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1. You find yourself working on a coal hydrogenation process where coal is treated with
hydrogen to make liquid hydrocarbons. It is desired to Ere-heat the hydrogen from ggg
to 175C before it enters the reactor. You are given the task of designing the exchanger for
this job. Being an industrious and cost-conscious employee, you go to the storeroom and
find a brand new double-pipe heat exchanger made of 316 stainless steel (a real find!).
The exchanger is made of %-inch schedule 40 pipe inside a 2-inch schedule 40 shell. It
consists of 2 sections in series @ 15 ft long. You decide to put the hydrogen on the
tube side and heat the shell with steam at 200C. The heat transfer coefficient on the
steam side is taken to be 2500 W/m2 C. What is the maximum flow rate of hydrogen (in
kg/hr) that can be heated with this exchanger? You can refer to the data below and the
attached table for the physical properties of hydrogen. Pipe dimensions: 3/4” schedule 40: OD = 1.050 inch; ID = 0.824 inch
2” schedule 40: OD = 2.375 inch; ID = 2.067 inch
Thermal Conductivity of stainless steel = 54 W/m C Hint: To begin your calculation, you can assume the flow of hydrogen is turbulent, but
be sure to verify it to be certain.

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