Our Supercritical CO2 Coaxial Heat Exchanger is a high-performance thermal solution engineered for the most demanding transcritical CO₂ (R744) cycles. Specifically optimized for gas cooler, chiller, and low-temperature evaporator applications, these heavy-duty units provide exceptional safety margins and thermal efficiency within a compact, space-saving coaxial architecture.
Quick Technical Specifications
- • Max Working Pressure: 12.0 MPa (120 Bar) / Test Pressure up to 18.0 MPa
- • Refrigerant Compatibility: Supercritical CO₂ (R744), R290, R32, R410A
- • Configuration Options: Single Continuous Coils or Multi-Coil Parallel Racks / Bundles
- • Inner Tube Material: Cupronickel (Copper-Nickel B10/B30), 316L Stainless Steel, or Pure Titanium
Key Features & Engineering Advantages
- Extreme Pressure Integrity: Engineered and certified to sustain continuous working pressures up to 12.0 MPa (120 Bar). This exceptional pressure rating guarantees an uncompromising safety margin against the severe pressure fluctuations inherent in transcritical CO₂ gas cooling phases.
- Fully Customizable Material Palette: We provide true OEM design flexibility. Depending on your water quality and environmental aggressiveness, engineers can specify internal tube configurations: Cupronickel (CuNi) for marine/sea-water resistance, Stainless Steel (304/316L) for food-grade processing purity, or Titanium for extreme industrial chemical applications.
- Optimized Spiral-Grooved Geometry: The internal tube features a precision-engineered fluted spiral profile. This profile induces controlled fluid turbulence, which dramatically maximizes the heat transfer coefficient while precisely managing the allowable pressure drop on both the refrigerant and water sides.
- Superior Anti-Fouling & Reliability: Featuring a continuous, weld-free inner tube flow path, the coaxial design naturally resists mineral scaling, crystalline fouling, and sediment buildup. This ensures consistent lifetime thermal performance and significantly longer maintenance intervals compared to traditional plate-type exchangers.
Physical Dynamics in sCO₂ Environments
The operational excellence of our sCO₂ coaxial series leverages the unique thermophysical properties of carbon dioxide above its critical point (31.1°C, 7.38 MPa). In this supercritical zone, CO₂ exhibits the high density of a liquid combined with the high diffusivity and low viscosity of a gas.
Our enhanced corrugated tube layout is dynamically simulated to handle these single-phase gas-cooling characteristics, eliminating the sudden thermal resistance spikes typically found in traditional phase-change transitions and ensuring stable heat rejection.
Why Custom Material Engineering is Critical?
In ultra-high-pressure sCO₂ loops, the durability of the heat exchange interface is paramount. By supplying Cupronickel (CuNi), we deliver a component with substantially higher mechanical tensile strength and erosion-corrosion resistance than standard copper.
For projects operating under harsh conditions—such as maritime transport refrigeration, commercial eco-friendly heat pump water heaters, or heavy industrial racks—our capability to configure heavy-wall Stainless Steel or Titanium shells ensures the heat exchanger remains the most reliable component in your system layout.
Comprehensive Application Versatility
Our customizable coaxial solutions are the preferred choice for a wide spectrum of CO₂-based technologies:
- Commercial sCO₂ Heat Pump Water Heaters (Air-to-Water / Water-to-Water)
- Industrial Transcritical CO₂ Refrigeration Racks & Supermarket Packs
- Specialized Environmental Control Units (ECU) & Cryogenic Chillers
The inherent frost-tolerant structure of the coaxial alignment also makes it an exceptionally safe, rupture-resistant evaporator alternative to traditional brazed plate heat exchangers (BPHE) in sub-zero applications. Every order can be custom-tailored in coil bundle height, bending diameter, and header connections to fit your exact cabinet envelope.
Rigorous Quality & Pressure Validation
Every high-pressure unit undergoes comprehensive Mass Spectrometer Helium Leak Detection and hydro-pressure burst validation to ensure full compliance with international safety codes for pressure vessels (PED/CE standards). This rigorous testing, combined with our flexible manufacturing, allows HVAC/R engineers to specify our hardware with absolute operational confidence.
Request a Quote & Technical Support
Fast Download: Get precise thermal calculations and dimensions for your project.
Download Coaxial Selection Data Sheet & DrawingsReady for a tailored solution? Send your precise thermal parameters (kW, max pressure drop, target footprint dimensions) or drawings directly to our engineering team at sales@kakhvacr.com.
Frequently Asked Questions (FAQ)
Q: What certifications do your sCO₂ heat exchangers hold?
A: Our high-pressure components are engineered in compliance with international safety directives. We provide full Pressure Equipment Directive (PED) and CE documentation for European markets, and all raw materials strictly adhere to RoHS and REACH environmental directives.
Q: Can you manufacture multi-coil parallel rack bundles for large commercial capacities?
A: Yes, absolutely. Beyond individual coils, we specialize in engineering manifold-connected multi-coil racks (as per industrial chiller/heat pump requirements) to scale up heat exchange capacity while maintaining a compact footprint.
Q: Is the 12.0 MPa design pressure individually verified?
A: Yes. Every single production unit undergoes rigorous high-pressure testing at a mandatory multiplier pressure before factory clearance to guarantee zero leakage and absolute structural safety in transcritical R744 cycles.
Q: How do I choose the right model for my system?
A: Proper selection depends on your Heat Load (kW), Water Flow Rate (m³/h), and required Inlet/Outlet Temperatures. We provide a comprehensive Selection Table for capacities. Simply provide your system’s thermal requirements, and our engineers will calculate the optimal coil size and pressure drop for you.
Q: Can you provide custom materials for corrosive environments?
A: Yes, absolutely. Beyond standard copper, we specialize in Custom Material OEM. You can choose Cupronickel (Copper-Nickel/CuNi) for seawater resistance, Stainless Steel for food-grade systems, or Titanium for extreme industrial chemical applications.