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 idf for this zone, but the ventilation rate is > 0 in this Controller:MechanicalVentilation Object.
* ~~~ * ** ~~~ ** Check ventilation rate in Controller:MechanicalVentilation object. Simulation will continue.
* ** Warning
* ** Controller:MechanicalVentilation = "CONTROLLER MECHANICAL VENTILATION 2", Zone="THERMAL ZONE5-3".
* ~~~ * ** ~~~ ** No "PEOPLE" object has been specified in the idf for this zone, but the ventilation rate is > 0 in this Controller:MechanicalVentilation Object.
* ~~~ * ** ~~~ ** Check ventilation rate in Controller:MechanicalVentilation object. Simulation will continue.
* ** Warning
* ** Controller:MechanicalVentilation = "CONTROLLER MECHANICAL VENTILATION 2", Zone="THERMAL ZONE5-5".
* ~~~ * ** ~~~ ** No "PEOPLE" object has been specified in the idf for this zone, but the ventilation rate is > 0 in this Controller:MechanicalVentilation Object.
* ~~~ * ** ~~~ ** Check ventilation rate in Controller:MechanicalVentilation object. Simulation will continue.
* ** Warning
* ** SizeWaterCoil: Coil="COIL COOLING WATER 1", Cooling Coil has leaving air temperature > entering water temperature.
* ~~~ * ** ~~~ ** Tair,out = 12.800
* ~~~ * ** ~~~ ** Twater,in = 82.000
* ~~~ * ** ~~~ ** ....coil leaving air temperature will be reset to:
* ~~~ * ** ~~~ ** Tair,out = 82.500
* ** Warning
* ** SizeWaterCoil: Coil="COIL COOLING WATER 1", Cooling Coil is dry and has air leaving humidity ratio < entering humidity ratio.
* ~~~ * ** ~~~ ** Wair,in = 1.549437E-002
* ~~~ * ** ~~~ ** Wair,out = 8.500000E-003
* ~~~ * ** ~~~ ** ....coil leaving humidity ratio will be reset to:
* ~~~ * ** ~~~ ** Wair,out = 1.549437E-002
* ** Warning
* ** The design cooling capacity is zero for Coil:Cooling:Water COIL COOLING WATER 1
* ~~~ * ** ~~~ ** The maximum water flow rate for this coil will be set to zero and the coil will do no cooling.
* ~~~ * ** ~~~ ** Check the following coil design inputs for problems: Tair,in = 30.5044
* ~~~ * ** ~~~ ** Wair,in = 1.549437E-002
* ~~~ * ** ~~~ ** Twater,in = 82.0000
* ~~~ * ** ~~~ ** Tair,out = 82.5000
* ~~~ * ** ~~~ ** Wair,out = 1.549437E-002
* ** Warning
* ** Capacity ratio as a function of temperature curve output is not equal to 1.0
* ~~~ * ** ~~~ ** (+ or - 10%) at reference conditions for ChillerHeaterPerformance:Electric:EIR= CHILLERHEATERMODULE
* ~~~ * ** ~~~ ** Curve output at reference conditions = 1.166
* ** Warning
* ** Energy input ratio as a function of temperature curve output is not equal to 1.0
* ~~~ * ** ~~~ ** (+ or - 10%) at reference conditions for ChillerHeaterPerformance:Electric:EIR= CHILLERHEATERMODULE
* ~~~ * ** ~~~ ** Curve output at reference conditions = 0.717
* ** Warning
* ** Missing temperature setpoint on cooling side for CentralHeatPumpSystem named CENTRAL HP
* ~~~ * ** ~~~ ** A temperature setpoint is needed at the outlet node of a CentralHeatPumpSystem, use a SetpointManager
* ~~~ * ** ~~~ ** The overall loop setpoint will be assumed for CentralHeatPumpSystem. The simulation continues ...
* ** Warning
* ** Missing temperature setpoint on heating side for CentralHeatPumpSystem named CENTRAL HP
* ~~~ * ** ~~~ ** A temperature setpoint is needed at the outlet node of a CentralHeatPumpSystem, use a SetpointManager
* ~~~ * ** ~~~ ** The overall loop setpoint will be assumed for CentralHeatPumpSystem. The simulation continues ...
* ** Warning
* ** SizePlantLoop: Calculated Plant Sizing Design Volume Flow Rate=[0.00] is too small. Set to 0.0
* ~~~ * ** ~~~ ** ..occurs for PlantLoop=CONDENSER WATER 2ND LOOP
*** ************* Testing Individual Branch Integrity
*** ************* All Branches passed integrity testing
*** ************* Testing Individual Supply Air Path Integrity
*** ************* All Supply Air Paths passed integrity testing
*** ************* Testing Individual Return Air Path Integrity
*** ************* All Return Air Paths passed integrity testing
*** ************* No node connection errors were found.
*** ************* Beginning Simulation
*** ************* Beginning
SimulationSimulation
Thanks
