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The Glass Pool · WAESCHEREI

Dryers & exhaust heat recovery

Laundry — washing, drying, ironing. Part of the glass family — like our glass BESS, biogas plant and CHP.

Dryers & exhaust heat recovery
Washer → Dryer → Exhaust heat recovery → Hot water
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What is Dryers & exhaust heat recovery?

The dryer is the laundry’s largest single electrical load. It evaporates water and blows the warm, humid air outside — along with the energy just put into it.

Two things decide consumption: the residual moisture a cycle ends at, and the lint filter. A clogged filter cuts airflow, the cycle runs longer and consumption rises — without any fault being reported.

What is measured here

  • Electrical power per dryer (sub-meter)
  • Cycle duration per load — the early indicator for filter and air path
  • Exhaust temperature and humidity
  • Recovered heat where exhaust heat recovery exists

How we connect it — read-only

  • Modbus sub-meters per machine or feeder.
  • Temperature and humidity sensors in the dryer exhaust.
  • Heat meter on the recovery circuit over M-Bus.

Schematic (native, live)

Laundry — washing, drying, ironing.

WasherExhaust heat recoveryHot water

Overview: The Glass Pool → · Markets: pool markets →

Live —

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loading

What the AI does

  • Detects a growing cycle duration at unchanged load size — lint filter or air path.
  • Places energy-intensive cycles in PV and low-price hours.
  • Staggers multiple dryers instead of letting them start together.
  • Verifies exhaust heat recovery in operation rather than on the data sheet.

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

Shiftable dryer load

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

Standards & norms

What the rules require — Dryers & exhaust heat recovery

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

Why does cycle duration matter more than connected load?

Connected load is on the nameplate and never changes. Consumption changes through run time: the same cycle takes longer with a clogged filter, and therefore uses more energy.

Basis: plant engineering

Is heat recovery on dryer exhaust worth it?

The exhaust is warm and humid, so the potential is real. Whether it is harvested shows only in measurement: temperature before and after the exchanger plus the recovered energy.

Basis: plant engineering

Can dryers be shifted into cheap hours?

In most properties yes, because the linen does not have to be finished to the minute. The order of the loads stays; only their position in the day changes.

Basis: plant engineering

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