What are flat-plate collectors used for?

What are flat-plate collectors used for?

• A. Heating water or air in residential solar thermal systems.
• B. Generating electricity in large-scale CSP plants.
• C. Cooling buildings via dark surfaces.
• D. Storing heat in molten salts.

Answer: (A)

Flat-plate solar thermal collectors are designed to absorb sunlight and transfer that heat to a fluid that flows through pipes, which can then be used to heat water or air for domestic hot water and space heating. They’re non-concentrating, operate at modest temperatures, and are commonly used in residential solar thermal systems. This is why heating water or air is the best fit: it matches the primary purpose of these collectors—capturing solar energy to produce usable heat for home applications. Generating electricity in large-scale CSP plants relies on concentrating mirrors to reach high temperatures and drive turbines, not flat-plate collectors. Cooling buildings via dark surfaces would increase heat absorption rather than reduce it, which isn’t what flat-plate collectors are used for. Storing heat in molten salts is a storage approach used in some CSP systems, not the primary function of a flat-plate collector.

Flat-plate solar thermal collectors are designed to absorb sunlight and transfer that heat to a fluid that flows through pipes, which can then be used to heat water or air for domestic hot water and space heating. They’re non-concentrating, operate at modest temperatures, and are commonly used in residential solar thermal systems.

This is why heating water or air is the best fit: it matches the primary purpose of these collectors—capturing solar energy to produce usable heat for home applications.

Generating electricity in large-scale CSP plants relies on concentrating mirrors to reach high temperatures and drive turbines, not flat-plate collectors. Cooling buildings via dark surfaces would increase heat absorption rather than reduce it, which isn’t what flat-plate collectors are used for. Storing heat in molten salts is a storage approach used in some CSP systems, not the primary function of a flat-plate collector.