• Card 2 / 35: A countercurrent heat exchanger operates with the following temperatures: cold fluid inlet 15°C, cold fluid outlet 25°C, hot fluid inlet 90°C, and hot fluid outlet 30°C. Calculate the logarithmic-mean temperature difference in °C.
    A) 45°C
    B) 30°C
    C) 27°C
    D) 25°C
    E) 50°C

    Answer:
    C) 27°C

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Explanation:

The temperature differences at the termini are ΔT1 = 90-25 = 65 °C and ΔT2=30-15 = 15 °C. Hence,ΔTlm = ΔT1- ΔT2/ln(ΔT1/ ΔT2)= 27.3 °C.

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Thermal-Fluid Systems ME303

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Attribution:  Dr. Steve Gibbs. Thermal-Fluid Systems. The Saylor Academy 2014, http://www.saylor.org/courses/me303/
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