Illustrative facility-water return: 45 °C supply plus an assumed 10–20 K rise
55–65 °C (illustrative FWS return)derived
| Value kind | derived — Derived values are guide calculations; their result is only as fixed as the stated inputs, scope, and method. |
|---|---|
| Scope | Arithmetic from an assumed rise, not a W45 requirement or a measured OEM return range. The return equals supply plus load divided by mass flow times specific heat. Heat-recovery lift depends on the buyer's temperatures and exchanger approaches (Chapters 5.9 and 15.5). |
| As of | 2026-02 |
| Source | Guide calculation; boundary definitions from ANSI/ASHRAE 127-2020 Addendum b, §§3.1 and 6.4–6.5 |
| Review | checking…review by 2027-04-14 · standard cadence |
| Recorded changes | last 2026-10-14 · 2 revisions tracked |
| Claim id | warm-loop-return-temperature-usable-for |
Where the guide uses it
← Full numbers register — every date-stamped figure in the guide, with revision history.