Plate exchanger
is the most efficient due to turbulent flow on both sides. High heat-transfer coefficient and high turbulence due to even flow distribution are important. However, a plate heat exchanger regenerator is restricted to low viscosities.
What is an advantage to counter current heat exchange?
Counter flow heat exchangers are more efficient than parallel exchangers, and it is all because of
a uniform temperature difference between fluids over the whole exchanger and fluid paths
.
Why counter flow heat exchanger is more efficient?
Counter flow heat exchangers are inherently more efficient than parallel flow heat exchangers
because they create a more uniform temperature difference between the fluids, over the entire length of the fluid path
. … Each time a fluid moves through the length is known as a pass.
Why the counter flow is preferable than the parallel flow in condensers?
Counter flow heat exchangers are the most efficient of the three types. In contrast to the parallel flow heat exchanger, the counter flow heat exchanger
can have the hottest cold- fluid temperature greater than the coldest hot-fluid temperatue
.
What are the advantages of counter flow arrangement over parallel flow arrangement?
The counter-flow heat exchanger has three significant advantages over the parallel flow design. First,
the more uniform temperature difference between the two fluids minimizes the thermal stresses throughout the exchanger
.
What are the 3 types of heat exchangers?
- Finned Tube Heat Exchanger Or Air Cooled Heat Exchanger. Suitable for: air/gas to fluid. …
- Shell And Tube Heat Exchanger. Suitable for: fluid to fluid / fluid to gas. …
- Plate Heat Exchanger Or Gasket Plate Heat Exchanger. Suitable for: fluid to fluid / fluid to vapour.
What are the disadvantages of plate heat exchangers?
- Initial cost is high since Titanium plates are expensive.
- Finding leakage is difficult since pressure test is not as ease as tube coolers.
- Bonding material between plates limits operating temperature of the cooler.
- Pressure drop caused by plate cooler is higher than tube cooler.
What is the advantage of counter-current flow?
Countercurrent flow
produces the maximum concentration difference over the entire length of the membrane and allows recovery of a substantial portion of the most highly diffusive solute
while minimizing the transport of the less diffusive solutes.
Is Co-current or counter-current better?
The maximum amount of heat or mass transfer that can be obtained is higher with
countercurrent
than co-current (parallel) exchange because countercurrent maintains a slowly declining difference or gradient (usually temperature or concentration difference).
What is the advantage of counter-current flow over co-current flow in a heat exchanger?
One of the great advantages of counter-current flow is
the possibility of extracting a higher proportion of the heat content of the heating fluid
. It is important to note that the LMTD value for counter-current flow is much larger than for cocurrent flow at the same terminal temperature (see Figure 1.9).
Why do we use lmtd in heat exchanger?
The log mean temperature difference (LMTD) is used
to determine the temperature driving force for heat transfer in flow systems
, most notably in heat exchangers. The LMTD is a logarithmic average of the temperature difference between the hot and cold streams at each end of the exchanger.
What is counter flowing flowing?
With a counter flow arrangement,
the cooling medium flows in the opposite direction to the liquid being cooled
. Find out why this so much more efficient. In a shell and tube heat exchanger, coolant usually flows through the central ‘tube core' to cool hot oil, water or air, which passes over and around the tubes.
Why is graphite heat exchanger the most efficient?
Advantages of Graphite Cubic Blocks
Graphite is
a more thermally efficient material of construction
, typically using 1/2 to 1/3 the heat transfer area required by a glass unit. Graphite is more robust and can be subjected to greater pressure. In sulfuric acid dilution.
Is it better to arrange for the flow in a heat exchanger to be parallel or counter flow?
Counter flow heat exchangers are inherently more efficient than parallel flow heat exchangers
because they create a more uniform temperature difference between the fluids, over the entire length of the fluid path. … For example, one fluid may make 2 passes, the other 4 passes.
What are the factors that can affect the efficiency of a heat exchanger?
The main factors affecting the performance heat exchanger tubes include:
fluid velocity, tube diameter, converter tube shape (U or cross shape)
, converter layout order (horizontal or vertical), and Venting valve, material of tube sheet and channel and location order of input channel.
Which type of flow arrangement gives maximum heat transfer?
The counter flow pattern
is the most common in shell and tube heat exchangers, primarily because it's the most efficient. This flow pattern allows for the greatest temperature change between fluids.
