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MEDI · District energy

Euroméditerranée District Energy Network

A seawater-source district-heating network: two intake pumps and two seawater exchangers feeding three heat pumps, two backup boilers and a stratified thermal store, distributing through two network pumps and a differential-pressure valve to thirty consumer substations. The network is simulated; the city under it is not — every substation sits on its real IGN BD TOPO® building footprint in the Euroméditerranée quarter. It is a demonstration network on open data, not any operator's plant.

The DjiniousCC 3D city twin over Marseille: 3,356 extruded IGN BD TOPO building footprints on live IGN orthophoto imagery, with thirty consumer substations picked out in amber and ringed by red alarm halos, the network tree on the left and a live time scrubber below.The DjiniousCC 3D city twin over Marseille: 3,356 extruded IGN BD TOPO building footprints on live IGN orthophoto imagery, with thirty consumer substations picked out in amber and ringed by red alarm halos, the network tree on the left and a live time scrubber below.
3,356 real BD TOPO buildings on live IGN imagery, with no Cesium ion account behind it. Amber marks a building that carries an instrumented substation; grey is context only, and the legend says so rather than letting you assume the whole city is wired.Mistral Urban Energy · Marseille, France
44
assets modelled
301
live tags at 1 Hz
5
procedure steps
3
assertions checked
EQUIPMENT

What the platform models here

Each family has a behavioural model that the live simulator and the proving twin share, so a dry-run behaves the way the plant does.

  • Seawater intake pumps
  • Seawater exchangers
  • Heat pumps
  • Backup boilers
  • Stratified thermal store
  • Network pumps
  • Differential-pressure valve
  • Consumer substations
THE STANDING PROBLEM

A cold snap asks for more heat than the network was built to deliver

The thirty substations sum to 1,319,287 W/K of heat-loss coefficient. At −4 °C that demands far more than the plant's installed capacity — three heat pumps derated by seawater temperature, two 1,800 kW boilers and a store that can only discharge at 2,000 kW. The supply header sags 21.2 K below its compensation setpoint and every substation downstream starves. You cannot serve everyone; you have to decide who gets trimmed, and be able to show why.

THE PROCEDURE

District Peak Shaving

district-peak-shaving

Carry the network through a cold-snap capacity shortfall without letting the supply header collapse: bring on backup boilers, discharge the store, raise the compensation curve, then stage valve-limit setbacks across the lowest-criticality substations.

  1. 01Start backup boiler B01
  2. 02Raise supply compensation curve → +6 K
  3. 03Duty-engineer confirmation
  4. 04Stage 1 setback — SST16…SST30 valve limit 70 % (fifteen substations, one command each)
  5. 05Notify control room

C4 · operational action

THE PROOF

Cold Snap Capacity Shortfall

Ambient falls from +2 °C to −4 °C five minutes into a thirty-minute run, on a seeded clock — the same snap, tick for tick, every time it is run.

Assertion results for the Cold Snap Capacity Shortfall scenario, run without the procedure and with it.
AssertionBaselineWith procedure
Supply header ≥ 67 °C61.63 °C72.50 °Cpass
Peak capacity shortfall ≤ 23 000 kW24 145 kW22 419 kWpass
Six largest substations hold ≥ 23 K ΔT19.93 K27.66 Kpass

Seventeen commands intercepted on the isolated twin. Note what this does not claim: a 22,419 kW shortfall remains after mitigation. This is peak shaving, not peak solving — the network is genuinely undersized for this snap, and the procedure's job is to hold the header up and triage the load, which the measured numbers show it doing.

IN THE PRODUCT

What the control room sees

The same city twin switched to Energy mode, showing load-coloured substations and per-substation load columns, with the legend calling it an analysis layer.The same city twin switched to Energy mode, showing load-coloured substations and per-substation load columns, with the legend calling it an analysis layer.
The Energy layer labels itself: analysis, not an operator display. ISA-101 says the operator view stays neutral, so the analytical colouring lives behind a toggle.
The DjiniousCC simulation page with baseline and with-process dry-run results and the history of runs.The DjiniousCC simulation page with baseline and with-process dry-run results and the history of runs.
The cold snap, run twice. Baseline fails three of its assertions; with the procedure, all of them hold.

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