Add condition for using the same r_out and r_in for the inlet and outlet pipes...

| borefield            | Path to configuration file for borehole field design                   | —       | string         | Optional; only used for `model_type` PYGFIELD                                                                                                                                                     |

| r_b                  | Borehole radius                                                        | m       | scalar         | —                                                                                                                                                                                                 |

| pos                  | Positions of pipes in borehole                                         | —       | nested_list    | `[x;y]*` coordinates of pipes; first position(s) are of inlet pipe(s); required if `type` is UTUBE, falls back to default of `[[0,0][0,0]]` if `type` is COAXIAL                                  |

| r_out                | Outer pipe radius                                                      | m       | list           | First position(s) are of inlet pipe(s)                                                                                                                                                            |

| SDR                  | SDR value of the pipes                                                 | —       | scalar         | Determines pipe thickness                                                                                                                                                                         |

| r_out                | Outer pipe radius                                                      | m       | list           | First position(s) are of inlet pipe(s), Radii must be the same for inlet and outlet pipes respectively.                                                                                           |

| r_in                 | Inner pipe radius                                                      | m       | list           | Only used if `SDR` is not provided. First position(s) are of inlet pipe(s), Radii must be the same for inlet and outlet pipes respectively.                                                       |

| SDR                  | SDR value of the pipes                                                 | —       | scalar         | Only used if `r_in` is not provided. Determines pipe thickness through: thickness = (`r_out`*2) / `SDR`.                                                                                          |

| k_p                  | Pipe thermal conductivity                                              | W/mK    | scalar         | —                                                                                                                                                                                                 |

| nInlets              | Number of inlet pipes                                                  | —       | scalar         | Required if `type` is UTUBE, falls back to default of 1 if `type` is COAXIAL                                                                                                                      |

| insu_dr              | Fraction of pipe thickness with insulating material                    | —       | scalar         | Range: 0–1                                                                                                                                                                                        |