Strategic Roadmap for 1.5 GW Sovereign Cloud Infrastructure in Saudi Arabia: A Comparative Study of Cooling Architectures

Dear Editor-in-Chief,

I am pleased to submit the original research manuscript titled "Strategic Roadmap for 1.5 GW Sovereign Cloud Infrastructure in Saudi Arabia: A Comparative Study of Cooling Architectures" for consideration for publication in an IEEE Computer Society journal.

Research Significance

Saudi Arabia's 2030 mandate for 1.5 GW of IT load capacity presents a critical challenge: deploying hyperscale infrastructure in an extreme arid climate (>45°C ambient temperature) with severe water scarcity. This paper provides the first comprehensive comparative analysis of three cooling architectures tailored to these constraints.

Key Contributions

This manuscript provides three significant contributions to the field:

1. Comprehensive Thermodynamic Analysis: A rigorous comparative evaluation of three distinct cooling architectures — direct-to-chip liquid cooling (Architecture A), evaporative hybrid systems (Architecture B), and zero-liquid-discharge immersion cooling (Architecture C) — using validated CFD simulations and TMY3 climate data specific to Riyadh, Saudi Arabia.
2. Quantitative Performance Benchmarking: Detailed PUE and WUE metrics demonstrate that Architecture C (immersion cooling) is the only pathway to achieving PUE below 1.10 and near-zero WUE (<0.05 L/kWh) in extreme arid environments, with 85% water reduction and 23% energy savings compared to traditional approaches.
3. Economic and Strategic Framework: A 10-year total cost of ownership (TCO) analysis incorporating water scarcity premiums, carbon pricing scenarios, and high-density AI workload requirements, with practical deployment recommendations for infrastructure planners in water-constrained regions globally.