Illustrative series plate margin
2.82 K second-component margin in the series casemodeled
| Value kind | modeled — Interpret this value according to its displayed kind, scope, source, and as-of date. |
|---|---|
| Scope | Assume two identical 1.00 kW components, water at 35.0 °C, 2.00 L/min through each plate, density 1.00 kg/L, specific heat 4.18 kJ/(kg·K), combined junction-to-inlet resistance 0.0400 K/W at that flow, and 20.0 kPa loss per plate. Each junction limit is 85.0 °C with 5.0 K reserve. Connecting-pipe loss is excluded to isolate the topology choice. These are teaching inputs bounded by the thermal method in 5.1 and the selected plate curve that procurement must obtain. |
| 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 | Parallel routing needs 4.00 L/min at 20.0 kPa plate-path loss. Both junctions are 35.0 + 1,000 × 0.0400 = 75.0 °C, retaining 10.0 K. Series needs 2.00 L/min at 40.0 kPa; the first plate raises water temperature by 1.00 × 60/(2.00 × 4.18) = 7.18 K, so the second junction is 82.2 °C and retains only 2.82 K. Choose parallel to preserve the required reserve. Ideal plate-only hydraulic power is 1.33 W in either arrangement; pump efficiency and external losses decide electrical input. The series choice reverses at supply ≤85.0 − 5.0 − 40.0 − 7.18 = 32.8 °C, calculated without intermediate rounding. Colder supply spends rejection opportunity to avoid extra header flow. Alternatively, qualify a different component/plate duty. OCP’s cold-plate method keeps the coolant-inlet reference explicit; use 5.1 for the thermal method and 5.13 for the complete hydraulic selection. |
| Review | checking…cadence-derived review 2027-01-03 · standard cadence |
| Recorded changes | none recorded |
| Claim id | p5-series-plate-margin |
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.