design of shell and tube heat exchanger by using chemcad simulation software v.7, this ppt helps to provide the basic knowledge of design with TEMA type heat exchanger. The heat exchanger is widely used in industries, this exchanger exchanges heat to get the desired temperature of output and efficient way to exchange heat between to liquids. This is based on NRTL MODEL

2.  The project aims to design a 1-2 shell and
tube countercurrent heat exchanger of two
fluids and maximizing its efficiency based
on NRTL model with the help of CHEMCAD
v.7 software.

3.  75000 lb/hr of ethylene glycol is heated
from 100 to 200F using steam at 250F.
Available for the series is a 17.25 in. ID
1-2 exchanger having 111 tubes 0.75
OD, 14 BWG, 16’00” long on 15/16-in.
triangular pitch. Baffles are spaced 7 in.
apart, and there are two tube passes to
accommodate the steam. What are the
pressure drops, and what is the dirt
factor?

4.  CHEMCAD enables us to meet the ever-
expanding needs of the chemical
engineering profession.
 CHEMCAD helps to enhance designs,
analysis, and computer aid simulations so
that it can drive productivity to our work
and organization.
 We used CHEMCAD version .7, the reliable
and updated software.

5.  Heat exchanger consists of a shell with a
bundle of tubes inside it. One fluid runs
through the tubes, and another fluid flows over
the tubes (through the shell) to transfer heat
between the two fluids. The set of tubes is
called a tube bundle, and may be composed of
several types of tubes: plain, longitudinally
finned, etc.

6.  The configuration gives a large surface
area in a small volume.
 Good mechanical layout: a good shape for
pressure operation.
 Uses well established fabrication
techniques.
 Can be constructed from a wide range of
materials.
 Easily cleaned.
 Well established design procedure.

7. Ethylene glycol
Steam (water)

8. SHELL SIDE DATA

15. SQUARE PITCH TRIANGULAR PITCH

16. SQUARE PITCH
 It is generally used for
fouling service and
systems in which available
pressure drop is low.
 The tube pattern is 90/45
degree.
 It is preferred for parallel
and counter flow heat
exchangers
 TRINGULAR PITCH
 It is generally used for
non-fouling service where
frequent cleaning of heat
exchangers are not
required.
 The tube pattern is 30/60
degree.
 It is the preferred
configuration for cross
flow system. For e.g
condensers.

19.  As we can observe from outcome data
that the pressure decreases in forward
direction of fluid flow and it lies within
the maximum range of 24 psi
 Due the presence of fouling factor in the
heat exchanger the effective area for heat
transfer decreases.
 There is linear increase in temp of cold
fluid along its length.

20.  For low pressure drop square pitch is
efficient than triangular pitch.
 Number of tubes in square pitch
decreases than in triangular pitch for the
same heat transfer.
 The cost of designing and operating a
heat exchanger decreases for square
pitch.
 Since the number of tubes is less in
square pitch the overall area of heat
exchanger is less.