Decoding the Birth of the Cold Storage "Heart": From Aluminum Foil to Fins, Unveiling the Entire Intelligent Manufacturing Process of Cold Storage Evaporators
With the continued surge in demand for cold chain logistics in 2026, the total capacity of cold storage facilities nationwide is projected to exceed 265 million to 310 million cubic meters. However, regardless of the expansion of cold storage scale or the upgrading of technology, one core component consistently determines the refrigeration efficiency and energy consumption level of cold storage-the evaporator. As the "heart" of the refrigeration system, the evaporator bears the core mission of absorbing heat from the storage area and achieving a low-temperature environment. Today, we step into the production line to uncover the entire intelligent manufacturing process of cold storage evaporators, from raw materials to finished products.
What is an Evaporator? The "Heat Transporter" of Cold Storage Refrigeration
A cold storage evaporator is a type of indirect heat exchange device. Simply put, low-temperature, low-pressure liquid refrigerant vaporizes and absorbs heat on one side of the evaporator's heat transfer wall, cooling the air on the other side of the heat transfer wall. Currently, cold storage evaporators are mainly divided into two categories: one is the pipe-type evaporator, installed on the walls or ceiling of the warehouse, utilizing natural convection to cool the air, which has the advantages of uniform heat transfer and maintaining the humidity of goods; the other is the fan-type evaporator, suspended from the ceiling or side of the warehouse, achieving rapid cooling through forced ventilation by fans. Regardless of the type, efficient heat transfer is the core pursuit.
From Aluminum Foil to Fins: The Birth of the Evaporator
Modern cold storage evaporators mostly adopt a copper tube + aluminum fin or all-aluminum structure. Aluminum has a thermal conductivity as high as 210W/m·K, more than 5 times that of copper, enabling higher heat transfer efficiency with a smaller heat exchange area. Its manufacturing process mainly includes the following key steps:
Step 1: Fin Stamping and Forming-Aluminum foil is stamped at high speed using precision molds, and processed into fins through a two-stage flanging and one-time forming process. Advanced speckled fin design can improve heat transfer efficiency by more than 8% compared to flat fins.
Step 2: Coil Bending and Fin Stringing – Copper or aluminum tubes are bent into the designed shape using a tube bending machine, and then the stamped fins are strung one by one into the tube bundle. The coils are arranged in a staggered pattern to reduce air-side resistance.
Step 3: Mechanical Tube Expansion – This is the core process that determines the evaporator's performance. Through mechanical tube expansion, the fins and coils are tightly fitted together, minimizing contact thermal resistance. The quality of tube expansion directly determines the evaporator's heat exchange efficiency.
Step 4: Welding Assembly and Degreasing – The various components are welded and assembled into a complete evaporator, followed by degreasing to remove oil and oxide scale from the tubes, ensuring the cleanliness of the internal piping.
Step 5: Leak Detection – All finished products must undergo a pressure test, typically a rigorous 24-hour test at 2.0 MPa. Some newer evaporators also have dedicated leak detection ports for precise detection of internal leaks at weld joints.
Step 6: Drying and Packaging – After passing the leak detection, the tubes are dried, inspected, and finally packaged for shipment.
Green + Intelligent: Two Major Evolutionary Directions in Evaporator Technology
Against the backdrop of accelerated green and low-carbon transformation, evaporator technology is undergoing profound changes. On the one hand, the application of high-efficiency evaporators significantly improves heat exchange efficiency, and their low-frost capability effectively reduces the decline in refrigeration efficiency caused by frost. On the other hand, intelligent defrosting systems can automatically defrost based on the evaporator surface frost condition, avoiding unnecessary energy waste. Furthermore, frost monitoring technology based on multi-sensor fusion and adaptive defrosting control algorithms are enabling on-demand defrosting of evaporators, solving the pain points of low efficiency and high energy consumption in traditional defrosting methods.
In 2026, the cold storage industry has shifted from "competing on scale" to "competing on efficiency." Intelligent transformation has become the industry standard-intelligent temperature control, remote monitoring, and unmanned warehousing technologies are widely used. As a core component of cold storage refrigeration systems, the manufacturing process of evaporators is also continuously upgrading towards automation, precision, and intelligence.
From a roll of aluminum foil to a high-efficiency evaporator, every process embodies the craftsmanship of precision manufacturing. In the wave of digitalization and greening of cold chain logistics, every technological leap in the evaporator, the "heart" of cold storage, is injecting a continuous stream of "cold power" into new quality productivity.
