align PTAC and PTHP coils with EnergyPlus

[MatthewSteen]

Enhancement Request

I don't have an immediate need for this, but the ZoneHVACPackagedTerminalAirConditioner and ZoneHVACPackagedTerminalHeatPump objects only allow CoilCoolingDXSingleSpeed coils, which doesn't align with EnergyPlus. The following have been allowed by EnergyPlus for a while and are available in the SDK. Also, PTHPs only allow CoilHeatingDXSingleSpeed coils.

Packaged Terminal Air Conditioner Coils

• CoilCoolingDXVariableSpeed
• CoilSystem:Cooling:DX:HeatExchangerAssisted

Packaged Terminal Heat Pump Coils

• CoilCoolingDXVariableSpeed
• CoilSystem:Cooling:DX:HeatExchangerAssisted
• CoilHeatingDXVariableSpeed

Detailed Description

Here's an example, which will give the same message for the HeatExchangerAssisted coil for both PTACs and PTHPs.

require 'openstudio'
include OpenStudio::Model
m = Model.new
f = FanConstantVolume.new(m)
hc = CoilHeatingElectric.new(m)
cc = CoilCoolingDXVariableSpeed.new(m)
ptac = ZoneHVACPackagedTerminalAirConditioner.new(m, m.alwaysOnDiscreteSchedule, f, hc, cc)

[openstudio.model.ZoneHVACPackagedTerminalAirConditioner] <0> Invalid Cooling Coil Type (expected CoilCoolingDXSingleSpeed, not 'OS_Coil_Cooling_DX_VariableSpeed') for Object of type 'OS:ZoneHVAC:PackagedTerminalAirConditioner' and named 'Zone HVAC Packaged Terminal Air Conditioner 1'
=> #<OpenStudio::Model::ZoneHVACPackagedTerminalAirConditioner:0x000000025efd88 @__swigtype__="_p_openstudio__model__ZoneHVACPackagedTerminalAirConditioner">

Possible Implementation

Allow the coils above. Consider adding objects to the hvac_library.osm in the OpenStudioApplication.