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Re: [EnergyPlus_Support] out-of-range warning
For object COIL:DX:COOLINGBYPASSFACTOREMPIRICAL, the IO Reference says
that the rated air volume flow rate must be between 0.00004699 m3/s and
0.00006041 m3/s per watt of rated total cooling capacity.
Below, you say that you have 0.6 m3/s for rated air volume flow rate,
and 14000 Watts for rated total cooling capacity (Gross).
(0.6 m3/s) / (14000 W) = .00004286 m3/s/W which is outside of the
acceptable range.
Try reducing the Rated Total Cooling Capacity or increasing the Rated
Air Volume Flow Rate.
eric_zhou1223 wrote:
> 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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