Marine R744 CO2 refrigerant systems use carbon dioxide as an eco-friendly, non-toxic refrigerant for maritime applications. These systems are energy-efficient and comply with stringent environmental regulations. They are ideal for reducing greenhouse gas emissions in marine refrigeration.

Key specifications and technical properties of Marine R744 (CO2) Refrigerant and Refrigeration Systems:

- **Refrigerant Type**: R744 (Carbon Dioxide, CO2)

- **Grade**: Industrial/Commercial (99.9% purity or higher)

- **Operating Pressure**: High-pressure system (up to 100+ bar in transcritical cycles)

- **Temperature Range**: -50°C to +150°C (depending on system design)

- **Viscosity**: Low (gas phase ~0.015 mPa·s at 25°C, liquid phase ~0.07 mPa·s at 0°C)

- **Buoyancy**: Heavier than air (density ~1.98 kg/m³ at 0°C)

- **Material Compatibility**: Compatible with stainless steel, carbon steel (with proper coatings), and some polymers (PTFE, PEEK)

- **System Size**: Compact due to high efficiency, but requires robust components for high-pressure operation

- **Environmental Impact**: GWP = 1, ODP = 0 (fully eco-friendly)

- **Flammability**: Non-flammable (ASME/ASHRAE Class A1 safety rating)

- **Thermal Conductivity**: High (0.0146 W/m·K at 0°C, gas phase)

- **Critical Point**: 31.1°C, 73.8 bar (transcritical operation above this point)

- **Marine Application**: Suitable for low-temperature refrigeration, heat pumps, and cascade systems