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Re: [EnergyPlus_Support] Re: Earth tube connected to VAV system with supplies and returns in different zones

 Hi Chirs,

 If you apply both earth tube and HVAC models in a zone, the earth tube
model has the higher priority just like ZoneInfiltration and
ZoneVentilation models. EPlus first calculates the reduction (or even
increase in some cases) of the cooling/heating loads of the zone caused
by earth tube. And then the HVAC tries to meet the remaining
cooling/heating loads.

 As for the interzonal air flow, I am not familiar with the AirFlowNetwork
object, so maybe others can give you the answer regarding that object.
Sorry about that!

 Let me know if you have any other questions.



> Hi Kwang,
> I'm trying to access the features of the Earth tube model in compact hvac.
> The earth tube model appears to be quite simple in terms of ventilation.
> However, what happens when it is connected to a more complex system?
> That is what I'm attempting.
> The other point relates to interzonal air flow induced by compact HVAC. My
> current approach is: use an appropriate hvac template, run E+, open the
> expidf and apply set point managers to set mass flow to zero on the
> appropriate nodes shutting off supply/ extract in the respective rooms. In
> this way, I hope to model supply in one room with extract in another. I
> think I need to do a couple of things in AirflowNetwork that I haven't
> worked out yet.
> Chris
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Kwang Ho Lee" <kwhlee@...>
> wrote:
>>  Dear Chris,
>>  I don't fully understand what you want to do.
>>  You want to substitute the VAV system for Earth Tube or you want to
>> connect those two?
>>  Earth Tube model in EPlus acts almost the same as the ZoneInfiltration
>> or
>> ZoneVentilation model. It gets the outside air and introduces to the
>> room. However, the difference between earth tube model and the other two
>> is that the air is heated or cooled by the surrounding soil before
>> entering the room. You don't need to specify the nodes typically
>> required
>> in HVAC modeling in EPlus.
>>  Can you please spell out more of what you want to model?
>>  Regards,
>>  Kwang
>> > Hi
>> >
>> > I'm just writing in to see if the above system can be modelled in
>> > principle before I delve in to the reams of E+ documentation - heaven
>> help
>> > me! It would also help me work out if I can tell my client "yes" or
>> "no it
>> > can't be done!".
>> >
>> > First, could I substitute the VAV system Outdoor air node for the zone
>> > used by the ZoneEarthTube?
>> >
>> > Second, utilising the relevant AirflowNetwork objects, could I edit
>> the
>> > return air nodes/ return mixer to alow for Air to be supplied in one
>> (or
>> > more) rooms and extracted from one (or more) alternate rooms.
>> >
>> > Many thanks
>> >
>> > Chris
>> >
>> >


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