Method for Estimating Ultraviolet Germicidal Fluence Rates in a Hospital Room

Schafer, Millie P.; Kujundzic, Elmira; Moss, C. Eugene; Miller, Shelly L.

doi:10.1086/591856

Cited by 12 publications

(9 citation statements)

References 14 publications

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“…The characteristic parameters of the UVGI and ventilation systems, and room configurations in these facilities were measured in duplicate and documented. The UVGI fluence rates were measured by actinometry and with a radiometer (Model IL 1400 A; International Light Inc., MA) . A manometer (Model 1430; Dwyer Instruments Inc., ID) was used to measure the room pressure.…”

Section: Methodsmentioning

confidence: 99%

Using Computational Fluid Dynamics Modeling to Evaluate the Design of Hospital Ultraviolet Germicidal Irradiation Systems for Inactivating Airborne Mycobacteria^†

Fisher

Miller

2013

Photochem & Photobiology

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This research was conducted to evaluate the design of hospital ultraviolet germicidal irradiation (UVGI) systems and to assess their effectiveness for inactivating airborne mycobacteria. A computational fluid dynamics (CFD) model was developed and tested by simulating previous experiments measuring the effectiveness of a lab-based UVGI system. Model testing showed reasonable agreement with experimental measurements. The model captured trends similar to the experiments: Effectiveness of an upper-room UVGI system is higher when there is no ventilation compared with when there is ventilation, and wintertime ventilation conditions can markedly decrease the performance of an upper-room UVGI system. The CFD model was then applied to evaluate the design of three hospital patient rooms. A patient and an exam room with upper-room UVGI systems, and a patient room with an exhaust duct system were studied. Results showed that one of the UVGI systems was not very effective, due to the very efficient ventilation design. The other two configurations were reasonably to very effective at inactivating airborne mycobacteria. The most effective application was the one in which the room air-exchange rate was very low. CFD modeling can be useful for assessing whether hospital UVGI installations and ventilation systems are effective for infection control.

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Section: Methodsmentioning

confidence: 99%

Using Computational Fluid Dynamics Modeling to Evaluate the Design of Hospital Ultraviolet Germicidal Irradiation Systems for Inactivating Airborne Mycobacteria^†

Fisher

Miller

2013

Photochem & Photobiology

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“…The authors found that the shadowing effect could significantly influence the FR distributions in a UV reactor, thus reducing the fluence delivered by the reactor for microorganism inactivation. Schafer et al [20] and Imoberdorf et al [8,9] used a radiometer-type detector to measure the FR distributions of a multiple-lamp array placed in air. However, further studies with aqueous solutions in practical UV reactors, which have a strong reflection impact from the inner wall and a shadowing effect induced by the compacted structure of these reactors, have not been reported.…”

Section: Introductionmentioning

confidence: 99%

In situ detailed fluence rate distributions in a UV reactor with multiple low-pressure lamps: Comparison of experimental and model results

Li¹,

Qiang²,

Bolton³

2013

Chemical Engineering Journal

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“…Decontamination of those surfaces is done daily by ward nurses using ethanol wipes, which increasingly contributes to their labor burden. The continuous ultraviolet (UV)-C irradiation is known to be effective in the disinfection of a broad range of bacteria, and has been used for decontamination of hospital environments such as patient rooms, air, and other surfaces [1,6,8,[25][26][27]. However, the continuous UV-C irradiations used for decontamination of these environments are not portable, and irradiation needs to be performed for as long as 10 to 50 min.…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study of the Bactericidal Activity and Daily Disinfection Housekeeping Surfaces by a New Portable Pulsed UV Radiation Device

et al. 2012

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Daily cleaning and disinfecting of non-critical surfaces in the patient-care areas are known to reduce the occurrence of health care-associated infections. However, the conventional means for decontamination of housekeeping surfaces of sites of frequent hand contact such as manual disinfection using ethanol wipes are laborious and time-consuming in daily practice. This study evaluated a newly developed portable pulsed ultraviolet (UV) radiation device for its bactericidal activity in comparison with continuous UV-C, and investigated its effect on the labor burden when implemented in a hospital ward. Pseudomonas aeruginosa, Multidrug-resistant P. aeruginosa, Escherichia coli, Acinetobacter baumannii, Amikacin and Ciprofloxacin-resistant A. baumannii, Staphylococcus aureus, Methicillin-resistant S. aureus and Bacillus cereus were irradiated with pulsed UV or continuous UV-C. Pulsed UV and continuous UV-C required 5 and 30 s of irradiation, respectively, to attain bactericidal activity with more than 2Log growth inhibition of all the species. The use of pulsed UV in daily disinfection of housekeeping surfaces reduced the working hours by half in comparison to manual disinfection using ethanol wipes. The new portable pulsed UV radiation device was proven to have a bactericidal activity against critical nosocomial bacteria, including antimicrobial-resistant bacteria after short irradiation, and was thus found to be practical as a method for disinfecting housekeeping surfaces and decreasing the labor burden.

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Method for Estimating Ultraviolet Germicidal Fluence Rates in a Hospital Room

Cited by 12 publications

References 14 publications

Using Computational Fluid Dynamics Modeling to Evaluate the Design of Hospital Ultraviolet Germicidal Irradiation Systems for Inactivating Airborne Mycobacteria^†

Using Computational Fluid Dynamics Modeling to Evaluate the Design of Hospital Ultraviolet Germicidal Irradiation Systems for Inactivating Airborne Mycobacteria^†

In situ detailed fluence rate distributions in a UV reactor with multiple low-pressure lamps: Comparison of experimental and model results

A Comparative Study of the Bactericidal Activity and Daily Disinfection Housekeeping Surfaces by a New Portable Pulsed UV Radiation Device

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Method for Estimating Ultraviolet Germicidal Fluence Rates in a Hospital Room

Cited by 12 publications

References 14 publications

Using Computational Fluid Dynamics Modeling to Evaluate the Design of Hospital Ultraviolet Germicidal Irradiation Systems for Inactivating Airborne Mycobacteria†

Using Computational Fluid Dynamics Modeling to Evaluate the Design of Hospital Ultraviolet Germicidal Irradiation Systems for Inactivating Airborne Mycobacteria†

In situ detailed fluence rate distributions in a UV reactor with multiple low-pressure lamps: Comparison of experimental and model results

A Comparative Study of the Bactericidal Activity and Daily Disinfection Housekeeping Surfaces by a New Portable Pulsed UV Radiation Device

Contact Info

Product

Resources

About

Using Computational Fluid Dynamics Modeling to Evaluate the Design of Hospital Ultraviolet Germicidal Irradiation Systems for Inactivating Airborne Mycobacteria^†

Using Computational Fluid Dynamics Modeling to Evaluate the Design of Hospital Ultraviolet Germicidal Irradiation Systems for Inactivating Airborne Mycobacteria^†