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[EnergyPlus_Support] Re: Ventilation sistem without return air
Thank you, Elemer,
Finally I found some time and run the model sucessfuly.
I develpoed model with variable speed fan.
I saw that EP model for heat rotary recovery unit does not use the
size of the exchanger.
I will make some optimization and find how heating coil influence
the efficiency of the recovery unit.
Thank you again.
Best wishes
Natasa
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Elmer Morrissey"
<elmofuddly@...> wrote:
>
> Hi Natasa,
>
> Re Q1? You can see that you do not list the HEAT EXCHANGER:AIR TO
> AIR:GENERIC in any branch list. You use the AIR LOOP EQUIPMENT
LIST
> (see below).
>
> Re Q2? you list that fan on the branch list in the right order
(see
> below).
>
> Lets say you have an air handling unit called AHU1 which only has
a
> supply fan, extract fan and a heat recovery wheel. Then your input
> would look like this?
>
>
> BRANCH,
> AHU1 Air Loop Main Branch,
> 0.141,
> FAN:SIMPLE:ConstVolume,
> AHU1 Exhaust Fan,
> AHU1 Extract Air Inlet Node,
> AHU1 Extract Fan Outlet Node,
> ACTIVE,
> OUTSIDE AIR SYSTEM,
> AHU1 OA System,
> AHU1 Extract Fan Outlet Node,
> AHU1 Supply Fan Inlet Node,
> PASSIVE,
> FAN:SIMPLE:ConstVolume,
> AHU1 Supply Fan,
> AHU1 Supply Fan Inlet Node,
> AHU1 Supply Fan Outlet Node,
> ACTIVE;
>
> AIR PRIMARY LOOP,
> AHU1 Air Loop,
> ,
> AHU1 System Avail List,
> 0.141,
> AHU1 Air Loop Branches,
> ,
> AHU1 Extract Air Inlet Node,
> AHU1 Zone Equip Outlet Node,
> AHU1 Zone Equip Inlet Node,
> AHU1 Supply Fan Outlet Node;
>
>
> CONTROLLER LIST,
> AHU1 OA Sys Controllers,
> CONTROLLER:OUTSIDE AIR,
> AHU1 OA Controller;
>
>
> AIR LOOP EQUIPMENT LIST,
> AHU1 OA Equip List,
> HEAT EXCHANGER:AIR TO AIR:GENERIC,
> AHU1 Thermal Wheel,
> OUTSIDE AIR MIXER,
> AHU1 OA Mixing Box;
>
>
> OUTSIDE AIR SYSTEM,
> AHU1 OA System,
> AHU1 OA Sys Controllers,
> AHU1 OA Equip List,
> AHU1 System Avail List;
>
>
> OUTSIDE AIR INLET NODE LIST,
> AHU1 Outside Air Inlet Nodes;
>
>
> OUTSIDE AIR MIXER,
> AHU1 OA Mixing Box,
> AHU1 Supply Fan Inlet Node,
> AHU1 MB OA Inlet Node,
> AHU1 MB Relief Air Outlet Node,
> AHU1 Extract Fan Outlet Node;
>
> You'll need to pretend that the system is a recirc system with
> outside air - ie a normal VAV system. You will need to set the
> minimum OA to the total flow rate. The heat recovery unit will be
in
> the OA system. Probably need to set MinimumLimit to Proportional
> Minimum in the controller:outside air.
>
> Read the documentation for `heat exchanger:air to air' to point
you
> in the right direction to see what you should assign to the
> setpoints you see below
>
>
> CONTROLLER:OUTSIDE AIR,
> AHU1 OA Controller,
> BYPASS,
> NO RETURN AIR TEMP LIMIT,
> NO RETURN AIR ENTHALPY LIMIT,
> NO LOCKOUT,
> PROPORTIONAL MINIMUM,
> AHU1 Supply Fan Inlet Node,
> AHU1 OA Inlet Node,
> 0.141,
> 0.141,
> 28,
> 16,
> 0,
> AHU1 MB Relief Air Outlet Node,
> AHU1 Extract Fan Outlet Node;
>
> HEAT EXCHANGER:AIR TO AIR:GENERIC,
> AHU1 Thermal Wheel,
> FanAndCoilAvailSched,
> 0.275,
> 0.86,
> 0,
> 0.81,
> 0.73,
> 0.76,
> 0.68,
> 0.81,
> 0.73,
> AHU1 OA Inlet Node,
> AHU1 MB OA Inlet Node,
> AHU1 MB Relief Air Outlet Node,
> AHU1 Exhaust Node,
> 370.0,
> Yes,
> Rotary,
> None;
>
> I hope this helps.
>
> Kind regards
>
> -Elmer
>
>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "natasamdj"
> <natasamdj@> wrote:
> >
> > Hi Elmer,
> > Before few days I asked you about Heat Recovery in EnergyPlus. I
> > understood what you said to me. But still I cannot run the
model.
> I
> > have some questions:
> > 1. Should HEAT EXCHANGER:AIR TO AIR:GENERIC be listed in the
Inlet
> > Air Branch and also in the Exhaust Air Branch? I think that it
> > should be, and i set it the the Branch list,but I have gotten in
> > error file the answer that it is "Invalid Component Type input".
> > 2. I understood you about that everything in E+ is some kind of
> > loop. But how I should deal with exhaust fan? I have supposed to
> > have two fans, one for Inlet Air and another one for Exhaust Air.
> >
> > Thank you in advance
> >
> > Best wishes
> >
> > Natasa M.Djuric
> > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Elmer Morrissey"
> > <elmofuddly@> wrote:
> > >
> > > Hi Natasa
> > >
> > > I ran into this problem a few weeks back... it's quite easy to
> fix.
> > > Everything in EnergyPlus is set up in loops. So all you have
to
> do
> > is
> > > set up your air loop to `look' like another typical loop.
> > >
> > > The loop will resemble a situation where the return air is fed
> > > straight into the supply fans etc. However, you attach an
> Outside
> > Air
> > > System to the beginning of this loop along with a rotary wheel
> > > (examples can be found bundled with E+). All you have to do
now
> is
> > > force the air to not mix by setting the minimum and maximum
> outside
> > > air intake in the Outside Air Controller to be the same level.
> If
> > you
> > > do this, you will get no mixing of the return and fresh air.
> > >
> > > Note: if you want to bypass the thermal wheel in certain
> > conditions,
> > > this is controlled from the OA controller too. It is well
> > documented
> > > in the input/output reference (something I missed at the
> time!!!!)
> > >
> > > Hope this helps.
> > >
> > > Kind regards
> > >
> > > -Elmer
> > >
> > >
> > > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "natasamdj"
> <natasamdj@>
> > > wrote:
> > > >
> > > > Dear,
> > > > I am trying to develop the model of ventilation with heat
> > recuperation
> > > > but without mixing with the return air. I am planning to
apply
> > the
> > > > rotating heat exchanger. My problem is because everywhere in
> > Energy
> > > > Plus for defining the air path, there are fields for return
> air.
> > The
> > > > exhaust air from the zone should be forced through rotating
> heat
> > > > exchanger. I do not want to have air mixing of outside air
and
> > exhaust
> > > > air. But everywhere in Energy Plus there are the fields for
> > return
> > > > air. I passed through some of examples from new version
1.2.3,
> > but I
> > > > could not find the example about that.
> > > >
> > > > Please can you give me some advice how to model the
> ventilation
> > > > without air mixing? I will continue to work on it, and maybe
I
> > will
> > > > have some more specific question in future.
> > > >
> > > > Thank you in advance
> > > >
> > > > Natasa M.Djuric
> > > >
> > >
> >
>
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