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Re: [TRNSYS-users] Type73 - Flat-Plate Collector



Dear Igor,

First of all, please make sure that your timestep is small - probably under 0.125 hour. Type Type2b collector is recommended for a simulation like this. Honestly, there are few simulations where one should use Powell's method such as a PV connected to a pump. If you continue to have problems, please feel free to send to your local TRNSYS distributor or me.

Best regards,

Matt Duffy


----- Original Message -----
From: "Igor Grujic" <igor.g@gmx.at>
Sent: Tue, September 20, 2011 3:33
Subject: [TRNSYS-users] Type73 - Flat-Plate Collector

Dear TRNSYS-Users,

I’m using the Type73 as Flat-Plate Collector in combination with Type 2a
(Powell-Method-Controller). The Controller should turn on the pump, when the
Collector Outlet temperature exceeds the 80°C.-limit. (Actually I used I equation
instead of pump, but it has the same function).
The problem I have is that the Collector Inlet and Outlet flowrate diverge from each
other. At some time step it’s greater than the inlet, and sometimes it’s smaller
and so on…

The Flowrate is coming from Type 997 to the equation and goes to the Collector when
the Controller turns it on. That means the Collector inlet has every time a
different flowrate and temperature.
Are there maybe some restrictions for the Flat-Plate-Collector (Type 73) so that it
can’t handle the changing inlet??

(I also tried the Type 2b (Successive-Substitution-Controller) but that didn’t
helped, in fact it turns the pump on even when the Collector Outlet-Temperature is
under the 80°C-limit).

Thanks in advance

Best regards,
Igor

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