This document discusses different types of condensation and heat exchangers. It describes two types of condensation - film condensation where condensate forms a liquid film on a surface, and dropwise condensation where condensate forms droplets. It also discusses log mean temperature difference, a metric used to calculate heat transfer in a heat exchanger where the temperature difference varies along its length. Counter flow arrangements are noted to be more effective for heat exchange. Industrial temperature control of heat exchangers is also briefly covered.
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Condensation & exchanger industrail temp control
1. Condensation Heat Transfer
Condensation occurs when temperature
of a vapor is reduced below its saturation
temperature.
Vapor is contacted by a solid surface at a
temp well below vapor saturation temp
Condensation Types
A) Film Condensation
B) Drop-wise Condensation
2. Film Condensation
Condensate wet the surface and form a
liquid film on the surface which fall due to
gravity
Thickness of film increases as it moves
down due to more condensation
4. Drop-wise Condensation
Condensed vapors form droplets on
surface instead of film, surface is covered
by drops
Droplets slide down the surface, when
they reach a certain size
6. Heat Exchanger
LMTD Definition
Log mean temp difference is defined as
that temperature difference which, if
constant, would give the same rate of heat
transfer as actually occurs under variable
conditions of temperature difference
7. Why Log Mean Temp Difference is
used
Derivation of this equation is based on
constant ∆T, But temperature difference
between hot and cold fluid varies through
out the length of exchanger (so its not
constant). ∆T is larger at inlet of heat
exchanger, but decreases as fluid moves
towards outlet. To have constant ∆T, we
use ∆Tlm (log mean temp difference)
