HuixianTianyang Electric Co.Ltd.
Freezer Roll-bond Evaporator
2026-03-27
Roll-bond Evaporator (also known as Roll-welded Evaporator)
A highly mainstream plate-type heat exchange component in household refrigeration, especially commonly used in refrigerator cool compartments.
I. Manufacturing Process
High-purity aluminum sheets (usually over 99% pure aluminum) are selected. The designed pipeline layout is printed on one aluminum sheet using a solder-resistant coating (e.g., graphite coating).
It is laminated with another clean aluminum sheet and roll-bonded at high temperature and pressure to form a sealed composite panel.
High-pressure nitrogen is inflated into the printed pipeline channels to expand the passages and form internal refrigerant flow paths.
Inlet and outlet connectors are welded, and the component is bent into shape as required.
II. Working Principle
As a core heat exchange component in vapor-compression refrigeration systems:
Low-temperature, low-pressure liquid refrigerant enters the evaporator channels, absorbs heat inside the panel, and rapidly evaporates into gas. The panel surface exchanges heat with the air inside the cabinet to achieve cooling. The gaseous refrigerant is then drawn out and compressed by the compressor to complete the cycle.
III. Core Properties, Advantages and Disadvantages
V. Typical Applications
Household refrigerators / freezers: Back panels of cool compartments and freezer shelves in single-door and double-door direct-cool refrigerators
Small refrigeration appliances: car refrigerators, mini wine coolers
Some commercial display cabinets and small air cooler units
V. Selection and Maintenance Guidelines
Material: High-purity aluminum sheets are preferred to avoid impurities affecting heat transfer and welding quality.
Flow channel design: U-shaped / serpentine channels to balance refrigerant flow rate and heat exchange area.
Leak testing: High-pressure airtightness testing is required before delivery.
Daily maintenance: Regular defrosting for direct-cool models to prevent excessive frost from reducing heat exchange. Never scrape the evaporator surface with sharp objects.
VI. Comparison with Other Evaporators
Compared with finned-tube evaporators: Roll-bond types are thinner and flatter, ideal for embedding in cabinet back panels; finned-tube types have larger air volume and are mostly used in frost-free refrigerators.
Compared with tube-on-sheet evaporators: Roll-bond evaporators have integrated channels and panels with no contact thermal resistance, resulting in higher efficiency.
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