Dear all,

I am simulation a building using Openstudio and E+. The HVAC system is composted by a multifunctional heat pump (it makes simultaneously heating and cooling), a ground water condenser and cooled beams as air terminals that provided both the cooling and the heating in the zones. I have used the CentralHeatPumpSystem to simulate the multifunctional heat pump. I have used the PlantComponent:TemperatureSource to simulate the ground water used as condenser I have used the FourPipeInduction Air terminals to simulate the cooled beams. I can't understand why the simulation doesn't work properly and I have problems with the sizing of the objects and the convergence of the temperature.

Has someone of you any idea how should I do to solve this issue? I attach the idf below.

Thank you very much

Have a nice day

Elena

part of the error message:

************* Beginning System Sizing Calculations
************* Beginning Plant Sizing Calculations
** Warning ** In calculating the design coil UA for Coil:Cooling:Water HW CHW FOUR PIPE INDUCTION TERMINAL CHW CLG COIL 2
**   ~~~   ** the apparatus dew-point is below the coil design inlet water temperature;
**   ~~~   ** the coil outlet design conditions will be changed to correct the problem.
**   ~~~   ** The initial design conditions are: Tair,in = 25.9833
**   ~~~   **                                    Wair,in = 9.554298E-003
**   ~~~   **                                    Twater,in = 7.2200
**   ~~~   **                                    Tair,out = 9.2200
**   ~~~   **                                    Wair,out = 6.585921E-003
**   ~~~   ** The revised design conditions are: Tair,out = 9.2195
**   ~~~   **                                    Wair,out = 6.586107E-003
** Warning ** In calculating the design coil UA for Coil:Cooling:Water HW CHW FOUR PIPE INDUCTION TERMINAL CHW CLG COIL
**   ~~~   ** no apparatus dew-point can be found for the initial entering and leaving conditions;
**   ~~~   ** the coil outlet design conditions will be changed to correct the problem.
**   ~~~   ** The initial design conditions are: Tair,in = 25.9845
**   ~~~   **                                    Wair,in = 1.167724E-002
**   ~~~   **                                    Twater,in = 7.2200
**   ~~~   **                                    Tair,out = 9.2200
**   ~~~   **                                    Wair,out = 6.585921E-003
**   ~~~   ** The revised design conditions are: Tair,out = 9.2195
**   ~~~   **                                    Wair,out = 6.586107E-003
** Warning ** In calculating the design coil UA for Coil:Cooling:Water HW CHW FOUR PIPE INDUCTION TERMINAL CHW CLG COIL 1
**   ~~~   ** the apparatus dew-point is below the coil design inlet water temperature;
**   ~~~   ** the coil outlet design conditions will be changed to correct the problem.
**   ~~~   ** The initial design conditions are: Tair,in = 25.9901
**   ~~~   **                                    Wair,in = 9.862493E-003
**   ~~~   **                                    Twater,in = 7.2200
**   ~~~   **                                    Tair,out = 9.2200
**   ~~~   **                                    Wair,out = 6.585921E-003
**   ~~~   ** The revised design conditions are: Tair,out = 9.2195
**   ~~~   **                                    Wair,out = 6.586107E-003
** Warning ** In calculating the design coil UA for Coil:Cooling:Water HW CHW FOUR PIPE INDUCTION TERMINAL CHW CLG COIL 3
**   ~~~   ** the apparatus dew-point is below the coil design inlet water temperature;
**   ~~~   ** the coil outlet design conditions will be changed to correct the problem.
**   ~~~   ** The initial design conditions are: Tair,in = 25.9832
**   ~~~   **                                    Wair,in = 9.506870E-003
**   ~~~   **                                    Twater,in = 7.2200
**   ~~~   **                                    Tair,out = 9.2200
**   ~~~   **                                    Wair,out = 6.585921E-003
**   ~~~   ** The revised design conditions are: Tair,out = 9.2195
**   ~~~   **                                    Wair,out = 6.586107E-003
** Warning ** Controller:MechanicalVentilation = "CONTROLLER MECHANICAL VENTILATION 2", Zone="THERMAL ZONE5-1".
**   ~~~   ** No "PEOPLE" object has been specified in the ...