What is the primary function of a solar collector in a thermal system?
A solar collector absorbs solar radiation and converts it into heat for water or air heating.
Which component stores heat energy in a solar thermal system?
Storage tanks hold the heated water or fluid for later use, balancing supply and demand.
What is the role of a heat exchanger?
Heat exchangers transfer heat between fluids without mixing them, critical in closed-loop systems.
Which fluid is commonly used in solar thermal systems?
Propylene glycol is often used as a heat transfer fluid because it resists freezing.
What type of collector is best for high-temperature applications?
Evacuated tube collectors are more efficient at retaining heat, suitable for higher temperatures.
What component circulates fluid in an active solar thermal system?
A pump is used to move the heat transfer fluid between the collector and storage.
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Which system does not require electrical components?
Passive solar thermal systems rely on natural convection and gravity to move fluids.
What is the purpose of an expansion tank?
An expansion tank allows for fluid volume changes as temperatures fluctuate, preventing system damage.
Why is system insulation important in solar thermal installations?
Insulation reduces heat loss in pipes and tanks, improving system efficiency and performance.