Installation manual

39Installation manual auroTHERM 0020077994_00
10 Technical data
Units VTK 570/2 VTK 1140/2
Number of vacuum tubes 6 12
η
0
(aperture), DIN4757-4 or EN12975
% 64.2
c
1
with wind, relative to aperture W/(m
2
k) 0.885
c
2
with wind, relative to aperture W/(m
2
k
2
) 0.001
K
θ,trans
(50°), relative to aperture
1
K
θ,long
(50°), relative to aperture
0.9
Predicted energy gain (location Würzburg, 5m
2
aperture, 300l cylinder, 4 persons)
kWh/m
2
a 586
Peak output per collector module W
peak
w 642 1278
Area-related heat capacity c kJ/(m
2
k) 8.3
Volume flow (per m
2
of collector surface) l/(m
2
h) 24
Minimum volume flow in solar circuit l/h 180
Absolute pressure in hard vacuum bar 10
-5
mbar (= 10
-8
bar)
Absorber absorption alpha > 93.5% (see also ITW test report)
Absorber emission epsilon < 6% (see also ITW test report)
Modular dimensions (length x height x depth) m 0.7 x 1.65 x 0.11 1.39 x 1.65 x 0.11
Gross area m
2
1.16 2.30
Aperture surface area m
2
1.0 2.0
Absorber surface area m
2
1.0 2.0
Collector capacity l 0.9 1.8
Weight kg 19 37
Operating overpressure, max. permissible bar 10 10
Standstill temperature, max. °C 295
Connection diameter, supply/return mm 15
Collector material Al / Cu / Glass / Silicon / PBT / EPDM / TE
Glass tubing material Borosilicate 3.3
Selective absorber coating material Aluminium nitrite
Glass tubing (outer dia./inner dia./wall thickness/tube
length)
47 / 37 / 1.6 / 1500
Colour (plastic parts) Black
Thermal shock test ITW test number 02COL282
Hail impact test per DIN EN 12975-2 TÜV test number 435/142448
Type approval number 01-228-770
Table 10.1 Technical data
Technical data 10
GB