The main feature behind the exergy
deficiency is the system irreversibilities, which mostly concern
with the entropy generation of the system. Two types of exergy
losses are considered in most of the convective heat transfer
processes, firstly, exergy losses for fluid friction and secondly,
losses for heat transfer across a finite temperature difference.
This two interconnected phenomena are the expressions of thermodynamic
irreversibility and a process investigation from this
point of view is known as analysis of second law. However,
there shows a direct proportionality between the wasted power
and the entropy generation rate. If engineering systems and
their elements are run in such a way that their amount of damage
of work is diminished, then the conceptual design of systems
and elements must follow with the reduction of entropy
generation to the least possible amount [11]. Entropy generation
and thermodynamic optimization using coiled tubes were investigated
by Ko and Ting, Shokouhmand and Salimpour [12–14].
Besides, Ko and Wu [15] analyzed the entropy generation
caused by turbulent forced convection in a curved rectangular
duct. Moghaddami et al. [16] concluded that, entropy generation
can be reduced by 3.6% with the addition of alumina nanoparticles
into base fluid (water) at laminar flow. The entropy generation
minimization in coiled tube heat exchanger imposed to
fluid flow and heat transfer is of substantial practical interest
related to improvement of heat transfer by using nanofluids.
The primary aim is to enhance the heat transfer coefficient of
wall fluid.
The main feature behind the exergy
deficiency is the system irreversibilities, which mostly concern
with the entropy generation of the system. Two types of exergy
losses are considered in most of the convective heat transfer
processes, firstly, exergy losses for fluid friction and secondly,
losses for heat transfer across a finite temperature difference.
This two interconnected phenomena are the expressions of thermodynamic
irreversibility and a process investigation from this
point of view is known as analysis of second law. However,
there shows a direct proportionality between the wasted power
and the entropy generation rate. If engineering systems and
their elements are run in such a way that their amount of damage
of work is diminished, then the conceptual design of systems
and elements must follow with the reduction of entropy
generation to the least possible amount [11]. Entropy generation
and thermodynamic optimization using coiled tubes were investigated
by Ko and Ting, Shokouhmand and Salimpour [12–14].
Besides, Ko and Wu [15] analyzed the entropy generation
caused by turbulent forced convection in a curved rectangular
duct. Moghaddami et al. [16] concluded that, entropy generation
can be reduced by 3.6% with the addition of alumina nanoparticles
into base fluid (water) at laminar flow. The entropy generation
minimization in coiled tube heat exchanger imposed to
fluid flow and heat transfer is of substantial practical interest
related to improvement of heat transfer by using nanofluids.
The primary aim is to enhance the heat transfer coefficient of
wall fluid.
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