Plate heat exchanger
Plate heat exchangers are now common and very small brazed versions are used in the hot-water sections of millions of combination boilers.
The high heat transfer efficiency for such a small physical size has increased the domestic hot water (DHW) flowrate of combination boilers.
Stainless steel is a commonly used metal for the plates because of its ability to withstand high temperatures, its strength, and its corrosion resistance.
The plates are pressed to form troughs at right angles to the direction of flow of the liquid which runs through the channels in the heat exchanger.
The plates are compressed together in a rigid frame to form an arrangement of parallel flow channels with alternating hot and cold fluids.
Making each chamber thin ensures that the majority of the volume of the liquid contacts the plate, again aiding exchange.
The troughs also create and maintain a turbulent flow in the liquid to maximize heat transfer in the exchanger.
Hence, when evaluating a plate heat exchanger, it is very important not only to explore the details of the product being supplied but also to analyze the level of research and development carried out by the manufacturer and the post-commissioning service and spare parts availability.
In general, greater heat transfer enhancement is produced from chevrons for a given increase in pressure drop and are more commonly used than intermating corrugations.
[2] There are so many different ways of modifications to increase heat exchangers efficiency that it is extremely doubtful that any of them will be supported by a commercial simulator.
This approach requires both sides of the PHE (Plate Heat Exchanger) to be drained, followed by its isolation from the fluid in the system.
The shape of plate heat exchanger is very important for industrial applications that are affected by pressure drop.
[4][5] In recent years Wang [6][7] unified all the main existing models and developed a most completed theory and design tool.
[2] Their cleaning helps to avoid fouling and scaling without the heat exchanger needing to be shut down or operations disrupted.
In order to avoid heat exchanger performance to decrease and service life of the tube extension, the OnC (Online Cleaning) can be used as a standalone approach or in conjunction with chemical treatment.
According to analysis estimated, effect of fouling formation will generate a huge cost of operational losses which more than 4 billion dollars.
