Dual-Use Seawater Cooling & Lagoon Exchange
A concept for evaluating whether the cooling infrastructure required by future coastal AI data centers can also create a measurable public benefit for the Indian River Lagoon.
The Question Worth Asking
Florida's Treasure Coast is beginning to face a new infrastructure question: how should the region accommodate very large data centers and artificial-intelligence computing facilities while protecting electric-rate payers, water resources and the Indian River Lagoon?
One option worth evaluating is whether the cooling requirements of future coastal data centers could be coupled with a managed seawater exchange system. The data center would receive a potentially efficient means of rejecting heat. The same seawater pumping infrastructure could then be evaluated for a second function: environmentally controlled movement of ocean water in support of lagoon or inlet water-quality objectives.
How the Engineering Could Work
Ocean water would not circulate through computer equipment. Two physically separate water loops would exchange heat through corrosion-resistant marine heat exchangers.
Marine Loop
Atlantic intake → pump station → titanium or equivalent seawater heat exchanger → controlled marine return.
Intake depth, pipeline length, screening, pumping head and materials would be determined from bathymetry, temperature profiles, marine-growth conditions, hurricane survivability and environmental criteria.
Data-Center Loop
GPU/server liquid cooling → closed freshwater loop → marine heat exchanger → data center.
This allows high-density liquid-cooled computing equipment to remain isolated from salt water while using the ocean as a large heat-rejection resource.
Illustrative cases only. Required seawater flow depends on heat load, allowable temperature rise, seasonal ocean temperature, heat-exchanger approach temperature, pumping head and system efficiency.
Why a Dual-Use System Could Matter
Cooling Energy
When ocean temperature is favorable, seawater heat rejection may reduce dependence on compressor-based refrigeration. Any savings must be evaluated against offshore pumping energy and system losses.
Consumptive Water Use
A marine heat-exchange system can reject heat without the evaporative water consumption associated with conventional cooling towers.
Managed Lagoon Exchange
If scientifically justified, controlled ocean-water flow could potentially influence circulation, residence time, salinity, dissolved oxygen, temperature and nutrient cycling in selected lagoon compartments.
Treasure Coast Innovation
The region could become a national demonstration site at the intersection of AI infrastructure, energy efficiency, coastal restoration, ocean engineering and public-private research.
Rather than asking only, “What does it cost to pump seawater into the lagoon?”, the more useful question may be: What is the incremental cost of obtaining an environmental benefit from seawater infrastructure that is already producing economically valuable cooling?
Scientific Foundation: Florida Tech Restore Lagoon Inflow Research
This concept does not begin from zero. Florida Institute of Technology has already completed a multi-phase, State of Florida-supported research program examining enhanced seawater exchange between the Atlantic Ocean and the Indian River Lagoon.
Florida Tech's Restore Lagoon Inflow (RLI) project has examined lagoon hydrodynamics, water quality, biology, geochemistry, engineering and the feasibility of a temporary controlled ocean-inflow system. Phase 3 advanced pilot design and permitting.
The RLI work builds on decades of Florida Tech research into Indian River Lagoon circulation, inlet hydrodynamics, water quality, and coastal engineering.
Visit the Florida Tech IRL Research Institute →
Read the RLI FAQ →
Open the Phase 3 Final Report (PDF) →
Open the Phase 1 Full Report (PDF) →
Questions That Must Be Answered
Ocean Engineering
- What offshore depth provides useful year-round temperatures?
- What pipe diameter, length and pumping head are required?
- How should intakes be screened to reduce organism entrainment?
- Can the system survive hurricanes, currents, waves and marine growth?
Data-Center Engineering
- What percentage of annual heat rejection can seawater economically carry?
- How does it integrate with high-density liquid-cooled GPU systems?
- What conventional backup cooling remains necessary?
- What is the net reduction in cooling power after pumping losses?
Lagoon & Environmental Science
- Where, if anywhere, should the seawater be returned?
- Would salinity, temperature and dissolved-oxygen changes be beneficial?
- Should flow vary with season and lagoon conditions?
- What biological, sediment or thermal impacts must be avoided?
Economics & Public Policy
- What portion of infrastructure is justified by cooling economics alone?
- What is the incremental cost of adding a lagoon benefit?
- Could a public-private demonstration reduce technical risk?
- What federal, state, university and industry roles are appropriate?
A Practical First Step
No major construction project is proposed at this stage. OSDC recommends first evaluating whether the concept is technically, economically and environmentally worth pursuing.
Treasure Coast Dual-Use Marine Cooling Feasibility Study
A focused study could examine 10-MW, 25-MW and 50-MW demonstration cases and include:
- Fort Pierce offshore bathymetry and seasonal temperature profiles;
- conceptual intake and discharge locations;
- pipeline diameter, pumping head and pumping-power requirements;
- heat-exchanger and data-center cooling integration;
- annual energy and operating-cost modeling;
- hydrodynamic and water-quality modeling of potential lagoon exchange;
- comparison with Florida Tech Restore Lagoon Inflow results;
- environmental and permitting requirements;
- capital and operating cost ranges; and
- identification of a suitable public-private demonstration site.
The opportunity is to connect two infrastructure problems before either is designed in isolation.
The Treasure Coast has a major coastal estuary requiring continued restoration and the prospect of very large new computing loads requiring continuous heat rejection. A modest feasibility study can determine whether combining those needs creates value.
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