What are the types of indirect contact heat exchangers?

What are the types of indirect contact heat exchangers?

• A. Shell and Tube & Plate and Frame
• B. Plate and Frame & Direct Contact
• C. Shell and Tube & Crossflow
• D. Crossflow & Parallel Flow

Answer: (A)

Indirect contact heat exchangers transfer heat without mixing the two fluids, using a solid barrier between them. The classic examples of this are shell-and-tube and plate heat exchangers (including the plate-and-frame design). In shell-and-tube, one fluid flows through tubes while the other surrounds the tubes in a shell, with heat transfer across the tube walls keeping the streams separate. Plate heat exchangers use a stack of corrugated plates that create separate channels for the fluids, again with heat transfer through metal walls and no mixing. Direct-contact heat exchangers, by contrast, involve mixing the fluids to transfer heat, which is not the case here. Flow arrangement terms like crossflow and parallel flow describe how the fluids move relative to each other, but they don’t define the type of heat exchanger itself. They can occur in indirect-contact devices, but they’re not the categories of devices that keep the streams separate. So the correct pairing reflects the two standard indirect-contact types: shell-and-tube and plate (plate-and-frame).

Indirect contact heat exchangers transfer heat without mixing the two fluids, using a solid barrier between them. The classic examples of this are shell-and-tube and plate heat exchangers (including the plate-and-frame design). In shell-and-tube, one fluid flows through tubes while the other surrounds the tubes in a shell, with heat transfer across the tube walls keeping the streams separate. Plate heat exchangers use a stack of corrugated plates that create separate channels for the fluids, again with heat transfer through metal walls and no mixing.

Direct-contact heat exchangers, by contrast, involve mixing the fluids to transfer heat, which is not the case here. Flow arrangement terms like crossflow and parallel flow describe how the fluids move relative to each other, but they don’t define the type of heat exchanger itself. They can occur in indirect-contact devices, but they’re not the categories of devices that keep the streams separate.

So the correct pairing reflects the two standard indirect-contact types: shell-and-tube and plate (plate-and-frame).