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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,
- mounting frame
- 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.
- 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
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)
OEM FLARE Collectors
|
SERIES |
|
ESSENCE OEM 10 FLARE |
|
Number of evacuated tubes |
|
20 |
|
ηº in relation to aperture, EN 12975 |
% |
65.1 |
|
a¹ with wind, in relation to aperture |
W/(m²k) |
1.765 |
|
a² with wind, in relation to aperture |
W/(m²k²) |
0.012 |
|
Kθ,trans (50°), in relation to aperture |
|
0.92 |
|
Kθ,long (50°), in relation to aperture |
|
1.82 |
|
Yield forecast (reference location Würzburg, Germany, aperture area 3 m²) |
kWh/m²a |
754 |
|
Yield forecast (reference location Würzburg, Germany, aperture area 5 m²) |
kWh/m²a |
574 |
|
Grid dimensions (length, height, depth) |
m |
1.66 x 0.71 x 0.133 |
|
Gross surface area |
m² |
1.18 |
|
Aperture area |
m² |
0.63 |
|
Collector contents |
l |
0.54 |
|
Weight |
kg |
25 |
|
Max. working overpressure |
bar |
8 |
|
Max. stagnation temperature |
°C |
210 |
|
Connection diameter, clamping ring |
mm |
22 |
|
Sensor sleeve |
mm |
6 |
|
Collector material |
|
aluminium alloy/ glass/ silicone/ PBT/ nylon/ 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 |
|
brushed aluminium |
|
Colour (plastic parts) |
|
black |
|
Tests and approvals |
|
EN 12975 1&2, Solar Keymark · ISO 9001 |
|
DIN CERTCO - Register number |
|
011-7S1473 R |
