Re: [EnergyPlus_Support] Passive houses: Subsoil heat exchanger and heat recovery

["Michael J. Witte" <mjwitte@xxxxxxxx>]

There are some restrictions on how certain components and loops can be 
combined.  Can you send me a schematic diagram of the system you are trying to 
model?  A copy of the idf file would also be helpful.  Files may be uploaded to 
the files area in the yahoo group, or sent as an e-mail attachment to 
energyplus-support@xxxxxxxx.  The error message indicates that 
Node="Recup_Out_R_B0" has not been specified as a zone return air node in a 
CONTROLLED ZONE EQUIP CONFIGURATION object.

Mike


On 14 Mar 2005, at 16:24, massimiliano_scarpa wrote:

> 
> 
> Good morning/evening to You all.
> I am an Italian Ph.D. Student in Energetics, so I apologize for my 
> rough English.
> I am going to use EnergyPlus for studying Passive Houses.
> The plant I would like to simulate is reduced to an air loop, 
> composed by:
> - 1 Subsoil heat exchanger (passed through by the outside air) per 
> building, for preheating (in winter) or precooling (in summer) the 
> outside air stream
> - 1 fan per flat
> - 1 Heat exchanger per flat
> 
> This way, the Air loop is composed by the Outside Air Mixer alone.
> The Supply Air Path has a Supply plenum that simulates the subsoil 
> heat exchanger with appropriate boundary conditions (since a Subsoil 
> heat exchanger Routine is not present) and is connected to the zone 
> equipment of each flat.
> The Return Air Path consists of a Return Mixer that collects the 
> return airflow from each flat.
> Finally, each flat has the following zone distribution parts: 1 fan, 
> 1 VAV NoReheat, the supply side of the Heat Recovery Flat Plate 
> Exchanger, the zone itself and the secondary side of the Heat 
> Recovery Flat Plate Exchanger.
> 
> Unfortunately, for each flat I receive the such error:
> <<Error in Node="Recup_Out_R_B0", Inlet node did not find an 
> appropriate matching "outlet" node
> Reference object=Zone mixer, Name=Mixer>>
> 
> At this point, I wonder whether the return part of the Zone 
> equipment accepts heat recovery units or not.
> I know there is the ERV Stand Alone for similar purposes, but it 
> acts on the mere exhaust air stream, not on the return air stream. I 
> need the air loop for using the plenum, instead. The plenum, in 
> fact, allows me to take into account the thermal inertia of the 
> ground and its possible overheating (in summer) or overcooling (in 
> winter), due to a short length of the Subsoil heat exchanger.
> So I see two possible solutions:
> 1) To simulate the subsoil heat exchanger in another way, but the 
> only one I find reasonable is the use of an appropriate heat 
> exchanger that precools or preheats the outside air. But this way I 
> could not take into account the thermal saturation of the ground.
> 2) To use the ERV and the Air Loop together. So the Outside Air 
> enters through the Outside Air Mixer, then goes to the zone and 
> exits through the exhaust stream path. The return air has a flow 
> rate equal to 0 and is a fictious link to the Return Air Path. Could 
> it be right?
> 
> Have You a better way for dealing with this kind of simulation?
> 
> I thank You all for Your Kind Attention and hope in good news
> 
> Massimiliano Scarpa
> 
> 
> 
> 
> 
> 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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