[esp-r] Re: Control of air volume

[wakana-m at ec.hokudai.ac.jp]

Dear Jon and everyone,

 Thank you for your prompt response.
 Now I use constant mass flow component in air flow network.
 And I also use ON/OFF control of air flow and input the fraction of 
capacity in air flow control.
 However the air volume value of results isn't changed.
 
 For example, If I input that constant mass flow is 0.5 kg/s component 
and use ON/OFF control (fraction of capacity is 0), the flow keeps 0.5kg
/s, not changed.
 In this case, I think that the mass will be half when the flow is ON.

 Would it impossible to use both of constant mass flow component and 
fraction of capacity in ON/OFF control?

 Best regards,

 Wakana Matsumoto

----- Original Message -----
> 
> You can apply control to a volume flow component or a mass flow
> component.  This is especially useful in early design assessments
> where a volume flow component is being used to represent a
> future detailed fan component.  There are a number of examples
> of controlling volume flow rates in the training folders.  This is
> also discussed in the ESP-r Cookbook (recently updated in the
> ESRU web site).
> 
> -Jon Hand
> ________________________________________
> From: esp-r-bounces at lists.strath.ac.uk [esp-r-bounces at lists.strath.ac.
uk] On Behalf Of wakana-m at ec.hokudai.ac.jp [wakana-m at ec.hokudai.ac.jp]
> Sent: 29 October 2012 23:24
> To: esp-r at lists.strath.ac.uk
> Subject: [esp-r] Re: Control of air volume
> 
> Dear Achim and everyone,
> 
>  Thank you for your response.
> 
>  As you said, I'm using an air flow network and an air flow network
> control.
>  I chose on/off control method in my model.
>  In on/off control, we should input a setpoint, action and fraction.
>  I think fraction means effective opening areas.
>  Is it possible to control air flow based on air volume instead of
> effective opening areas?
> 
>  Best regards,
> 
>  Wakana Matsumoto
> 
> ----- Original Message -----
> > Dear Wakana Matsumoto
> >
> > could you please elaborate on what you mean with "air flow module"?
> Did you add a flow network? If yes, and if the ventilation is to be "
> natural", then you will likely want to control an opening? E.g. open 
or
> close a window? There are several possible approaches to this. If you
> really do want to have "hourly" changes (when using an air flow 
network,
> time steps of an hour may lead to problems), the best approach may be
> using a TDF file. The alternative is to set up a standard "air flow
> network control" via ProjectManager. This is a very similar procedure 
to
> setting up (thermal) zone control.
> >
> > Best
> > Achim
> >
> >
> > On Oct 22, 2012, at 9:02 AM, wakana-m at ec.hokudai.ac.jp wrote:
> >
> > > Dear all,
> > >
> > > Hello.
> > > I'm using ESP-r system now.
> > > The air flow module for natural ventilation is included in my 
model .
> > > Now I would like to change the fluid flow volume on an hourly 
basis.
> > > So, when the air moves from a node to another node can I control 
its
> > > flow volume ?
> > >
> > > Best regards,
> > >
> > > Wakana Matsumoto
> > >
> > >
> > >
> > >
> > > _______________________________________________
> > > esp-r mailing list
> > > esp-r at lists.strath.ac.uk
> > > http://lists.strath.ac.uk/mailman/listinfo/esp-r
> > >
> >
> > achim.geissler at intergga.ch
> >
> >
> >
> >
> >
> > _______________________________________________
> > esp-r mailing list
> > esp-r at lists.strath.ac.uk
> > http://lists.strath.ac.uk/mailman/listinfo/esp-r
> >
> 
> 
> 
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