1. Solar Hot Water Heating
By: Ryan Kim

2. Contents Introduction to Solar Heating
How Solar Hot Water Heating Works
Passive and Active Hot Water Heating
Different Designs of Solar Hot Water Heating
Conclusion
References

3. Introduction to Solar Heating
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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
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4. How Solar Hot Water Heating Works
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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
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5. 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
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6. 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
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7. 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.

8. References
Canivan, John. “How to Build a Solar Hot Water System.” Accessed on October 9,
“Solar Water Heaters.” NAHB Research Center. Accessed on October 9,
“Solar Water Heating.” NAHB Research Center. Accessed on October 9,
“Solar Water Heating Consumer Guide.” GO Solar Company. Accessed on October 9,