A countercurrent heat exchanger operates with Steve Gibbs @The Thermal

Question 1 / 33: 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

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Explanation:

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

Quiz Home Page

https://www.jobilize.com/thermal-fluid-systems-mcq-quiz-by-dr-steve-gibbs

Thermal-Fluid Systems ME303

Author:

Dr.Steve GibbsProfessor

The Saylor Foundation

USA

Access: Public Instant Grading

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

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