Prototyping a low-cost residential air quality device using ultraviolet germicidal irradiation (UVGI) light

Mohammad Al-Rawi; Annette Lazonby; Callan Smith

doi:10.1016/j.ohx.2021.e00251

Prototyping a low-cost residential air quality device using ultraviolet germicidal irradiation (UVGI) light

HardwareX. 2021 Dec 16:11:e00251. doi: 10.1016/j.ohx.2021.e00251. eCollection 2022 Apr.

Authors

Mohammad Al-Rawi¹, Annette Lazonby², Callan Smith³

Affiliations

¹ Centre for Engineering and Industrial Design, Waikato Institute of Technology (Wintec), Hamilton, New Zealand.
² Faculty of Business and Economics, The University of Auckland, Auckland, New Zealand.
³ Designer at Modern Transport Engineers, Hamilton, New Zealand.

Abstract

Many New Zealand residential dwellings suffer from dampness and fungi during the winter, which can cause respiratory health problems. This can be due to poor insulation and ventilation, and the situation worsens when residents cannot afford to heat the dwelling. The main aim of this paper is to modify an existing dehumidifier so that it can remove moisture, heat the living space and reduce fungi growth and bacteria. To achieve that, we installed ultraviolet germicidal lights (UVGI) in an existing dehumidifier with a total cost of USD $150.7 (NZD $213.76). The UVGI lights are known to be efficient in destroying the DNA of fungi and bacteria. The results show that the device reduced the fungi growth and did increase the room temperature because the dehumidifier captured two litres of water over 24 h of testing. The proposed device did achieve a reduction in particulate matters, from 0.9 $μ g / m^{3}$ to 0.14 $μ g / m^{3}$ and an acceptable range of relative humidity below 50%, which reduces the favourable conditions for fungi growth. Therefore, our proposed low-cost device does improve the indoor air quality (IAQ) in the living space.

Keywords: Dehumidification; Indoor air quality (IAQ); Reduce fungi; Ultraviolet germicidal irradiation (UVGI) lights.