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In a counter flow heat exchanger, hot fluid enters at 170°C & leaves at 150°C, while the cold fluid enters at 50°C & leaves at 70°C. The arithmetic mean temperature difference in this case is __________ °C. | |
A. | 20 [Wrong Answer] |
B. | 60 [Wrong Answer] |
C. | 120 [Wrong Answer] |
D. | ∞ [Correct Answer] |