Double-wall plate exchanger

Other types of plate-and-frame heat exchangers are double-wall-plate exchangers, welded-plate exchangers, wide-gap-plate exchangers, and brazed-plate exchangers. Each type is briefly described below. 

The problems remain in a sodium-water accident. In a near term design, a double-wall tube is introduced into the steam generator (SG) a plate type heat exchanger is proposed instead of the ordinary SG for an advanced design. This new type SG is similar to the double-wall-tube SG as comes to layer configuration both SGs have three layers sodium, gas and steam/water. Sodium and steam/water are separated by double boundaries helium gas is generally used because of its good heat conductivity. 

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