Chemical Engineering - Chemical Engineering Basics - Discussion

2. 

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
[B]. 60
[C]. 120
[D].

Answer: Option D

Explanation:

No answer description available for this question.

Ashok Kumar said: (Aug 22, 2016)  
= (170 - 70) / (150 - 50),

ln (100 / 100) is equal to infinity.

Romil Kikani said: (Feb 18, 2017)  
I think it is logarithmic mean, not an arithmetic mean.

Sk Jha said: (Apr 6, 2017)  
@Ashok

I don't think so.

AMTD = (170+150)/2 - (70+50)/2,
= 320/2 - 120/2,
= 160 - 60 = 100 Ans.

Tejprakash said: (Dec 26, 2017)  
Yes, I agree with you @Ashok.

Raj Musale said: (Sep 9, 2019)  
The answer is 100° C.

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