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Evaporators by Alfa Laval

Using the brazed heat exchanger as an evaporator provides a low cost alternative to the conventional shell & tube heat exchangers. Channels are formed between the corrugated plates and corner are arranged so that the two media flow through alternate channels, always in counter current flow.

We offer the AflaVap as an evaporator that will either partially or completely vaporize a liquid received from the bottom of the distillation column. With its special corrugated plate pattern to generate more turbulence, the AlfaVap provides much higher heat transfer coefficients than the conventional shell and tube evaporator.

The two phase refrigerant (vapour+liquid) enters the bottom left of the exchanger with a vapour quality depending on the operating condition of the plant. Inside the channels the evaporation of the liquid phase takes place and some degrees of superheat are always requested. The process is called "dry expansion", see the blue and arrow for the inlet and outlet ref. connections location.

The water (brine) to be cooled flows counter current in the opposite channel side, see the dark and light red arrow for the water (brine) connection location.

Advantages of using a brazed heat exchanger as an evaporator:

• Special Built in distributor allows for a more even flow performance eliminating performance fluctuations
• Lower refrigeration charge results in cost savings for the operator of the system
• The possibility of freezing is lessened with a turbulent flow with a short retention time in the heat exchanger
• Proven performance with thorough testing done at Alfa Laval's refrigeration labs in Sweden and the United States
• Large capacity ranges for evaporators from ¼-55 refrigeration tons in brazed units and higher tonnages in other types of heat exchangers
• Most units available from stock

Call us today. Tel: 905.940.0961 or by Email: info@valutechinc.com