Airwell Wespak 2.69 [16/28] 2 4 6 8 10 12 14
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Airwell Wespak 2.69 [16/28] 2 4 6 8 10 12 14

Airwell Wespak 2.69 [16/28] 2 4 6 8 10 12 14
Page 16
Air-to-Air Plate Heat Recuperator
500 1000 1500 2000
1000 2000 3000
1000 2000 3000 4000 5000
45
50
55
60
65
Unit size
1.39
2.69
3.99
Air volume (m
3
/h)
Efficiency (%)
45
60
55
50
40
50
60
70
30
20
0.5
1.0
2.0
0
-2
-4
-6
-8
-10
-12
-14
80
70
65
Ratio
FA/EA
Efficiency (%)
Humidity (%)
Freezing limit temp. (°C)
30
Exhaust air dry bulb temp. (°C)
Recuperator nominal efficiency curve
Freezing limit temperatures
FA/EA Correction Factors
0.50 1.25
0.60 1.20
0.70 1.15
0.80 1.10
0.90 1.05
1.00 1.00
1.10 0.95
1.20 0.90
1.30 0.85
1.40 0.80
1.50 0.75
1.60 0.70
1.70 0.65
1.80 0.60
1.90 0.55
2.00 0.50
FA : Fresh air volume
EA : Exhaust air volume
Multiplier
Determine the Wespak size according to air flow and pressure
drop of the recuperator.
Read nominal efficiency on curve above.
Determine the actual efficiency by using the correction multiplier
Fresh air volume/Exhaust air volume (corrected efficiency =
nominal efficiency x correction factor).
Check the freezing limit temperature according to the dry bulb
exhaust air temperature, the corrected efficiency and the ratio
Fresh air volume/Exhaust air volume.
If :
LAT : Leaving Air Temperature
EF : Corrected efficiency
EAT : Exhaust air temperature
FAT : Fresh Air Temperature after eventual heating
We have : LAT = EF x (EAT - FAT) + FAT
Example of selection

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