Science Fact Finder | Energy - What Is The Difference Between Passive Solar Energy Systems And Active Solar Energy Systems?

What is the difference between passive solar energy systems and active solar energy systems?

Passive solar energy systems use the architectural design, natural materials, or absorptive structures of a building as an energy-saving system. The building itself serves as a solar collector and storage device. An example would be thick-walled stone and adobe dwellings that slowly collect heat during the day and gradually release it at night. Another example of a passive solar energy system is a greenhouse. Passive systems require little or no investment of external equipment.

Active solar energy systems require a solar collector (a device used to store energy) and controls linked to pumps or fans that draw heat from storage as necessary. Active solar systems generally pump a heat-absorbing fluid (air, water, or an antifreeze solution) through a collector. Collectors, such as insulated water tanks, vary in...

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