SOLAR HOT WATER HEATING

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SOLAR HOT WATER HEATING

• Tanvee Ghaisas

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OBJECTIVES

• What is Solar Hot Water Heating?
• Uses
• Efficiency

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What is Solar Hot Water Heating?

• Use Suns heat to warm up water in collectors
• 3 types of solar heating
• Passive solar heating
• Active solar heating
• Solar collectors

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Passive Solar Heating

• Solar collector heats water storage tank heats
  water
• Two types of passive solar heating
• Batch heaters
• Thermosiphon systems

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Active Solar Heating

• Heated water moved through system with aid of
  pumps this increases the systems efficiency
• Two types of active solar heating
• Direct systems
• Indirect systems

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Solar Collectors

• Flat-plate collectors are used for residential
  water-heating and space-heating installations

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Uses of Solar Hot Water Heating

• Swimming pools
• Household uses
• Cooking
• Plumbing
• Sanitary needs
• Cleaning
• Heating

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Efficiency of Solar Hot Water Heating

• Energy is required to heat water
• There is heat loss
• System not 100 efficient

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• Example to heat 100 liters of water from 20ºC
  to 60ºC
• E mc?t
• E (100l)(4.2J/lºC)(40ºC)
• E 16.8MJ
• Therefore, 16.8MJ of energy is required only to
  heat the water. Electricity can be used to heat
  water, but it tends to be expensive and
  unavailable in some areas.

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References

• http//www.itdg.org/docs/technical_information_ser
  vice/solar_water_heating.pdf
• http//www.eere.energy.gov/solar/sh_basics.html