Construction details of special brazed plate exchangers for CO2 refrigeration

What makes brazed plate heat exchangers for CO2 refrigeration applications that special? At first glance, looking at them they really seem similar to traditional brazed plate exchangers.

Differences start getting clear while handling them, and these are due to special construction processes. In fact, the weight is different, because of the special brazing processes employed that allow these exchangers to stand working conditions with high pressure levels up to 140 bar, which are involved in refrigeration applications using CO2 as a refrigerant. Therefore, really quite remarkable pressure levels.

Another difference is related to the connections, that from the outside are looking very much alike traditional outer threaded connections. But watching more closely, we can see there is also an inner part, which is a threaded solder connection. These are combi type connections, meaning they offer a combination of connections with the outer threading that can be employed for water or non freezing solutions, while the inner part is a threaded solder connection with standard diameters usually employed in refrigeration related applications.

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