repeated warnings slowing down simulation time #11214
Description
General Summary
summary:
I'm hoping if EnergyPlus could wrap/suppress millions of (somewhat unnecessary) warnings (if there are any) at the end of the simulation instead of printing out in each timestep slowing down the simulation time significantly.
Detailed Description
background:
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I was modeling a rooftop unit that reflects the latest products' performances.
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when running simulation I was getting 60M of these warnings below slowing down the simulation time by a lot:
** Warning ** For object = Coil:Cooling:DX:VariableSpeed, name = "ZONE OUTPATIENT CAFE A - STORY GROUND PSZ-AC ADV RTU COOLING COIL"
** ~~~ ** Calculated outlet air relative humidity greater than 1. 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.
** ~~~ ** ...Inputs used for calculating cooling coil bypass factor.
** ~~~ ** ...Inlet Air Temperature = 26.67 C
** ~~~ ** ...Outlet Air Temperature = 9.59 C
** ~~~ ** ...Inlet Air Humidity Ratio = 1.118470E-002 kgWater/kgDryAir
** ~~~ ** ...Outlet Air Humidity Ratio = 9.616336E-003 kgWater/kgDryAir
** ~~~ ** ...Total Cooling Capacity used in calculation = 323.85 W
** ~~~ ** ...Air Mass Flow Rate used in calculation = 1.508563E-002 kg/s
** ~~~ ** ...Air Volume Flow Rate used in calculation = 1.304142E-002 m3/s
** ~~~ ** During Warmup, Environment=HOUSTON DW HOOKS ANN CLG .4% CONDNS DB=>MWB 1, at Simulation time=08/21 00:00 - 00:15
** ~~~ ** CalcCBF: SHR adjusted to achieve valid outlet air properties and the simulation continues.
** ~~~ ** CalcCBF: initial SHR = 0.81366
** ~~~ ** CalcCBF: adjusted SHR = 0.70135
- I double checked the data from manufacturers, as shown below, and I believe those rated values in each stage that I used are what I want:
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And, if I'm understanding the reason of the warning correctly, I think the RH-over-100% warning seems unnecessary because, in reality, the coil will just condensate.
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I'm assuming the warning is because of this:
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air gets cooled in the cooling coil from inlet air condition (solid circle on the right)
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based on specs I specified in the coil object, the outlet condition should be at the dotted circle (which is physically not possible)
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but because it is not physically possible,
- the outlet air condition follows through the saturation curve (which is correct and how it should be done) and results in solid circle on the left.
- and, at the same time, throws a warning (which I think is unnecessary)
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example model attached
Possible Implementation
- don't print out some of these unnecessary warnings
- but wrap/summarize at the end so that we still can track