All of the compact heat exchangers in the library can be grouped into one of two categories: finned circular tube and plate-fin. In the plate-fin heat exchanger, b indicates the width of the passages through which the fluid travels. Pressure drop for plate-fin heat exchangers does not include end effects due to compression and expansion of fluid. According to the heat transfer process -- the heat exchanger may use an indirect contact or direct contact heat transfer method. In indirect contact heat transfer, the fluids in the system are separated by a thermally conductive boundary layer which allows heat energy to flow but prevents mixing or contamination. In counter flow heat exchangers, fluids flow from opposite directions towards each other. According to construction - the heat exchanger may incorporate shell & tube, plated, or air-cooled construction.
For the purposes of sourcing a heat exchanger, the most important classification method is construction. Shell & tube heat exchangers are the most versatile type, and account for nearly 60% of all heat exchangers used. Corrugated or enhanced surface tubes contain small ridges which increase surface area for improved heat transfer. Hairpin heat exchangers are U-tube heat exchangers with separate cells for both inner tube bundles, increasing heat transfer efficiency. Floating or floating-head heat exchangers have one tube sheet connected to the shell and another that is free floating. Fixed heat exchangers have all tube sheets or bundles attached and fixed to the shell.
Plated or plate-type heat exchangers use metal plates instead of tubes as the thermally conductive boundary between fluids. Brazed plate heat exchangers consist of specially formed plates, vacuum brazed together to form a heat transfer device.
Gasketed plate heat exchanged use high quality gaskets to seal and clamp together plates and protect against leaks. Plate coil or panel coil heat exchangers are a hybrid of tube heat exchangers and plate heat exchangers. Air cooled heat exchangers (ACHEs), also called "fin-fans", are designed to use air to directly reject heat from an immiscible fluid stream. Forced draft heat exchangers "force" or push air through the unit by installing fans at the inlet below the tube bundle.

Induced draft heat exchangers pull air through the unit by installing fans at the outlet above the tube bundle. A typical heat exchanger selection form or selection request requires the user to submit a number of different specifications to the manufacturer in order to design the product. Oversurfacing is a factor of safety approach often used in heat exchanger design as a means of arbitrarily increasing the heat-transfer surface area to allow for fouling. Copper has the best heat transfer performance of all metals commonly used in heat exchangers, due to its high thermal conductivity. Brass, an alloy of copper and zinc, is stronger than copper while still retaining high thermal conductivity for efficient heat transfer. Finally, it is essential that heat exchanger can be properly connected to the system it is being integrated into. For more information on connection types, visit Pipe Fittings or Tube Fittings on GlobalSpec. Heat Exchangers Types, Theory and BasicsThis CBT, with skills tests, makes a great animated study guide for related heat exchanger types. Ekin Industrial is an expert company which has wide product range which includes plate heat exchangers.. Plate heat exchangers are such devices that work with the principle of two different liquids making heat transfer in themselves. Cooling units, the evaporator, condenser, heating applications, the rapid heating and the specific applications.
MIT water heater innovative structure, insulation and environmentally sensitive design responds to the needs of users. Provided by central heating systems with the advantage of economy determine independently of the individual systems combines comfort conditions. Ekin Industrial has entered Turkey's sector of imported heat plate exchange, with its customer focused vision and dynamic, Ekin has expanded into new and upcoming investments. There are three main types of heat exchangers based on design: shell & tube, plated, and air-cooled. The target fluid (fluid being heated or cooled) runs inside these tubes while the secondary (heat transfer) fluid flows over them inside the shell. They are able to handle heavy fouling fluids or applications where temperature cross conditions exist (when the fluid being heated has an outlet temperature that falls between the inlet and outlet temperature of the heating medium).
This eliminates thermal stress between the tube bundle and shell, often at the cost of heat transfer efficiency and simplicity. These heat exchangers are typically constructed of a singe material (most commonly stainless steel).

When sourcing a standard heat exchanger, these same specifications should be understood in order to properly select the right design for the application. Heat transfer efficiency increases with increasing flow rate in a heat exchanger, but flow is limited by the size of the pump available and the maximum allowable pressure drop in the system (which also increases with flow rate).
Often manufacturers will request both inlet and outlet temperatures for each side of the heat exchanger. Compared to other heat exchanger metals, stainless steel has a lower heat transfer efficiency and is often more expensive. Within these basic types, individual heat exchangers vary greatly in design and complexity to fit the needs of specific applications and systems. They are less ideal for high velocity or boiling liquid applications where convective heat transfer plays a large role, and can actually impede heat transfer in these situations.
These heat exchangers are typically composed of stainless steel plate with copper brazing, making them extremely corrosion resistant.
These heat exchangers are very versatile, and can be used with high-viscosity fluids and fluids with high and heavy suspended solids content without clogging or requiring frequent cleaning. Brass alloys with higher amounts of zinc are more resilient, but at the cost of heat transfer performance. It is best suited for working with corrosive and aggressive heat transfer fluids such as deionized water. These heat exchangers are simple and cheap to maintain, since the plates can be easily removed. However, since the plates are welded together they cannot be cleaned mechanically like gasketed heat exchanger plates. Recently, new improvements in gasket design and heat exchanger design have allowed plate type heat exchangers to be used more regularly in large scale applications. Semi-welded heat exchangers are often used for handling expensive materials since fluid loss is very unlikely. The Heat Exchanger training program provides detailed explanations of Heat Exchanger assembly and dismantling. Those with previous training may find this program a good refresher and may learn some important information not covered in their original training.

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