In power plant contexts, which equipment serves as an indirect contact heat exchanger such as steam condensers and feedwater heaters?

In power plant contexts, which equipment serves as an indirect contact heat exchanger such as steam condensers and feedwater heaters?

• A. Indirect Contact
• B. Direct Contact
• C. Plate and Frame
• D. Crossflow

Answer: (A)

Indirect heat transfer with separation is what powers condensers and feedwater heaters in a power plant. These devices transfer heat from one fluid to another without letting the streams mix, using a solid barrier such as tubes or plates. That barrier keeps the steam and the cooling water (or feedwater) separate, which is essential to maintain fluid purity and control chemistry while still recovering heat to raise the feedwater temperature or condense the exhaust steam. Direct contact would mean mixing the fluids, which isn’t acceptable for these applications because it would contaminate the water or steam and disrupt system chemistry. Plate and frame and crossflow describe specific designs or flow arrangements of heat exchangers, but the situation described—steam condensers and feedwater heaters performing heat transfer without mixing—falls under indirect contact heat exchangers.

Indirect heat transfer with separation is what powers condensers and feedwater heaters in a power plant. These devices transfer heat from one fluid to another without letting the streams mix, using a solid barrier such as tubes or plates. That barrier keeps the steam and the cooling water (or feedwater) separate, which is essential to maintain fluid purity and control chemistry while still recovering heat to raise the feedwater temperature or condense the exhaust steam. Direct contact would mean mixing the fluids, which isn’t acceptable for these applications because it would contaminate the water or steam and disrupt system chemistry. Plate and frame and crossflow describe specific designs or flow arrangements of heat exchangers, but the situation described—steam condensers and feedwater heaters performing heat transfer without mixing—falls under indirect contact heat exchangers.