Analysis of Working Principle and Advantages of Electric Defrosting Air Coolers (Evaporators)

Basic Structure and Working Principle

• The heat exchange part adopts a structure of copper tubes with aluminum fins sleeved outside, which makes the copper tubes and fins fit closely, reduces contact thermal resistance, improves thermal conductivity, and maximizes the heat exchange effect.conductivity, and maximizes the heat exchange effect.

• During electric defrosting, the electric heating tubes transfer heat to the evaporator (air cooler) to melt frost or ice. The frost on the evaporator (air cooler) coils and fins melts into water, which then drips into the drain pan. The electric heating tubes in the drain pan heat and evaporate the water. The operation of the electric heating tubes is generally controlled by the electronic defrosting control of the electric box. For electric defrosting, the most important things are the defrosting cycle and time setting.

Types of YSHT Electric Defrosting Air Coolers (Evaporators) and Their Applications in Cold Storage

YSHT electric defrosting air coolers (evaporators) are matched with refrigeration Compressorunits for cooling in various cold storages. They are mainly divided into low-temperature, medium-temperature, and high-temperature types to adapt to different storage temperature requirements.

• High-temperature air coolers (evaporators) (L) are suitable for fresh-keeping warehouses at around 0°C.

• Medium-temperature air coolers (evaporators) (D) are suitable for refrigerated warehouses at around -18°C.

• Low-temperature air coolers (evaporators) (J) are suitable for quick-freezing warehouses below -25°C.

YSHT electric defrosting air coolers (evaporators) have multiple series, which are customized for different refrigeration needs:

1. HT-D Series: Electric defrosting ceiling-mounted air coolers (evaporators). The fans use external rotor motors, which have low noise and high efficiency. Axial flow fans and long-range air hoods are optional. They are easy to install and have a good defrosting effect.

2.  HT-D-S/D-X Series: Electric defrosting ceiling-mounted double-side air outlet air coolers (evaporators)/ceiling-mounted inclined side air outlet air coolers (evaporators), which can be configured according to needs.

What Are the Advantages of Electric Defrosting Air Coolers (Evaporators)?

Compared with other methods for defrosting evaporator (air cooler) coils in refrigeration systems, electric defrosting systems have various advantages. These advantages stem from the efficiency, control, and reliability of electric defrosting systems in removing ice accumulation and maintaining optimal system performance. The main advantages of electric defrosting are as follows:

1. High efficiency: Electric defrosting systems can efficiently melt the accumulated water on the evaporator (air cooler) coils, ensuring quick deicing without excessive energy consumption. The electric heating elements used in these systems generate heat directly in the coils, providing effective and uniform heating over the entire surface area. Compared with other methods such as hot gas defrosting or non-circulating defrosting, this results in faster defrosting time.

2. Energy-saving: Electric defrosting systems are energy-saving because they consume electricity only during the defrosting cycle when the heating elements are activated. Unlike hot gas defrosting systems that need to transfer refrigerant from the compressor to heat the coils, electric defrosting systems do not introduce additional load into the refrigeration cycle. In the long run, this can reduce energy consumption and operating costs.

3. Precise control: Electric defrosting systems can precisely control the defrosting process, allowing customization of defrosting cycle parameters such as frequency, duration, and temperature. Advanced control algorithms and sensors can be integrated into electric defrosting systems, which can optimize the defrosting cycle according to factors such as environmental conditions, system load, and icing. This ensures efficient deicing while minimizing energy use and system downtime.

4. Reliability: Electric defrosting systems are known for their reliability and consistent performance in melting ice accumulation on evaporator (air cooler) coils. The electric heating elements used in these systems are designed to withstand the harsh operating conditions of refrigeration and air conditioning systems, providing reliable operation over a longer service life. Unlike mechanical defrosting systems that rely on moving parts and mechanical actuators, electric defrosting systems have fewer components that may wear out or fail.

5. Flexibility:  Electric defrosting offers flexibility in installation and application as they can be easily integrated into various refrigeration and air conditioning systems. Electric heating elements can be installed directly on the evaporator (air cooler) coils or near the coils, depending on space constraints and equipment design. With proper maintenance, electric defrosting systems can provide reliable deicing while minimizing downtime and maintenance costs.

6. Environmental protection:  Electric defrosting systems do not rely on refrigerants or chemicals that may cause ozone depletion or global warming. Unlike hot gas defrosting systems that use refrigerant gas to heat the evaporator (air cooler) coils, electric defrosting systems use electricity as energy, thereby reducing environmental impact and emissions. In addition, the energy efficiency of electric defrosting systems helps reduce overall energy consumption and greenhouse gas emissions.

7. Wide application range: Suitable for small and medium-sized air coolers (evaporators) and cold storage aluminum row pipes, with simple operation and low maintenance costs.

Precautions for Using Electric Defrosting Air Coolers (Evaporators)

1. Regularly check defrosting needs: According to the actual frosting situation in the cold storage (such as frost layer thickness and frequency), reasonably set the defrosting cycle and duration to avoid increased energy consumption due to excessive defrosting or reduced heat exchange efficiency due to insufficient defrosting.

2. Ensure the normal operation of the defrosting system:

￮ Regularly check whether the electric heating tubes are in good condition, whether there is loss, aging, or poor contact, to prevent defrosting failure due to heating tube faults.

￮ Clean the defrosting drain pipe to ensure that the water generated during defrosting is discharged smoothly, avoiding water accumulation and icing that affects equipment operation or the cold storage environment.

3. Maintain the cleaning of heat exchange components:

￮ Regularly clean the dust, debris, and frost residues on the surface of the fins to keep the copper tubes and aluminum fins closely fitted, avoid increased contact thermal resistance, and ensure maximum heat exchange effect.

￮ Check whether the coils of the evaporator (air cooler) are corroded or leaking, and repair or replace them in time if problems are found.

4. Pay attention to the status of motors and electrical components:

￮ Regularly check the operating sound and temperature of the fan motor (such as external rotor motor) to ensure no abnormal vibration or overheating, and avoid motor faults affecting the refrigeration cycle.

￮ Check whether the electrical circuits are firm, and whether safety components such as high and low voltage controllers and thermal protection devices are sensitive and effective to prevent safety hazards caused by circuit faults.

5. Adapt to load control:

￮ Ensure that the air cooler (evaporator) model matches the cold storage temperature requirements (high-temperature L series, medium-temperature D series, and low-temperature J series correspond to different storage temperatures respectively) to avoid overloaded operation.

￮ When used with a refrigeration compressor unit, it is necessary to confirm that the parameters of the two are compatible to ensure the stable operation of the whole system.

6. Environment and installation maintenance:

￮ Keep the installation area of the air cooler (evaporator) well-ventilated, and avoid debris accumulation affecting heat dissipation or air outlet.

￮ Regularly check the corrosion resistance of the shell (such as galvanized and spray-painted plates), and repair in time if there is damage to extend the service life of the equipment.

7. Special maintenance for customized accessories: optional accessories (such as stainless steel shells, hydrophilic aluminum foil fins, etc.) are used, targeted maintenance should be carried out according to their material characteristics. For example, stainless steel components of the air cooler (evaporator) should avoid scratches to prevent rust.