| View previous topic :: View next topic |
| Author |
Message |
chartley
Posts: 6
|
 Posted: Thu Jan 26, 2012 4:14 am Post subject: SEVERE: Node Connects to no component |
 |
|
Hello,
I am trying to model a two story building with one dedicated AHU per floor. After working through several other errors, I can make it to the "System Sizing Calculation" and I receive two "Severe" errors. This is what the error message contains: | Quote: | ** Severe ** Node SECOND FLOOR AHU ZONE SPLITTER OUTLET NODE 3 connects to no component
** ~~~ ** Occurs in Supply Air Path=SECOND FLOOR AHU DEMAND SIDE SUPPLY PATH 1
** ~~~ ** Check the connection to a ZoneHVAC:EquipmentConnections object
** ~~~ ** Check if this component is missing from the Supply Air Path
** Severe ** Node SECOND FLOOR AHU ZONE SPLITTER OUTLET NODE 4 connects to no component
** ~~~ ** Occurs in Supply Air Path=SECOND FLOOR AHU DEMAND SIDE SUPPLY PATH 1
** ~~~ ** Check the connection to a ZoneHVAC:EquipmentConnections object
** ~~~ ** Check if this component is missing from the Supply Air Path
** Fatal ** Preceding errors cause termination
...Summary of Errors that led to program termination:
..... Reference severe error count=2
..... Last severe error=Node SECOND FLOOR AHU ZONE SPLITTER OUTLET NODE 4 connects to no component
************* Warning: Node connection errors not checked - most system input has not been read (see previous warning). |
I am working in detailed HVAC mode and I have approximately 25 zones per floor. I know that each zone is connected to the supply and return of the respective floor's AHU, so why I am still receiving this message? Thank you for the help!
Regards,
Chris
|
|
| Back to top |
|
 |
Steve Potter
Posts: 572
Location: newcastle |
| Posted: Thu Jan 26, 2012 8:52 am Post subject: |
|
|
Hi Chris,
Could you upload your model to the forum so that we can try to figure out what the problem is?
Regards,
Steve
|
|
| Back to top |
|
|
chartley
Posts: 6
|
| Posted: Thu Jan 26, 2012 5:09 pm Post subject: |
|
|
Steve,
Here you go! I am also surprised to see that the program is conducting system sizing calculations because I have specified the flow rate for each space and VAV. Thank you for the help.
Regards,
Chris
| Description: |
|
Download |
| Filename: |
MSTB(12JAN12).dsb |
| Filesize: |
2.21 MB |
| Downloaded: |
10 Time(s) |
|
|
| Back to top |
|
|
chartley
Posts: 6
|
| Posted: Thu Jan 26, 2012 11:20 pm Post subject: SEVERE Node Connection Errors |
|
|
Steve,
Another interesting item is that these errors do not appear on the First Floor AHU supply sub loop, only the Second Floor AHU supply sub loop. I have tried several connection configurations including attaching zone 1 to demand node one and supply node one, as well as attaching zone 1 to demand node one and supply node 39 (number of zones in my model). It is strange because each time I re-run the model, the Zone connection error node increases by one. The first time nodes 3 and 4 were not connected, then nodes 4 and 5 were not connected. I added extra splitters on the supply and return side, and that worked except that the program encountered severe errors when trying to match splitter to splitter instead of splitter to mixer. Do you have any thoughts? Thanks!
Chris
|
|
| Back to top |
|
|
Steve Potter
Posts: 572
Location: newcastle |
| Posted: Fri Jan 27, 2012 9:02 am Post subject: |
|
|
Chris,
We are looking into the problem with your model at the moment but in the meantime I can suggest a possible workaround.
The system that you have defined is much more complicated that it needs to be and you can simplify it quite easily by combining zones with the same equipment configurations into single zone groups. The idea behind zone groups is to simplify systems such as the one that you are investigating. For example if you have 50 zones all served by convectors, you can create one zone group and associate all 50 zones with that zone group using the General tab on the zone group dialog. Then you only need to add a single convector to one of the constituent zones and define a single set of connections to the zone group convector. You can then edit the zone settings and zone convector settings for each constituent zone separately by stepping down to each required zone in the zone group.
In the case of your system , you only need 3 zone groups for the FIRST FLOOR AHU (rather than the 29 that you are currently using) and 3 zone groups for the SECOND FLOOR AHU (rather than the 33 that you have defined). I think if you make this modification, the connection error that you are experiencing will probably disappear.
In the meantime, we will look into fixing the problem that you reported.
Hope this is of help.
Regards,
Steve
|
|
| Back to top |
|
|
Steve Potter
Posts: 572
Location: newcastle |
| Posted: Sat Jan 28, 2012 2:19 pm Post subject: |
|
|
Chris,
Just to let you know that this problem has now been fixed and the fix will be available in the next update of the software (following version 3.0.0.099).
Steve
|
|
| Back to top |
|
|
|
FAQ
Search
Log in to check your private messages
Usergroups
