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How to fix the node connection error

asked 2018-12-19 01:01:18 -0500

updated 2018-12-20 09:52:19 -0500

eplusout.err:

Program Version,EnergyPlus 6.0.0.023, 19-12-2018 11:38,IDD_Version 6.0.0.023
************* Beginning Zone Sizing Calculations
** Warning ** SizingPeriod:DesignDay: AHMEDABAD:1.0% WINTER
**   ~~~   **   Humidity Indicator Temperature at Max Temp=12.8 > Max DryBulb=12.2
**   ~~~   **   Humidity Indicating Type=WETBULB
**   ~~~   **   Conditions for day will be set to Relative Humidity = 100%
** Warning ** Zone areas*inside surface emissivities are summing to zero, for Zone="Z1"
**   ~~~   ** As a result, MRT will be set to MAT for that zone
************* Beginning System Sizing Calculations
** Warning ** Could not find chilled water coil with name SYSFANPWRVAV_SYS 1 COOLING COIL on any plant loop
**   ~~~   ** Autosizing of water coil requires a cooling loop Sizing:Plant object
**   ~~~   ** Occurs in water coil object= SYSFANPWRVAV_SYS 1 COOLING COIL
**  Fatal  ** Preceeding water coil sizing errors cause program termination
...Summary of Errors that led to program termination:
..... Reference severe error count=0
..... Last severe error=
************* Fatal error -- final processing.  More error messages may appear.
************* Testing Individual Branch Integrity
** Warning ** There are orphaned Branches in input
************* All Branches passed integrity testing
************* Testing Individual Supply Air Path Integrity
************* All Supply Air Paths passed integrity testing
************* Testing Individual Return Air Path Integrity
************* All Return Air Paths passed integrity testing
** Severe  ** Node Connection Error, Node="SYSFANPWRVAV_SYS 1 COOLING COIL CHW INLET", Inlet node did not find an appropriate matching "outlet" node.
**   ~~~   ** If this is an outdoor air inlet node, it must be listed in an OutdoorAir:Node or OutdoorAir:NodeList object.
**   ~~~   ** Reference Object=BRANCH, Name=SYSFANPWRVAV_SYS 1 COOLING COIL CHW BRANCH
** Severe  ** Node Connection Error, Node="SYSFANPWRVAV_SYS 1 HEATING COIL HW INLET", Inlet node did not find an appropriate matching "outlet" node.
**   ~~~   ** If this is an outdoor air inlet node, it must be listed in an OutdoorAir:Node or OutdoorAir:NodeList object.
**   ~~~   ** Reference Object=BRANCH, Name=SYSFANPWRVAV_SYS 1 HEATING COIL HW BRANCH
** Severe  ** Node Connection Error, Node="SYSFANPWRVAV_SYS 1 HEATING COIL HW INLET", Inlet node did not find an appropriate matching "outlet" node.
**   ~~~   ** If this is an outdoor air inlet node, it must be listed in an OutdoorAir:Node or OutdoorAir:NodeList object.
**   ~~~   ** Reference Object=COIL:HEATING:WATER, Name=SYSFANPWRVAV_SYS 1 HEATING COIL
** Severe  ** Node Connection Error, Node="SYSFANPWRVAV_SYS 1 COOLING COIL CHW INLET", Inlet node did not find an appropriate matching "outlet" node.
**   ~~~   ** If this is an outdoor air inlet node, it must be listed in an OutdoorAir:Node or OutdoorAir:NodeList object.
**   ~~~   ** Reference Object=COIL:COOLING:WATER, Name=SYSFANPWRVAV_SYS 1 COOLING COIL
************* There were 4 node connection errors noted.
*************
************* ===== Final Error Summary =====
************* The following error categories occurred.  Consider correcting or noting.
************* Node Connection Errors
************* ..Node connection errors are often caused by spelling mistakes in a node name field.
************* ..To track down the problem, search the idf file for each node name listed to see if it
************* ..occurs in the expected input fields.
*************
************* EnergyPlus Warmup Error Summary. During Warmup: 0 Warning; 0 Severe Errors.
************* EnergyPlus Sizing Error Summary. During Sizing: 2 Warning; 0 Severe Errors.
************* EnergyPlus Terminated--Fatal Error Detected. 4 Warning; 4 Severe Errors; Elapsed Time=00hr 00min  2.42sec
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Did you read your error file? It has plenty of valuable information to start looking at your problem.

Julien Marrec gravatar imageJulien Marrec ( 2018-12-19 02:42:38 -0500 )edit

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answered 2018-12-19 12:09:22 -0500

updated 2018-12-19 12:10:54 -0500

In general, any Fatal messages are indicating what causes your simulation to fail. From your error file messages:

** Warning ** Could not find chilled water coil with name SYSFANPWRVAV_SYS 1 COOLING COIL on any plant loop
**   ~~~   ** Autosizing of water coil requires a cooling loop Sizing:Plant object
**   ~~~   ** Occurs in water coil object= SYSFANPWRVAV_SYS 1 COOLING COIL
**  Fatal  ** Preceding water coil sizing errors cause program termination

So, the Fatal message is saying that a water coil sizing error in the preceding lines above is causing EnergyPlus to stop the simulation. The preceding lines say that a chilled water coil named SYSFANPWRVAV_SYS 1 COOLING COIL is defined in the model, but it is not connected to any plant loop (term EnergyPlus uses for a liquid loop like hot water plant or chilled water plant).

This issue is repeated in two of the Severe error messages in your error file:

** Severe  ** Node Connection Error, Node="SYSFANPWRVAV_SYS 1 COOLING COIL CHW INLET", Inlet node did not find an appropriate matching "outlet" node.
**   ~~~   ** If this is an outdoor air inlet node, it must be listed in an OutdoorAir:Node or OutdoorAir:NodeList object.
**   ~~~   ** Reference Object=BRANCH, Name=SYSFANPWRVAV_SYS 1 COOLING COIL CHW BRANCH
** Severe  ** Node Connection Error, Node="SYSFANPWRVAV_SYS 1 COOLING COIL CHW INLET", Inlet node did not find an appropriate matching "outlet" node.
**   ~~~   ** If this is an outdoor air inlet node, it must be listed in an OutdoorAir:Node or OutdoorAir:NodeList object.
**   ~~~   ** Reference Object=COIL:COOLING:WATER, Name=SYSFANPWRVAV_SYS 1 COOLING COIL

EnergyPlus connects HVAC components together through Inlet Node Name and Outlet Node Name input fields. You have defined your cooling coil object with an Inlet Node Name set to SYSFANPWRVAV_SYS 1 COOLING COIL CHW INLET, and somewhere else in the model another HVAC component object should have it's Outlet Node Name also set to SYSFANPWRVAV_SYS 1 COOLING COIL CHW INLET. This tells EnergyPlus where the water entering the chilled water coil comes from.

It looks like you have a similar issue with a hot water coil as well:

** Severe  ** Node Connection Error, Node="SYSFANPWRVAV_SYS 1 HEATING COIL HW INLET", Inlet node did not find an appropriate matching "outlet" node.
**   ~~~   ** If this is an outdoor air inlet node, it must be listed in an OutdoorAir:Node or OutdoorAir:NodeList object.
**   ~~~   ** Reference Object=BRANCH, Name=SYSFANPWRVAV_SYS 1 HEATING COIL HW BRANCH
** Severe  ** Node Connection Error, Node="SYSFANPWRVAV_SYS 1 HEATING COIL HW INLET", Inlet node did not find an appropriate matching "outlet" node.
**   ~~~   ** If this is an outdoor air inlet node, it must be listed in an OutdoorAir:Node or OutdoorAir:NodeList object.
**   ~~~   ** Reference Object=COIL:HEATING:WATER, Name=SYSFANPWRVAV_SYS 1 HEATING COIL

If you used an interface to create your model, make sure that these chilled water and hot water coils are properly connected to their respective plant loops. This post also offers some tips on addressing node connection issues for plant loop HVAC components.

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Asked: 2018-12-19 01:01:18 -0500

Seen: 318 times

Last updated: Dec 19 '18