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The kOAinitiative

Cooling & Water

Kristal Farms is designed around a simple principle: cooling should not waste water, and heat should not be rejected by default.

This page explains what the cooling and water system delivers—efficiency, safety, and predictable compliance—without turning into a mechanical engineering manual.


What this subsystem delivers

Reliable cooling

Use cold climate conditions and simple heat-exchange building blocks so the system stays stable, efficient, and maintainable.

Low water footprint

Avoid evaporative cooling towers. The intent is near-zero ongoing water consumption for cooling, with closed-loop operation.

Environmental compliance

Strict discharge temperature limits, continuous monitoring, and designed operating modes that prioritize compliance over compute throughput.


Design principles (non-negotiables)

  1. Heat-first hierarchy: reuse → store → reject.
    Cooling exists, but heat recovery is the default (district heat + greenhouse support).

    Heat-first design →

  2. Closed loops, separated by heat exchangers:
    The compute cooling loop and the community heating loop remain physically separated. Heat is transferred through non-contact plate heat exchangers.

  3. No “mystery mixing”:
    Bay/seawater (when used as a heat sink) is kept on its own loop, separated by appropriate materials and interfaces.

  4. Fail-safe behavior beats maximum utilization:
    If the system cannot prove compliant operation, it should degrade safely—not silently run hotter, dump heat, or improvise.


How it works (conceptual)

  1. 1Compute loop collects heat from the pad/container (liquid cooling loop).
  2. 2Non-contact heat exchanger transfers heat into the district heat loop (no mixing).
  3. 3Useful heat is delivered to buildings and/or greenhouses as a priority load.
  4. 4Thermal storage absorbs variation (smoothing supply/demand differences).
  5. 5

    Only after reuse + storage, remaining heat is rejected through compliant modes (e.g., via a bay/seawater loop through a non-contact exchanger, or dry coolers as backup).


Water use: designed to avoid “cooling towers economics”

The objective is to avoid evaporative cooling towers (which consume water continuously). Instead:

In practice, this keeps water use low and makes compliance easier to verify.


Environmental protection & discharge rules

A responsible cooling system is one you can audit.

We treat environmental constraints as operating rules:

What gets measured
  • Supply/return temperatures (compute loop and district loop)
  • Flow rates and pressure differentials
  • Heat recovered vs heat rejected
  • Thermal storage state
  • Discharge temperatures and compliance margins (when rejecting heat)

Failure modes & safeguards (what we plan for)

Typical risks

  • Leak / loss of pressure: isolate loop sections, alert operator, fail safe.
  • Heat demand mismatch: route to storage, then reject via compliant mode if necessary.
  • Sensor/telemetry failure: degrade to conservative mode (compliance-first behavior).
  • Extreme weather / marine conditions: operate on backup rejection paths without violating discharge rules.

Detailed safety and environmental controls live on the dedicated page:

Environment & safety →