Detailed Parameter Review

Start with client communication: Draft an email listing any inconsistencies or errors found in the TDS for client review and resolution.

How to Review

Step through each TDS parameter cell and verify the values. The tool includes helpful notes in column C for each parameter.

Cell marking:

• Yellow “neutral” — unsure or cannot verify
• Red “bad” — believe to be incorrect
• Follow up with the client to clarify marked parameters

Product Identity

1. Brand name: Verify from the AS/NZS 5125 test report. Should be the manufacturer, not the test lab. Add to Contact sheet if needed.
2. Model name: Ensure it matches the AS/NZS 5125 report and AS/NZS 2712 certificate (if available).
3. Date_2712: Input the AS/NZS 2712 certification date when available. Often obtained post-modelling, so OK to leave blank initially.
4. AS/NZS 2712 Certificate: Check if provided. If not, try downloading from SAI Global or IAPMO. Leave blank if unavailable.

Tank Parameters

5. Tank model consistency: Confirm the tank model number matches across all documents, including the data plate in the AS/NZS 5125 report.
6. Tank volume and heat loss: Verify volumes are measured from the inside. Cross-check tank heat loss value in the AS/NZS 4692 report.
7. Tifr (initial frosting temperature): Confirm it is the lowest ambient temperature in AS/NZS 5125 test condition 1 (typically 7–9°C dry bulb).
8. Volume above sensor (Voltht): Ensure it is at least 45% of total tank volume (Voltht/Voltot > 0.45).

Performance Coefficients

9. Regression temperature: Check whether AS/NZS 5125 used Tw (average tank) or Twi (inlet) for COP/Power regression. Ensure TRNSYS Tool parameters “Temp1” and “Temp2” match the same temperature.
10. Coefficient consistency: Verify all p0–p3 and a0–a3 coefficients in the TDS match the AS/NZS 5125 report.
11. Frosting penalty (FP): Will be calculated later — no immediate validation needed.

Condenser (Integral HP)

12. Condenser measurements: For integral HP, verify condenser dimensions from the tank drawing. DTHX will be calculated later.
13. Microchannel HX: If applicable, calculate:
    • Length = (length of one strip) × (number of strips)
    • Diameter = sum of microchannel widths
    • Tube thickness = distance from microchannel to tank wall

Electric Element and Controls

14. Taux check: For Class A HP, ensure Taux < −5 (no element required). Otherwise, Taux = Tifr. The element switches on when ambient dry bulb temperature falls below Taux.
15. Element presence: Check the tank drawing. If absent, use dummy values:
    • Tset2 = 60, Tdb2 = 10, Aux2 = 0
    • Volaux2 = 0.9 × Voltot, Volhth2 = Volaux2 − 20
    • Set both HP and boost control strategies to “C” (continuous)
16. Legionella control strategy: Verify it matches AS 3498:2020 Section 7. For Class B HP, cross-check element volume and setpoint.

Piping (Separate/Stand-alone HP)

17. Pipe specifications: Confirm piping units are in mm and consistent with TRNSYS tool units. Minimum pipe length: 5 m for separate HP.