2D Analyser Tool

The 2D Analyser sweeps two variables simultaneously, running all combinations to find the optimal pair. This is useful for weekly legionella control, where both setpoint (50–55°C) and deadband (3–7 K) can be optimized.

Steps

1. Verify heat pump capability: Check AS/NZS 5125 test data to confirm the HP can heat the bottom sensor (T6) above 60°C. Note the mid-tank sensor temperature (Tset_HP_w) when the bottom reaches 60°C — typically 61–64°C.

2. Open the “2D Analyser” sheet in the TRNSYS Tool.

3. Select the model from the dropdown.

4. Configure the analysis:

   • Load size: Choose load 2 (medium) for better accuracy. If it passes load 2 in 2021, it should pass load 2 in 2008.
   • Zones: Use zones 3–5 (or zone 5 only if time is limited)
   • AS/NZS 4234 version: Select 2021 for current systems

5. Define the sweep ranges — e.g., setpoint 50–55°C vs. deadband 3–7 K.

6. Import and review results to identify the optimal setpoint/deadband combination.