Plant-loop, air loop Hvac, for a central heating system with hot water
Hello,
I would like to design a central heating system for an apartment with more than 10 thermal zones. The steps that i follow with order are:
1) I am creating the plant loop by importing a hot water boiler (HW boiler), an adiabatic pipe, a setpoint manager (scheduled HW Temp) and finally all the Heating water coils (Coil Heating Water- one coil for a each thermal zone)
2) I am making an air loop HVAC for each coil by importing an empty air loop system. Into that loop i am placing the thermal zone in the demand equipment area. The coils are in the supply equipment.
3) I export the file into an *.idf file and then i use a heating thermal schedule for each thermal zone.
When i run the energyplus at the end, some of the severe errors are
"* Severe * Node NODE 5 connects to no component * ~~~ * Occurs in Supply Air Path=AIR LOOP HVAC 1 NODE 3 SUPPLY PATH * ~~~ * Check the connection to a ZoneHVAC:EquipmentConnections object * ~~~ * Check if this component is missing from the Supply Air Path * Severe * An outlet node in AirLoopHVAC="AIR LOOP HVAC 1" is not connected to any zone * ~~~ * Could not match ZoneEquipGroup Inlet Node="NODE 3" to any Supply Air Path or controlled zone * Severe * Node NODE 95 connects to no component * ~~~ * Occurs in Supply Air Path=AIR LOOP HVAC 10 NODE 93 SUPPLY PATH * ~~~ * Check the connection to a ZoneHVAC:EquipmentConnections object * ~~~ * Check if this component is missing from the Supply Air Path"
Could anybody give me some advice?
Thank you in advance.
----Matt Koch, thank you very much for your instant reply in my previous question! It was very helpful!
Do you have AirTerminal objects before each thermal zone in your air loop? If not, add them.
No i don't have any. What kind of Airterminal object do you think that should be proper for this simple heating system?
if the system does not have reheat, use an AirTerminal:SingleDuct:Uncontrolled. If the system does have reheat, use the appropriate AirTerminal:SingleDuct:VAV:Reheat object depending on your heat source.
Thank you very much. Your answer was very helfpful.
I can now export the openstudio file into an enerrgyplus file. At the end of the simulation, i have the below warnings for each thermal zone and air loop (there are more than ten thermal zones in my schedule).
* Warning * Calculated design heating load for zone=ZONE A1A is zero. * ~~~ * Check Sizing:Zone and ZoneControl:Thermostat inputs.
* Warning * ManageSizing: Calculated Heating Design Air Flow Rate for System=AIR LOOP HVAC 1 is zero. * ~~~ * Check Sizing:Zone and ZoneControl:Thermostat inputs.
Thank you in advance!