[TRNSYS-users] pool temp of outdoor pool Type 344

[Nidal Abdalla]

Dear David 
Thank you for your quick reply. I doubt that type 56 will be used with outdoor pool, I think that type 56 should be only used with indoor pool , please advise if i am wrong. I took your notes below into consideration, but the problem was not solved. However, I attached the tpf for your kind review.
Best regards
Nidal Abdalla 

 

________________________________
 From: David BRADLEY <d.bradley at tess-inc.com>
To: Nidal Abdalla <nidalabdalla at yahoo.com> 
Cc: TRNSYS-users <TRNSYS-users at cae.wisc.edu> 
Sent: Monday, July 16, 2012 6:16 PM
Subject: Re: [TRNSYS-users] pool temp of outdoor pool Type 344
  

Nidal,
  I have been using Type344 quite a lot lately and have not had
    trouble with it. I can think of a number of possible causes for the
    behavior that you describe but without seeing the project it is not
    possible to know which one is the trouble. I think the critical
    thing to do is to use a Type65 to look at the values of inputs 15
    and 16 to the pool (of course you will have to look at the outputs
    of whatever Type is connected to those inputs; a pump perhaps or the
    outlet of the solar collector). When you know what the inlet
    temperature and mass flow rate of heating water to the pool are, it
    should be obvious whether such a volume at such a temperature is
    able to change the pool's temperature.

1. it could be that you have so few collectors in comparison to the
    size of the pool that the collector system can't affect the pool.
2. if could be that the controller that determines when the
    collector system needs to run is not working the way that you expect
    it to.
3. it could be that the evaporative, convective, and radiative
    thermal losses from the pool are large in comparison to the energy
    input from the heating system and that the pool is completely
    dominated by its surroundings and not by the system.

Another thing to try is to disconnect the solar collector system and
    put in an imaginary source of hot water (just set the inlet
    temperature to a constant value and turn an arbitrary mass flow rate
    on and off with a controller. Verify that the pool temperature is
    affected by those inputs.

Kind regards,
 David



On 7/15/2012 01:42, Nidal Abdalla wrote:
 
Dear All  
>I am wondering if type 344 related with outdoor swimming pool have been updated or not. In fact, I tried to heat the pool using solar system by connecting the solar collector via input number 15 and 16, but I found that the temperature of the pool wasn’t raised regardless of the collector area. Do you any suggestions in this regards?  
>Best Regards 
>Nidal Abdalla  
> 
>
>_______________________________________________
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 
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