ZEMCH 2019 International Conference Proceedings April.2020 | Page 41
1. Introduction
Recently, the air pollution problem caused by yellow dust and fine dust is very serious
internationally. According to the ‘2018 World Air Quality Report’ (Global Air Pollution Research
Institute: AirVisual) released in March 19 by the international environmental organization Greenpeace,
Korea has the second highest concentration of ultra fine dust in the atmosphere among OECD
countries[1]. Ultra fine dust causes various diseases and is harmful to the human body, so indoor
activities are increasing compared to outdoor activities[2]. Accordingly, interest and necessity for
indoor air quality and ventilation are also increasing. As airtightness and high insulation are important
for energy saving, sufficient ventilation in the room is determined by the performance of the ventilation
system[3]. Jang and Choi (2005), through experimental studies on the thermal performance of the total
heat recovery ventilation, confirmed that the recovered heat increased in the product with large heat
exchange area. In addition, the usefulness of the product decreased as the wind speed increased[4].
Chang and Hong(2008) compared performance of the devices on the market by measuring the fan static
pressure, air flow characteristics, air leakage rate, and heat exchange efficiency of the heat recovery
ventilator[5]. However, in the Korean ventilation system market, the ventilation system using only pre‐
filter is dominant, and there is no performance standard for the ventilation system using HEPA filter
that can filter out ultra fine dust[6]. Therefore, this study aimed to measure the heat‐recovery ventilator
performance (Total heat exchange efficiency, air leakage rate, effective heat exchange efficiency, noise,
power consumption, energy coefficient) when pre‐filter and HEPA filters named H11, H12 and H13
were applied. And the dust purification performance using the dust collection filter is compared with
the performance of each filter.
2. Performance test apparatus and test method
2.1. Performance test device and test sample
In this study, the efficiency change of the HEPA filter was applied to the heat‐recovery ventilation
system. The schematic diagram of the total heat exchanger is shown in Figure 1 and the test samples are
shown in Table 1.
Table 1. Sizes of the test samples.
Parameter
Heat‐
recovery
ventilator
Pre‐filter,
H11, H12, H13
Size Unit
525(W)×625(L)×
242(H) mm
235(W)×190(H)×
10T mm
Figure 1. Schematic diagram of a Heat‐
recovery ventilator.
2.2. Evaluation Method Using Dust Collecting Filter
In this study, two chambers were used to verify the performance of heat‐recovery ventilator based on
KS B 6879. The experimental conditions are shown in Table 2. The leakage rate of each type of filter was
measured using a CO2 generator and is shown in Figure 2. The total heat exchange efficiency is given by
equation 1 and the leak rate is given by equation 2. Equation 3 shows the correlation between efficiency and
power consumption of the total heat exchanger.
A Study on the Performance Variations of a Heat-recovery Ventilation System Using a Pre-filter and
HEPA filters
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