Bimetallic tube in a heat exchanger of an ice making machine

A whip rod heat exchanger comprising:

• a heat exchanger being adapted to chill a feed solution to form a crystallized solid-liquid mixture of the feed solution;
• and
• at least one heat exchanger tube in the heat exchanger having a bore to contain the feed solution therein and at least one whip rod having relative motion with the heat exchanger tube whereby the whip rod distributes feed solution within the heat exchanger tube, the inner diameter surface of the heat exchanger tube being covered with an inner cladding, the inner cladding having a material composition different from a material composition of the tube, the inner cladding substantially covering the inner diameter surface of the tube whereby the inner cladding is in contact with the feed solution and defines a path of solution flow through the tube.

A method for increasing the capacity of an ice making machine wherein the ice making machine has a heat exchanger with a heat exchanger tube, an ice slurry mixture flows in the heat exchanger tube and refrigerant is circulated in a chamber in the heat exchanger, the heat exchanger tube has an inlet and an outlet and means for moving the ice slurry mixture in the tube between the inlet and the outlet, the method comprising:

• providing the heat exchanger tube with an inner portion of the heat exchanger tube formed from a first material composition and an outer portion of the heat exchanger tube formed from a second material composition, the first material composition being different from the second material composition whereby the inner and outer portions of the tube are joined such that the thermal resistance between the inner and outer portions is minimized and the inner portion limits the ice slurry mixture from adhering to the heat exchanger tube.