[TRNSYS-users] Type1 Number of identical collectors in series has no effect
David BRADLEY via TRNSYS-users
trnsys-users at lists.onebuilding.org
Thu Oct 20 12:43:18 PDT 2016
Antoine,
That is correct so long as "A" is the area of the full array (12 times
the area of a single module) and so long as "M" is twice the flow rate
that you want to go through each collector. Mathematically:
M = X * Ntotal / Nseries
where M is the pump flow rate, X is the flow rate per collector, Ntotal
is the total number of collectors (12), and Nseries is the number of
collectors in series per parallel path (6).
best,
David
On 10/20/2016 14:20, Antoine Gautier wrote:
>
> Sorry David I still have some doubts…
>
> Here is a schematic.
>
> Within each row, the collectors are connected in series.
>
> The pump flowrate is M. The total array area is A.
>
> I can model this with Type1 considering:
>
> Number in series=6
>
> Collector area=A
>
> Inlet flowrate=M
>
> Is this correct?
>
> Thanks again.
>
> --
>
> Antoine Gautier
>
> Solamen
>
> +33 6 58 24 02 60
>
> antoine.gautier at solamen.fr
>
> *De :*David BRADLEY [mailto:d.bradley at tess-inc.com]
> *Envoyé :* jeudi 20 octobre 2016 20:44
> *À :* Antoine Gautier <antoine.gautier at solamen.fr>; 'TRNSYS users
> mailing list at OneBuilding.org' <trnsys-users at lists.onebuilding.org>
> *Objet :* Re: [TRNSYS-users] Type1 Number of identical collectors in
> series has no effect
>
> Antoine,
>
> I'm not 100% sure that I follow your logic but you can model that
> array with a single instance of Type1. If your single module has an
> area of 1m2 and wants a flow rate of 400kg/h then the full array of 50
> modules (10 in parallel, 5 in series) would have:
>
> area = 50 m2
>
> number in series = 5
>
> flow rate = 4000kg/h (400kg/h x 10 in parallel)
>
> best,
>
> David
>
> On 10/20/2016 13:30, Antoine Gautier wrote:
>
> Thanks David
>
> Just to be sure…
>
> Considering an array of 50 collectors = 10 parallel-connected rows
> of 5 series-connected collectors, total inlet flowrate of array =
> M, total area = A.
>
> I cannot model the whole array with Type1 only: I need to add an
> equation multiplying the flowrate and energy rate computed by
> Type1 by the number of rows. Type1 parameters and inputs being the
> following:
>
> Number in series=5
>
> Collector area=A/10
>
> Inlet flowrate=M/10
>
> Right?
>
> --
>
> Antoine Gautier
>
> Solamen
>
> +33 6 58 24 02 60
>
> antoine.gautier at solamen.fr <mailto:antoine.gautier at solamen.fr>
>
> *De :*David BRADLEY [mailto:d.bradley at tess-inc.com]
> *Envoyé :* jeudi 20 octobre 2016 19:24
> *À :* Antoine Gautier <antoine.gautier at solamen.fr>
> <mailto:antoine.gautier at solamen.fr>; TRNSYS users mailing list at
> OneBuilding.org <trnsys-users at lists.onebuilding.org>
> <mailto:trnsys-users at lists.onebuilding.org>
> *Objet :* Re: [TRNSYS-users] Type1 Number of identical collectors
> in series has no effect
>
> Antoine,
>
> This is a common source of confusion. Two points are important
> to keep in mind. First, the collector array area parameter is the
> area of the entire array, not just the area of one module in the
> array. Second, if you add a second collector you have to be
> careful about what you do with the flow rate. If you are adding a
> second collector in parallel to the first one you should double
> the collector array area, leave the "number in series" parameter
> set to 1, and double the liquid flow rate to the array. If you are
> adding a second collector in series with the first one, you should
> double the collector array area, set the number in series to 2,
> and leave the liquid flow rate unchanged.
>
> kind regards,
>
> David
>
> On 10/20/2016 11:46, Antoine Gautier via TRNSYS-users wrote:
>
> Hi
>
> I cannot figure out why the number of collectors in series has
> no effect on the collectors array efficiency: see attached
> project.
>
> Computing equations from source code manually I would state
> the opposite…
>
> Thanks for your help.
>
> Best regards
>
> --
>
> Antoine Gautier
>
> Solamen
>
> +33 6 58 24 02 60
>
> antoine.gautier at solamen.fr <mailto:antoine.gautier at solamen.fr>
>
>
>
>
>
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>
>
>
> --
>
> ***************************
>
> David BRADLEY
>
> Principal
>
> Thermal Energy Systems Specialists, LLC
>
> 22 North Carroll Street - suite 370
>
> Madison, WI 53703 USA
>
>
>
> P:+1.608.274.2577
>
> F:+1.608.278.1475
>
> d.bradley at tess-inc.com <mailto:d.bradley at tess-inc.com>
>
>
>
> http://www.tess-inc.com
>
> http://www.trnsys.com
>
>
>
> --
> ***************************
> David BRADLEY
> Principal
> Thermal Energy Systems Specialists, LLC
> 22 North Carroll Street - suite 370
> Madison, WI 53703 USA
> P:+1.608.274.2577
> F:+1.608.278.1475
> d.bradley at tess-inc.com <mailto:d.bradley at tess-inc.com>
> http://www.tess-inc.com
> http://www.trnsys.com
--
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI 53703 USA
P:+1.608.274.2577
F:+1.608.278.1475
d.bradley at tess-inc.com
http://www.tess-inc.com
http://www.trnsys.com
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