Compile HP Parameters
How to enter heat pump parameters in the FAM_COM sheet of the Commercial TRNSYS Tool.
HP parameters are entered in the FAM_COM sheet of the Commercial TRNSYS Tool. These define how the heat pump behaves in the simulation and feed directly into the AS/NZS 4234 modelling results.
All parameter values must be traceable to a source document. Include a screenshot or reference to the source for each parameter so the reviewer can verify against the original documents.
Heat Pump Performance
| Parameter | Source | Notes |
|---|---|---|
| Performance map file (HPdata.txt) | Generated from ComHPdata sheet | Must be created before parameters are entered. See Create EN 14511 Performance Map |
| Standby power (W) | EN 14511 test report | Power consumption when HP is not actively heating. Stated separately in the test report |
| Refrigerant type | Data plate or test report | e.g. R-290, R-744 (CO2), R-32 |
| Refrigerant charge (kg) | Data plate or test report | Required for the Com_Results output sheet |
Control Settings
| Parameter | Source | Notes |
|---|---|---|
| HP setpoint temperature (°C) | Control declaration / installation manual | Temperature the HP heats water to |
| HP deadband (°C) | Control declaration / installation manual | Temperature drop below setpoint before HP switches on |
| Legionella control temperature (°C) | Control declaration | Typically 60°C |
| Legionella control frequency | Control declaration | Daily or weekly — affects energy consumption modelling |
| Boost element setpoint (°C) | Control declaration / manual | If electric element is fitted |
| Boost element deadband (°C) | Control declaration / manual | If electric element is fitted |
Control settings have a significant effect on certificate outcomes. Always confirm with the client that the settings modelled match the actual factory default settings for the product.
Flow Rate
| Parameter | Source | Notes |
|---|---|---|
| Pump flow rate (L/s or L/min) | Pump test report / hydraulic analysis | Flow rate through the HP circuit at operating conditions |
| Pump input power (W) | Pump test report | Included in system energy consumption calculation |
| Flow control type | System schematic / control logic | Fixed flow or variable flow |
For variable flow systems, the flow rate is modulated by the control logic (e.g. to maintain a fixed HP outlet temperature). The flow control algorithm must be described in the documentation and replicated in the TRNSYS template. Use the VariableFlow template variant — see Identify TRNSYS Template.
For fixed flow systems, enter a single flow rate value from the pump specifications.
Number of Units
| Parameter | Source | Notes |
|---|---|---|
| Number of HP units | System schematic | For systems with multiple HP units plumbed in parallel |
| Number of tanks | System schematic | For systems with multiple tanks |
| Total system storage volume (L) | Tank drawing × number of tanks | Used for LoadFactor calculation under VEU |
System Zone and Load Sizes
| Parameter | Notes |
|---|---|
| Climate zones | Zones 3, 4, and 5 are required for VEU and ESS. Select all three. |
| Initial CPL guess per zone | Provide a starting estimate before running the Find Loads algorithm. See Finding Commercial Peak Load. |
Review Before Running Simulations
Before triggering the first simulation, do a final parameter check:
- All required cells are filled — no blank cells in mandatory parameter rows.
- HP setpoint and deadband are consistent with the control declaration.
- Flow rate is reasonable for the system size
- Number of HP units and tanks match the system schematic.
- Refrigerant charge is entered — this populates the Com_Results sheet.
- Performance map file path is correctly linked (check the ComHPdata sheet).