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Re: [EnergyPlus_Support] Re: Run around coil for air loop

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] Re: Run around coil for air loop
From: "Michael J. Witte" <mjwitte@xxxxxxxx>
Date: Tue, 25 Jan 2005 12:57:10 -0600
Delivered-to: linda:lawrie.com@xxxxxxxxxxxxxxx
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In-reply-to: <BE1C3A5E.758%sam@energysolutions.co.nz>
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When faced with node connection errors, the first thing to try is searching the 
idf file for the node names mentioned in the error message.  For example, the 
first error is

   ** Severe  ** Error in Node="MAIN HEATING COIL 1 OUTLET NODE", Inlet node 
did not find an appropriate matching "outlet" node.
   **   ~~~   ** Reference Object=COIL:WATER:COOLINGHEATEXCHANGERASSISTED, 
Name=HEAT EXCHANGER ASSISTED COOLING COIL 1

Searching for "MAIN HEATING COIL 1 OUTLET NODE" in the idf file finds only one 
occurence:

COIL:Water:CoolingHeatExchangerAssisted,
    Heat Exchanger Assisted Cooling Coil 1,  !- Name of the heat exchanger 
assisted cooling coil
    Main Heating Coil 1 Outlet Node,  !- Inlet node name

If a node name only appears once, that is a sure sign it is probably wrong 
(unless it is a zone air node).  Almost every other type of node should be used 
in more than one place.  I believe this is supposed to be "Main Heating Coil 
Outlet Node 1"?  Hopefully this should help you track down any other remaining 
node connection errors.

Mike


On 25 Jan 2005, at 18:03, Sam Roose wrote:

> 
> Thanks Don. You were right first time  a heat exchanger assisted cooling
> coil was what I was after.
> I have uploaded a progress file to the ³Problem Submittals/ Sam Roose
> folder² which runs, but has some node connection errors (I am not concerned
> about the other erros at this stage). I have made an attempt at the air loop
> branches (there are two separate loops), however I am not sure that putting just
> the fan, heating coil and heat exchange assisted coil onto this branch is
> sufficient. The one example file I have found for this (which uses
> FurnaceHeatCool) uses the Air Loop Outlet Node as the exhaust node for the heat
> exchanger air but there appears to be a problem with this node in my file. How
> can I get rid of these node connection errors? Thanks in advance Sam Roose
> Energy Solutions Ltd.
> 
> On 1/22/05 1:59 AM, "donbshireyiii" <shirey@xxxxxxxxxxxx> wrote:
> 
> > 
> > Sam,
> > 
> > I'm not sure if E+ is able to model what you are proposing.
> > 
> > However, I do know that you can use the object
> > COIL:Water:CoolingHeatExchangerAssisted which uses the chilled water
> > cooling coil along with a sensible heat exchanger (Heat Exchanger:Air
> > to Air:Flat Plate or Heat Exchanger:Air to Air:Generic)
> > to improve the dehumidification performance of the cooilng coil by
> > pre-cooling the air entering the cooling coil, and then reheating the
> > air leaving the cooling coil. While this doesn't have a "pump"
> > associated with it, you might be able to use it anyway to meet your
> > needs. See the documentation (IO Ref and Engineering Doc) for
> > information regarding its use.
> > 
> > Also, there is an example file called
> > FurnaceWithDXSystem_CoolingHXAssisted.idf which shows how the similar
> > object COIL:DX:CoolingHeatExchangerAssisted is used for a direct
> > expansion (DX) cooling coil. This example might be helpful for you to
> > see how the heat exchanger supply and exhaust air nodes are hooked up
> > correctly in the air loop (i.e., supply side of the heat exchanger is
> > the "precool" coil and the exhaust side of the heat exchanger is the
> > "reheat" coil).
> > 
> > Don
> > 
> > 
> > 
> > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Sam Roose <sam@e...> wrote:
> >> > I have just uploaded a file attempting to employ a run around coil
> > in an air
> >> > loop (named "9run_around_coil_attempt.idf" in the "Problem
> > Submittals/Sam
> >> > Roose" folder. I haven't found any examples for this as yet but the
> > order of
> >> > elements in the air loop should be:
> >> > 
> >> > Supply fan (blowing air through at around 23 degrees in summer)
> >> > Main heating coil (taking hot water from a boiler - maintaining 23
> > degrees
> >> > in summer as it is switched off)
> >> > Run around cooling coil (cooling to around 18 degrees)
> >> > Main cooling coil (taking chilled water from a chiller and cooling
> > to 10
> >> > degrees)
> >> > Run around heating coil (Heating to 15 degrees would allow 15 degree
> > water
> >> > to come back to the run around cooling coil thus reducing cooling
> > load -
> >> > this is done using a pump).
> >> > 
> >> > I am not sure what this run around system would require in the way
> > of a
> >> > water loop, and how the heat recovery could be simulated. Any help
> > on this
> >> > is much appreciated.
> >> > 
> >> > Sam Roose
> >> > Energy Solutions Ltd.
> > 
> > 
> > 
> > 
> > 
> > The primary EnergyPlus web site is found at:
> > http://www.energyplus.gov
> > 
> > The group web site is:
> > http://groups.yahoo.com/group/EnergyPlus_Support/
> > 
> > Attachments are not allowed -- please post any files to the appropriate folder
> > in the Files area of the Support Web Site.
> > 
> > 
> > 
> > 
> > Yahoo! Groups Links
> > * To visit your group on the web, go to:
> > * http://groups.yahoo.com/group/EnergyPlus_Support/
> > *  
> > * To unsubscribe from this group, send an email to:
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> > * Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service
> > <http://docs.yahoo.com/info/terms/> .
> > 
> 
> 
> 
> 
> [Non-text portions of this message have been removed]
> 
> 
> 
> The primary EnergyPlus web site is found at:
> http://www.energyplus.gov
> 
> The group web site is:
> http://groups.yahoo.com/group/EnergyPlus_Support/
> 
> Attachments are not allowed -- please post any files to the appropriate folder
> in the Files area of the Support Web Site.
> 
> Yahoo! Groups Links
> 
> 
> 
> 
> 
> 
> 
> 
> 



========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx




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References:
- [EnergyPlus_Support] Re: Run around coil for air loop
  - From: donbshireyiii
- Re: [EnergyPlus_Support] Re: Run around coil for air loop
  - From: Sam Roose

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