Determine the surface reserve
If a fixed capacity is given, the MPC offers the possibility to search for the so-called surface reserve. For this purpose, go to the input mask Input data and activate in the tab thermodynamics the calculation mode state fixed capacity (adjust surface reserve). After entering the capacity, the MPC will determine the required heat exchanger surface via the thermodynamic calculation of the heat transfer coefficient (U value). If you compare the calculated surface with the actual surface of the selected unit, you will obtain the value for the surface reserve that is in general higher than the performance reserve.