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Total questions: 12
Worksheet time: 34mins
Refer to the Block Flow Diagram in Figure 1 and stream data in Table 1.
Identify a suitable equipment for unit A.
Heater
Pump
Evaporator
Condenser
Refer to the Block Flow Diagram in Figure 1 and stream data in Table 1.
Identify a suitable equipment for unit B.
Heater
Pump
Evaporator
Condenser
Refer to the Block Flow Diagram in Figure 1 and stream data in Table 1.
Identify a suitable equipment for unit C.
Heater
Pump
Evaporator
Condenser
The surrounding air temperature is about 25oC, hence there will be heat transfer along the pipeline from unit A to unit B.
Which of the following statement(s) is/are CORRECT?
To minimise heat transfer along pipeline, an insulation layer must be added.
Heat energy is transferred from stream 2 to the environment.
Heat energy is transferred from the environment to stream 2.
To minimise heat transfer along pipeline, increase the length of pipeline.
The rate of heat transfer from solution to surrounding air is governed by the following expression:
Q = UAΔT
Q: rate of heat transfer (W)
A: heat transfer area (m2)
ΔT: temperature difference between hot and cold fluid (K)
U: overall heat transfer coefficient
Which one of the following correctly represents the SI unit of U?
[U] =[m2][W][K]
[U] =[W]/[m2][K]
[U] =[K]/[m2][W]
[U] =[m2]/[W][K]
Refer to information provided in table 1, calculate the mass flowrate of stream 4 in kg/s.
Leave your answer in 3 d.p.
(Clue: All of the glycerol in stream 3 goes to stream 4)
(a)
Refer to information provided in Table 1 and Figure 1,
calculate the OVERALL mass flowrate of stream 5 in kg/s.
Leave your answer in 3 d.p.
(Clue: Recall your concepts on mass balance)
(a)
Unit B is a pump. Calculate the pressure increase across the pump and leave your answer in kPa.
(Clue: Recall your concepts absolute and gauge pressure. Use 1 bar = 105 Pa)
(a)
Stream 5 condenses completely into stream 6 after it goes through the condenser.
Calculate the VOLUMETRIC FLOWRATE of water vapour travelling through the pipe BEFORE entering the condenser.
Leave your answer in 3 d.p and in S.I. units.
(a)
Stream 5 condenses completely into stream 6 after it goes through the condenser. Calculate the VELOCITY of water vapour travelling through the pipe BEFORE entering the condenser.
Given that the pipe has a diameter of 3.6 cm.
Leave your answer in 1 d.p and in S.I. units.
(Clue: Recall formula of cross-sectional area of a cylinder)
(a)
Would the velocity in stream 5 be higher or lower than stream 6 if the pipe diameters are the same?
(Clue: Compare the density of the two streams)
Velocity in stream 5 is higher than stream 6
Velocity in stream 6 is higher than stream 5
Velocity in stream 5 is the same as stream 6
Calculate the mole percentage of water in stream 4 to confirm
if it meets the product specification of not more than 97%. Leave your answer in 1 d.p.
Molecular weight of water = 18 kg/kgmol
Molecular weight of glycerol = 92 kg/kgmol
(a)
