[esp-r] Re: Solar collector plant components

[Marco Manzan]

In data mercoledì 12 giugno 2013 17:12:43, Jon Hand ha scritto:
> An question about an explicit representation of an evacuated tube solar
> collector....
> 
dear  Christopher

It depends at which level the simulation has to be performed. If you are 
performing a plant simulation with solar collector you can try inserting the 
values of efficiency curve of your collector to the flat panel model along with 
the IAM modifier, the main problem in the model is the lack of transverse IAM, 
pheraps an upgrade of the model in order to take into account also this 
parameter will be very helpful. On the other hand f the simulation is aimed at 
obtaining the performance data of the collector I think ESP-r is not the 
correct tool. 

Marco   

> I can imagine a virtual experiment where there was a thermal zone in the
> shape of an evacuated tube however ESP-r would have no way of representing
> an mirror reflections within the collector zone so that radiation was
> directed to an absorber.  Another issue would be a zone with a vacuum.
> ESP-r might allow alternative to air filling with liquids but a vacuum is
> not something that has been tried.  It might be represented as very low
> surface convection on the inner surfaces.
> 
> Although there is a slab heater plant component (fluid running in pipes in a
> slab) I do not know anyone who has attempted to have the fluid running in a
> tube shaped pipe in an evacuated tube shaped zone.  Might work, and this
> would be rather at the extreme and require considerable attention to
> detail.
> 
> Perhaps someone in the community can think outside-the-box and come up
> with an approach?
> 
> Regards, Jon Hand
> ________________________________________
> From: esp-r-bounces at lists.strath.ac.uk [esp-r-bounces at lists.strath.ac.uk] On
> Behalf Of Christopher Heard [cheard at prodigy.net.mx] Sent: 06 June 2013
> 21:22
> To: esp-r at lists.strath.ac.uk
> Subject: [esp-r]  Solar collector plant components
> 
> I saw that back in December 2009 Andre Keul asked about modelling evacuated
> tube solar collectors by putting suitable values into a flate plate
> collector plant component.
> 
> I can't find a reply to the question.
> 
> Is there a workaround that enables a reasonable simulation of a evacuated
> tube solar collector?
> 
> A water filled building space with double glazing with a vacuum between the
> panes?
> 
> "- Building-side features can now be used to explicitly model systems.  This
> is achieved by allowing zones to be filled with fluids other than air (this
> affects solar absorption) and connected to flow networks established to
> represent any fluid type.  This enables, for example, the explicit
> modelling of water solar collectors and water-cooled windows."
> [esp-r Digest, Vol 59, Issue 22]
> 
> 
> Christopher Heard
> 
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|Marco Manzan               Email: manzan at units.it    |        
|Tel:   (+39) 040 5583506   Fax  : (+39) 040  572033  |        
|Dipartimento di Ingegneria e Architettura            |       
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