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Re: [EnergyPlus_Support] IdealLoads and Thermostats



1) You have the heating and cooling set points reversed.
2) If the space is allowed to float (i.e., no thermostat), there will 
not be any heating or cooling.
3) Now you know what happens when the conditions float, so add a 
thermostat to see what the loads are when the conditions are controlled..

a10alw wrote:
>
> Does the ZoneHVAC:IdealLoadsAirSystem object always require a
> thermostat? I'm trying to model a condition where an atrium space -
> which is surrounded by offices - is used as a return air plenum for
> the office spaces.
>
> To keep things simple, I've used the IdealLoads object and set my
> Heating Supply Air Temp to 24 deg C and my Cooling Supply Air Temp to
> 20 deg C. I haven't included a thermostat in order to see what
> happens if conditions in the highly glazed atrium are allowed to float.
>
> However, when I do this, the 'System Node Temp' results for the Zone
> Supply Air Node' to the atrium are not 24 and 20. They actually look
> like they're the same as the Return Air Node for that zone.
>
> Any thoughts? Do you always need a thermostat with IdealLoads? If
> so, should I just model this with a simple AirDistributionUnit?
>
> Thanks!
>
> 

-- 
Richard A. Raustad
Senior Research Engineer
Florida Solar Energy Center
University of Central Florida
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