In-depth Comparison of Three Defrosting Methods for Cold Air Fan Evaporator in Cold Storage and On-site Selection Guid

I. Core Differences Among Three Frost-Resistant Types

• Water flushing defrosting: Defrosting by water immersion → Fast and clean, but water-intensive, frost-sensitive, and requires drainage
• Electrical defrosting: Heating with electric heating tubes → Simple and cost-effective, but energy-intensive and prone to significant temperature fluctuations in storage.
• Thermal fluid defrosting: Utilizing high-temperature exhaust from the compressor → Energy-efficient, clean, and stable, but with a complex system.
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II. Detailed Comparison

1) Water flushing frost

Principle: A water spray pipe is installed at the top to release water during defrosting, effectively flushing away frost.

merit

• Thawing is fastest (within minutes)
• Complete defrosting with no residual fins
• The cold air blower itself sustained almost no damage.
• Suitable for low-temperature storage with wide spacing and high frost accumulation

shortcoming

• Water supply and drainage systems must be installed, with proper slope design and floor drains within the reservoir.
• After defrosting in a low-temperature chamber, secondary icing is prone to occur, necessitating air drying.
• Moderate fluctuation in core temperature
• Water consumption, and difficulties in preventing pipe freezing during winter in northern regions

suit

• Low-temperature storage facility, quick-freezing storage facility, below-18°C, and storage facility with excessive frost accumulation
• Centralized defrosting for large cold storage facilities, logistics cold storage facilities, and multiple cold air fans
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2) Electrochemical defrosting (defrosting via electric heating tube)

Principle: Electric heating tubes are embedded within the fins, which are energized to provide heating for defrosting.

merit

• Simplest and lowest cost
• Easy to install without requiring modification of complex piping systems
• Easy to control with low failure rate
• Small cold storage and compact cold air fans are the preferred choices

shortcoming

• Most power-consuming, with high defrosting power consumption
• Slow defrosting with the greatest fluctuation in storage temperature
• High temperatures can easily damage the fins and adhesive layers.
• Incomplete defrosting may result in residual hard frost.

suit

• Small high-temperature storage room, medium-temperature storage room, small cooling fan
• Limited storage capacity, inconvenient drainage, and low budget.
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Thermal fluorine defrosting (thermal gas defrosting)

Principle: The high-temperature exhaust from the compressor is directly introduced into the evaporator, where defrosting is achieved through the refrigeration system's inherent thermal capacity.

merit

• Most energy-efficient, with minimal additional power consumption
• Minimum temperature fluctuation ensures safer cargo transportation
• The defrosting process is thorough, with no residue or moisture remaining.
• Device-friendly and long-lasting

shortcoming

• The system is the most complex, featuring numerous pipelines and valves.
• High cost and stringent installation and commissioning requirements
• The defrosting speed is slightly slower than that of water flushing.

suit

• Both medium-high temperature storage and low temperature storage can be utilized.
• High requirements for stable storage temperature: pharmaceuticals, food, precision refrigeration
• Multi-warehouse parallel automated cold storage.
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