A 100 kW CRAH coil fed with 18 °C water sends air out at 24 °C: a 6 K approach. For 22 °C air at the same load and flows, the LMTD drops from 8.66 to 6.55 K and the coil needs about 1.3× the UA; a 2 K approach needs 2×, 1 K about 2.8×, and zero would need infinite area. The original full-lesson voice is kept in a new portrait layout.
Full lesson:
Teaching calculation: ideal counterflow, dry coil, constant properties. Real coil selection uses manufacturer performance data.
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