Physics · Heat Exchangers

Under what condition can a counter-flow heat exchanger have an effectiveness of one?

Verified Solution4 OptionsUpdated: October 2026👁️1 View

1NTU < 1 and capacity ratio ≈ 1
2NTU < 1 and capacity ratio ≈ 0
3NTU > 5 and capacity ratio ≈ 1
4NTU > 5 and capacity ratio ≈ 0✓

Correct answer

NTU > 5 and capacity ratio ≈ 0

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