Re: [EnergyPlus_Support] some questions

["Michael J. Witte" <mjwitte@xxxxxxxx>]

1.  Run a file comparison on the idf and eio files to find out what was 
different between the two runs.  The presence of a weather file can override 
the location data for a design day run.  Perhaps this is what changed?

2.  There are no throttling ranges in EnergyPlus.  All controls attempt to meet 
the setpoint if possible.

3.  Typically, this is set to meet the minimum outside air requirements for the 
zones and to assure a minimum amount of cirulation in the space.  Consult an 
HVAC handbook for more guidance.  Values in the range of 0.2 to 0.3 are common.

4.  For examples of humidity control, see 5ZoneWaterCooled_HighRHControl.idf 
(chilled water system) or FurnaceWithDXSystemRHcontrol.idf (DX packaged system) 
in the ExampleFiles folder.

Mike


On 9 Nov 2004, at 10:30, beyangj wrote:

> 
> 
> Dear,
> I have some questions as follow:
> 
> Firstly, I run the simulation two times, but the results were 
> slightly different from each other. Why did this happen? There were 
> some warnings about SimAirLoops: Maximum iterations exceeded for VAV 
> SYS 1, but Mike just told me that the max iteration errors in this 
> case were caused by very small fluctuations in the supply 
> temperature, and this was not causing any error in the energy 
> consumption calculation, room temperature, comfort etc. In this 
> case, why were the results different? 
> 
> Secondly, Can I set the throttling-range Cooling control throttling 
> range? In my IDF file, I don¡¯t know where I can set the throttling-
> range Cooling control throttling range. If I don¡¯t set this value, 
> what¡¯s the default value? 
> 
> Thirdly, what are the reasonable values for the minimum system air 
> flow ratio and the zone minimum air flow fraction? 
> 
> In addition, the zone relative humidity could be controlled? I want 
> to control  the zone relative humidity as 50%, but the zone relative 
> humidity is about 60%~70%.
> 
> Thanks in advance!
> 
> Best,
> 
> Stewart
> 
> 
> 
> 
> 
> 
> 
> 
> 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.
> 
> Yahoo! Groups Links
> 
> 
> 
> 
> 
> 
> 
> 
> 



========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx




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