Solar Evacuate Tube thermal Collector.ppt

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chandrashekharmahaja6

Evacuated Tube Collectors

1
POTENTIAL OF EVACUATED
TUBE COLLECTOR

3
Solar Collectors:
Flat Plate Collectors
Evacuated Tube Collectors
Solar Concentrators

4
Main Emphasis :
• To reduce heat losses due to
conduction, convection and radiation
• By creating vacuum, Conduction and
Convection losses are nearly zero.
• By proper selective coating (a≈1, ε≈0)
radiative losses are minimized.

11
Left Tube = Vacuum Present
Right Tube = Faulty

12
Type of
Collector
Conversion
Factor
Thermal Loss
Factor in W/m²
°C
Temperature
Range in °C
Absorber
(uncovered)
0,82 to 0,97 10 to 30 up to 40
Flat-plate collector 0,66 to 0,83 2,9 to 5,3 20 to 80
Evacuated-plate
collector
0,81 to 0,83 2,6 to 4,3 20 to 120
Evacuated-tube
collector
0,62 to 0,84 0,7 to 2,0 50 to 120
Reservoir collector about 0,55 about 2,4 20 to 70
Air collector 0,75 to 0,90 8 to 30 20 to 50

13
Efficiency graph of solar collector performance

14
Graph of efficiency and temperature ranges of various types of
collectors (radiation: 1000 W/m²)

Prof. M. G. Takwale 21

Prof. M. G. Takwale 24

29
Thank you!

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Solar Evacuate Tube thermal Collector.ppt

1. 1 POTENTIAL OF EVACUATED TUBE COLLECTOR

3. 3 Solar Collectors: Flat Plate Collectors Evacuated Tube Collectors Solar Concentrators

4. 4 Main Emphasis : • To reduce heat losses due to conduction, convection and radiation • By creating vacuum, Conduction and Convection losses are nearly zero. • By proper selective coating (a≈1, ε≈0) radiative losses are minimized.

11. 11 Left Tube = Vacuum Present Right Tube = Faulty

12. 12 Type of Collector Conversion Factor Thermal Loss Factor in W/m² °C Temperature Range in °C Absorber (uncovered) 0,82 to 0,97 10 to 30 up to 40 Flat-plate collector 0,66 to 0,83 2,9 to 5,3 20 to 80 Evacuated-plate collector 0,81 to 0,83 2,6 to 4,3 20 to 120 Evacuated-tube collector 0,62 to 0,84 0,7 to 2,0 50 to 120 Reservoir collector about 0,55 about 2,4 20 to 70 Air collector 0,75 to 0,90 8 to 30 20 to 50

13. 13 Efficiency graph of solar collector performance

14. 14 Graph of efficiency and temperature ranges of various types of collectors (radiation: 1000 W/m²)

21. Prof. M. G. Takwale 21

24. Prof. M. G. Takwale 24

29. 29 Thank you!

Editor's Notes

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2