9
Manual - Solar hot water systems
Technical data of the tube collectors
Appliance designation
Units
auroTHERM exclusive VTK
275
auroTHERM exclusive VTK
550
Surface area (gross, aperture/net)
m
2
0.68 / 0.41
1.28 / 0.82
Height mm
1695
1695
Width mm
440
790
Depth mm
100
100
Weight kg
10.3
20
Collector capacity
l
1.6
3.56
Copper pipe connection, flat-face
Thread
3/4“
3/4“
Insulation: high vacuum
bar
10
-6
10
-6
Maximum operating pressure
bar
6
6
Pure silver mirror, degree of reflection
ρ
%
94
±
1
94
±
1
Absorber emission
ε
%
5
±
2
5
±
2
Absorber absorption
α
%
95
±
1.0
95
±
1.0
Solar sensor sleeve
∅
mm
6
6
CE label
0036
0036
Shutdown temperature (according to prEN 12975-2,
c < 1 m/s) in the glass tube
°C 250
250
Shutdown temperature (according to prEN 12975-2,
c < 1 m/s) at the collector connection
°C 180
180
Efficiency
η
0
(according to EN 12975)
%
78
±
3%
78
±
3%
Efficiency coefficient k
1
W/(m
2
•K) 1.09
±
0.2
1.09
±
0.2
Efficiency coefficient k
2
W/(m
2
•K
2
) 0.01
±
0.002
0.01
±
0.002
Table 4.1
Technical data tube collector auroTHERM exclusive
1,0
0,9
0,8
0,7
0,6
0,5
0,4
0,3
0,2
0,1
0
0
20
40
60
80
100
120
140
160
180
200 220 240
[%]
1000 W/m
2
Insolation
Temperature difference (collektor/ambient) [K]
auroTHERM exclusive
800 W/m
2
Insolation
300 W/m
2
Insolation
Fig. 4.4 Efficiency of the auroTHERM exclusive according to
DIN 4757/4
40
30
20
10
0
0
50
Pr
e
s
sur
e
lo
s
s
[
m
b
a
r]
100
150 200
250
300
Volume flow [l/h]
auroTHERM
exclusive
Fig. 4.5 Pressure loss of the auroTHERM exclusive collector
Description of the components 4
