Heat pump performance: COP magnitude relative to unity Complete the statement about a heating-mode device: “The coefficient of performance (COP) of a heat pump is always ___ one (for normal operation).” Choose the correct completion.
Mechanical Engineering
Heat Transfer, Refrigeration and Air Conditioning
Difficulty: Easy
Choose an option
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Aless than
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Bequal to
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Cgreater than
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Dunpredictable and may be less than or greater than
Answer
Correct Answer: greater than
Explanation
ConceptCOPHP = QH/W = 1 + QL/W = 1 + COPRef > 1 for any functioning heat pump, since some of the delivered heat is the absorbed heat plus the input work.
Final Answergreater than.