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WHITE PAPER 5.2 Semi-welded technologies Semi-welded plate heat exchangers with gaskets are often an ideal solution for supporting the needs of: • Ammonia (R717) refrigeration systems and heat pumps, at medium-to-large capacities • Carbon dioxide (R744) evaporators • Ammonia/CO2 (R717/R744) cascade systems Semi-welded plate heat exchangers consist of a series of thin corrugated twin plates (cassettes) which are laser welded on one side and gasketed on the other side. Optimal performance will be determined by the design of your heat transfer plates, and today you can take ad- vantage of new plate developments to ensure the lowest pressure drop, such as non-circular ports and distribu- tion areas that optimize media flow. Semi-welded technologies combine the flexibility and serviceability of standard gasketed plate heat exchang- ers, while enabling reliable operation at higher design pressures. Modern designs with optimized sealing further reinforce the heat exchanger’s dependability. Semi-welded plate heat exchangers can also offer high resistance against ice formation and fatigue stresses from pressure and/or temperature variations. Depending on size, the units can handle temperature ranges from -45°C (-49°F) to 150°C (302°F) and pressure ranges from below vacuum up to what is required in an ammonia heat pump (63 bar or 900 psi). They can be specified in stainless steel (AISI304, AISI316, SMO254) or titanium, enabling the handling of a wide variety of fluids including sea water or various brines. 5.3 Fusion-bonded technologies Fusion-bonded heat exchangers are a unique technology that can work with all refrigerants, but they are especially suitable for: • R717 (ammonia) in small capacity heating, cooling and refrigeration systems • Hydrocarbons and synthetic low-GWP refrigerants with clean water or hygienic media AlfaFusion is a breakthrough fusion bonding manufactur- ing technique developed by Alfa Laval that offers a 100% stainless steel heat exchanger. It combines improved hygiene and corrosion resistance with the high efficiency and compact footprint of a brazed plate heat exchanger. Thanks to the fully stainless steel construction, these heat exchangers can be used in installations normally reserved for semi-welded and welded technologies. 13PDF Image | guide for selecting and accommodating refrigerants
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