Solar Water Heating

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Solar Water Heating

• By Sunny Gharial

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Overview

• Cost
• Advantages and Disadvantages
• How it works

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Cost of Solar Water Heating

• Cost of Solar Water Heating
• a single 4x8 collector can capture 1500-3000
  kWh/year
• cost 2000 - 4000
• do not pay monthly operating costs unlike oil
• initial cost is expensive but save in long run
• Solar Oil
• Initial Cost 3,500 1,500
• Operating Cost 0/year 700/year
• 15-year Cost 3,500 12,000

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Advantages of Solar Water Heating

• Reduces the amount of fuel needed to heat water
• Solar water heaters that consists of a
  photovoltaic module can operate during a power
  outage
• Can be used in other applications Clean
  alternative
• Very cost-effective

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Disadvantages of Solar Water Heating

• Efficiency reduced by atmospheric haze/dust
• Cool climates can damage collecting systems
• Do not work at night or in inclement weather
• Reflective surfaces of collectors can look
  unpleasant
• Not cost-effective in areas with short daylight
  hours

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How Solar Water Heating Works

• 3 main components solar collector, heat
  exchanger/pump module, storage tank
• Most common solar collectors are flat panel
• One or more solar collectors mounted on roof
• Solar collectors connected to storage tank
• When enough sunlight, heat transfer fluid pumped
  through collector
• Heated fluid is circulated to heat exchanger
• Energy is transferred into water tank
• Best performance when installed 18-50 to
  horizontal
• Should be installed on southeast/southwest
  orientation

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• 1) Metallic Absorber
• 2) Glazing
• 3) Housing
• 4) Insulation
• 5) Heat Transfer Fluid Inlet

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Resources

• http//www.canren.gc.ca/prod_serv/index.asp?Cad14
  1PgId750
• http//www.cansia.ca/downloads/factsheets/23.pdf
• http//www.energystar.gov/ia/new_homes/features/ES
  SolarWaterHeating.pdf
• http//www.state.hi.us/dbedt/ert/sol_t_hi.htmlanc
  hor351481