Dear sir/madam: I am working with a simulation of a real facility in TRNSYS 15. This facility is a solar thermal system, linked to an auxiliary system. The auxiliary system is an indirect one, in this way you can find a water boiler, a heat exchanger and an auxiliary storage tank. The boiler must stop working when cold-side outlet temperature of heat exchanger reachs 55 ºC. So I have tried to use a controller (TYPE 2A), using as monitoring temperature the cold-side outlet temperature and setting 55 as high limit cut-out. The upper input temperature is linked to cold-side outlet temperature too, and the lower input temperature is always 0. In this way, the controller should always shows a 1 as output control, except when the temperature to be monitored goes over 55 ºC. However, this doesn´t run. I find convergence problems (error 203). And if I touch convergence tolerance in control card (increasing it) I find that strange things happen because the colector outlet temperature reachs values over 120 ºC. This does not happen without controller in auxiliary system. I have tried with Equation and the operator "less than" (lt) and I find the same problem. I send you the file, although I am afraid you will not be able to run it because I use a personal meteorological data file, but you can see the whole assembling. PLEASE, PLEASE, I WOULD APPRECIATE VERY MUCH IF YOU COULD SUGGEST SOMETHING NEW I COULD TRY. Yours sincerely, David Paez University of Sevilla ___________________________________________________________________ Consigue tu e-mail gratuito TERRA.ES Haz clic en http://www.terra.es/correo/
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