Re: [EnergyPlus_Support] Re: Setpoint not met during night cycle

[Fred Buhl <wfbuhl@xxxxxxx>]

It is supposed to run work that way, though as you point out that
it may not make the most sense.. Thanks for solving your own problrm!

Fred

JV Dirkes II wrote:
> Dear E+ Forum,
>
> After experimenting some more, it appears that the SYSTEM AVAILABILITY
> MANAGER:NIGHT CYCLE "Cycling run time" was preventing the zone from
> reaching the setpoint.  When I set it for 900s (15 min), it would turn
> the system OFF at the end of that period, even though the setpoint was
> not met. In other words, it came ON for 900s, turned OFF for 900S,
> then ON for 900s , etc.
>
> When I set the "Cycling run time" for 3600s, it operates on a longer
> cycle, which allows the zone to warm properly.  Of course the fan runs
> a lot more, too!
>
> I guess I've solved my own problem for now, but still have a question:
>
> 1) Is the SYSTEM AVAILABILITY MANAGER:NIGHT CYCLE supposed to work
> this way?  It seems to me that a control system should operate in
> NIGHT CYCLE as long as needed to achieve the setpoint, and then shut
> off.  My first understanding of the "Cycling run time" was as a
> MINIMUM run time.  That's apparently incorrect, but it seems to be
> more appropriate....
>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "JV Dirkes II" <jvd2pe@...>
> wrote:
>   
>> Dear EPlus Forum,
>>
>> Please help me determine why my model maintains proper setpoints
>> during Winter Design Days in the "night" period, but fails to do so on
>> other winter days.
>>
>> During the night, the setpoints are as expected, the system cycles on
>> and off as expected (I'm using a SYSTEM AVAILABILITY MANAGER:NIGHT
>> CYCLE), but the zone temp is much lower than the setpoint (including
>> the thermostat on/off tolerance).
>>
>> I'll upload the file....
>>
>>     
>
>
>
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>   


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