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QUESTION 3 [25 MAR In a chemical heat 373. a) Determine Surface a a and tube heat exchanger is mounted of y of 2450 J/kg-K before it is puno Orizontally a Wm-K. The heat exchanger is used up the reactant is saturated steam at 101.35 kPa From the past experience, are 1550 W/m² K and has 85 tubes in schedule 40 reactant side with fouling coeffi nsfer coefficient values at the reactant a W/m².K, respectively. During the operat and tubes. of 5600 W/m² K is expected. he he Each pipe) with thermal of reactant with reactor. The heating medium on the outside of t heat heat team sides on the deposici transfer coefficient of this heat exchanger based on the outer
b) Determine the length, mean temperature diffee hear exchanger to achieve the desired heating by by using log method.
c) In gas is ter is generated regulary from tap wat natural as is eded in the process and the cost of amount of or by a natural gas furnace. t the year. The is about 31.2°C. In order to save energy in producing the hot water, an water-to-water heat exchanger to saturated steam. By assuming the new heat exchanger will recover maximum possible condensate, and the plant operates 320 day/year, f heat from annually saving money on natural gas due to this new installed heat ex. mine the suggests to install a new from the heat the tap water by the formed condensate
Steam at saturation temperature Figure 2 Steam at saturation temperature Reactant at 65°C Reactant at 18°C
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