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evaporators using brazed heat exchangersEvaporators 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.

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
 

Copyright ® 2007 | Valutech Inc. | All Rights Reserved

Valutech Inc.
70 Esna Park Drive, Unit 3
Markham, Ontario, Canada
L3R 6E7

Tel: 905.940.0961
Fax: 905.940.0983
Email: i
nfo@valutechinc.com