КОМПЛЕКСНЕ ОЦІНЮВАННЯ СИСТЕМ УЛЬТРАФІОЛЕТОВОГО ЗНЕЗАРАЖЕННЯ З УРАХУВАННЯМ КОЕФІЦІЄНТІВ ТЕХНІЧНОГО ОБСЛУГОВУВАННЯ, СПЕКТРАЛЬНИХ ТА ЕКСПЛУАТАЦІЙНИХ ПАРАМЕТРІВ

The paper presents a comprehensive evaluation of ultraviolet (UV) disinfection systems by integrating maintenance, spectral, and operational coefficients into a unified analytical model. The study addresses the progressive decline in UV radiation efficiency caused by lamp aging, surface contamination, and changes in the reflective properties of operating environments. The proposed methodology extends the classical Maintenance Factor (MF) model defined in CIE standards by incorporating additional coefficients that account for spectral effectiveness (SEF), temperature influence (TCF), ballast performance (BF), irradiation geometry (UF), and dose compliance (DCF). Experimental data obtained for various UV systems (TUV15WG13, HNS15G13, TUV36WG13, ZW20D15Y, ZW20D15W) demonstrated that overall system efficiency decreases to 27–36 % of the initial level after 6,000 operating hours. The dominant loss factors were identified as UF (17–38 %), RFMF (20–35 %), and LMF (18–28 %), while RSMF, TCF, and BF contributed minor yet consistent effects. The developed integrated approach provides a more accurate prediction of degradation processes, allowing preventive maintenance scheduling, optimization of energy consumption, and stable disinfection efficiency throughout the service life of UV systems.