Technical data

9Manual - 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
050
Pressure loss [mbar]
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