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Alfa Laval S.p.A.

AC70-MAX

The Alfa Laval S.p.A. AC70-MAX is a brazed plate heat exchanger from Alfa Laval's AC family. The AC product line is designed primarily for air-conditioning, refrigeration, chiller and heat-pump duties and can be used as an evaporator, condenser or in other approved refrigerant heat-transfer arrangements. Its brazed plate construction provides a compact, gasket-free heat-transfer core with alternating flow channels between the connected media. On board ship, such a unit would normally be found inside packaged HVAC, refrigeration or heat-pump equipment rather than as a general-purpose shell-and-tube engine-room cooler. The AC70 designation identifies the heat-exchanger size or geometry within the AC family, but the source list provides no plate count, connection size, refrigerant or duty data for this exact unit. The MAX suffix identifies a variant of the base model in this library, but the exact technical distinction from the non-MAX version must be verified from Alfa Laval documentation for the supplied configuration. Exact performance, pressure, temperature, refrigerant compatibility and installation limits must be taken from the unit drawing, nameplate and manufacturer documentation.

Components & Design

Component data being added…

Technical Data

Model number AC70-MAX
Plate count (min) 16 plates
Plate count (max) 200 plates
Max flow rate 50.0 m3/h
Design pressure 31 bar
Application evaporator/condenser, commercial
Plate material Stainless steel (AISI 316)
Brazing material Copper
Plate count (configured) 200 plates
Effective flow rate at duty point 50.0 m3/h
Configuration MAX configuration

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Common failures & inspection points

Internal fouling or contamination on the fluid side, producing reduced heat transfer and increased pressure drop
Restricted refrigerant or liquid distribution, producing uneven temperature profiles, poor capacity or unstable system operation
Freezing or abnormal thermal stress caused by unsuitable operating conditions, producing loss of performance or possible internal damage
External corrosion, vibration damage or stressed pipe connections, producing leakage at joints or connections
Internal leakage caused by plate or braze damage, producing cross-contamination, loss of refrigerant or abnormal system pressures

Service & Maintenance

Check inlet and outlet temperatures, pressure drop and system performance for signs of fouling or maldistribution. Inspect connections, supports and adjacent pipework for vibration loads, corrosion and leakage. Because the brazed core is not opened like a gasketed plate heat exchanger, cleaning and repair options depend on the contamination type and manufacturer-approved procedures. Verify refrigerant and fluid compatibility before chemical cleaning or changing service. Use the unit nameplate and Alfa Laval documentation for exact pressure, temperature, testing and installation limits.

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Replacement Parts

There are normally few internal routine spares for a brazed plate heat exchanger because the plate pack is permanently brazed. Useful onboard spares are usually installation-specific items such as connection seals, sensors, valves or a replacement exchanger where system criticality justifies it. Any replacement unit must match the original thermal duty, connection arrangement and approved design conditions.
Equipment Model #153461 · ✓ still in production