Solar-Assisted Water Heater       Chen, Cheng-Han        Yu, Ssu-Chieh
Motivation• Solar Energy is “clean”• It saves the money• Solar-assisted water heat becomes more and  more popular in low-l...
Background• It heats water by solar energy• It works during day time &with enough sun  light• Domestic• Hotel• School• Oth...
Schematic Diagram
Solar Collector        Two main kinds of solar collector1. Flat-plate collectors2. Evacuated tube collectors
Glazed Flat Plate Solar Collectors• Moderate cost• Higher temperature  operation• Can operate at mains  water pressure• He...
Evacuated Tube Collectors• Higher cost• No convection losses• High temperature• Cold climates• Fragile• Installation  can ...
Solar Collectors                                Pros                          Cons                   •Capable to deliver m...
Model Assumptions• Steady State• Close & Open Loop• Consider Pressure Drop Loss• Isolation in the tank• Qin is averaged
Model Parameters
Results• Efficiency is about 45-55%, which is close to  the solar collector efficiency• Outlet temperature is over 40C,whi...
Conclusion• System performance highly depends on solar input (isolation level)• System efficiency mostly depends on solar ...
Future Work• Exergy Balance• Cost• Geography• Tilt angle• Working fluid
Reference• http://www.pipeflowcalculations.com/pressur  edrop/index.htm• http://www.builditsolar.com/References/Calc  ulat...
THANK YOU
E&M Project  Slides Alan & Jay
E&M Project  Slides Alan & Jay
E&M Project  Slides Alan & Jay
Upcoming SlideShare
Loading in …5
×

E&M Project Slides Alan & Jay

540 views

Published on

0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
540
On SlideShare
0
From Embeds
0
Number of Embeds
6
Actions
Shares
0
Downloads
6
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

E&M Project Slides Alan & Jay

  1. 1. Solar-Assisted Water Heater Chen, Cheng-Han Yu, Ssu-Chieh
  2. 2. Motivation• Solar Energy is “clean”• It saves the money• Solar-assisted water heat becomes more and more popular in low-latitude country• It is quite safe
  3. 3. Background• It heats water by solar energy• It works during day time &with enough sun light• Domestic• Hotel• School• Other use
  4. 4. Schematic Diagram
  5. 5. Solar Collector Two main kinds of solar collector1. Flat-plate collectors2. Evacuated tube collectors
  6. 6. Glazed Flat Plate Solar Collectors• Moderate cost• Higher temperature operation• Can operate at mains water pressure• Heavier and more fragile Photo Credit: NRCan
  7. 7. Evacuated Tube Collectors• Higher cost• No convection losses• High temperature• Cold climates• Fragile• Installation can be more Photo Credit: NRCan complicated• Snow is less of a problem Tube Developed and Manufactured in China Photo Credit: Nautilus
  8. 8. Solar Collectors Pros Cons •Capable to deliver moderate •Heavier collector weight temperature hot water •Large wind load under windFlat-plate •Lower cost when compared conditioncollectors with the evacuated tube •More susceptible to collectors blockage and leakage •More complicated in maintenance issueEvacuated •Lower heat loss to the •Higher capital cost surrounding compared with flat-plate tube •Capable to deliver to high collectorCollectors temperature water •Lighter support structure •Simplicity in maintenance
  9. 9. Model Assumptions• Steady State• Close & Open Loop• Consider Pressure Drop Loss• Isolation in the tank• Qin is averaged
  10. 10. Model Parameters
  11. 11. Results• Efficiency is about 45-55%, which is close to the solar collector efficiency• Outlet temperature is over 40C,which is enough for domestic use (34 C)
  12. 12. Conclusion• System performance highly depends on solar input (isolation level)• System efficiency mostly depends on solar collector efficiency• Ambient temperature is influential to thermal efficiency of the system• Inlet flow rate is related to outlet temperature• Pump works against the pressure drop• Pressure drops is not important to system efficiency• Good business model may help this industry grow faster• The cost of the product is important to costumers due to electric bill they may save after several years• Control engineering is also important to this system
  13. 13. Future Work• Exergy Balance• Cost• Geography• Tilt angle• Working fluid
  14. 14. Reference• http://www.pipeflowcalculations.com/pressur edrop/index.htm• http://www.builditsolar.com/References/Calc ulators/Collector/ColEfic.htm• Solar water heating project analysis, Retscreen international• Solar thermal collector for water heating, Energy Efficiency Office, Electrical and Mechanical Services Department, HK
  15. 15. THANK YOU

×