Illustrative c5 dewpoint clamp
22.0 °C command at the assumed dew-point reservemodeled
| Value kind | modeled — Interpret this value according to its displayed kind, scope, source, and as-of date. |
|---|---|
| Scope | Assume a local dew-point indication of 20.0 °C, combined dew-point uncertainty/spatial allowance 0.5 K, coolant-sensor uncertainty 0.2 K, possible control undershoot 0.8 K and an owner reserve 0.5 K. These teaching allowances exercise the uncertainty and transient mechanisms described here; they are not a universal 2 K rule. |
| 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 | Minimum commanded supply = 20.0 + 0.5 + 0.2 + 0.8 + 0.5 = 22.0 °C. With that command the budget closes. If the local dew point rises while the command remains 22.0 °C, the crossover is 20.0 °C; above it the stated reserve fails, so raise the permitted command or invoke the qualified fallback before exposing colder surfaces. Verify the coldest surface and startup state, not only the CDU sensor. ASHRAE environmental guidance provides condensation context; the fluid/equipment envelope remains in 5.7 and installed tests in 13.5 . |
| Review | checking…cadence-derived review 2027-01-03 · standard cadence |
| Recorded changes | none recorded |
| Claim id | p5-c5-dewpoint-clamp |
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.