1. Core Refrigeration Architecture
1) Falling Film Evaporation System
The AT60 adopts a falling film ammonia evaporation design, where liquid ammonia forms a controlled thin film over the external surface of stainless steel ice tubes (304/316L).
Key engineering advantages:
Improved heat transfer efficiency due to reduced thermal resistance layer
Lower ammonia charge volume (up to ~40% reduction compared with flooded systems)
Reduced system safety risk due to smaller refrigerant inventory
This design improves both thermodynamic efficiency and operational safety in large-capacity ice production.
2) Advanced Oil Separation & Return Management
Ammonia is non-miscible with conventional lubricating oils, making oil return control critical for long-term efficiency.
The AT60 integrates a multi-stage oil separation system to ensure:
Continuous separation of compressor oil from refrigerant loop
Stable heat exchange performance of evaporator surfaces
Prevention of efficiency degradation caused by oil film accumulation
This is particularly important in continuous-operation environments where performance drift can otherwise exceed 10–15% over time.
2. Performance in High-Temperature Coastal Environments
In tropical regions such as Thailand, Indonesia, and Vietnam, where cooling water temperatures frequently exceed 30°C, ammonia systems demonstrate a clear thermodynamic advantage over conventional HFC refrigerants.
Application Performance Advantages:
Higher latent cooling stability: Tube ice maintains structural integrity during long-distance transport
Slower melt rate under load: Suitable for multi-stage cold chain distribution
Stable production in high ambient heat: Reduced efficiency drop under elevated condensing pressure conditions
3. Safety Engineering & Compliance Design
The AT60 is engineered with multi-layer safety architecture aligned with industrial refrigeration standards.
| Safety Layer | Engineering Implementation | Functional Outcome |
|---|---|---|
| Gas Detection | High-sensitivity NH₃ sensors (≈10 ppm detection threshold) | Early leak detection and alarm response |
| Electrical Protection | ATEX / IECEx-certified explosion-proof components | Eliminates ignition risks in machinery zones |
| Refrigeration Control | Gravity-fed or controlled overfeed system design | Prevents liquid slugging and compressor instability |
These systems collectively ensure stable operation in industrial environments with strict safety requirements.
4. Energy Efficiency & Lifecycle Cost Advantage
While ammonia systems require higher initial investment compared to HFC-based plants, they deliver significantly lower total cost of ownership (TCO) under continuous operation.
Energy Performance:
Ammonia system COP: ~4.5–5.0 (typical range in optimized conditions)
HFC systems in tropical climates: often ≤3.5 under high ambient load conditions
Operational Impact:
Estimated annual electricity savings: USD 25,000–40,000 (per 60 T/D plant, depending on load profile)
Lower refrigerant replenishment cost due to ammonia's low market price
Reduced long-term maintenance cost from simplified refrigerant management
5. Application Scenarios
1) Fishery & Cold Chain Logistics
Long-distance seafood transport
Port-side ice supply stations
Temperature stabilization during transshipment
2) Industrial Process Cooling
Chemical reaction temperature control
Dyeing and textile processing
Concrete and infrastructure cooling applications
3) Large-Scale Food Processing
Meat processing plants
Seafood processing facilities
Centralized ice supply hubs
6. Engineering Positioning
The CBFI AT60 represents a high-capacity ammonia tube ice production platform designed for harsh thermal environments.
Its value lies not in isolated machine performance, but in system-level optimization across:
Refrigeration thermodynamics
Safety architecture
Energy efficiency under tropical load conditions
Long-cycle industrial reliability
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