Fatal Error cause by zero heating (solve)

H.C · Posts: 9

I upgrade with new version but now I can't have this result.

It's write this :
"Program Version,EnergyPlusDLL 2.2.0.025, 23/07/2008 21:09,IDD_Version 2.2.0.025
************* Beginning Zone Sizing Calculations
** Warning ** GetGroundTemps: Some values for "GroundTemperatures" fall outside the range of 15-25C.
** ~~~ ** These values may be inappropriate. Please consult the Input Output Reference for more details.
** Warning ** An AirflowNetwork:Multizone:Surface object has an air-flow opening corresponding to
** ~~~ ** window or door = H_25910_1_0_0_0_0, which is within
** ~~~ ** 10 deg of being horizontal. Airflows through large horizontal openings are poorly
** ~~~ ** modeled in the AirflowNetwork model resulting in only one-way airflow."

then a lot of :
"** Warning ** Calculated design heating load for zone=25842 is zero.
** ~~~ ** Check ZONE SIZING and ZONE CONTROL:THERMOSTATIC inputs.
** Warning ** Calculated design heating load for zone=25851 is zero.
** ~~~ ** Check ZONE SIZING and ZONE CONTROL:THERMOSTATIC inputs.
** Warning ** Calculated design cooling load for zone=25881 is zero."

Then :
"** Severe ** Autosizing of heating coil UA failed for coil 25842 HEATING COIL
** ~~~ ** Bad starting values for UA
** ~~~ ** Inadequate water side capacity: in Plant Sizing for this hot water loop
** ~~~ ** increase design loop exit temperature and/or decrease design loop delta T
** Fatal ** Preceeding water coil sizing errors cause program termination
...Summary of Errors that led to program termination:
..... Reference severe error count=1
..... Last severe error=Autosizing of heating coil UA failed for coil 25842 HEATING COIL
************* 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="25842 COOLING COIL CHW INLET", Inlet node did not find an appropriate matching "outlet" node.
** ~~~ ** If this is an outside air inlet node, it must be listed in an OUTSIDE AIR NODE or OUTSIDE AIR INLET NODE LIST object.
** ~~~ ** Reference Object=BRANCH, Name=25842 COOLING COIL CHW BRANCH
** Severe ** Node Connection Error, Node="25842 HEATING COIL HW INLET", Inlet node did not find an appropriate matching"

and this :
"** ~~~ ** Reference Object=BRANCH, Name=HOT WATER LOOP HW SUPPLY BYPASS BRANCH
** Severe ** Node Connection Error, Node="HOT WATER LOOP HW SUPPLY INLET", Inlet node did not find an appropriate matching "outlet" node.
** ~~~ ** If this is an outside air inlet node, it must be listed in an OUTSIDE AIR NODE or OUTSIDE AIR INLET NODE "

Also :
" ** Warning ** Potential Node Connection Error for object PIPE, name=HOT WATER LOOP HW SUPPLY SIDE BYPASS PIPE
** ~~~ ** Node Types are still UNDEFINED -- See Branch/Node Details file for further information
** ~~~ ** Inlet Node : HOT WATER LOOP HW SUPPLY BYPASS INLET
** ~~~ ** Outlet Node: HOT WATER LOOP HW SUPPLY BYPASS OUTLET
** Warning ** Potential Node Connection Error for object PUMP:VARIABLE SPEED, name=HOT WATER LOOP HW SUPPLY PUMP
** ~~~ ** Node Types are still UNDEFINED -- See Branch/Node Details file for further information
** ~~~ ** Inlet Node : HOT WATER LOOP HW SUPPLY INLET
** ~~~ ** Outlet Node: HOT WATER LOOP HW PUMP OUTLET
"

and at the end :
" ************* ===== 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 Terminated--Fatal Error Detected. 64 Warning; 227 Severe Errors; Elapsed Time=00hr 07min 38.45sec"

Could-you explain-me and try to find where errors come from?

Thanks

H.C

lklawrie · Posts: 82

Basically, when you get a Fatal Error and then node connection errors, you should ignore those node connection errors until you fix the thing that caused the Fatal Error.

EnergyPlus receives the Fatal Error notice and then tries to do some "end program" processing but all of the things for proper node connections may not have been processed yet.

Andy Tindale · Posts: 1235 Location: Stroud

The errors are caused by zero heating system sizes on the HVAC tab under Heating. You have selected the Manual HVAC sizing option on the Model options dialog and this means you have to go to each zone and enter the appropriate heating capacity. I suggest that instead of Manual you use either Autosize or Autosize when not set.

As Linda says the rest of the errors are spurious as the whole system has not been read in due to the severe sizing errors.

Andy

H.C · Posts: 9

Thanks Andy Tindale. It works.

I just don't make link between Manual HVAC and all this errors.

H.C

Good luck for DB.2

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