# heating

Fortran module: `heating`

## Parameters

User-configurable parameters (can be set via `param_dict`):

| Parameter | Type | Default | Description |
|-----------|------|---------|-------------|
| `cooling_modules` | `int32[(5,)]` | `array(5,)` |  |
| `dust_gas_coupling_method` | `<class 'numpy.ndarray'>` | `3` |  |
| `heating_modules` | `int32[(9,)]` | `array(9,)` |  |
| `linecoolingarray` | `float64[(3, 7)]` | `array(3, 7)` |  |
| `linecoolingsum` | `float64[(3,)]` | `[0. 0. 0.]` |  |
| `pahabund` | `<class 'numpy.ndarray'>` | `6.000000212225132e-07` |  |
| `permutationarray` | `int32[(3,)]` | `[0 0 0]` |  |
| `se_coolant_iterations` | `int32[(7,)]` | `array(7,)` |  |
| `se_coolant_max_rel_change` | `float64[(7,)]` | `array(7,)` |  |
| `se_cpu_end` | `<class 'numpy.ndarray'>` | `0.0` |  |
| `se_cpu_start` | `<class 'numpy.ndarray'>` | `0.0` |  |

## Constants (Read-Only)

Fortran PARAMETER constants (compile-time values):

| Constant | Type | Value |
|----------|------|-------|
| `coolinglabels` | `bytes240[(5,)]` | `array(5,)` |
| `heatinglabels` | `bytes240[(9,)]` | `array(9,)` |
| `max_line_solve_attempts` | `<class 'numpy.ndarray'>` | `3` |
| `ncooling` | `<class 'numpy.ndarray'>` | `5` |
| `nheating` | `<class 'numpy.ndarray'>` | `9` |
| `nheatingterms` | `<class 'numpy.ndarray'>` | `23` |

## Internal Variables

```{dropdown} Internal solver variables (advanced)
| Variable | Type | Current Value |
|----------|------|---------------|
| `chemheating` | `<class 'numpy.ndarray'>` | `0.0` |
| `coolingvalues` | `float64[(5,)]` | `array(5,)` |
| `heatingvalues` | `float64[(9,)]` | `array(9,)` |
| `line_solver_attempts` | `<class 'numpy.ndarray'>` | `1` |
| `median_line_index` | `<class 'numpy.ndarray'>` | `1` |
```

## Runtime Access

Access `heating` parameters at runtime using `uclchem.advanced.GeneralSettings()`.
See [Accessing Fortran Parameters](index.html#accessing-fortran-parameters-at-runtime) on the main Fortran API page for examples.