ABSTRACT
The exchange of heat is one of the most important
processes in the chemical industry and the Shell and tube heat exchanger is the
major equipment used to transfer heat from one medium to another. This research
project work on the Computer Aided Design (CAD) of shell and tube heat
exchanger with double passes aims to provide an easy way to design shell and
tube heat exchangers. A case study question was given and all the necessary
calculations in the thermal design are carried out using Kern’s method of heat.
exchanger design. The thermal design is then used as a guide to the computer
aided design using computer codes.
The computer software program used is the most recent
version of Visual Basic called Visual Basic NET (VB.NET) because of its
numerous advantages over the other software programmes. The result gotten from
the computer aided design was compared to the result from the thermal design.
The computer aided design software was equally used to test other problems on
shell and tube heat exchanger.
Because the computer aided design was found to be more
accurate, quicker and more efficient, it was recommended for use in companies
and industries.
CHAPTER 1
1.0 INTRODUCTION
Heat Exchangers are specialized devices that assist in the
transfer of heat from one fluid to the other. In some cases, a solid wall may
separate the fluids and prevent them from mixing. In other designs, the fluids
may be in direct contact with each other. In the most efficient heat exchangers
the surface area of the wall between the fluids is maximized while
simultaneously mixing the fluid flow resistance. Fins or corrugation are
sometimes used with the wall in order to increase the surface area and to
induce turbulence. There are three primary flow arrangements with heat
exchangers: Counter-flow, Parallel flow and Cross flow.
The most common type of heat exchangers used in the
process, petroleum, chemical and HVAC industries intended for heating process
fluids is Shell and Tube Heat Exchangers. Shell and tube heat exchangers are
used when a process requires large amounts of fluids to be heated or cooled.
Due to their design, they offer a large heat transfer area and provide high
heat transfer efficiency. They consist of tubes and shells. The tubes act as
the flow channels for one of the fluids in the heat exchanger, these exchangers
are often parallel in order to provide a large surface area for the heat
transfer. The shell on the other hand holds the tube bundle and acts as the
conduit for the fluid. The shell assembly houses the shell side connections and
is the actual structure in to which the tube bundle is placed.
Shell and tube heat exchangers are used in applications
where the pressure and temperature demands are high. They serve a wide range of
applications in compressor system, hydraulic system, stationary engines, pain
systems, air dryers, lube oil consoles and several marine applications.
AIM:
Design and development of software for solving shell and
tube heat exchanger with double passes.
OBJECTIVES:
-
To design a one shell pass and two
tubes pass heat exchanger using Basic design Procedure and theory
-To
investigate the true counter current flow in double pass heat exchanger as
compared to other passes of heat exchanger.
-
To develop software for solving
shell and tube heat exchanger and other forms of heat exchanger.
1.2 SCOPE
OF THE STUDY
This study is intended to
focus on the design and development of software for solving heat exchangers
with double passes. The index of studying the heat exchanger includes:
-
The Basic design procedure and theory
for the shell and tube heat exchanger
With
one shell pass and two tube passes.
Solving problems in shell and
tube heat exchanger using a software/ computer programming language Visual
Basic (NET)
The factors affecting
performance of shell and tube heat exchanger and the pattern of flow of the
streams/fluids in them.
Their
functions and general applications in Engineering.
1.3 SIGNIFICANCE
OF THE STUDY
Anyone who wants to use a heat exchanger faces a
fundamental challenge, fully defining the problem to be solved which requires
an understanding of the thermodynamic and transport properties of fluid. Such
knowledge can be combined with some simple calculations to define a specific
heat transfer problem and select an appropriate heat exchanger.
Heat exchangers serve as straight forward purpose
controlling a system’s or substance’s energy. Although there are many different
sizes, levels of sophistication and types of heat exchangers, they all use a
thermally conducting tube or plate to separate two fluids such that one can
transfer thermal energy to the other.
This study thereby necessitates the need for the design
and development of software for which will lead to near maximum performance of
a heat exchanger.
Finally, the data obtained from this procedure shows that
a one shell-pass and two tube-pass heat exchangers is more efficient than most
heat exchangers in fluids thermal conductivity and transfer combustion.
================================================================
Item Type: Project Material | Size: 70 pages | Chapters: 1-5
Format: MS Word | Delivery: Within 30Mins.
================================================================
No comments:
Post a Comment
Note: Only a member of this blog may post a comment.