HVAC System Types

 

Common pre-defined HVAC System Types with default configurations are available to select in Asset Score.  Selecting one of the HVAC System Types listed below from the HVAC System Type pull down menu when editing the HVAC System in Preview mode, or when adding an HVAC System in Full input mode will automatically populate the default system components listed in the table below. These (and other) system types may also be manually added and edited in Full input mode by selecting the associated Equipment types, and the Cooling and Heating sources. Heating fuel types listed are defaults that may be edited, except for Heat Pumps which may only be assigned electricity in the tool.

                                                                                                                                                                                                                                             

Display

Equipment Type

Distribution Type

Cooling Source

Heating Source

Heating Fuel

Packaged Rooftop Air Conditioner (RTU)

Air Handler

Single Zone

Central DX

Central Furnace

Gas

Packaged Rooftop Heat Pump

Air Handler

Single Zone

Central DX

Heat Pump

Electricity

Packaged Rooftop VAV with Hot-Water Reheat

Air Handler

Multi Zone

Central DX

Plant: Boiler Plant Loop

Gas

Packaged Rooftop VAV with Electric Reheat

Air Handler

Multi Zone

Central DX

Central Furnace

Electricity

VAV with Hot-Water Reheat*

Air Handler

Multi Zone

Plant: Chiller Plant Loop
Plant: Boiler Plant Loop

Gas

VAV with Electric Reheat*

Air Handler

Multi Zone

Plant: Chiller Plant Loop

Central Furnace

Electricity

Warm Air Furnace

Air Handler

Single Zone

No Cooling

Central Furnace

Gas

Ventilation Only*

Air Handler

Single Zone

No Cooling

No Heating

 

Dedicated Outdoor Air System*

Air Handler

Single  Zone

Various - see below

Various - see below

Gas/Electricity

Packaged Terminal Air Conditioner (PTAC)

Zone Equipment

 

Terminal DX

Central Furnace

Gas

Window Air Conditioner

Zone Equipment


Terminal DX


No Heating


Baseboard*

Zone Equipment


No Cooling

Convective Baseboard

Electricity

Four Pipe Fan Coil Unit

Zone Equipment

 

Plant: Chiller Plant Loop
Plant: Boiler Plant Loop

Gas

Packaged Terminal Heat Pump (PTHP)

Zone Equipment

 

Terminal DX

Heat Pump

Electricity

Water-Loop Heat Pump*

Zone Equipment

Single Zone

Terminal DX

Heat Pump

Electricity

Ground Source Heat Pump*

Zone Equipment

Single Zone

Terminal DX

Heat Pump

Electricity

Variable Refrigerant Flow System (VRF)*

Zone Equipment


VRF

VRF

Electricity

 

* Asset Score Data Entry Notes:


Ventilation Only – Available as a selection for Air Handlers, a ventilation only (no cooling, no heating) system may only be assigned to a block with Parking Garage (Ventilation Only) selected as the use type.


VAV with Hot-Water Reheat and VAV with Electric Reheat -- For water-cooled chillers, first add a Condenser Plant Loop with a Cooling Tower Plant, then add a Cooling Plant Loop with a Chiller Plant and select the Condenser Loop so the Chiller Plant Loop and Condenser Plant Loop are linked.


Variable Refrigerant Flow System (VRF) – Available as a selection for Zone Equipment.  First add a VRV System, then add a Zone Equipment and select the VRF System to that they are linked. A VRF System may be combined with a DOAS.


Dedicated Outdoor Air System (DOAS) – Available only as a selection from the System Type pull down menu on the Air Handlers screen, the following combinations of heating and cooling sources are permitted for a DOAS entry:

  1. Heating Source = Plant; Cooling Source = Plant
  2. Heating Source = Furnace; Cooling Source = Central DX
  3. Heating Source = Heat Pump; Cooling Source = Central DX

Two component entries need to be created and assigned for a DOAS. DOAS is considered to be a 'Primary Ventilation' system, and will need to have a Zone Equipment added and assigned to a block as the 'Primary Heating/Cooling System' to complete the HVAC System entry. A DOAS may be combined with any Zone Equipment System Type except Baseboard.


Convective Baseboard: Electric – May be added as a Secondary Heating and Cooling System to a block after either a Window Air Conditioner, Packaged Terminal Air Conditioner, or Four Pipe Fan Coil Unit system has been created and assigned.


Convective Baseboard: Hot Water – May be added as a Secondary Heating and Cooling System to a block after either a Window Air Conditioner, Packaged Terminal Air Conditioner, or Four Pipe Fan Coil Unit system has been created and assigned. A Heating Plant Loop must be created and linked to this selection.


Water-Loop Heat Pump (WLHP) – Available as a selection for Zone Equipment.  Follow the steps below to create:

  1. Add a Condenser Plant Loop
  2. Select Cooling Tower as the Condenser Plant Type
  3. Add a Boiler Plant using the ‘Add a Boiler’ button
  4. Add Zone Equipment and select ‘Water-Loop Heat Pump’ from the HVAC System Type pull down menu
  5. Note that the Cooling/Heating Source, Fuel Type, and Sink/Source Type fields will have been automatically populated
  6. Select the Cooling Tower Condenser Plant Loop that was created in step one

Ground Source Heat Pump (GSHP) – Available as a selection for Zone Equipment.  Follow the steps below to create:
  1. Add a Condenser Plant Loop
  2. Select Ground Heat Exchanger as the Condenser Plant Type
  3. Add Zone Equipment and select ‘Ground Source Heat Pump’ from the HVAC System Type pull down menu
  4. Note that the Cooling/Heating Source, Fuel Type, and Sink/Source Type fields will have been automatically populated
  5. Select the Ground Heat Exchanger Condenser Plant Loop that was created in step one


Note: DOAS, VRF, WLHP, and GSHP system types are available only for selection in Full Input Mode.  Additional default system components for Fan Control, Terminal Unit, and Condenser Loop Type are listed in Appendix C of the Data Collection Form.