8/16/2019 Computer Aided Process Engineering_2013.pdf

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Y INDIAN

INSTITUTE

OF

TECHNOLOGY, KHARAGPUR

' DEPARTMENT

OF

CHEMICAL ENGINEERING

END SEMESTER EXAMINATION 2012-13 (SPRING) i

Computer Aided Process Engineering (CH30016)

NAME: ollNo:

I

I

I HI

r 1

I

I

Answer

Q-1

and any

Four

questions from the rest. 'Fime: 3 hr. No:

of students=

87

SubmiHhis

Sheet duly filled in along with the Answer Book FULL MARKS - 50

1 From the (AT

min

10 °C) following Stream table , find out

Stream Type CP T

5

Tt

kW/

°C) (°C)

ec)

1 Cold 20 30

145

2. Hot 30 180 70

3 Cold

40 90

150

4 Hot

15

160 70

(a) Pinch temperature

I

(b)

Minimum Cold Hot utilities requirement

I

(c) Place the Heat Exchanger matches taking the above and below the Pinch process

separately and then combine them for the overall design for maximum energy

recovery (MER). Assume availability

of

Cooling water: T

5

=

30 °C,

Tt:;:::

40°C,

'and

Steam (saturated): T = 258 °C. Fill up the all the data into following tabular format:

T h,in T h,out T c,in T

c,out

6H

HEl

HE2

HE3

HE4

HES

Heater

Cooler

.

(d) What do you mean by Loop and Path

?

Identify the Loop across the Pinch,

break it by relaxing energy along a Path , thereby reducing

one he t exch nger

unit from the above MER design. [2+2+5+5 =

14]

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2. Develop the information flow diagram

of

a lumped parameter model

of

a

distillation column by taking the Tray , Condenser and Reboiler'Y as three

separate modules. Define the variables clearly and state all the assumptions while

developing the mathematical equations.

[9]

3. (a) What do you mean by SLM and WDV method

of

Depreciation

of

capital

assets In,a Factory, a machine has been purchased with an initial cost

ofRs

20

• Lac.

I t

has an estimated life

of

5 years and a scrap value

of

Rs 5 Lac. Show the

calculation

of

year-wise depreciation and book value both by S ~ and WDV

method.

(b) While working on an investment decision, what do you

me an

by ROI,

NPV, and IRR ?

(c) A gold processor has two sources

of

gold ore, source A and source B In

order to keep his plant running, at least three tons

of

ore must be processed each

day. Ore from source A costs Rs 20,000 per ton to process, and ore from source B

costs Rs 10,000 per ton to process. Costs must be kept to less than Rs 80,000 per

day. Moreover, Govt. Regulations require that the amount

of

ore from source B

cannot exceed twice the amount

of

ore from source A.

If

ore from source A yields

2 oz.

of

gold per ton, and ore from source B yields 3 oz.

of

gold per ton, how

many tons

of

ore from both sources must be processed each day to maximize the

amount

of

gold extracted subject to the above constraints?

[3 3 3 = 9]

4.

n

exothermic reaction is taking place in a jacketed CSTR. Develop a Fuzzy

Logic based control system to manipulate the jacket water flow-rate depending on

the Feed and Reactor temperature. Show with sample calculations clearly

highlighting the fuzzification, rule evaluation and defuzzification process. What

is MIN-MAX process

of

rule evaluation?

[9]

5. Using error back propagation algorithm, show how the weights are adjusted for

a 2 Input X 2 Hidden X 1 Output - node ANN system used to train an XOR truth

table. Show one set of complete calculations. Use sigmoidal function as the

activation function in the nodes

of

Hidden and Output layer. What is learning

rate and momentum factor ? [9]

6.

Develop a distributed parameter model for a counter-current double pipe heat.

exchanger having the hot fluid in the inside pipe. Define all the variables and state

all the assumptions clearly. Comment on the solution strategy

of

such model

equations. [9]

NOTE: Do not ask any question at the Examination Hall. If in doubt, make suitable assumptions and proceed.

Handwriting and figures should be neat Parts of a question should be answered together, in one place.