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This is the core component in modern, high-efficiency ice makers (especially block ice makers and plate ice makers), acting as the evaporator. Its performance directly determines ice-making efficiency and ice quality.
The coaxial heat exchanger in an ice maker is a high-efficiency evaporator specifically designed for ice makers. It employs a "tube-within-a-tube" structure, where the refrigerant flows and evaporates, absorbing heat, within the annular space between the inner and outer tubes, while the water used for ice making flows within the central tube and is cooled into ice.
Because its shape is typically coiled into a spiral or flat plate, it is often directly referred to as the evaporator or ice core of an ice maker.
Key Features and Advantages
- Extremely High Icing Efficiency: Water flows in a thin film within the central tube, resulting in a large contact area with the cold wall, low thermal resistance, extremely high heat exchange efficiency, and rapid freezing.
- The refrigerant in the annular flow channel forms an efficient counter-current or cross-flow heat exchange with the water flow direction.
- Producing High-Quality Ice: Because the freezing process progresses from the tube wall to the center, the water flow pushes dissolved air and some impurities towards the center, which are eventually discharged with the unfrozen water. This results in crystal-clear ice with high hardness (commonly known as "dry ice") and low air content.
- Compact Structure and High Adaptability: The spiral coil design allows for a large heat exchange area within a limited space, making it ideal for the compact design of ice makers.
- Controllable Ice Thickness: The freezing cycle can be precisely controlled via temperature sensors or time control, producing ice of uniform thickness.
- High Reliability and Long Lifespan: The all-copper structure has excellent thermal conductivity and corrosion resistance. The robust mechanical structure can withstand cyclic thermal expansion and contraction.
Application and Working Process in Ice Makers
It is the core of continuous ice makers (such as cube ice makers and block ice makers):
Installation Location: Installed vertically or at an angle inside the ice maker.
Ice Making Cycle: As described above, a water pump circulates water, refrigerant evaporates on the outside, and ice forms inside.
Ice Retrieval Cycle: The refrigerant flow is switched via a four-way reversing valve, hot refrigerant is injected, and the ice cylinder is detached.
Ice Formation: Primarily produces hollow cylindrical ice cylinders, which are then cut into small ice cubes of the required size using ice cutters.
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