W9
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2021-09-23
7.4 Econo, pressure loss in water-heated air heaters
Water flow, l/h
Water-heated air
thermostat
Pr
essur
e loss, kPa
Water-heated air
heater
7.5 Econo, sizing of the water-heated air heater
Inlet flow
water
°C
Water flow
(l/h)
Airflow (l/s)
Capacity (kW)
40
60
80
100
120
140
160
180
200
220
240
35
40
0.6
0.7
0.8
0.8
0.9
0.9
0.9
0.9
1
1
1
80
0.9
1
1.1
1.2
1.2
1.3
1.3
1.3
1.3
1.4
1.4
150
1.1
1.4
1.6
1.7
1.7
1.8
1.8
1.9
2
2
2.1
220
1.2
1.5
1.8
2
1.9
2
2.2
2.2
2.3
2.4
2.5
50
40
1
1.1
1.1
1.2
1.4
1.5
1.5
1.5
1.5
1.5
1.6
80
1.4
1.6
1.8
1.9
2.1
2.2
2.2
2.3
2.4
2.4
2.4
150
1.7
2.1
2.5
2.7
2.8
3
3.1
3.2
3.3
3.4
3.5
220
1.8
2.3
2.8
3.1
3.1
3.4
3.6
3.7
3.8
4
4.1
70
40
1.4
1.6
1.7
1.8
2.3
2.4
2.4
2.4
2.5
2.5
2.5
80
2.1
2.5
2.8
3
3.3
3.4
3.5
3.7
3.7
3.8
3.8
150
2.4
3.1
3.6
4
4.3
4.6
4.8
5
5.2
5.3
5.5
220
2.6
3.4
4
4.6
4.8
5.1
5.5
5.8
6
6.3
6.5
90
40
2.4
2.8
3
3.1
3.3
3.4
3.4
3.5
3.5
3.6
3.6
80
2.9
3.5
3.9
4.3
4.5
4.8
4.9
5.1
5.2
5.3
5.4
150
3.2
4.1
4.9
5.4
5.9
6.3
6.6
6.9
7.1
7.4
7.5
220
3.3
4.3
5.2
6
6.6
7
7.5
7.9
8.2
8.5
8.8