Read the passage: 'Subsurface ground source heat pumps extract solar thermal energy stored in shallow bedrock, circulating glycol fluid to provide space heating in winter and passive cooling during summer.' What enables this technology to operate efficiently year-round?
Answer and explanation
Correct answer: D. The relatively stable temperature of bedrock below the frost line
- Step 1: Bedrock below the frost line maintains a nearly constant temperature year-round, serving as a heat source in winter and a heat sink in summer. Step 2. Select stable bedrock temperature below the frost line. Answer: The relatively stable temperature of bedrock below the frost line. Why not the others: Deep bedrock is shielded from direct sunlight; no shale gas combustion is involved; groundwater is not boiled.
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