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Code No: NR410803
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IV B.Tech I Semester Supplimentary Examinations, May/Jun 2009 CHEMICAL ENGINEERING PLANT DESIGN (Chemical Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. Write the important factors to be considered for the design of chemical equipments like distillation columns, heat exchangers, etc. [16]
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2. Give a detailed description of maintaining accounting records and cost accounting methods. [16] 3. (a) What is six-tenths-factor rule? Where is it used?
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(b) The purchased and installation costs of some pieces of equipment are given as a function of weight rather than capacity. An example of this is the installed costs of large tanks. The 1980 cost for an installed aluminum tank weighing 100 kg was Rs. 3,90,000. For a size range from 200 to 1000 kg, the installed cost-weight exponent for aluminum tanks is 0.93. If an aluminum tank weighing 700 kg is required, what is the present capital investment needed? [10]
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4. (a) Write short notes on profitability.
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(b) Explain in detail about the design-engineering practice for interest and investment costs. [8] 5. Describe the different types of taxes with reference to any industrial process. [16] 6. (a) What is sinking fund method for the determination of depreciation?
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(b) Derive an equation for asset value of equipment after few years of use by the application of sinking fund method. [6]
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(c) Compare sinking fund method with straight-line method.
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7. A company has to purchase one distillation column to be used in a product purification process. Four designs are available, all equally capable of separating the components. Data is as follows: Design 1 2 3 4 Fixed capital investment 15,00,000 18,00,000 21,00,000 24,00,000 Sum of fixed costs and operating Cost per year (all other cost are constant) 4,50,000 4,20,000 3,52,500 3,15,000 If the concern demands at least 15 per cent return on any unnecessary investment, which of the four designs should be accepted? [16]
8. (a) Derive an expression for determing the optimum coolant temperature in a cooler assuming that the total cost is made-up of the operating cost (the 1 of 2
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Code No: NR410803
coolant and pumping cost) and Capital Cost (may be considered to be proportional to the Heat transfer Area).
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(b) An Organic Liquid is to be cooled from 75 to 55 C in a shell and tube unit using cooling water available at 25 C. The plant operates 300 days an year. The water cost, including pumping is estimated to be Rs.l.0/m3 . The installed cost of the Exchanger is Rs.l,000 per m2 and it is to be depreciated over 8 years. Assume interest, maintenance and Fixed charges amount to 15% of the installed cost per annum and a suitable value for overall coefficient. Find optimum water out-let temperature. [8]
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