Re: [EnergyPlus_Support] HVAC Components on/off, bypass status

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

Franz:

What type of system are you modeling?  Is this a single-zone air 
handler or does it serve multiple zones?  If it is a single-zone air 
handler, then use the furnace or unitary equipment to control heating 
and cooling to meet the zone's needs.  If it is a multi-zone air 
handler, then you can use setpoint managers to deactivate equipment 
based on the zone with the greatest needs (set point manager:warmest) 
or reset control temeperatures based on outdoor air temperature (set 
point manager:outside air).

Mike


On 11 Feb 2003, at 11:51, Franz Muller wrote:

> Dear E+ users,
> 
> I am trying to model HVAC consisting of a heater, humidifier, cooler,
> preheater and van. During the simulation all 5 elements are trying to
> reach the desired room conditions. That is sometimes not useful as
> they are working simultaneously and I get a huge energy consumption.
> During winter time I want to bypass the cooler and during summer time
> I want to bypass the preheater as I do not need them at this time. One
> possibilty is to define availability schedules for each element,
> turning off the heater in summer time for example. But I want to have
> them in operation by defining a temperature band, eg. the cooler
> should only be active at temperatures from 20 to 40 °C. I could define
> of course a schedule after running a simulation and looking at the
> temperatures there. But that is not that I want. Is it possible to
> make the components working by connecting them to a temperature
> sensor. Or the other way round can I generate a availabilty schedule
> for the components by a definition of IF THEN concerning temperatures.
> This is important for me if I change the location for example from
> Moscow to Sao Paulo as the weather files are quite different and it
> would take a lot of time to generate all the schedules for the new
> location.
> 
> I hope I could make my problem clear. 
> Thanks for your help in advance.
> 
> Franz
> 
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