题目内容
To enhance the single-phase forced convection heat transfer on the air side, the commonly used methods generally do not include:
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Which of the following is not an effective measure to enhance heat transfer?
The hot fluid A is used to heat oil in a heat exchanger. The inlet and outlet temperature for A is 300℃ and 200℃, and the oil is heated from 25℃ to 175℃, so the downstream logarithmic mean temperature difference of the two fluid is ?
The hot fluid A is used to heat oil in a heat exchanger. The inlet and outlet temperature for A is 300℃ and 200℃, and the oil is heated from 25℃ to 175℃, so the upstream logarithmic mean temperature difference of the two fluid is ?
A double-pipe heat exchanger is used to cool oil. Cold water flows through the small pipe, while oil flows through the outside of the samll pipe. The oil is cooled from 107℃ to 32℃, while the water is heated from 17℃ to 60℃, so the logarithmic mean temperature difference is?
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