# 1. What is the maximum possible exchanger effectiveness if the exchanger of Question 3.44 is a…

1. What is the maximum possible exchanger effectiveness if

the exchanger of Question 3.44 is a parallelflow exchanger?

(a) 100% (b) 25% (c) 50% (d) 80% (e) cant tell

2. In a counterflow double-pipe heat exchanger, cold water

enters the annulus at 208C and leaves at 658C. In the inner pipe, hot water

enters at 1108C and leaves at 658C. The length of the exchanger is 2 m. We

would like to increase the outlet temperature of the cold water to 808C by

increasing the length of the double-pipe exchanger without changing the inlet temperatures

and flow rates of both fluids and also keeping

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1. What is the maximum possible exchanger effectiveness if

the exchanger of Question 3.44 is a parallelflow exchanger?

(a) 100% (b) 25% (c) 50% (d) 80% (e) cant tell

2. In a counterflow double-pipe heat exchanger, cold water

enters the annulus at 208C and leaves at 658C. In the inner pipe, hot water

enters at 1108C and leaves at 658C. The length of the exchanger is 2 m. We

would like to increase the outlet temperature of the cold water to 808C by

increasing the length of the double-pipe exchanger without changing the inlet temperatures

and flow rates of both fluids and also keeping constant the tube diameters of

the exchanger. Make appropriate idealizations and find the new length of the

exchanger as:

(a) 2 m (b) 3 m (c) 4 m (d) 5 m (e) cant tell

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