The air source heat pump water heater uses air as a cryogenic substanceAir source heat pump water heater with air is used as low temperature material, through the medium (material) to absorb heat in the air, and the use of heat pump technology (similar to the working principle of a small refrigerator) electricity consumption can drive the compressor, the medium high temperature material and become heat cold water. The heat pump water heater with high efficiency and energy saving, has the advantages of no the weather and so on, has been included in the national Torch Program. The promotion of water heater in the vaporization and exothermic absorptionA. at cryogenic substances, the medium absorbs heat from the air, B. at the cryogenic material, and the air absorbs heat from the mediumC. at high temperature material, medium absorbs heat from cold water, D. at high temperature material, cold water absorbs heat from mediumThe standard answer is A, why isn't D right?
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However, the subject is somewhat doubtful: instead of using air as a cryogenic substance, it uses air as a low grade heat source
A is right, and D should be right. If you want to be wrong, estimate the examiner's thinking is hot water, he thinks it's hot water
