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3.
Technical features
The collectors HWF 20 – HWF26 meet the EN 12975 European Standard, and is suitable for any kind of installation:
- on flat roofs
- on sloped roofs
- on the ground
and can be used to build small or big collector fields.
Following are the main technical features of the solar collector:
- high efficiency aluminium absorber, with selective coating
- copper pipes
- laser welding
- aluminium tank-frame
- clear solar glass with low iron content
- lower and side rock wool insulation
- left and right side hydraulic connections
3.1.
Technical specifications
Data
Gross surface
Opening surface
Absorber surface
Length
Width
Height
Capacity
Stagnation maximum temperature
Coefficient η0
Coefficient a1
Coefficient a2
IAM (K 50°)
Absorption (α)
Emission (ε)
Glass transmittancy
Maximum working pressure
Recommended flow rate (minimum/nominal/maximum)
Pressure loss (at nominal flow rate; 44% propylene glycol; 40°C)
Net weight (loadless)
Table 1 - Technical specifications
24
m.u.
HWF 20
sq m
2,06
sq m
1,93
sq m
1,93
mm
2022
mm
1019
mm
90
l
0,90
°C
-
-
-
-
%
%
%
bar
l/h
72/108/150
mbar
16,0
kg
32,2
EN
HWF 26
2,62
2,47
2,47
2022
1295
90
1,14
201,2
0,753
3,168
0,012
0,94
95
5
91
10
90/132/180
16,5
39,3
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