Consider Problem 11.36. (a) For m c,A = m h ,B = 10kg/s, determine the outlet air

Question:

Consider Problem 11.36.
(a) For mc,A = mh,B = 10kg/s, determine the outlet air and ammonia temperatures, as well as the heat transfer rate.
(b) Plot the outlet air and outlet ammonia temperatures
versus the water flow rate over the range 5 kg/s ≤ mc,A = mh,B ≤ 50kg/s.


Data From Problem 11.36

Consider a coupled shell-in-tube heat exchange device consisting of two identical heat exchangers A and B. 

Air flows on the shell side of heat exchanger A, entering at Th,i,A = 520 K and mh,A = 10kg/s. Ammonia flows in the shell of heat exchanger B, entering at Tc,i,B  = 280 K, mc,B = 5kg/s. The tube-side flow is common to both heat exchangers and consists of water at a flow rate mC,A = mh,B with two tube passes. The UA product increases with water flow rate for heat exchanger A as expressed by the relation UA=  a + bmc,A where a = 6000 W/K and b = 100 J/kg · K. For heat exchanger B, UA= 1.2UAA.

(a) For mc,A = mh,B = 1kg/s, determine the outlet air and ammonia temperatures, as well as the heat transfer rate.
(b) The plant engineer wishes to fine-tune the heat exchanger performance by installing a variable speed pump to allow adjustment of the water flow rate. Plot the outlet air and outlet ammonia temperatures versus the water flow rate over the range 0kg/s ≤ mc,A = mh,B ≤ 2kg/s. 


Fantastic news! We've Found the answer you've been seeking!

Step by Step Answer:

Related Book For  book-img-for-question

Fundamentals Of Heat And Mass Transfer

ISBN: 9780470501979

7th Edition

Authors: Theodore L. Bergman, Adrienne S. Lavine, Frank P. Incropera, David P. DeWitt

Question Posted: