Instruction manual WWH-EC and WWH-LT Air heater
Page 14/14
6
Water temperatures/ air volumes
The conversion diagram shows heater capacities in KW under different conditions. These conditions
may be:
- Water temperature, for example 90/70°C (Regime)
- Air temperature sucked by the fan (Air temp)
6.1 WWH-EC capacities at several water temperatures
In situations where other inlet- and return water temperatures are applied, the original (registered)
heater capacity should be multiplied with the value in the table below. The WWH-EC is not classified for
steam applications.
Air temperature
Water temperature
0°C
5°C
10°C
15°C
18°C
20°C
90/70°C
1.30
1.19
1.10
1.00
0.94
0.91
80/60°C
1.11
1.01
0.91
0.82
0.76
0.73
70/50°C
0.92
0.82
0.73
0.64
0.56
0.55
60/40°C
0.73
0.64
0.54
0.45
0.40
0.37
50/30°C
0.54
0.45
0.37
0.27
0.22
0.18
6.2 WWH-LT capacities at several water temperatures
In situations where other inlet- and return water temperatures are applied, the registered heater
capacity should be multiplied with the value in the table below. The WWH-LT is not classified for steam
applications.
Air temperature
Water temperature
0°C
5°C
10°C
15°C
18°C
20°C
45/35°C
1.76
1.51
1.25
1.00
0.81
0.74
50/30°C
1.56
1.30
1.07
0.78
0.64
0.52
60/40°C
2.11
1.85
1.56
1.30
1.16
1.07
70/50°C
2.66
2.37
2.11
1.85
1.62
1.59
6.3 Example
What is the output of a WWH 235-EC with a water supply (regime) of 80/60 °C, in a room with a
environment temperature of 10 °C?
The table in paragraph 2.1 states the power of the WWH 235-EC at a regime of 90/70 degrees and an
environmental temperature of 15°C. This is 27. kW. With a regime of 80/60 degrees and 10 degrees room
temperature, the conversion factor according to the table above in paragraph 9.1 is 0.91.
De capacity will therefore become 0.91x27.8kW = 25.3 kW.
