Views: 0 Author: Site Editor Publish Time: 2026-10-19 Origin: Site
At CSTHEATEXCHANGER, we design and manufacture specialized compact dry coolers engineered specifically for single-phase and two-phase server immersion cooling tanks and high-density liquid compute pods. Immersion cooling submerges high-performance server motherboards, GPUs, and ASICs directly into synthetic hydrocarbon or fluorochemical dielectric fluids, capturing 100% of generated heat directly within the liquid. Storing and pumping dielectric fluids introduces unique thermodynamic challenges: higher viscosity than water, lower specific heat capacity, and elevated tank exit temperatures (typically 45°C to 55°C). CSTHEATEXCHANGER immersion cooling dry coolers provide customized hydraulic circuits, optimized tube pass geometries, and tight approach temperatures, rejecting heat directly to ambient air with near-zero energy consumption.
Direct liquid immersion cooling achieves superior thermal transfer compared to air cooling because dielectric fluids possess significantly higher thermal capacitance than air. However, rejecting heat from dielectric fluids or secondary water-glycol loops through an outdoor dry cooler requires specialized engineering:
Higher Fluid Viscosity & Laminar Flow Regimes: Synthetic hydrocarbon dielectric fluids have kinematic viscosities significantly higher than water at operating temperatures. In conventional heat exchangers, high viscosity causes laminar flow with low internal heat transfer coefficients and high pumping pressure drops.
Lower Specific Heat Capacity: Dielectric fluids have specific heat capacities approximately half that of water (cp≈1.8 to 2.2 kJ/kg⋅Kcp≈1.8 to 2.2 kJ/kg⋅K vs. 4.18 kJ/kg⋅K4.18 kJ/kg⋅K for water). Consequently, achieving equivalent thermal rejection requires precise flow balancing and multi-pass hydraulic optimization.
Elevated Supply Temperatures (High Free-Cooling Potential): Immersion tanks operate with warm fluid discharge temperatures (45°C to 55°C). This allows the outdoor dry cooler to operate with a wide temperature differential (ΔTΔT) above ambient air, enabling 100% year-round free cooling even in hot summer climates.
At CSTHEATEXCHANGER, we engineer our immersion dry coolers to match the exact thermophysical properties of modern dielectric fluids:
Customized Internal Hydraulic Turbulators: We integrate internally grooved or enhanced tubes designed to break the boundary layer of viscous dielectric fluids, promoting turbulent mixing and boosting internal heat transfer coefficients by up to 35%.
Direct Primary or Secondary Loop Configurations:
Direct Dielectric Loop: Sealed dry coolers compatible with dielectric hydrocarbons and fluorochemicals, circulating fluid directly between the tank and outdoor cooler.
Secondary Loop (via Brazed Plate Exchanger): Compact dry coolers circulating water-glycol to an indoor plate heat exchanger that interfaces with the immersion tank.
High-Efficiency Variable-Speed EC Fans: Modulating EC fans continuously track immersion tank supply temperature targets (e.g., maintaining fluid return precisely at 40°C), minimizing parasitic electrical consumption and operating noise.
Zero Water Consumption & High Reliability: Closed-circuit operation eliminates water usage, evaporative scaling, and environmental discharge requirements, achieving ultra-low facility PUE (<1.05).
Thermal Capacity Range: 20 kW to 500 kW per modular dry cooler frame.
Fluid Compatibility: Synthetic Hydrocarbons (PAO), Fluorochemicals, Propylene Glycol, and Treated Water.
Core Metallurgy: High-conductivity Copper or Stainless Steel tubes with heavy-gauge aluminum fins.
Fluid Working Pressure: Rated up to 1.6 MPa (16 bar).
Control System: Integrated PLC with temperature feedback loops and BMS network connectivity.
Yes. Because immersion cooling tanks operate with elevated fluid temperatures (45°C to 55°C), the temperature difference between the fluid and outdoor ambient air is large enough that CSTHEATEXCHANGER dry coolers provide 100% free cooling year-round, even when ambient temperatures reach 38°C–40°C.
Yes. All internal tubing, gasketing, and header manifolds are constructed from inert, non-reactive materials (copper, stainless steel, fluoropolymer seals) that will not leach plasticizers or contaminate sensitive dielectric fluids.
Contact CSTHEATEXCHANGER today for customized thermal modeling, fluid pressure drop analysis, and factory-direct equipment quotations.
Website: https://www.cstheatexchanger.com/
Technical Inquiries: info@cstheatexchanger.com
