Transcript SOLAR HOT WATER HEATING

SOLAR HOT WATER
HEATING
Tanvee Ghaisas
OBJECTIVES
• What is Solar Hot Water Heating?
• Uses
• Efficiency
What is Solar Hot Water
Heating?
• Use Sun’s heat to warm up water in
collectors
• 3 types of solar heating:
– Passive solar heating
– Active solar heating
– Solar collectors
Passive Solar Heating
• Solar collector heats water; storage tank
heats water
• Two types of passive solar heating
– Batch heaters
– Thermosiphon systems
Active Solar Heating
• Heated water moved through system with
aid of pumps; this increases the system’s
efficiency
• Two types of active solar heating
– Direct systems
– Indirect systems
Solar Collectors
Flat-plate collectors are used for residential water-heating and space-heating installations
Uses of Solar Hot Water
Heating
• Swimming pools
• Household uses:
– Cooking
– Plumbing
– Sanitary needs
– Cleaning
– Heating
Efficiency of Solar Hot Water
Heating
• Energy is required to heat water
– There is heat loss
– System not 100% efficient
Example: to heat 100 liters of water from
20ºC to 60ºC
E= mcΔt
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.
References
• http://www.itdg.org/docs/technical_information_s
ervice/solar_water_heating.pdf
• http://www.eere.energy.gov/solar/sh_basics.html