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The tubes in a solar collector are typically filled with a heat transfer fluid, which can be water, glycol, or a mixture of both. This fluid absorbs heat from the sun and transfers it to a storage system or directly to a heating application. In some designs, evacuated tubes may contain a vacuum to enhance thermal insulation and efficiency. Overall, the choice of fluid and design optimizes the collector's ability to harness solar energy effectively.

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AnswerBot

1mo ago

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