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[EnergyPlus_Support] out-of-range warning
Hi,all,
When I study the case "windac.idf"in the example files, I change
the "Rated total cooling capacity(grass)" from 11200w to 14000w,
then many errors pop up.
-------------------------------------------
** Severe ** Sizing:
COIL:DX:COOLINGBYPASSFACTOREMPIRICAL "ZONE1WINDACDXCOIL": Rated air
volume flow rate per watt of rated total cooling capacity is out of
range. See Input-Output Reference Manual for valid range.
** Severe ** For object = COIL:DX:COOLINGBYPASSFACTOREMPIRICAL,
name = "ZONE1WINDACDXCOIL", the combination of
** ~~~ ** rated air volume flow rate, total cooling capacity
and sensible heat ratio yields coil exiting
** ~~~ ** air conditions above the saturation curve. Possible
fixes are to reduce the rated total cooling
** ~~~ ** capacity, increase the rated air volume flow rate,
or reduce the rated sensible heat ratio for this coil.
** ~~~ ** If autosizing, it is recommended that all three of
these values be autosized.
** ~~~ ** Occurrence info=CHANUTE AFB ILLINOIS SUMMER, 07/21
00:10 - 00:20
** Fatal ** Check and revise the input data for this coil
before rerunning the simulation.
************* 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
** Warning ** Node Connection errors shown during "fatal error"
processing may be false because not all inputs may have been
retrieved.
** Warning ** Potential Node Connection Error for object
PUMP:VARIABLE SPEED, name=HW CIRC PUMP
** ~~~ ** Node Types are still UNDEFINED -- See Branch/Node
Details file for further information
** ~~~ ** Inlet Node : HW SUPPLY INLET NODE
** ~~~ ** Outlet Node: HW PUMP OUTLET NODE
** Warning ** Potential Node Connection Error for object
PURCHASED:HOT WATER, name=PURCHASED HEATING
** ~~~ ** Node Types are still UNDEFINED -- See Branch/Node
Details file for further information
** ~~~ ** Inlet Node : PURCHASED HEAT INLET NODE
** ~~~ ** Outlet Node: PURCHASED HEAT OUTLET NODE
** Warning ** Potential Node Connection Error for object PIPE,
name=HEATING SUPPLY SIDE BYPASS
** ~~~ ** Node Types are still UNDEFINED -- See Branch/Node
Details file for further information
** ~~~ ** Inlet Node : HEATING SUPPLY BYPASS INLET NODE
** ~~~ ** Outlet Node: HEATING SUPPLY BYPASS OUTLET NODE
** Warning ** Potential Node Connection Error for object PIPE,
name=HEATING SUPPLY OUTLET
** ~~~ ** Node Types are still UNDEFINED -- See Branch/Node
Details file for further information
** ~~~ ** Inlet Node : HEATING SUPPLY EXIT PIPE INLET NODE
** ~~~ ** Outlet Node: HW SUPPLY OUTLET NODE
** Warning ** Potential Node Connection Error for object PIPE,
name=ZONESHWINLETPIPE
** ~~~ ** Node Types are still UNDEFINED -- See Branch/Node
Details file for further information
** ~~~ ** Inlet Node : HW DEMAND INLET NODE
** ~~~ ** Outlet Node: HW DEMAND ENTRANCE PIPE OUTLET NODE
** Warning ** Potential Node Connection Error for object PIPE,
name=ZONESHWOUTLETPIPE
** ~~~ ** Node Types are still UNDEFINED -- See Branch/Node
Details file for further information
** ~~~ ** Inlet Node : HW DEMAND EXIT PIPE INLET NODE
** ~~~ ** Outlet Node: HW DEMAND OUTLET NODE
** Warning ** Potential Node Connection Error for object PIPE,
name=ZONESHWBYPASSPIPE
** ~~~ ** Node Types are still UNDEFINED -- See Branch/Node
Details file for further information
** ~~~ ** Inlet Node : ZONESHWBYPASSINLETNODE
** ~~~ ** Outlet Node: ZONESHWBYPASSOUTLETNODE
************* There were 7 node connection errors noted.
*************
************* ===== Final Error Summary =====
************* The following error categories occurred. Consider
correcting or noting.
************* Node Connection Errors
*************
************* EnergyPlus Terminated--Fatal Error Detected. 9
Warning; 2 Severe Errors
---------------------------------------------------------------------
----------------------------
I compute the " rated volumetric air flow per watt of rated total
cooling
capacity", and the result is right in this range (350 ¨C 450
cfm/ton). Both rated values can be found in the
Coil:DX:CoolingBypassFactorEmirical.
(0.6m3/s)/(14000w). It looks good. Then what 's wrong with it?
I also try autosizing all three of these value, more warinings
appear, still reading this sort of range-out warning (all focus on
one zone).
Thank you for your help
Eric
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