Flow Control – Separate Heat Pumps
Checks for flow rate and control on separate heat pump systems.
Pump Type and Flow Rate
- Check pump type: Is it constant speed or variable? This determines the TRNSYS template selection and pump modelling approach.
- Check pump flow rate: Obtain from the AS/NZS 5125.1 test report.
Flow Control
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Determine whether flow is controlled or uncontrolled. Reference: AS/NZS 4234 Clauses 3.7.3, 3.7.4, H3.2.
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If controlled flow, verify evidence is provided for:
- Flow meter installed at each installation
- Flow meter used during commissioning
- Flow rate set by controller
- Orifice restrictor instructions
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If variable flow: Check that the HP is tested over a range of flow rates.
Piping
- Pipe length: Modelled pipe lengths to and from the HP must be at least 5 m.
- Pipe diameter and insulation: Obtain evidence for specifications, otherwise use 16 mm inner diameter as default.