How efficient is a shell and tube heat exchanger?
In case of the industrial heat exchanger presented in the paper, the change of flow directions in shell and tube side has been carried out in the meantime. This change actually solved the problem, and resulted in the designed performance with efficiencies around 95%.
Which type of heat exchanger gives highest efficiency?
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 the efficiency of a heat exchanger?
The heat exchanger efficiency is defined as the ratio of the heat transferred in the actual heat exchanger to the heat that would be transferred in the ideal heat exchanger. The concept of heat exchanger efficiency provides a new way for the design and analysis of heat exchangers and heat exchanger networks.
Which heat exchanger design is the most efficient shell and tube or plate?
Plate heat exchangers are up to five times more efficient than shell-and-tube designs with approach temperatures as close as 1°F. Heat recovery can be increased substantially by simply exchanging existing shell-and-tubes for compact heat exchangers.
Why counter flow heat exchangers are 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 is shell and tube heat exchanger preferred?
Advantages of Shell and Tube Heat Exchangers; Smaller designs can be lower cost. Much easier to service. O Ring seals also make them cheap to service. A better solution for sea water coolant, or other fluids at risk of clogging in narrow spaces.
How to operate a shell and tube heat exchanger?
•Operate shell and tube heat exchanger varying steam flow •Determine the outside overall heat transfer coefficient (U o) •Determine shellside heat transfer (Q SS) •Determine tubeside heat transfer (Q TS) Condense the objective into the primary objective(s).
What kind of heat exchanger is used in steam?
The shell and tube heat exchanger (STHE) is the workhorse in the steam world, and it is used in many process steam applications. The design is very flexible to meet the strenuous requirements found in steam and condensate systems.
How big does a steam trap need to be for a heat exchanger?
A minimum 1/2 inch pitch per 10 foot length should be provided. The heat exchanger should also be located such that removal of the tube bundle is possible. Steam Traps. The steam trap must be capable of com- pletely draining the condensate from the heat exchanger shell under all operating conditions.
What makes a plate heat exchanger more efficient?
This pattern also creates turbulent flow in the channels, improving heat transfer efficiency, which tends to make the plate heat exchanger more compact than a traditional shell and tube heat exchanger. The promotion of turbulent flow also eliminates the presence of stagnant areas and thus reduces fouling.
