Pressure-enthalpy chart is useful in refrigeration. The change in internal energy of an ideal fluid used in ideal refrigeration cycle is_____________________?
Correct answer: C. Zero
- A. Positive
- B. Negative
- C. Zero
- D. Infinity
Explanation
Over a complete ideal refrigeration cycle, the working fluid returns to its initial state, and internal energy is a state function. Hence its net change in internal energy is zero, even though it changes during individual processes.
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