# FreeCoolingExchanger

Config types: `"FreeCoolingExchanger"`, `"FreeCooling"`  
Source: free-cooling HX module

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## EN

### Purpose & model

Free-cooling heat exchanger between two liquid loops (e.g. tower water ↔ chilled water) without vapor-compression. Effectiveness–NTU or UA·LMTD between two single-phase streams.

```
Q = ε · C_min · (T_hot,in − T_cold,in)
```

### Residuals

Two-stream energy balances + optional ΔP per leg.

### Ports

Hot and cold in/out (4-port).

### Calibration

`z_ua` default **1.0**.

### JSON

UA, fluids, optional secondary stream params — see CLI arm.

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## FR

### But

Échangeur de **free-cooling** (liquide–liquide), sans cycle frigo.

### Calibration

Z_UA = 1 par défaut.