What is the primary function of solar thermal systems?

What is the primary function of solar thermal systems?

• A. To capture heat from the sun and use it to warm air, water, or generate electricity.
• B. To convert sunlight directly into electricity.
• C. To store solar energy in batteries.
• D. To reflect sunshine for passive heating only.

Answer: (A)

Solar thermal systems are built to capture heat from the sun and put that heat to work. The collectors absorb solar radiation and transfer it to a fluid, which becomes hot. That heat can be used directly to warm air or water for buildings, or it can generate steam to drive a turbine and produce electricity in concentrated solar power plants. This is different from solar photovoltaic systems, which convert sunlight directly into electricity without a heating step. Storing energy in batteries isn’t the primary role of solar thermal systems—the usual storage approach is thermal storage, like molten salt, to hold heat for later use. Reflecting sunshine for passive heating describes a different, passive approach and isn’t the main function of active solar thermal collectors.

Solar thermal systems are built to capture heat from the sun and put that heat to work. The collectors absorb solar radiation and transfer it to a fluid, which becomes hot. That heat can be used directly to warm air or water for buildings, or it can generate steam to drive a turbine and produce electricity in concentrated solar power plants. This is different from solar photovoltaic systems, which convert sunlight directly into electricity without a heating step. Storing energy in batteries isn’t the primary role of solar thermal systems—the usual storage approach is thermal storage, like molten salt, to hold heat for later use. Reflecting sunshine for passive heating describes a different, passive approach and isn’t the main function of active solar thermal collectors.