STUPIDSID
1(a)
How do noncondensables affects condenser operation?
5 M
1(b)
List gasket materials used in plate heat exchanger with their respective applications
5 M
1(c)
What , if fouling is not considered while exchanger design?
5 M
1(d)
Explain the working of kettle type reboiler with neat sketch.
5 M
2
There is a requirement to cool 160,000 Kg/hr of a ethanol from 70°C to 30°C. Cooling water will be used for cooling, with inlet and outlet temperature of 20°C and 60°C. Design a gasketed-plate heat exchanger for this duty with stainless steel(k=15 W/mK) Plates of 0.5mm thick. Maximum operating pressure and allowable pressure for both fluids is 2 bar and 0.6 bar respectively and maximum permissible velocity is 3 m/s. Show one iteration of design calculation including thermal and hydrodynamic and if design is not satisfactory in lirst iteration then comment on the calculations?
Data:
Data:
| Property | Cooling water | Ethanol |
| Specific heat, KJ/Kg.k | 4.179 | 2.46 |
| Viscosity, cP | 0.705 | 0.67 |
| Thermal conductivity, /m.k | 0.62 | 0.171 |
| Density, Kg/m3 | 995 | 772 |
20 M
3(a)
Explain working of horizontal reboiler with schematic sketch.
12 M
3(b)
Explain operation of barometric condenser.
8 M
4(a)
What are the factors to be considered for allocation of fluid in shell or tube?
12 M
4(b)
Explain use of sealing strips in shell and tube exchanger.
4 M
4(c)
How do overdesign influence operation of heat exchanger like condenser, reboiler and coolers?
4 M
5
A shell and tube heat exchanger has the following configration:
The shell side fluid is a hot water (mass flow = 7500 kg/hr) with the following properties:
Using Bell-Delaware method, calculate the shell side heat transfer coefficient for following data.
The shell side fluid is a hot water (mass flow = 7500 kg/hr) with the following properties:
| Specific heat, kcal/Kg.K | 4.3706 |
| Thermal conductivity, W/m.K | 0.5787 |
| Viscosity, cP | 0.3307 |
| Specific gravity | 0.9673 |
Using Bell-Delaware method, calculate the shell side heat transfer coefficient for following data.
| Number of tubes | 34 |
| Shell Inner Diameter | 279.401 mm |
| Bundle diameter | 254.88 mm |
| Tube outer diameter | 25.4 mm |
| Sealine strips | None |
| Pitch 1.25Δ | 31.75 mm |
| No. of baffles | 35 |
| Baffle spacing (centre to centre) | 75 mm |
| Baffle cut | 24.48% |
20 M
6(a)
9150 kg/hr of saturated cyclohexane vapour will be condensed at 83.33°C and 1.1.0 bar using a tube bundle containing 147 tubes arranged for single pass. The tubes are 1 inch. Outer diameter 14 B WG thickness with a length of 6096 mm. Calculate the condensing side coefficient for the tube bundle is condense with condensation over tube, and comment on result.
Data:
Data:
| Density of condensate, kg/m3 | 791.0 |
| Viscosity, cP | 0.3311 |
| thermal conductivity, W/m.K | 0.1512 |
| Specific heat, KJ/kg.K | 2.1562 |
16 M
6(b)
Explain operation of reflux condenser.
4 M
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