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Re: [EnergyPlus_Support] A large number of cooling unmet load hours
The Zone:Sizing and System:Sizing objects are used to input information
concerning sizing. Review these inputs carefully.
The advice was to compare these values with values calculated during the
simulation.
Such as:
Output:Variable,"The name of the supply air node",Zone/Sys Air
Temperature,Hourly;
Output:Variable,"The name of the supply air node",Zone Air Humidity
Ratio,Hourly;
where: "The name of the supply air node" is the node name you gave as
the outlet of the main AC duct, or cooling coil outlet node, etc.
john_lee68@xxxxxxxxxxx wrote:
>
> I am still looking for the response...
> Thanks,
> John..
> ----- Original Message -----
> From: "john lee68" <john_lee68@xxxxxxxxxxx>
> To: "EnergyPlus Support" <EnergyPlus_Support@xxxxxxxxxxxxxxx>
> Sent: Wednesday, January 27, 2010 5:45:55 PM GMT -05:00 US/Canada Eastern
> Subject: Re: [EnergyPlus_Support] A large number of cooling unmet load
> hours
>
> Thank you Brent for your quick response. Which input (or output)
> variable, are you referring to? If it is output variable then how can
> I make sure that these two temperatures are not different.
>
> thanks again...
> John
>
> ----- Original Message -----
> From: "Brent Griffith" <brent.griffith@xxxxxxxx>
> To: "EnergyPlus Support" <EnergyPlus_Support@xxxxxxxxxxxxxxx>
> Sent: Tues
>
> This sort of thing is usually caused by a mismatch between the
> parameters used in Sizing:* objects and how the systems actually run
> during operation. The HVAC controls need to be consistent with the
> Sizing inputs. For example, check that the node temperatures on the
> supply deck agree with what is used in the Sizing:Zone design supply
> air temperature.
>
>
>
> ------------------------------------------------------------------------
>
> *From:* EnergyPlus_Support@xxxxxxxxxxxxxxx
> [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] *On Behalf Of
> *john_lee68@xxxxxxxxxxx
> *Sent:* Tuesday, January 26, 2010 3:48 PM
> *To:* EnergyPlus Support
> *Subject:* [EnergyPlus_Support] A large number of cooling unmet load hours
>
>
>
>
>
> Hello everyone,
>
> I am simulating an office building with VAV with Reheat. I am getting
> a large number of unmet cooling load hours. The heating is fine. I am
> running it for Chicago weather.
>
> TIME COOLING SETPOINT NOT MET {HOURS NON-ZERO} [HOURS]
>
>
>
> I am using autosize options. My understanding was that it I use
> autosize options, the systems would be sized to meet the loads.
> How should I diagnose this - i.e. which parameters to look at etc..
>
>
>
> I help will be very much appreciated...
>
> John
>
>
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