enex_analysis.uv_treatment

UV water treatment utility functions.

Functions for UV lamp power scheduling, turbidity-based parameter lookup, and required exposure time calculation (Radial Model).

Functions

calc_uv_exposure_time(radius_cm, ...[, ...])

Calculate required UV lamp exposure time via Radial Model.

calc_uv_lamp_power(current_time_s, ...)

Calculate UV lamp power at a given time instant.

get_uv_params_from_turbidity(turbidity_ntu)

Return UV parameters from a turbidity lookup table.
enex_analysis.uv_treatment.calc_uv_lamp_power(current_time_s, period_sec, num_switching, exposure_sec, lamp_watts)[source]

Calculate UV lamp power at a given time instant.

The lamp switches on num_switching times per period_sec, each activation lasting exposure_sec.

Parameters:

  • current_time_s (float) – Current simulation time [s].

  • period_sec (float) – Switching period (e.g. 3 h → 10800 s).

  • num_switching (int) – Number of on-cycles per period.

  • exposure_sec (float) – Duration of each on-cycle [s].

  • lamp_watts (float) – Rated lamp power [W].

Returns:

Instantaneous lamp power [W] (0 or lamp_watts).

Return type:

float

enex_analysis.uv_treatment.get_uv_params_from_turbidity(turbidity_ntu)[source]

Return UV parameters from a turbidity lookup table.

Table data based on Table 1. Effect of Turbidity on UVT, UV Absorbance, UV Intensity, and Exposure Time.

Parameters:

turbidity_ntu (float) – Turbidity value [NTU].

Returns:

Keys: uv_absorbance, uv_transmittance_percent, reference_intensity_mw_cm2, reference_exposure_time_sec.

Return type:

dict

enex_analysis.uv_treatment.calc_uv_exposure_time(radius_cm, uvc_output_W, lamp_arc_length_cm, target_dose_mj_cm2=186, turbidity_ntu=0.25)[source]

Calculate required UV lamp exposure time via Radial Model.

Reference: ADA453967.pdf — Radial Model for UV disinfection.

Parameters:

  • radius_cm (float) – Tank radius (lamp-to-wall distance) [cm].

  • uvc_output_W (float) – UV-C output power of the lamp [W].

  • lamp_arc_length_cm (float) – Arc length of the lamp [cm].

  • target_dose_mj_cm2 (float) – Target germicidal dose [mJ/cm²]. Default 186 (EPA 4-log virus).

  • turbidity_ntu (float) – Water turbidity [NTU].

Returns:

Required single-exposure time [min].

Return type:

float