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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:
-- *************************** 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@tess-inc.com http://www.tess-inc.com http://www.trnsys.com |