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Hello, in my solar thermal system I want to define an acceptable interval for the collector outlet temperature [65-80°C] by giving an output signal=1 for the pump in the collector loop. For any other temperatures out of this range the signal should be=0 For this purpose I am using an Equation block!! (Is there any controller, that is able to do it?) I have defined these variables as: T_min=65 T_max=80 T_out= collector outlet temperature Signal=AND(GT(T_out,T_min),LT(T_out,T_max))*1+(1-AND(GT(T_out,T_min),LT(T_out,T_max)))*0 I have plotted the signal. It works fine but I am experiencing a very long simulation time. More than 15 minutes just for a week. Is there any idea? Thanks, Shahrdad |