# SS-KPI-09A SS volume weighted average flow temperature

> SS volume weighted average flow temperature: [network flow temp] ± 3 °C. Substation KPI, HNTAS · assessed. Monitoring points, threshold and calculation.

| | |
|---|---|
| Element | Substation (SS) |
| Standing | HNTAS · assessed |
| Monitoring points | SS1 · 5 min · tF (heat meter, else sensor); heat meter m³/h |
| Threshold | [network flow temp] ± 3 °C |
| Calculation | Σ(tF · volume) ÷ Σ(volume). Uses design/tFOff |
| Period | Monthly |


## Discuss this KPI

Is the threshold right? Does the calculation match what you compute on your networks? [Comment on SS-KPI-09A](https://github.com/heatweb/HNQAP/issues/new?template=kpi-comment.yml&kpi=SS-KPI-09A&title=SS-KPI-09A%3A%20), or report how it behaves on your data. Comments are public and are read before every revision.

## Machine-readable

This KPI is a row of [kpi-reference.json](/data/kpi-reference.json) (element `SS`, code `SS-KPI-09A`). The [notation and rules](/kpis/#how-to-read-the-tables) that apply to every KPI are on the reference page.

## Related KPIs on the substation

- [SS-KPI-01 Substation ARMS connectivity](/kpis/ss-kpi-01/)
- [SS-KPI-02 Substation monitoring point data completeness](/kpis/ss-kpi-02/)
- [SS-KPI-03 Substation monitoring points operational](/kpis/ss-kpi-03/)
- [SS-KPI-04 Substation unplanned interruptions](/kpis/ss-kpi-04/)
- [SS-KPI-05 Substation planned interruptions](/kpis/ss-kpi-05/)
- [SS-KPI-06 Substation average flow temperature](/kpis/ss-kpi-06/)
- [SS-KPI-07 Substation average return temperature](/kpis/ss-kpi-07/)
- [SS-KPI-08 SS flow temperature variance from set point](/kpis/ss-kpi-08/)