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): The lowest air (dry bulb) temperature recorded during AS/NZS 5125 test condition 1 (TC1), typically 7–9°C. Tifr always comes from TC1, which is a performance test condition. Do not take it from TC5. TC5 is the separate low temperature test used for frosting penalty calibration and has nothing to do with Tifr.
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.
    • Two correlation sets: Some reports give two correlation sets (for example a Twavg-based set and a Tin-based set, as some Vipac reports do). Use the set with the better R². If either set reaches R² > 0.95, require both COP and Power above 0.95. Otherwise take the set with the higher average of the COP and Power R². Automated text extraction usually grabs the first table in the report, so check which set was used and switch to the other if it scores better.
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)
    • Tube diameter (dia_tube) = extrusion width − 2 × extrusion wall thickness. This is the internal slot diameter, not the extrusion width itself. Do not set dia_tube equal to the extrusion width.
    • Tube thickness = distance from microchannel to tank wall

Electric Element and Controls

14. Taux (element activation temperature): The element only switches on when the ambient dry bulb falls below Taux. Set Taux to −5, −7, or −10°C as appropriate so the element almost never fires. Use −7 as the default when no value is specified. Do not set the element to fire at Tifr.
15. Element capacity: Model the element at the capacity of the element actually installed in the tank. Read the rated element capacity from the electrical safety certificate and the data plate. Do not model an installed element as a disabled dummy. The remaining element control values stay at the standard settings:
    • Tset2 = 60, Tdb2 = 10
    • Aux2 = installed element capacity (kW)
    • Volaux2 = 0.9 × Voltot, Volhth2 = Volaux2 − 20
    • Set both HP and boost control strategies to “C” (continuous)
    • If the tank drawing shows no element at all, model it as a disabled dummy with Aux2 = 0.
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.