A heat exchanger is a device built to either eat or cool off elements by transferring heat from one medium to another, ideally liquid or gas. Heat exchangers are used across a variety of industries in numerous ways. In this PPT, know about the types of heat exchangers according to their transfer process.

1. TYPES OF HEAT EXCHANGERS
ACCORDING TO TRANSFER PROCESS

2. Classification of heat exchangers according to
transfer process
• A heat exchanger is a device built
to either eat or cool off elements
by transferring heat from one
medium to another, ideally liquid
or gas.
• Heat exchangers are classified
into direct contact type heat
exchangers and indirect contact
type heat exchangers in terms of
their transfer process.

3. Direct Contact Type Heat Exchangers
• In these exchangers, two fluids come
in a direct contact to exchange heat
and then separate away.
• They are cost-effective, facilitate high
heat transfer and easy installation.
• These devices have no separating
wall, and avoid any foul behaviour.
• They are benign when the hot and
cold fluids of the same fluid medium
are at varying temperatures.
• Direct contact type heat exchangers
are further classified into:

4. 1. Immiscible fluid exchangers: The
energy is transferred through
straight contact of two immiscible
fluids i.e. two non-mixing liquids
together.
2. Gas - Liquid exchangers: These
machines have one fluid media
that is a gas while the other fluid
being liquid, usually water.
3. Liquid Vapour exchangers: Heat
transfer in them takes place by
condensing a steam, entirely or
partly by using water or by
heating water through steam; both
are carried out by direct contact.

5. Indirect Contact Type Heat Exchangers
• These heat exchangers are also
known as surface heat exchangers.
• Two fluids, hot and cold, are kept
physically separated from each
other, with a metal wall, to avoid
contamination of both.
• The heat, however, is transferred in
an ephemeral way.
• They are divided into the following
types:

6. 1. Direct transfer type heat exchanger:
Unceasing warmth is transported from
hot to the cold fluid through a
partition, with the two fluids flowing
through separate channels.
2. Storage type heat exchanger: Two
fluids flow alternatively in the same
passage due to which the heat transfer
is irregular.
3. Fluidized bed heat exchanger: They are
two-fluid exchangers with a side
immersed in a bed of finely distributed
solid material.

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