Re: [EnergyPlus_Support] Thermal Chimney modelling method

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

 Dear Aymeric,

 Yes, you need to use Zone:ThermalChimney object to simulate what you want
to model. Just simply adding a zone adjacent to the office without using
Zone:ThermalChimney object won't induce the natural ventilation that you
would expect unless you separately use AirflowNetwork objects.

 What Zone:ThermalChimney does is to compute the amount of heat that is
aborbed into the thermal chimney air after taking into account all the
detailed heat balances taking place inside the thermal chimney zone. And
then it calculates the outlet discharge air temperature through the upper
opening and the enhanced natural ventilation caused by the thermal
gradient within the thermal chimney.

 You can also refer to the recently published paper entitled "Enhancement
of natural ventilation in buildings using a thermal chimney". It is on
the thermal chimney model of EnergyPlus.

 Regards,

 Kwang


> Dear all,
>
> I am struggeling to know whether or not I did simulate properly a solar
> chimney. It is in Jerusalem climate.
> I first modelled a zone adjacent to the office I want to cool down. I
> positionned a low opening on the partition wall separating the two zones.
> This wall is of course composed by a structural part, here concrete, 2.5cm
> polyurethan board insulation and a black selective metal plate. The outer
> wall of the chimney is a glazed wall with an upper opening.
>
> Although it seems to work logically, it doesn't match experimental
> results. Basically it seems it doesn't enhance enough the natural
> ventilation...
>
> Using this method, I certainly don't take into account the temperature
> gradient within the thermal chimney, right? Is it more reliable to use the
> object Zone:ThermalChimney?
>
> Plus, an additional problem I can't explain is that I get some massflow
> through ceilings although I do not activate infiltration calculations...
>
> If anyone has experience modelling thermal chimney, I would be happy to
> know more about that!
>
> Thanks a million
> Aymeric
>
>




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