Exhaust gases flowing through a double-pipe heat exchanger at a rate of 0.3 kg/s to be cooled from 400°c to 120°c by water in the annulus initially at 10°c. the inner pipe has a diameter of 33 cm and negligible thickness. the specific heat capacities of the gases and water may be taken as 1130 and 4190 j/kgk respectively, and the gas and water heat transfer coefficients are 150 and 665 w/m2k. find the heat exchanger length required when the cooling water flow is 0.4 kg/s, (a) for parallel flow and (b) for counter flow.

explanation:

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the equation above shows how temperature f, measured in degrees fahrenheit, relates to a temperature c, measured in degrees celsius. based on the equation, which of the following must be true?

a temperature increase of 1 degree fahrenheit is equivalent to a temperature increase of

5

9

degree celsius.

a temperature increase of 1 degree celsius is equivalent to a temperature increase of 1.8 degrees fahrenheit.

a temperature increase of

5

9

degree fahrenheit is equivalent to a temperature increase of 1 degree celsius.

a) i only

b) ii only

c) iii only

d) i and ii only

answer:

ya

explanation:

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answer:

200k

explanation: