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

["Kwang Ho Lee" <kwhlee@xxxxxxxxxxxx>]

 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.

 Regards,

 Kwang


> 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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