Heat Exchangers # 1
Heat Exchangers
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| Answer: c Explanation: In the given plot, we can observe the temperature has three elbows, that means it takes three turns(4 tubes) while its temperature increases in the tube side while its shell side observes only one turn(2 sections). Hence we can easily infer from this that it is a 2-4 shell and tube HE. | Which type of Shell and tube heat exchanger does the below temperature plot correctly represent? a) Single Pass Shell and Tube b) 1-2 Shell and Tube c) 2-4 Shell and Tube d) 3-6 Shell and Tube |
| Answer: a Explanation: The diagram for a 2-4 Shell and Tube HE is as shown, we can observe that it has a partition in the shell side dividing it into two parts and four passes of the tube, two in one shell part and the rest in the other two. | What can we infer from the name 2-4 Shell and Tube Heat Exchanger? a) Partition of the Shell into two and four passes of the tube b) Partition of the Shell into two three passes of the tube c) One Shell and Four pass of the tube d) Partition of the Shell into three four passes of the tube |
| Answer: d Explanation: In the provided figure, we see six passes for the tube (looking at the junctions and stops) and 2 partitioning walls present in the shell which divides it into three parts, hence the shown fig is a 3-6 Shell and Tube HE. | Recognize the given Shell and Tube Heat Exchanger a) 1-2 Shell and Tube b) 2-3 Shell and Tube c) 2-4 Shell and Tube d) 3-6 Shell and Tube |
| Answer: d Explanation: When we have MC×CC<MH×CH then the temperature profile shows a concave downward curve with the temperature of the hot fluid first slowly decreasing then rapidly falling as perfectly represented in the figure. | Which one of the following figures correctly represents counter-flow operation of a shell and tube heat exchanger with the specific heat of fluid in the shell side more than the fluid in the tube side? |
| Answer: a Explanation: In a shell and tube heat exchanger we can use baffles to increase turbulence in the flow which eventually increases the pressure drop in the equipment. | Use of baffles in shell and tube Heat exchangers increases pressure drop. a) True b) False |
| Answer: c Explanation: On the basis of flow patterns, shell and tube HE can be classified as m-n shell and tube pass, split flow and divided flow. | In how many ways can we classify Shell and Tube heat exchangers on the basis of flow patterns? a) 1 b) 2 c) 3 d) 4 |
| Answer: a Explanation: The mean temperature difference for a counter-flow operation is uniform throughout the length of the tube and hence gives a higher value to the LMTD. | Which of the following has the maximum Log mean temperature difference for a Shell and tube Heat Exchanger? a) Counter-flow b) Parallel Flow c) Cross Flow d) Split Flow |
| Answer: c Explanation: There exist only three possible baffles to be used in a shell and tube heat exchanger which are Orifice baffle, segmental baffle and doughnut baffle. | What are the types of baffles exist for a shell and tube heat exchanger? a) Cross baffle, Split baffle and segmental baffle b) Counter baffle, doughnut baffle and Cross baffle c) Orifice baffle, segmental baffle and doughnut baffle d) Orifice baffle, segmental baffle and Counter baffle |
| Answer: d Explanation: There exist only three possible baffles to be used in a shell and tube heat exchanger which are Orifice baffle, segmental baffle and doughnut baffle. | Which one of the following is not a type of baffle for heat transfer in shell and tube HE? a) Segmental b) Orifice c) Doughnut d) Divided |
| Answer: b Explanation: There exist only two possible pitch types to be used in a baffle for shell and tube heat exchanger which are Square pitch and Triangular pitch. | What are the types of pitch arrangements are available for the baffles to be used in Shell and Tube HE? a) Square pitch and Rectangular pitch b) Square pitch and Triangular pitch c) Rectangular pitch and Hexagonal pitch d) Hexagonal pitch & Triangular pitch |
| Answer: a Explanation: When phase change takes place we keep that fluid in the shell side so that the condensate can be readily removed and further process can be continued without halt which is not the case when we use it in the tube side. | When phase change occurs in one of the fluids, it is preferred to be kept at the shell side. a) True b) False |
| Answer: c Explanation: The fluid with very high pressure is usually avoided in shell side as it may damage the baffles and resting tubes. For shell side order of priority is- i. Condensing stream(non corrosive) ii. Large temperature fluids iii. Large viscosity fluids. | Which one of the following fluid cannot be placed in the shell side? a) Condensing Vapour b) Fluid with very high temperature c) Fluid with very high pressure d) Fluid with high viscosity |