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The Glass Pool · KAELTE

Chiller

Cooling — chiller, heat rejection, waste heat. Part of the glass family — like our glass BESS, biogas plant and CHP.

Chiller
Cooling demand → Chiller → Condenser → Dry cooler
Glass-box in 4 steps

Understand → See it live → What the AI does → Your benefit

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What the AI does
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What is Chiller?

The chiller produces chilled water for comfort and process cooling. Its efficiency (EER) is not a constant: it depends on the chilled water temperature, the condensing temperature and the condition of the heat exchangers.

Important in practice: the EER is rarely measured. It comes from cooling output divided by electrical input — which requires both figures, not just the chiller’s own display.

What is measured here

  • Chilled water flow and return plus flow rate → cooling output
  • Electrical power at the chiller feeder
  • Condensing temperature and outdoor temperature
  • EER as a computed figure from both

How we connect it — read-only

  • Cooling meter in the chilled water circuit over M-Bus.
  • Modbus meter at the chiller — the real electrical input.
  • Chiller controller over Modbus or BACnet for status and setpoints (read only).

Schematic (native, live)

Cooling — chiller, heat rejection, waste heat.

Cooling demandCondenserDry cooler

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

Live —

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What the AI does

  • Computes the EER continuously and detects a gradual decline.
  • Raises the chilled water temperature as far as demand allows.
  • Separates fouling from utilisation: if the EER falls at unchanged load, demand is not the cause.
  • Aligns chiller run time with PV hours where thermal mass allows.

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

EER loss in euros

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

Standards & norms

What the rules require — Chiller

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

Why is the EER not simply shown in the controller?

Because cooling output there is usually estimated from characteristic curves rather than measured. The EER only becomes reliable with a cooling meter and an electricity meter — then it is a computed but measured figure.

Basis: plant engineering

How much does a higher chilled water temperature gain?

Every degree of increase noticeably unloads the compressor. Exactly how much depends on the plant and the operating point — it becomes measurable immediately, because both electrical input and cooling output are captured.

Basis: plant engineering

How do you spot a fouled condenser?

The condensing temperature rises further above the outdoor temperature than it used to, and the EER falls at unchanged cooling output.

Basis: plant engineering

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