HNTAS
Key Performance Indicators
The Heat Network Technical Assurance Scheme (HNTAS) defines a structured framework of 66 key performance indicators across five core network areas. These KPIs enable consistent monitoring of performance, efficiency, and reliability, requiring robust metering and software systems to collect, calculate, and report data, ensuring compliance and supporting effective network operation and management.
HNTAS KPIs Explained
HNTAS has broken down heat networks into 5 areas, and each one has a set of KPIs, these can be roughly broken down to the following amount of KPIs that a scheme would need to report on.
- Energy Centre – 20 KPIs
- District Distribution – 10 KPIs
- Substation – 19 KPIs
- Communal distribution – 9 KPIs
- Consumer connection – 8 KPIs
- Total =66 KPIs
Required HNTAS KPI Categories
- AMR connectivity
- Monitoring point completeness
- Monitoring point operation
- Unplanned and planned interruptions
- Distribution Heat loss
- Bypass flow rates
- VWAFT
- VWART
- VWATD
- Time weighted average flow temperature
- Time weighted average return temperature
- Flow temperature variance
- Flow temperature stability
- Flow temperature uptime
- Differential pressure uptime
- Differential pressure exceedance
- Operational pressure exceedance
- Volume top up
- Heat fraction
- Efficiency of heat generation
- Pump energy use
- Substation approach temperature
Ensuring HNTAS Compliance
To meet HNTAS requirements, every heat network must have an Automatic Meter Reading (AMR) system paired with a capable software package. This system should be able to retrieve, calculate, manage and export data for reporting and compliance purposes.
Beyond simply collecting data, it is crucial to maintain ongoing compliance with HNTAS standards. Staying compliant helps avoid regulatory fines and, in severe cases, enforcement actions that could affect your network operations.
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