4. Modelling
How to model a residential heat pump water heater to AS/NZS 4234.
Phase 4 converts reviewed test data and product documents into AS/NZS 4234 annual simulation results and certificate quantities. Model setup, calibration, control settings, and annual simulations directly affect SRES, VEU, and ESS outcomes.
In this section
- TRNSYS Tool
- TRNSYS Template Selection
- Type 104 Modelling
- Flow Control – Separate Heat Pumps
- Detailed Parameter Review
- DTHX Calibration
- Frosting Penalty
- Control Settings
- 1D Analyser Tool
- 2D Analyser Tool
- Annual Simulations
- Calculating VEECs and ESCs
- Gate A Review
Phase sub-tasks
- Copy the current residential TRNSYS tool master and rename it with the project code.
- Enter project details and HP performance data.
- Select the correct TRNSYS template for the product type.
- Complete detailed parameter review.
- Run a test simulation to catch setup errors early.
- Complete DTHX calibration for integral HPWH where required.
- Calculate frosting penalty.
- Optimise control settings using 1D/2D analyser tools where useful.
- Run annual simulations and calculate certificate values.
- Prepare modelling outputs for Gate A review.
Gate A Review
When modelling is complete and results are ready, request a Gate A Review from a peer. Do not ask the client to approve certificate quantities until all Gate A findings are resolved.
Exit Gate
Phase 4 exits when Gate A passes and the client provides written approval of the modelling results/certificate quantities. Use the Client Approval Email.
The next phase is Phase 5 - Audit File Preparation.