Exam-style question
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Define the coefficient of performance (COP) for a heat pump and explain its significance in evaluating the efficiency of the system.
Model answer
What a good answer should say
- The coefficient of performance (COP) for a heat pump is defined as the ratio of the heat output (Qh) to the work input (W) required to transfer that heat.
- It is given by the formula COP = Qh / W.
- A higher COP indicates a more efficient heat pump, as it delivers more heat energy for each unit of work input.
Explanation
Why this works
This question tests the understanding of the concept of COP and its role in assessing the efficiency of heat pumps. A strong answer clearly defines COP and relates it to practical implications, demonstrating comprehension of thermodynamic efficiency.
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