Re: [EnergyPlus_Support] Engineering Reference doubt

[Fred Buhl <wfbuhl@xxxxxxx>]

David Barrera wrote:
> Dear all: 
> I’ve had doubts reading the Engineering Reference
> document:
>
> What is it referred to when it’s said
> building-system-plant.  I understand building,
> literally is the edification I’m working with; system,
> I think is a system which provides energy in some way
> to a zone (a ventilation system, for example) and
> plant, what “plant” refers to? 
>   
Sometimes the terminology is not very precise. Building generally refers 
to the
building envelope; system in this case refers to the secondary HVAC 
system supplying
conditioned air to the zone - in the US this is usually a forced air 
system with ducts,
heating & cooling coils fans etc; plant in this case means "central" 
plant - the chilled,
hot, and condenser water circuits along with boiler(s), chiller(s), 
cooling tower etc.

Fred Buhl
> There is an summary of  the predictor-corrector
> procedure. In the first point it’s said : 
>
> - Using equation (3), an estimate is made of the
> system energy required to balance the
> equation with the zone temperature equal to the
> setpoint temperature.
>
> To balance which equation? The same equation (3)?
>   
Yes
> - With that quantity as a demand, the system is
> simulated to determine its actual
> supply capability at the time of the simulation. This
> will include a plant simulation if
> necessary.
>
> The problem here is my confusion of what a plant
> refers to. 
>   
See above
> Thanks a lot. 
>
>
>
>  
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