Question

A shell and tube heat exchanger with one shell pass and one tube pass will be used to condense the steam to saturated liquid, which enters the shell side as a saturated vapor at 400 K. The tube side contains R-134a refrigerant with an inlet temperature of 300 K and a mean velocity of 0.4 m/s. The steam flow rate is 1.5 kg/s. The tubes are made from AISI 302 stainless steel and have a 1" nominal diameter (Di = 26.6 mm and Do = 33.4 mm). The heat transfer coefficient at the outer surface of the tubes is ho = 10,000 W/m ^2 K. Assume a fouling resistance of 0.0002 m ^2 K/W at the inside surface of the tubes and negligible fouling at the outside. a) If the coolant outlet temperature is not to exceed 320 K, what is the minimum allowable coolant flowrate? b) How many tubes are required to achieve the desired performance? c) What tube length is required? Please solve all the parts. Please do not skip any steps. Give the correct solution.

          A shell and tube heat exchanger with one shell pass and one tube
pass will be used to condense the steam to saturated liquid, which
enters the shell side as a saturated vapor at 400 K. The tube side
contains R-134a refrigerant with an inlet temperature of 300 K and
a mean velocity of 0.4 m/s. The steam flow rate is 1.5 kg/s. The
tubes are made from AISI 302 stainless steel and have a 1" nominal
diameter (Di = 26.6 mm and Do = 33.4 mm). The heat transfer
coefficient at the outer surface of the tubes is ho = 10,000 W/m ^2
K. Assume a fouling resistance of 0.0002 m ^2 K/W at the inside
surface of the tubes and negligible fouling at the outside. a) If
the coolant outlet temperature is not to exceed 320 K, what is the
minimum allowable coolant flowrate? b) How many tubes are required
to achieve the desired performance? c) What tube length is
required?
Please solve all the parts. Please do not skip any steps. Give
the correct solution.

Added by Stephanie C.

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