© 2004-2009 Solar Essence ® Ltd. All Rights Reserved. Last Updated - 29/9/09
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Advanced Renewable Energy Solutions - solar heating, dual solar heating, solar home, solar water heating, solar system, solar collectors, solar power, solar energy, solar thermal
solaressence® evacuated collectors
In 1893, Scottish physicist James Dewar invented a double-walled vessel with a vacuum-insulated gap - the thermos flask. Based on the principle of the thermos flask, already in 1909 Emmet developed evacuated tubes in order to make solar power usable. Even today, his patents from that time are the basis for modern evacuated tube technology. However, the efficiency of this old and well-known technology of the thermos flask could be brought to the highest level only with the help of modern coating technologies and highly selective layers.
The technology - today
The solaressence® range of evacuated tube collectors consists of 3 main components.
- evacuated tubes,
- CPC mirrors, and
- collecting box with heat transfer unit.
The evacuated tube
The evacuated tube is a product that is optimised in geometry and performance. The tubes are composed of two concentric glass tubes which in each case are half spherically closed on one side and fused together on the other side. The gap between the tubes is evacuated and afterwards hermetically plugged (vacuum insulation).
In order to make solar power usable, the internal glass tube is provided on its external surface with an environmentally friendly, highly selective layer and thus designed as an absorber. This coating is thus protected within the vacuum gap. It is an aluminium nitrite sputter layer which is characterized by very low emission and very good absorption.
The CPC mirror
In order to increase the efficiency of the evacuated tubes, a highly reflecting, weather-proof CPC mirror (Compound Parabolic Concentrator) is placed behind the evacuated tubes. The special mirror geometry ensures that even at unfavourable irradiation angles direct and diffuse sunlight falls onto the absorber. This substantially improves the energy yield of a solar collector. Unfavourable irradiation angles are given at diagonally incoming light (azimuth angle) (no south adjustment of the mounting area, sun progress from east to west, diffuse irradiation).
Collecting box and heat transfer unit
The insulated collecting and distribution pipes are located inside the collecting box. The advance or return connection can take place alternatively on the left of or on the right. In each evacuated tube there is a U pipe with direct flow-through that is connected in such a way to the collecting or distribution pipe that each individual evacuated tube exhibits the same hydraulic resistance. This U pipe is pressed to the inside of the evacuated tube with the heat guide plate.
It all adds up to make the solaressence® range of evacuated tube collectors one of the most advanced available in the market place today.
- absorber plate protected from wind and adverse weather providing perfect insulation
- vacuum provides long life
- all weather working capability provides energy all year round
- saving you even more money
- highly efficient advanced design
technical
Energy Conversions:
1 kWh = 3412 Btu = 3600000 Joules = 0.03412 Therms
Calorific Values: Natural Gas = 10.97 kWh/m3 Light Oil = 11.53 kWh/litre Butane = 13.69 kWh/kg Coal = 7395 kWh/t
(figures assume 100% boiler efficiency)
solaressence® OEM FLARE Collectors
|
SERIES |
|
ESSENCE CPC 6 INOX |
ESSENCE CPC 12 INOX |
ESSENCE CPC 18 INOX |
|
Number of evacuated tubes |
|
6 |
12 |
18 |
|
ηº in relation to aperture, EN 12975 |
% |
64.2 |
64.2 |
64.2 |
|
a¹ with wind, in relation to aperture |
W/(m²k) |
0.89 |
0.89 |
0.89 |
|
a² with wind, in relation to aperture |
W/(m²k²) |
0.001 |
0.001 |
0.001 |
|
Kθ,trans (50°), in relation to aperture |
|
1 |
1 |
1 |
|
Kθ,long (50°), in relation to aperture |
|
0.9 |
0.9 |
0.9 |
|
Yield forecast (reference location Würzburg, Germany, aperture area 3 m²) |
kWh/m²a |
651 |
651 |
651 |
|
Yield forecast (reference location Würzburg, Germany, aperture area 5 m²) |
kWh/m²a |
589 |
589 |
589 |
|
Grid dimensions (length, height, depth) |
m |
0.70 x 1.64 x 0.1 |
1.39 x 1.64 x 0.1 |
2.08 x 1.64 x 0.1 |
|
Gross surface area |
m² |
1.15 |
2.28 |
3.41 |
|
Aperture area |
m² |
1.0 |
2.0 |
3.0 |
|
Collector contents |
l |
0.9 |
1.8 |
2.6 |
|
Weight |
kg |
19 |
35 |
52 |
|
Max. working overpressure |
bar |
10 |
10 |
10 |
|
Max. stagnation temperature |
°C |
272 |
272 |
272 |
|
Connection diameter, clamping ring |
mm |
15 |
15 |
15 |
|
Sensor sleeve |
mm |
6 |
6 |
6 |
|
Collector material |
|
Al/ stainless steel/ glass/ silicone/ PBT/ EPDM/ TE | ||
|
Glass tube material |
|
borosilicate glass 3.3 | ||
|
Selective absorber coating material |
|
aluminium nitrite | ||
|
Glass tube (Ø ext./Ø int./wall thickness/tube len.) |
mm |
47/37/1.6/1500 | ||
|
Colour (aluminium frame profile, powder-coated) |
|
RAL 7015 | ||
|
Colour (plastic parts) |
|
black | ||
|
Thermal shock test |
ITW test no. |
06COL513/1 | ||
|
Hailstone test according to DIN EN 12975-2 |
TÜV test no. |
435/142448 | ||
|
Other tests and approvals |
|
EN 12975, RAL UZ 73, Solar Keymark · ISO 9001 | ||
|
DIN CERTCO - Register number |
|
011-7S113R | ||
|
SERIES |
|
ESSENCE OEM 20 FLARE |
ESSENCE OEM 30 FLARE |
|
Number of evacuated tubes |
|
20 |
30 |
|
ηº in relation to aperture, EN 12975 |
% |
56.1 |
56.1 |
|
a¹ with wind, in relation to aperture |
W/(m²k) |
1.61 |
1.61 |
|
a² with wind, in relation to aperture |
W/(m²k²) |
0.004 |
0.004 |
|
Kθ,trans (50°), in relation to aperture |
|
1.17 |
1.17 |
|
Kθ,long (50°), in relation to aperture |
|
0.93 |
0.93 |
|
Yield forecast (reference location Würzburg, Germany, aperture area 3 m²) |
kWh/m²a |
559 |
559 |
|
Yield forecast (reference location Würzburg, Germany, aperture area 5 m²) |
kWh/m²a |
506 |
506 |
|
Grid dimensions (length, height, depth) |
m |
1.47 x 1.64 x 0.13 |
2.20 x 1.64 x 0.13 |
|
Gross surface area |
m² |
2.40 |
3.60 |
|
Aperture area |
m² |
1.75 |
2.62 |
|
Collector contents |
l |
1.1 |
1.65 |
|
Weight |
kg |
49 |
73.5 |
|
Max. working overpressure |
bar |
8 |
8 |
|
Max. stagnation temperature |
°C |
225 |
225 |
|
Connection diameter, clamping ring |
mm |
22 |
22 |
|
Sensor sleeve |
mm |
6 |
6 |
|
Collector material |
|
Al/ stainless steel/ glass/ silicone/ PBT/ EPDM/ TE | |
|
Glass tube material |
|
borosilicate glass 1.6 | |
|
Selective absorber coating material |
|
aluminium nitrite | |
|
Glass tube (Ø ext./Ø int./wall thickness/tube len.) |
mm |
47/37/1.5/1639 | |
|
Colour |
|
stainless steel | |
|
Colour (plastic parts) |
|
black | |
|
Thermal shock test |
SPF test no. |
C782QPEN | |
|
Other tests and approvals |
|
EN 12975 1&2, ISO 9001 | |
solaressence® CPC INOX Collectors
