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[EnergyPlus_Support] Re: Ventilation sistem without return air
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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