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[EnergyPlus_Support] Re: Fan On/Off depends on another zone temperature

Vinay and I recently proposed different solutions to a user who was also trying to move air from one zone to the other based on dT. 'ZoneVentilation:DesignFlowRate' does take its air from outdoors therefore I favour the ZoneMixing object. The only catch with my solution is that fan energy is not in the equation. Though to post process the flow results to obtain a energy consumption for the fan is simple. It is just a function of flow and fan pressure. If you are familiar with EMS you could even program a routine to calculate it dynamically. I think the fan energy will be very small, but the additional gains from moving the air around may also be.

There is another concept where the energy is transported via water (Water-side econimizer). A hot server room may be equiped with a fan and coil arrangement, the energy transfers from the hot zone air into the water in the coil (assisted by the fan blowing the hot room air over it). A pump then pumps this warmer water to another zone that requires heat or to the outdoors where a similar fan and coil arrangment is. The server room is fed with the cooled water. Free cooling, except for fan and pump energies.

I like the air transport version in some situations and the water variation in others.

Let us know how you get on.

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "energy.partners" <energy.partners@...> wrote:
>
> Hi Vinay,
> 
> Thanks for your reply.
> I can't find 'Zoneventilation:DesignAirFlow'. Do you mean 'ZoneVentilation:DesignFlowRate'?
> The I/O reference says the DesignFlowRate is for ventilation of air from outdoor environment into thermal zone. So is it possible to set the outdoor as a zone?
> 
> I have tried using the 'AvailabilityManager:DifferentialThermostat' but still having problems with the simulation. I have post this question in another post "Modelling under-slab subfloor void - fan control"
> 
> Regards.
> 
> 
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Vinay Devanathan <vinay.devanathan@> wrote:
> >
> > You can model this by using *ZoneVentilation:DesignAirFlow* object also. It
> > can work based on the temperature in your room B, but you will not
> > necessarily have a fan component in Room A, it just simulates it like a fan
> > drawing air or supplying air or doing both. The I/O reference describes the
> > object well.
> > 
> > Vinay
> > 
> > On Wed, May 30, 2012 at 11:12 PM, energy.partners <energy.partners@
> > > wrote:
> > 
> > > **
> > >
> > >
> > > Hi,
> > >
> > > Is it possible to set the Fan on/off of a zone which depends on the
> > > temperature of another zone?
> > >
> > > I would like to set up a fan in room A which draw air from room B only
> > > when room B has a higher room temperature. Do anyone know how to setup the
> > > setpoint manager to set up the above situation?
> > >
> > > Many thanks.
> > >
> > >
> > >  
> > >
> > 
> > 
> > 
> > -- 
> > Vinay Dev
> >
>




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