Background
A rural 5-bedroom property experienced high electricity bills and frequent defrost cycles during colder winter months. The system had recently been commissioned, yet performance did not align with expected efficiency levels.
The homeowner suspected the issue may relate to commissioning settings rather than hardware.
Property & System Overview
Property: 5-bedroom rural home
Heat Pump: 12kW ASHP
Emitters: Radiators
Weather Compensation: Disabled
Observed Issue: High energy usage and unstable performance
Initial Observations
Commissioning errors are a common contributor to underperformance in heat pump systems. Small configuration mistakes can significantly affect efficiency, especially during colder weather.
Technical Findings
Our analysis identified:
Incorrect Flow Rate Settings
System flow rates were outside manufacturer recommendations, impacting heat transfer efficiency.Delta-T Misalignment
The temperature differential between flow and return was not optimised, reducing system stability.Weather Compensation Disabled
The absence of dynamic temperature adjustment forced the system to operate inefficiently.
Impact on Performance
These commissioning issues resulted in:
Increased defrost frequency
Higher compressor workload
Elevated electricity consumption
Reduced overall seasonal performance
Corrective Strategy
Recommendations included:
Correcting flow rates
Adjusting delta-T to manufacturer specifications
Enabling and calibrating weather compensation
Fine-tuning pump modulation
Outcome
After optimisation:
Defrost cycles reduced
System stability improved
Energy consumption decreased
Winter efficiency enhanced
The system was capable of performing correctly once properly commissioned.
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