ZEMCH 2019 International Conference Proceedings April.2020 | Page 45
18
78
76
16
72
C o o lin g
C o o lin g
H e a tin g
H e a tin g
70
68
66
T H R E ffc ie n c y
V A L ID T H R E ffc ie n c y
T H R E ffc ie n c y
V A L ID T H R E ffc ie n c y
15
Cooling ENERGY Coef.
Heating ENERGY Coef.
17
74
64
62
60
58
P re -fite r
H 11
H 12
14
13
12
11
H 13
F ilte r G ra d e
10
9
Pre-fiter
H11
H12
H13
Filter Grade
Figure 7. Efficiency change value of filter grade
Figure 8. Energy coefficient value of filter grade
3.2. Dust purification ability
Dust purification ability test was conducted through SPS‐KACA002‐132 air purifier test method
because specification and test method in heat‐recovery ventilation device are not prepared at present.
After 20 minutes of natural decay, 20 minutes of operation decay was performed for each dust collection
filter. The results of the dust cleaning ability were obtained as shown in Table 3 through the calculation
methods such as equations (4) and (5), and Fig. 10 is a graph of the dust cleaning capacity of each dust
filter. The results of the dust cleaning test showed that the H12 filter had better dust cleaning ability
than the H13 filter. It is analyzed that the dust cleaning ability of H13 grade filter is reduced by the
pressure difference in the equipment.
Table 3. Particle cleaning capacity of filter grade
Particle
cleaning capacity
(㎥/min)
1.66
1.89
1.67
Filter grade
H11
H12
H13
Coverage
Area(㎡)
12.81
14.59
12.85
3.50E+008
H11
H12
H13
H13
3.00E+008
3.00E+008
2.00E+008
2.00E+008
2.50E+008
2.50E+008
3.50E+008
H12
1.50E+008
1.50E+008
1.00E+008
H11
1.00E+008
0
5
10
15
20
5.00E+007
Time(min)
Figure 9. Particle reduction by filter grade
0
2
4
6
8
10
12
14
2
Coverage Area (m )
Figure 10. Coverage Area according to
filter grade
A Study on the Performance Variations of a Heat-recovery Ventilation System Using a Pre-filter and
HEPA filters
34