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2 . A counterflow heat exchanger is used to transfer heat from a hot fluid at 1 2 0 deg C to a cold

2 .

A counterflow heat exchanger is used to transfer heat from a hot fluid at

120 \\

deg C to a cold fluid at

40 \\

deg C

.

The hot fluid enters the exchanger at a flow rate of

0.2

/

s and leaves at

80 \\

deg C

.

The cold fluid enters the exchanger at a flow rate of

0.1

/

s and leaves at

60 \\

deg C

.

The overall heat transfer coefficient is

500

/

^2

,

and the area of the heat exchanger is

10

^2 .

Neglecting any heat loss to the surroundings and assuming that both fluids have constant specific heats of

4.18

/

,

determine:A

)

The NTU

(

Number of Transfer Units

)

)

The heat capacity rate ratio

(

Cmin

/

Cmax

)

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