[TRNSYS-users] Closed Cycle Solar Hot Water System

[David BRADLEY]

Joshua,
   Pumps typically set the flow rate for a loop based on their rated 
flow rate and the value of the input control signal. There are some pump 
models that will allow you to set the control signal to a value greater 
than 1 and therefore to exceed the pump's rated flow rate. I would 
recommend that you break your flow loop by removing one of the 
connections (the one that returns to the pump would be best). Then use 
an online plotter to look at the temperature and flow rate coming out of 
each component in the loop. Verify that you do not have any incorrect 
connections. Once you are convinced that there are no connection 
problems, reconnect the loop but disconnect whatever is connected to 
your pump's control signal. Force the control signal to be a known value 
either by setting a constant input value or by setting an equation. I 
think these tests will probably lead you to the problem.
Kind regards,
  David


On 9/27/2013 09:47, Joshua Chia wrote:
> Hi
>
> I'm trying to design a closed cycle hot water system for use with a 
> Heat Exchanger with a Solar Collector, pump and tank. I want to be 
> able to set the mass flow rate of the system but it seems that even 
> though I've set the maximum flow rate in the pump, the actual flow 
> rate is way higher than that. I'm guessing it is due to the tank. Can 
> anyone help me out on what to do with the tank? I only want a simple 
> tank with 1 inlet and 1 outlet and the mass flow rate to be the one i 
> determine it to be.
>
> Many Thanks
>
> -- 
> Regards
> Joshua
>
>
> _______________________________________________
> TRNSYS-users mailing list
> TRNSYS-users at cae.wisc.edu
> https://mailman.cae.wisc.edu/listinfo/trnsys-users

-- 
***************************
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

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/trnsys-users-onebuilding.org/attachments/20130927/7d59f65c/attachment-0001.htm>