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Re: [EnergyPlus_Support] Convergence Error - Warning - Exhaust fan (using HVAC Compact Object)
!) Loads Initialization did not converge error is only telling you that
after 25 iterations, the maximum temperature comparison was only 0.036 C
with a tolerance of 0.02 C. This will not hurt your simulation, it just
means that during warmup, the simulation was unable to find a repeatable
starting temperature. You may be able to increase the number of warmup
days to get rid of this error.
2) The generic HX should not be used when air flow ratios are below 50%
of the nominal flow rate. The warning says the ratio is 0.05. This is to
low for accurate results. If this is an error, fix the cause and run the
simulation again. You could also change to a flat plate HX if the flow
ratio is actually required.
3) You must add exhaust fans to your simulation. Just enter the Zone
Exhaust Fan object, give it a schedule, and enter the exhaust fan inlet
node name in a Controlled Zone Equip Configuration object. The exhaust
fan inlet node name in the fan object is an exhaust node name in the
controlled zone equip configuration object..
4) Any valid report variable can be added to a custom meter. See the
documentation for help and examples.
André Lopes wrote:
>
> Dear E Plus Team
> In my error report the following messages appeared:
> What is the meaning? Is this important for the simulation results?
> ** Severe ** Loads Initialization did not Converge
> (CheckWarmupConvergence) after 25 warmup days.
> ** ~~~ ** ..Environment=COIMBRA - PRT IWEC DATA WMO#=085490
> ** ~~~ ** ..Max Temp Comparison=3.63E-002 vs Temperature
> Convergence Tolerance=2.00E-002 - Fail Convergence
> ** ~~~ ** ..Min Temp Comparison=5.00E-003 vs Temperature
> Convergence Tolerance=2.00E-002 - Pass Convergence
> ** ~~~ ** ..Max Heat Load Comparison=1.6990E-004 vs Loads
> Convergence Tolerance=2.00E-002 - Pass Convergence
> What is the meaning?
> ** Warning ** HEAT EXCHANGER:AIR TO AIR:GENERIC "AHU_2 HEAT RECOVERY"
> ** ~~~ ** Average air volume flow rate is <50% or >130% of the
> nominal HX supply air volume flow rate.
> ** ~~~ ** Air volume flow rate ratio = 4.958E-002. Occurrence
> info=COIMBRA - PRT IWEC DATA WMO#=085490, 01/17 08:00 - 09:00
> How can simulate exhaust fans (Kitchen, WC) using the HVAC Compact
> System? (I am using version 2.1)
> How should I select a certain variable and after that insert a
> meter to visualize it?
> How should I customize a meter report ?
> My Best Regards
> A L
>
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--
Richard A. Raustad
Senior Research Engineer
Florida Solar Energy Center
University of Central Florida
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