Re: [EnergyPlus_Support] Set point not met

[Emanuel Sá <necas@xxxxxxxxxxx>]

Hi

Thanks, that worked just fine!!

I have one other problem.
In this building that i'm simulating, there are high internal gains, so it 
requires cooling all year. It also requires humidity control so I instaled a 
terminal reheat coil and a boiler.
In the design file (eio) says that the design hot water flow is " Design 
Boiler Water Flow Rate [m3/s],  0.31956E-02" which is 3.1956 kg/s aprox. 
however, in the spreadsheet I see that the demand bypass flow is never less 
than 3.17 kg/s !!! so, I dont understand how this design flow rate is 
possible! the gas consuming is almost equal to the chiller electric 
consuming!!
Am'I doing anything wrong?

Thank you very much!


----- Original Message ----- 
From: "Michael J. Witte" <mjwitte@xxxxxxxx>
To: <EnergyPlus_Support@xxxxxxxxxxxxxxx>
Sent: Wednesday, November 23, 2005 9:26 PM
Subject: Re: [EnergyPlus_Support] Set point not met


> Yes, a properly autosized system should be able to meet the zone setpoints 
> on
> the design days.  Things to check:
>
> 1.  If using coil:water:cooling, we have recently learned that it may not 
> size
> properly if the design delta humidity ratio is less than 0.01.  Check the
> component sizing report for the cooling coil(s) in the eio output file. 
> If the
> design entering minus leaving humidity ratio is smaller than 0.01, change 
> to
> using the COIL:Water:DetailedFlatCooling
>
> 2.  Is the supply air temperature setpoint being met?  The design supply 
> air
> temperatures in the sizing objects must match the setpoint controls in the
> simulation.
>
> 3.  Are the chillled water/hot water supply setpoints being met?  Again, 
> the
> setpoint controls must match the specifications in the plant sizing 
> objects.
>
> 4.  Also check availability schedules.
>
> Mike
>
>
> On 23 Nov 2005, at 5:07, dust_broom wrote:
>
>> Dear all.
>>
>> I've simulated a cooling system for a 4 zone bilding using a chiller a
>> boiler(for reheat), coils and a single duct . Every component was
>> suposed to be autosized. So I did the autosize. But than, in the
>> results I saw that only one of the four zones had its temperature
>> correct. the others were floating arround 6 degrees. Even in the
>> design day simulation some zones were too hot. shouldn't the design
>> day be sizing those equipments in order to maintain the zone
>> temperatura as specified? Am I doing anything wrong?
>>
>> Thank you, Emanuel
>>
>>
>>
>>
>>
>>
>> The primary EnergyPlus web site is found at:
>> http://www.energyplus.gov
>>
>> The group web site is:
>> http://groups.yahoo.com/group/EnergyPlus_Support/
>>
>> Attachments are not allowed -- please post any files to the appropriate 
>> folder
>> in the Files area of the Support Web Site.
>>
>> EnergyPlus Documentation is searchable.  Open EPlusMainMenu.idf and press 
>> the
>> "search" button.
>>
>> Yahoo! Groups Links
>>
>>
>>
>>
>>
>>
>>
>>
>
>
>
> ========================================================
> Michael J. Witte, GARD Analytics, Inc.
> EnergyPlus Testing and Support
> EnergyPlus-Support@xxxxxxxx
>
>
>
>
>
> The primary EnergyPlus web site is found at:
> http://www.energyplus.gov
>
> The group web site is:
> http://groups.yahoo.com/group/EnergyPlus_Support/
>
> Attachments are not allowed -- please post any files to the appropriate 
> folder in the Files area of the Support Web Site.
>
> EnergyPlus Documentation is searchable.  Open EPlusMainMenu.idf and press 
> the "search" button.
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
> 




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