Question: In the parallel - current flow heat exchanger, water is used to cool the oil. The temperature of entering water and leaving water are 1

In the parallel

-

current flow heat exchanger, water is used to cool the oil. The temperature of entering water and leaving water are

15 C

and

40 C,

respectively. While the temperature of entering and leaving oil are

150 C

and

100 C,

respectively. When production conditions vary, the leaving temperature of the oil must go down to

80 C .

Suppose that the mass flow, the entering temperatures and the physical properties of fluids are the same as the former. If the tube length of the former heat exchanger is

1 m,

how long has the tube to be increased to meet the production requirement? The heat loss of the heat exchanger can be ignored.

Solution:

In the parallel-current flow heat exchanger, water is used to cool

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