Solar Hot Water Heating

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Solar Hot Water Heating By Ryan Kim
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Contents

1. Introduction to Solar Heating
2. How Solar Hot Water Heating Works
3. Passive and Active Hot Water Heating
4. Different Designs of Solar Hot Water Heating
5. Conclusion
6. References

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Introduction to Solar Heating
Picture taken from http//www.solarexpert.com/He
atdhw.html

• Been around since the 1800s
• Modern applications resemble skylights
• Significantly reduce energy bills
• Generation of energy depends on
• Geographic location
• Design of system
• Size and orientation of solar collector

Reference http//www.toolbase.org/techinv/techDe
tails.aspx?technologyID112
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How Solar Hot Water Heating Works
Picture taken from http//www.pharoengineering.co
m.my/DOMESTICPAGE.htm

• Cold water supply connected to solar storage tank
  (another water tank separate from the water
  heater)
• Water is circulated between solar storage tank
  and solar collectors
• Heated water from the solar storage tank is
  outputted to input of conventional water heater
• If water is not as hot as necessary, conventional
  water heater heats it up

Reference http//www.solarexpert.com/Heatdhw.htm
l
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Passive and Active Water Heating

• Passive (Gentle Climates)
• Uses a batch heater, which could be a water tank
  painted black
• For more efficiency, tank can be insulated and
  glazing can be installed
• Storage tank usually located on the roof
• Active (Harsher Climates)
• Uses a small pump for circulation since there is
  no tank on roof
• Although it uses electricity, it generates a lot
  more energy
• Also has valves and controllers
• Easier to install

References http//www.jc-solarhomes.com/how_to.h
tm http//www.toolbase.org/tertiaryT.asp?Document
ID3216CategoryID949
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Different Designs of Solar Heating

• Types of Systems
• Open-Loop (Direct) Active
• Circulates household water
• Closed-Loop (Indirect) Active
• Circulates heat-transfer fluid
• Heat exchangers transfer heat from fluid to water
  in storage tanks
• Batch Heaters (Passive)
• a.k.a Bread Box, ICS systems
• Storage tanks contained inside insulated boxes
  with a glazed side
• Mounted on ground or roof
• Thermosiphon (Passive)
• Relies on natural convection
• Tank mounted on top of collector
• Can be a closed-loop to prevent freezing

Reference http//www.toolbase.org/tertiaryT.asp?
DocumentID3216CategoryID949
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Conclusion

• Generate at least 70 of energy required to heat
  water
• Technology used for over a century in household
  heating
• Several types of installations make it feasible
  for consumers
• Therefore, solar water heating is one of the
  most cost-efficient and environmentally friendly
  solutions for hot water production in a household.

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References

• Canivan, John. How to Build a Solar Hot Water
  System. Accessed on October 9, 2005
  http//www.jc-solarhomes.com/how_to.htm.
• Solar Water Heaters. NAHB Research Center.
  Accessed on October 9, 2005 http//www.toolbase.or
  g/techinv/techDetails.aspx?technologyID112.
• Solar Water Heating. NAHB Research Center.
  Accessed on October 9, 2005 http//www.toolbase.or
  g/tertiaryT.asp?DocumentID3216CategoryID949.
• Solar Water Heating Consumer Guide. GO Solar
  Company. Accessed on October 9, 2005
  http//www.solarexpert.com/Heatdhw.html.