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Maurizio, It looks from what you describe as though your best option would be to write a new controller component. You cannot directly implement the IF..THEN..ELSE structure using EQUATIONS in an input file.Often times you can fake an IF..THEN..ELSE statement using one of the Boolean functions as a multiplier on the variables that you wish to set. For example, if your condition were: IF (T_supply_air < T_set_supply - dT_dec) THEN mode = -1 mode_status = 0 ELSE mode = 1 mode_status = 0 ENDIF then you could get the same effect by putting the following in your input file: EQUATIONS 3 ModeCheck = LT(T_supply_air,(T_set_supply - dT_dec)) !ModeCheck has a value of 1 when T_supply_air is less than T_set_supply-dT_dec and 0 otherwise mode = -1*ModeCheck + 1*(ModeCheck-1) mode_status = 0 however, the control scheme that you describe below is too complex for such tricks I think. The other alternative is that you might be able to implement your control strategy in Type40. The Simulation Studio equation tool is described in section 2.7 of the Simulation Studio manual (volume 2 of the TRNSYS 16 documentation set). There is additional information about the functions that can be implemented in equations in section 7.6.8 of the 07-TRNEdit manual. Kind regards, David -- David BRADLEY TRNSYS Engineer Solar Energy Laboratory - University of Wisconsin, Madison 1500 Engineering Drive Madison, WI 53706 United States ph: +1 608 263 1589 fax: +1 608 262 8464 email: dbradley@engr.wisc.edu |