Most inefficiency comes from leakage streams (A, B, C, E, F).
Designers had to guess how much "gunk" would build up on the tubes over time. The Breakthrough: A Global Brain Trust (1962) htri heat exchanger design top
Compact and efficient, plate heat exchangers (PHEs) are notoriously difficult to model because of the proprietary chevron patterns of various manufacturers. HTRI’s utilizes specific manufacturer data to deliver accurate pressure drop and heat transfer ratings. 4 Best Practices for Top-Tier Design Most inefficiency comes from leakage streams (A, B, C, E, F)
| Warning | Meaning | Fix | |---------|---------|-----| | | Tubes may fail | Increase baffle spacing, reduce baffle cut, add tie rods | | Temperature cross | ΔTₘ too low | Use multiple shells in series or crossflow | | Low shell-side velocity | Fouling risk | Reduce baffle spacing, use smaller baffle cut (20-30%) | | LMTD correction factor (F) < 0.75 | Inefficient design | Switch to 1-2 pass or multiple shells | | Overdesign >30% | Too large / costly | Reduce area (shorten tubes, fewer tubes) | reduce baffle cut