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Capture uncommitted solver robustness work (regularization, domain errors, linear solver lifecycle, tube DP/MSH), web workbench updates, and synced BMAD skills across IDE agent folders before starting BPHX pressure-drop. Co-authored-by: Cursor <cursoragent@cursor.com>
95 lines
2.4 KiB
Markdown
95 lines
2.4 KiB
Markdown
# Boundaries — Sources & Sinks / Frontières
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Config types: `RefrigerantSource`, `RefrigerantSink`, `BrineSource`, `BrineSink`, `AirSource`, `AirSink`
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Sources: `refrigerant_boundary.rs`, `brine_boundary.rs`, `air_boundary.rs`
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---
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## EN
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Boundary components fix **Dirichlet** conditions on one edge.
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**Source** = one outlet; **Sink** = one inlet. These are the natural place to **FIX** machine inputs (T, P, ṁ).
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### RefrigerantSource / RefrigerantSink
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```
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Source: P = P_set ; h = h(P, x) n ≈ 2
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Sink: P = P_back ; optional h if x set n ≈ 1–2
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```
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| Key | Meaning | Default |
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|-----|---------|---------|
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| `fluid` | refrigerant | primary |
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| `p_set_bar` / `p_back_bar` | pressure | ~10 bar typical |
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| `quality` | vapor quality | 1.0 source |
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### BrineSource / BrineSink (water / glycol)
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```
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Source: P, h(T), optional ṁ_set n = 2 or 3
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Sink: P_back, optional T/h, ṁ n = 1–3
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```
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| Key | Meaning | Default |
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|-----|---------|---------|
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| `fluid` | Water / MEG / … | Water |
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| `p_set_bar` / `p_back_bar` | pressure | 2 bar |
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| `t_set_c` | temperature | 12 °C (source) |
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| `concentration` | glycol mass % | 0 |
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| `m_flow_kg_s` | imposed loop flow (BOLT `Vd_fixed`) | optional |
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**Do not** combine `m_flow_kg_s` with another flow imposition on the same branch (pump curve + fixed ṁ → over-constrained).
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### AirSource / AirSink
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Psychrometric state (Magnus–Tetens style humidity + moist air enthalpy):
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```
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h ≈ 1006·T_c + W·(2.501e6 + 1860·T_c)
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Source: fix P, h(T, RH) n = 2
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```
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| Key | Meaning | Default |
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|-----|---------|---------|
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| `t_dry_c` / `t_set_c` | dry-bulb | – |
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| `rh` | relative humidity | – |
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| `p_set_bar` | pressure | ~1 bar |
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| `m_flow_kg_s` | optional mass flow | – |
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### System wiring for HX secondary
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```
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BrineSource.outlet → HX.secondary_inlet
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HX.secondary_outlet → BrineSink.inlet
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```
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Without live wiring, HX may still run in **rating** mode with scalar secondary_* on the HX itself.
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### Calibration
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Boundaries generally have **no Z-factors**. They are pure Fixed inputs / back-pressure.
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---
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## FR
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### Rôle
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Imposent les **conditions aux limites** (P, T, ṁ). C’est là qu’on **fixe** les entrées machine.
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### Eau (Brine)
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Source : P, T, ṁ optionnel. Sink : contre-pression (T sortie souvent **libre** = émergente).
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### Air
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État psychrométrique (T sèche, HR → h).
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### Câblage HX
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Source → secondary_in → secondary_out → Sink pour le mode système.
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### JSON
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Voir tableaux EN.
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