Chemical Engineering Shell And Tube Heat Transfer

2758 words - 12 pages

Horizontal Shell and Tube Heat Exchanger


















Table of Contents:

Nomenclature. Pg. 3
Introduction and Background Pg. 4
Experimental Methodology
Equipment and Apparatus Pg. 6
Experimental Procedures Pg. 7
Results Pg. 8
Analysis and Discussion……………………………………………………………………..Pg. 11
Summary and Conclusions Pg. 12
References Pg. 13
Appendices Pg. 14

Nomenclature
Symbol | Term | Units |
A | Heat transfer surface area for the tubes | Inches2 (in2) |
Cp | Heat Capacity | J/(mol*K) |
F | Correction Factor | __ |
| Heat | W |
c | Cold Side Heat Duty | W |
H | Hot Side Heat Duty | W |
Shell Side ...view middle of the document...

Shell-and-tube heat exchangers are the most versatile heat exchangers, made from a variety of metal and nonmetal materials and range in size from 1 ft2 to 106 ft2 surface area [1]. Shell-and-tube heat exchangers are designed for practically any operating conditions or capacity, ranging from no pressure to ultra-high pressures and from low to high temperatures. Different materials of construction are the only limitation to temperature and pressure differences between the fluids [1]. They can be designed for various operating conditions such as erosion, corrosion, toxicity, radioactivity, and vibration.
A shell-and-tube heat exchanger has tubes running through a cylindrical shell, parallel to the shell. While one fluid runs through the inside of the tubes, the other runs along the outside. This allows for heat transfer without mixing of the fluids [1]. As the cold fluid flows within the tubes, heat is transferred from the hot fluid to the cold, creating a temperature change. The more tube-side passes there are within the shell, the more efficient the heat transfer [1].
Shell-and-tube heat exchangers are widely used in industry. They can be used as process heat exchangers in petroleum-refining and chemical industries; as steam generators, condensers, boiler feed water heaters, and oil coolers in power plants; as condensers and evaporators in air-conditioning and refrigeration processes; in waste-heat recovery applications; and in environmental controls.
A small shell-and-tube heat exchanger was used during this lab. The effects of increasing the tube-side flow rate and shell-side flow rate on the heat duties of cold and hot sides were analyzed, including the heat transfer coefficient. The effects of different cold side flow rates while maintaining the hot side flow rate on the outlet temperatures of the both streams were analyzed. Similarly, the cold side flow rate was maintained with varying hot side flow rates to determine the effects of these conditions on the outlet temperatures of the streams. The results of both of these conditions were recorded and used to assess the heat duties of the hot and cold side as well as the heat transfer coefficient.


2.0 Experimental Methodology
3.1 Equipment and Apparatus
Figure 2. Chiller
Figure 2. Chiller
Pump
Pump
Heat reservoir
Heat reservoir
Small shell heat exchanger
Small shell heat exchanger
Cold flow out
Cold flow out
Cold flow valve
Cold flow valve
Cold flow in
Cold flow in
Hot flow valve
Hot flow valve
Thermocouple
Thermocouple
Hot flow in
Hot flow in
Hot flow out
Hot flow out
Figure 1. Heat Exchanger
Figure 1. Heat Exchanger
Chiller
Chiller
Water
storage tank

Water
storage tank

Cooling
radiator
Cooling
radiator

Lab View
Lab View
Figure 3. Lab View Program
Referring to Figure 1, there are two inlet streams and two outlet streams for the small shell-and-tube heat exchanger. These streams are specifically labeled as hot flow...

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