Select and add a ‘VRF System’ if the HVAC System of your building includes a Variable Refrigerant Flow (VRF) system.  This creates the VRF outdoor unit. After creating a VRF System, create the VRF terminal units through the ‘Zone Equipment’ option in the tool. The VRF zone terminals can then be selected and assigned to blocks by ‘dragging and dropping’.   See the Heating and Cooling page for additional details. 

Typically, VRF Systems:

  • Provide both heating and cooling
  • Include a single outdoor unit that serves multiple indoor terminal units
  • Include indoor units that vary refrigerant flow in evaporating coils to meet individual zone loads
  • Are ductless
  • Are more energy efficient than conventional heat pump systems
  • Include indoor units that come in variety of configurations (e.g. ceiling, floor, wall units)


VRF systems modeled for TSPR are air cooled and not water cooled. VRF systems can be coupled with Dedicated Outdoor Air Systems (DOAS). If a DOAS system is not assigned to a block with VRF systems, ventilation will be modeled through the VRF system itself. See the Heating and Cooling page for additional details. 


Adding a VRF System for TSPR

Add an outdoor unit of the VRF System, then link to indoor terminal units (Zone Equipment) by following the steps below:

  1. Select the ‘+’ (Add) icon from the VRF Systems sidebar option on the Heating and Cooling page  
  2. Enter a descriptive name (or use the default component text)
  3. Enter the Cooling and Heating Efficiency (in COP).  The COP input should exclude supply fan power (fan power is modeled explicitly in the TSPR tool) 
  4. Select the green ‘Create’ button to add the component
  5. Add a Zone Equipment, and enter a descriptive name (or use the default component text)
  6. Select VRF as the System Type.  This will automatically assign VRF as the Cooling and Heating Source 
  7. Select the VRF System that was created in step 1 from the Linked VRF System drop down menu to link to the Zone Equipment