Sunda Solar Tubes
API is the Eastern Canada Distributor for the Sunda Seido line of Evacuated Tube solar collectors. These collectors are industry leaders in the thermal technology, please see the Sunda site for company history and details. For technical information on the collector please click here.
| SEIDO1 series Heat Pipe Vacuum Tube Solar Collectors |
| SEIDO 1 evacuated tube solar collectors use a heat pipe with a dry fit connection for attachment to the solar collector header. This dry fit connection ensures easy installation and tubes can be conveniently replaced without shutting the system down. The SEIDO 1 is available in either an 8 or 16 tube array that can be used for most domestic water heating applications. The SEIDO 1 also allows multiple arrays to be linked together for larger domestic water heating needs as well as space heating. |
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SEIDO 1-8 Evacuated Tube Collector Complete (8 tubes)Flat Absorber Plate / Heat Pipe Design /Standard Header Box |
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SEIDO 1-16 Evacuated Tube Collector Complete (16 tubes)Flat Absorber / Heat Pipe Design / Standard Header Box |
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SEIDO 1-8AS Evacuated Tube Collector Complete (8 tubes)Flat Absorber / Heat Pipe Design / Extruded Aluminum Header |
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SEIDO 1-16AS Evacuated Tube Collector Complete (16 tubes) Flat Absorber / Heat Pipe Design / Extruded Aluminum Header |
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High Efficiency |
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High pressure resistance |
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Antifreeze |
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Reliability and durability |
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Fast start-up due to small thermal capacity |
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Easy installation and maintenance |
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Low heat loss due to thermal diode effect |
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Easy integration into buildings |
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High vacuum with long-tem stability |
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Sunda collector modules consist of an array of SEIDO evacuated tubes, insulated manifold header, support frame and standard frame package for single roof installation. Manifold headers have capacities of 8, 16 tubes. The collector manifold casing and end cap are made of powder-coated aluminium profile. The copper inlet and outlet pipe nipples come standard in Ø22 mm, making plumbing connections quick and easy using readily available metric compression fittings. The connection between the heat pipe and manifold is critically important to ensure optimal heat transfer. The manifold header pipe is mounted within the manifold casing and is made of Ø28 mm, 1 mm thick copper pipe rated for a maximum pressure of 10 kg/cm² - standard use is 6 kg/cm². The heat pipe vacuum tube collects heat from sun working with high efficiency and absorbing up to 92% of the incoming irradiation. Thereafter, the condenser of the heat pipe will transfer the heat to the manifold where the water is heated. The heated water will circulate in the system until the required temperature is attained. The heat transfer liquid of the heat circuit does not flow through the collector itself. This allows a very simple installation and guarantees an exceptionally trouble-free operation. The operation of the system will not be interrupted even if one of the collector tubes should get damaged. The manifold is mounted in a FCKW-free insulated box that largely protects the collector against heat loss. With its two vertical supports and the bottom support the insulated box provides a stable frame for the collector module. |
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| Technical Data |
| Module Type |
SEIDO1-8 |
SEIDO1-16 |
SEIDO1-8AS |
SEIDO1-16AS |
| Tube Construction |
SEIDO1--- Heat pipe vacuum tube with flat absorber |
| Certificate |
EN 12975 |
| Angle of Inclination |
15 ° to 90 ° |
| Number of Collector Tubes |
8 |
16 |
8 |
16 |
| Absorber Area |
1.38 m² |
2.77 m² |
1.38 m² |
2.77 m² |
| Arperture Area |
1.51 m² |
3.01 m² |
1.51 m² |
3.01 m² |
| Gross Area |
2.04 m² |
4.08 m² |
2.04 m² |
4.08 m² |
| Length x width x height (mm) |
2126 x 960 x 175 |
2126x 1920 x 175 |
2126 x 960 x 175 |
2126x 1920 x 175 |
| Weight |
50 Kg |
100 Kg |
50 Kg |
100 Kg |
| Efficiency Curve |
 |
| Pressure drop per module |
<5 mbar (100L/h) |
<12 mbar (200L/h) |
<5 mbar (100L/h) |
<12 mbar (200L/h) |
| Fluid content per module |
0.48 L |
0.96 L |
0.48 L |
0.96 L |
| Glass Material |
Borosilicate glass |
| Glass tube diameter |
100 |
| Wall thickness |
2.5mm |
| Transmittance |
0.90 |
| High vacuum, long-term stability |
<10-5 mbar |
| Absorber material |
Aluminum nitride |
| Selective coating |
Aluminum |
| Absorptance |
>0.92 |
| Emittance |
<0.08 |
| Header box material |
Aluminum |
Aluminum Alloy |
Aluminum |
Aluminum Alloy |
| Header box diameter |
100 mm |
130 mm |
| Insulation |
Polyurethane foam |
| Max. Operating pressure |
6 bar |
| Stagnation temperature, module |
190° |
| Stagnation temperature, pipe |
247°C |
| Assembling components |
Stainless steel vertical supports and bottom supports, aluminum/aluminum alloy header box, 30 mm thickness polyurethane insulation |
| Connection |
Compression fitting, 22mm |
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Customization and convenience
SEIDO1 solar collectors are available in four different models. The condensers of the collector tubes have a plug-in structure to make the tubes removable. The plug-in structure guarantees an easy installation since all parts are installed separately. Single tubes can conveniently be replaced without shutting the system down.
Top performance and versatility
An important asset of SEIDO1 solar collectors is their versatility. One of the application areas for SEIDO1 solar collectors is domestic water heating. Therefore installation requires remarkably little space making them practically applicable at any domestic place.
Despite their little size, the collectors still cover over 70% of the hot water needs of an average household. Their excellent efficiency makes them also suitable for the operation of larger systems for commercial or public use. In addition, SEIDO1 solar collectors are also applicable for space heating and air-conditioning. |
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A circuit and a system
A self-contained heating circuit transports the heat from the collector to the inhouse hot-water storage tank (approx.300L). There the heat is passed on to the inhouse hot-water storage tank by a heat exchanger and the water for domestic use is heated. When the heat supplied by the collector is not sufficient to attain the desired temperature, a conventional heating system takes over and completes the heating process. An electronic control unit (different-temperature regulator) constantly checks whether the temperature at the collector opening is greater than the temperature in the inhouse hot-water storage tank. If this is the case, the control unit switches on the heating circuit. |
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