The Glass Pool · KUECHE

Dishwashing line

Kitchen — refrigeration, dishwashing, cooking, exhaust. Part of the glass family — like our glass BESS, biogas plant and CHP.

Dishwashing line
Hot water Dishwashing line Heat recovery Waste water
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What the AI does
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What is Dishwashing line?

The dishwashing line needs water, heat and electricity at the same time — and it runs in bursts right after service. That makes it one of the most plannable loads in the building: the timing can move, the work stays the same.

Modern installations recover heat from the waste water and the vapour. Whether that recovery actually works shows only in the temperature difference — not in the data sheet.

What is measured here

  • Electrical power of the dishwashing line (sub-meter)
  • Fresh and hot water demand per wash cycle
  • Vapour and waste water temperature before and after heat recovery
  • Operating window relative to the building’s demand peak

How we connect it — read-only

  • Modbus sub-meter on the dishwashing line feeder.
  • Heat meter in the hot water supply over M-Bus.
  • Temperature sensors before and after the heat recovery unit.

Schematic (native, live)

Kitchen — refrigeration, dishwashing, cooking, exhaust.

Hot waterHeat recoveryWaste water

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Live —

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What the AI does

  • Moves wash cycles out of the window in which the annual peak forms.
  • Verifies heat recovery in operation — if it works, the difference falls measurably.
  • Detects idle running: the machine standing hot without washing anything.
  • Couples the hot water demand to tank charging instead of running both at once.

Method proven on a live European reference aquatic center; presented anonymously.

Load-shift effect

Estimate from metered / design values. Zero-grid-import windows are real (metered).

Standards & norms

What the rules require — Dishwashing line

Grounded in DIN 19643, VDI 2089, DGfdB and the German Buildings Energy Act. Same knowledge base as the European reference site; presented anonymously.

How much energy does one wash cycle use?

That depends on machine type, rack count and water temperature and cannot be stated seriously without measurement. That is exactly why the sub-meter goes in: afterwards the real number is established rather than estimated.

Basis: plant engineering

Does heat recovery on the dishwashing line really pay?

It can pay well, but it fouls and fails silently. The only proof is the temperature difference before and after the exchanger — if it narrows, recovery has stopped working.

Basis: plant engineering

Why does the timing of dishwashing matter?

Because the demand charge hangs on the highest quarter-hour. If the dishwashing line runs alongside refrigeration and cooking, that is exactly where the annual peak forms — spread out, the same work costs less.

Basis: plant engineering

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