In the field of food freezing, fluidized freezing machines have become efficient freezing equipment for seafood, fruits and vegetables, and processed foods due to their ability to suspend and freeze materials through forced cold air. However, the problem of frosting on the surface of the evaporator has always been a pain point in the industry:
• Efficiency loss: Frost layer hinders heat exchange between refrigerant and air, resulting in a 15% -30% extension of freezing time;
• Energy consumption surge: In order to maintain the target temperature, the compressor needs to operate at an overclocking rate, indirectly increasing electricity costs by 30% -50%;
• Equipment risk: Excessive frost layer may block the air duct and even cause imbalance of the fan impeller, resulting in mechanical failure.
In response to these issues, fluidized freezing machines with ADF (Automatic Defrosting Function) automatic defrosting systems have emerged. Through intelligent control and structural optimization, while ensuring freezing quality, the equipment operation and maintenance efficiency has been improved to a new level.
The principle and core components of ADF system
1. Intelligent defrosting technology logic
Traditional manual defrosting relies on empirical judgment and is prone to problems such as excessive defrosting or incomplete defrosting. The ADF system achieves precise defrosting through multi parameter linkage control:
• Frost detection module: equipped with temperature and humidity sensors and pressure transmitters, real-time monitoring of the temperature gradient on the evaporator surface and changes in air duct resistance;
• Intelligent decision-making algorithm: Set frost warning threshold (such as evaporator surface temperature difference>5 ℃ or wind speed dropping to 80% of rated value), automatically trigger defrosting program;
• Staged defrosting process:
• Preheating stage: Close the evaporator supply valve, activate the hot gas bypass valve, and use the compressor exhaust to heat the evaporator surface;
• Melting stage: After 15-20 seconds, stop the hot air supply and use gravity and flow channels to discharge the defrosting water;
• Reset phase: The system automatically restarts the refrigeration cycle to ensure that the downtime is less than 3 minutes, avoiding any impact on production continuity.
2. Core hardware composition
• Hot gas bypass defrosting system: using high-temperature gas from the compressor outlet as a heat source to avoid energy consumption of additional heating elements;
• Diversion and drainage structure: A V-shaped diversion groove is installed at the bottom of the evaporator, combined with an automatic drainage valve, to achieve no residual drainage;
• Anti drip design: The top evaporator is installed at an angle to prevent defrosting water from flowing back and contaminating the material.
Technical advantages and practical application effects
1. Energy consumption optimization and cost savings
• Energy consumption reduction
• Production increase
2. Equipment lifespan and safety improvement
• Fan protection: intelligent defrosting to avoid air duct blockage
• Stable refrigerant system: reduces the risk of refrigerant leakage caused by frequent manual defrosting.
3. Quality consistency assurance
In the scenario of fruit and vegetable freezing, the ADF system maintains a stable evaporator heat transfer efficiency, controlling the temperature fluctuation range of the material center within ± 1 ℃, which is significantly better than the ± 3 ℃ of traditional equipment.
Typical application scenario expansion
• Deep processing of seafood: The freezing time of salmon slices has been reduced from 90 minutes to 65 minutes, and the water retention rate of the meat has been improved;
• Vegetable freshness preservation: After fluidized freezing, broccoli retains 90% of vitamin C, far exceeding the 70% retention rate of conventional freezing;
• Quick freezing of dairy products: Ice cream pre mixed ingredients are uniformly frozen in an environment of -35 ℃ to avoid particle agglomeration problems.
The fluidized freezing machine with ADF system not only solves the efficiency and safety problems caused by frosting in traditional equipment, but also achieves precise operation and maintenance throughout the entire life cycle of the equipment through intelligent control.
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