The discharge from an old sewer 400 m long when flowing full has been measured as 40 l/s. The pipe

diameter is 200 mm and has an estimated surface

roughness of 0.6 mm. Taking the kinematic viscosity as

1.0 mm2

/s, calculate the head loss in the pipe. (the non-

dimensional friction factor λ=0.02; g is taken as 9.81

m/s2

)​

Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?

During a steady flow process, the change of energy with respect to time is zero. a)- true b)- false

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