Re: [EnergyPlus_Support] Circulation-only Fans: Zone Equipment?

[JRR <energy.wwind@xxxxxxx>]

John wrote;

This is much more complicated than meets the eye.
Real world green houses often have a tremendous amount of condensation on
the glazing in the mornings and water has a very high heat of vaporization
( 540..... etc. you know ) So if the GH is kept warm enough to give a 
reasonable
limit to  O-night condensation your model will be pretty good.  
Otherwise you
need to model an electric circuit equivalent with a large perfect 
current generator
at the wall....... and account for free water surface at a standing temp..
bye

Kristin Field wrote:

>Hi, I'm trying to model a set of greenhouses that are heated only with
>fin tube radiators.  The only "cooling" is through natural ventilation
>and intake fans, which I have modeled using AirFlow objects.  I don't
>have a question about this part of the model, just providing this
>info. as background.
>
>The question I have is about modeling the circulation fans that run
>continuously in the greenhouse.  I thought of doing them as zone
>equipment, but the I/O Reference lists the types of zone equipment
>allowed, and plain "fans" are not among them.  Another option I
>considered is modeling them as unit heaters with the heating cool
>never enabled, but I was hoping for an easier solution.  The cfm is
>high and, I would think, will have a big effect of the convection part
>of the heat balance.  Without the effect on convection, I would
>otherwise just input the fan heat as an electric internal gain.
>
>Any thoughts?
>
>Thanks,
>Kristin Field
>
>
>  
>



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