Illustrative c5 door room duty
20.0 kW door duty; 28.7 L/minmodeled
| Value kind | modeled — Interpret this value according to its displayed kind, scope, source, and as-of date. |
|---|---|
| Scope | For one rack in 5.1, assume 20.0 kW residual air heat, 24.0 °C rack inlet and 36.0 °C exhaust. An illustrative door selection carries that duty with 20.0/30.0 °C water and 24.0 °C leaving air; use 1.00 kg/L and 4.18 kJ/(kg·K). Ignore door-fan heat in this comparison. Assume 25.0 kW spare room capacity and four identical doors. These are proposed operating points within the heat-path constraints explained here, not a manufacturer rating. |
| As of | 2026-09 |
| Source | Guide calculation from expressly assumed teaching inputs. Primary reference supplies method or equipment context, not evidence that this design was built or tested. |
| Derivation | Water flow = 20.0 × 60/(4.18 × 10.0) = 28.7 L/min. The stated cold-end difference is 24.0 − 20.0 = 4.0 K and the hot-end difference 36.0 − 30.0 = 6.0 K; the balance closes. Require the supplier airflow/static-pressure and coil selection before procuring the door. A 35.0 °C TCS supply cannot produce 24.0 °C air: at the ideal limit the crossover is 24.0 °C water, and finite area requires colder water. Keep the lower-temperature branch or carry 20.0 kW on room cooling. One lost door releases 20.0 kW, inside the assumed 25.0 kW reserve. Four lost doors release 80.0 kW and exceed it by 55.0 kW. The common failure needs another sink or a demonstrated heat reduction of at least 55.0 kW. Use the balance in 5.1 and ASHRAE heat-path guidance ; 13.5 owns the installed failure test. |
| Review | checking…cadence-derived review 2027-01-03 · standard cadence |
| Recorded changes | none recorded |
| Claim id | p5-c5-door-room-duty |
Where the guide uses it
Not quoted in a chapter yet; it is kept in the curated register.
← Full numbers register — every date-stamped figure in the guide, with revision history.