A heat exchanger is a device that is designed so to
efficiently transfer or "exchange" heat from one matter to the
another. In this process, when a fluid
is used to transfer heat, it can be water or oil or air. Thus, the most
well-known type of heat exchanger is a car radiator.
The exchangers are one of the most important and
widely used as a process equipment in various industrial sites. Regardless of
the particular industry in mention, it will likely require some type of
temperature regulation, and for that exchangers are likely to come into play in
the future. The exchangers may be used for either heating or cooling, however,
in the industrial sector, they are overpoweringly used for cooling particularly
within plants and refineries.
Let us dive a little deeper into what heat exchanger
are, their need, working and functioning, and how they are classified.
Why Are Heat Exchangers Needed?
Heat exchangers are broadly used and have various
range in industrial applications. They are used as components of air
conditioning and cooling systems or of heating systems. A lot of industrial
processes call for the heat exchanger for the function of heat, however, mainly
an essential care must be taken to keep these processes from getting too hot.
The heat exchangers in the industrial plants and
factories are required to keep machinery, chemicals, water, gas and other
things in a safe zone while operating a particular temperature. Apart from
this, the heat exchangers may also be used to capture and transfer steam or
heat exhaust that is released as a byproduct from a process or operation such
that the steam or heat can be put for a better use elsewhere. Thus, this
increasing efficiency and saving the plant money is what heat exchangers server
for. And, due to this, the heat exchangers are essential in industries across
the world.
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Process of Heat Exchange
The heat exchanger classification method mainly
refers either to the heat, that is being exchanged on a direct note, or whether
they are separated by a physical barrier, such as the walls of their tubes.
Direct Contact Heat Exchangers – When talking about
direct contact heat exchangers, these tend to bring the hot and cold fluids
into the direct contact with each other in the tubes itself. This process is
extremely effective means of transferring heating in a direct way, as it is
considered to be safe and is desired to be processed in almost every industry,
across the world. Further, direct contact heat exchangers may be a good choice
if the hot and cold fluid are merely different temperature variations of the
same fluid, or if the fluid mixture is a desired or irrelevant part of the
industrial process.
Indirect Contact Heat Exchangers – In the indirect
contact heat exchangers process, the hot and cold fluids are kept physically
separated from each other. Typically, indirect contact heat exchangers keep the
hot and cold fluids in different sets of pipes and rely on radiant energy and
convection to exchange the heat. This is frequently done to avoid contamination
or pollution of one fluid by the other.
