Heat Exchangers
DOE-HDBK-1018/1-93
TYPES OF HEAT EXCHANGERS
TYPES OF HEAT EXCHANGERS
In almost any nuclear, chemical, or mechanical system, heat must be transferred
from one place to another or from one fluid to another. Heat exchangers are used
to transfer heat from one fluid to another. A basic understanding of the
mechanical components of a heat exchanger is important to understanding how
they function and operate.
EO 1.1
STATE the two types of heat exchanger construction.
EO 1.2
Provided with a drawing of a heat exchanger, IDENTIFY the
following internal parts:
a.
Tubes
c.
Shell
b.
Tube sheet
d.
Baffles
EO 1.3
DESCRIBE hot and cold fluid flow in parallel flow, counter
flow, and cross flow heat exchangers.
EO 1.4
DIFFERENTIATE between the following types of heat exchangers:
a.
Single-pass versus multi-pass heat exchangers
b.
Regenerative versus non-regenerative heat exchangers
Introduction
A heat exchanger is a component that allows the transfer of heat from one fluid (liquid or gas)
to another fluid. Reasons for heat transfer include the following:
1.
To heat a cooler fluid by means of a hotter fluid
2.
To reduce the temperature of a hot fluid by means of a cooler fluid
3.
To boil a liquid by means of a hotter fluid
4.
To condense a gaseous fluid by means of a cooler fluid
5.
To boil a liquid while condensing a hotter gaseous fluid
Regardless of the function the heat exchanger fulfills, in order to transfer heat the fluids involved
must be at different temperatures and they must come into thermal contact. Heat can flow only
from the hotter to the cooler fluid.
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