Re: [EnergyPlus_Support] Reheat schedule / Chiller Capacity

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

You need them both.  The system availability manager controls an 
entire air primary loop.  It is a master schedule for all components 
on the loop.  For a given component to be available, both the 
availability manager and the individual component schedule must be 
on.  

Mike

p.s.  I have not had time to look into your other question, probably 
next week.  

On 17 Sep 2003, at 19:12, Helen Xing wrote:

> Hello, there.  Regarding VAVSingleDuctReheat.idf that comes with the
> E+ package, I have a question about the reheat system schedule.  In
> the .idf file, the reheat system and reheat coils have the same
> schedules, but are described separately as COIL:Water:SimpleHeating
> and SYSTEM AVAILABILITY MANAGER, shown below.  If these two always
> have the same schedules (they should?), can we just define one, and
> get rid of the system availability manager?  How does this system
> availability manager list play a role in the Air Primary Loop?  Thanks
> a lot.  - Helen
> 
>    COIL:Water:SimpleHeating,
>      Reheat Coil Zone 1,  !- Coil Name
>      FanAndCoilAvailSched,  !- Available Schedule
> 
>    SYSTEM AVAILABILITY MANAGER:SCHEDULED,
>      Reheat System 1 Avail,  !- Name
>      FanAndCoilAvailSched;  !- Schedule name
> 
> 
> 
> 
> I am sending one of my questions again here, as I didn't see it in
> group emails after sent yesterday.  Apologies if you received this
> twice.  Thanks again for your help.
> 
> I uploaded two files at the E+ Yahoo group 
> Files\Problem_Submittals\hxing.  Could you please take a look and
> offer some suggestions?  Simulation runs with LA weather data.
> 
> One question is about the impact of chiller capacity.  I varied the
> chiller capacity alone (Little Chiller nominal capacity) in the E+
> input file and kept an eye on the chiller electricity consumption and
> the cooling demand.  Some parametric study results can be found in the
> spreadsheet file.  The cooling load is about 15kW at its peak, and
> those electricity consumptions look Ok except for at 10kW where I am
> not sure as chiller has no enough capacity.  The plant loop cooling
> demand was expected to be similar for all capacity levels, but
> something happened to early AMs for 30, 50 and 70kW.  Wondered how to
> explain these sudden changes, and also the entire days of 70kW and
> 100kW being very different from other cases.
> 
> Also, the similar abrupt changes happened to heating as well at early
> AMs.  I understand that lowering the early AM thermostats would help
> reduce/avoid heating, but hot water at 8am seems to have problems. 
> Besides, what else can we do to avoid heating and cooling at the same
> time in this system?
> 
> 
> [Non-text portions of this message have been removed]
> 
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========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx


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