Which statement about the shell and tube evaporator is false?

In the context of shell and tube evaporators, the statement that brine circulates through the tubes in a direct expansion chiller is false because, in direct expansion chillers, the refrigerant itself is used to absorb heat directly within the tubes, whereas brine is typically used in other types of systems as a secondary coolant or heat transfer fluid.

Shell and tube evaporators are known for their efficient heat exchange capabilities, making them suitable for various applications, including refrigeration. They can accommodate different refrigerants, giving them flexibility in operation. Additionally, these evaporators are characterized by a high heat transfer coefficient, which is essential for effective thermal performance. The design involves tubes arranged within a shell, allowing for effective heat transfer between the refrigerant inside the tubes and the fluid outside, which enhances heat exchange efficiency.