each
system, the way a residential thermostat has "heating" and "cooling" modes,
with a COOLING-SCHEDULE and HEATING-SCHEDULE.  By default, heating and
cooling are generally available whenever they're called for, but you can
edit that without going to a chiller/boiler system ;).

 

If you are finding your building is flip-flopping between heating and
cooling hour-to-hour in the dead of summer, it might be a sign other items
are off. check your envelope constructions/layers, and note that
oversimplifying geometries/spaces (i.e. - one per floor) may result in a lot
of thermal mass from partitions being excluded that would otherwise be a
stabilizing presence.

 

I'm copying the eQuest list, because I will be of little use to you others
in the next 24 hours.  Our strength is in numbers, so do keep everyone in
the loop as you work through this and you'll get the best chance of quality
assistance - best of luck =)!

 

Back to the grindstone.

~Nick

 

Error! Filename not specified.

 

NICK CATON, E.I.T.

PROJECT ENGINEER

Smith & Boucher Engineers

25501 west valley parkway

olathe ks 66061

direct 913 344.0036

fax 913 345.0617

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

 

From: Cory Duggin [mailto:crduggin at gmail.com] 
Sent: Thursday, February 03, 2011 1:23 PM
To: Nick Caton
Subject: Re: [Equest-users] HVAC System Lockout

 

I am modeling a two story house with a one story garage that has been
converted into a conditioned space.  It is setup so there are 3 zones.  One
in each floor of the two story part and then the garage.  The real system in
the house is one unit for the two story part that has gas heat, and the
garage has its own small heat pump unit.  Since most people don't flip their
thermostat back and forth between heat and cool, I don't want my systems
suddenly switching to heat for an hour in the middle of summer because one
of the zones got below set point.  I have now changed the system to a
chilled water loop and a hot water loop.  Where the hot water is provided by
a natural draft boiler and the chilled water is provided by a single effect
absorption chiller.  I am trying to create a loads file that will have the
load on the chiller rather than the load on each coil for each zone and also
the heating load for all the zones, but I don't want it to be able to change
from cooling to heating in the cooling season or vice versa.  Does that
makes sense?  Thanks

On Thu, Feb 3, 2011 at 11:19 AM, Nick Caton <ncaton at smithboucher.com> wrote:

Cory, your query needs more description to include what you're trying to
model and what you've input, but if you've got simultaneous calls for
heating and cooling being handled, it sounds like you have either a
multi-zone system or multiple systems specified where you want only (1)
single-zone system.  

 

If I were trying to model the behavior of the HVAC in my apartment
accurately (a simple CV electric furnace with DX cooling controlled by a
single remote thermostat), I'd group all conditioned spaces and their zones
under a single system, taking care to assign the thermostat zone where the
thermostat actually resides - it's the zone highlighted red in the graphic
under the airside HVAC tab.

 

I'd suggest revisiting the quantity and type of system you've specified
first, and modify/reassign your systems/zones as necessary to see if that's
where the problem resides.  If you're still having troubles, you'll need to
provide a better description of what sort of system you're trying to model
(layman's terms are fine in this forum) and what you've tried to specify on
the model side.  Attaching your project's .inp/.pd2 files may encourage
others to help troubleshoot also ;).

 

Best of luck!

 

~Nick

 

Error! Filename not specified.

 

NICK CATON, E.I.T.

PROJECT ENGINEER

Smith & Boucher Engineers

25501 west valley parkway

olathe ks 66061

direct 913 344.0036

fax 913 345.0617

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

 

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Cory Duggin
Sent: Wednesday, February 02, 2011 4:07 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] HVAC System Lockout

 

Is there a way I can create a schedule to lockout either the heating or
cooling system based on the time of year?  I am modeling a residential
system, so I don't want it to try and satisfy heating a cooling loads
simultaneously in different zones.  Thanks

-- 
Cory Duggin, EI
Tennessee Tech University
Graduate Research Assistant
Mechanical Engineering




-- 
Cory Duggin, EI
Tennessee Tech University
Graduate Research Assistant
Mechanical Engineering




-- 
Cory Duggin, EI
Tennessee Tech University
Graduate Research Assistant
Mechanical Engineering


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-- 

 

Arpan Bakshi

646 704-2880 

 

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