Abstract
Many people spend most of their time in an indoor environment. A positive relationship exists between indoor environmental quality and the health, wellbeing, and productivity of occupants in buildings. The indoor environment is affected by pollutants, such as gases and particles. Pollutants can be removed from the indoor environment in various ways. Air-cleaning devices are commonly marketed as benefiting the removal of air pollutants and, consequently, improving indoor air quality. Depending on the type of cleaning technology, air cleaners may generate undesired and toxic byproducts. Different air filtration technologies, such as electrostatic precipitators (ESPs) have been introduced to the market. The ESP has been used in buildings because it can remove particles while only causing low pressure drops. Moreover, ESPs can be either in-duct or standalone units. This review aims to provide an overview of ESP use, methods for testing this product, the performance of existing ESPs concerning removing pollutants and their byproducts, and the existing market for ESPs.
Highlights
Many people spend most of their working and living hours in an indoor environment [1]
An experimental study shows that a novel electrostatic precipitators (ESPs) that uses anticorrosive materials can generate a large number of unipolar ions whilst producing only a negligible concentration of ozone, and achieve a strong collection performance of more than 95% for ultrafine particles, while only consuming a power of 5 W and generating a pressure drop of 5 Pa per 1200 m3/h [16]
The ozone generation from ESP is usually quantified by one of the following three methods [58]: (1) the face test method, in which ozone concentration is measured near the exterior exhaust face of the device; (2) the single-pass test method, similar to the face test method, in which the ozone concentration increase across the ESP is measured using inert ductwork attached to the unit and the ozone generation rate is directly calculated as the product of ozone concentration increase and airflow rate; and (3) the chamber test method, in which the ozone generation rate is calculated using a mass-balance model based on the measured average chamber/room/house ozone concentration and ozone natural deposition rate
Summary
Many people spend most of their working and living hours in an indoor environment [1]. If the outdoor particle level is high, ventilation will increase indoor particle pollution and the particles need to be removed by filters of the supply air or in-room standalone air cleaners. The electrostatic precipitator (ESP) has been used as an air cleaning technology in mechanical ventilation systems in residential buildings, since it can remove particles while only causing low pressure drops. Some procedures were introduced to examine the performance of air cleaning technologies, including electrostatic precipitation, and some standards (e.g., ANSI/AHAM AC-1 [17]; GB/T 18,801 [18]) were established to test the pollutant removal ability of the air cleaners placed in a duct. This review aims to give an overview of ESP use, methods for testing this product, the performance of existing ESPs in removing pollutants, their by-products, and the existing market for ESPs
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