[esp-r] Re: [Fwd: schedule for the thermal mass

[Geissler Achim]

Jon,
a thought:
... are internal sinks (negative internal loads) possible? Then it may be possible to define the changes in mass (i.e. either sinks - lower temperature than the indoor air - or sources) via internal load schedules - which should pose no problem to the solver.
Achim
(P.S.: By the way, I tried compiling on an Intel Mac ... totally without success)


> -----Original Message-----
> From: esp-r-bounces at lists.strath.ac.uk [mailto:esp-r-
> bounces at lists.strath.ac.uk] On Behalf Of Jon Hand (clcv10)
> Sent: Tuesday, February 06, 2007 3:18 PM
> To: p_karava at alcor.concordia.ca
> Cc: esp-r at lists.strath.ac.uk
> Subject: [esp-r] Re: [Fwd: schedule for the thermal mass
> 
> 
> A recent question that we have never been asked before....
> 
> > I am developing a model for a storage room, which is filled with
> > cans of
> > milk; this adds a thermal mass which changes with time (people come
> > in to
> > add or remove cans). I was wondering if there is a way to have a
> > schedule
> > for the thermal mass in ESP-r.
> >
> 
> The short answer is probably but with some risk.
> 
> It is possible to define a control
> that substitutes one construction for another in up to 3 surfaces
> in a zone (the so-called nested control option).  This control
> is one of the least used and so there is very little experience
> in the community for its use, particularly in relation to surfaces
> inside a zone.
> 
> Energy balance tends to go off into another universe
> when altering mass (the bookkeeping for the storage in the
> mass never thought it would have to do such a thing).
> 
> Approaching this from a different viewpoint - it is possible to
> fix the heat transfer coefficient for specific surfaces based on
> a schedule.  Would a change in convection at the mass surfaces
> mimic a change in mass within the zone???
> 
> -Jon Hand
> 
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