Facility heat exchanger
Heat exchanger is a device that is used to transfer heat optimally from one environment to another. Heat exchangers transfer heat between two or more fluid streams that flow inside the device.
What are heat exchangers?
Types of heat exchangers in central heating and air conditioning installations
- Shell & tube heat exchangers
- Plate heat Exchanger
- Fin Heat Exchanger
Tubular heat exchanger
Each of the above heat exchangers is divided into the following types:
- Heat exchanger with synchronous flow
- Converter with inconsistent current
- Cross heat exchanger
Shell and tube heat exchanger
Shell & tube heat exchanger
These converters are widely used in the chemical industry, such as crude oil distillation units, as the name implies. The shell-tube heat exchanger consists of a large cylindrical tank (shell) at high pressure and a number of tubes inside.
The liquid moves inside the pipes and hot steam flows on the pipes and inside the shell. Due to the large number of these pipes and the high contact surface it creates, the heat of the steam is transferred to the liquid inside the pipe and brings the liquid to a boil. The most common type of heat exchangers are shell-tube heat exchangers, which have different types depending on the number of shell and tube passes. The simplest of them has a shell pass and a tube pass, which are shown in the figure above. it has been shown.
Pool heat exchanger
In these converters, walls are usually installed to increase the coefficient of fluid displacement in the shell by creating turbulence and creating a component of transverse velocity in the flow, which are called baffles.
Baffle heat exchangers are usually produced with one shell pass and two pipe passes or with two shell passes and four pipe passes.
In shell and tube heat exchangers with baffles (flow guiding plates), the fluid flow to the shell side is directed crosswise with the pipes between two adjacent baffles.
Two-pipe heat exchanger
Heat exchangers, shell and tube U-shaped most cost structure, because only one tube is required, the inner surface of the pipe to bend U-shaped pit, unable to mechanical cleaning, the exchanger is an even number It is used for pipe passages, but there is no limit in terms of thermal expansion. The material of the pipes is responsible for the exchange in the shell and pipe exchanger, so that they are heat transferred from both sides in contact with the fluids.
Second hand heat exchanger
In fact, the pipes play a separating role in the shell and pipe converter. The size of these pipes is different. The pipes are usually made of copper, but depending on the application, they can be made of stainless steel (steel), nickel, aluminum, Brass and titanium, but due to the heat transfer coefficient of the fluid inside or outside the pipe in any direction that this coefficient is lower, can be used with pipes with inside or with wings, which is the cost of construction of this device. Is higher.
Heat exchanger in the refinery
Shell and tube heat exchanger handle, which together with tube sheets is responsible for holding the pipes, connecting inlets and outlets, and so on.
Heat transfer also takes place inside the shell. The thickness of the shell depends on the working pressure and the diameter of the shell.
Steel or stainless steel is commonly used to make shell and tube heat exchangers.
Because its heat transfer must be at the lowest level and its pressure can be tolerated at the highest possible level, on the shell of the heat exchanger, the shell and the pipe must have water inlet and outlet path, hook, hanger, drain connection, sensor safety valve installation location, and so on. Be.
Shell and tube heat exchangers have different arrangements in terms of fluid flow on the shell and tube side and are selected and used based on heat transfer level, working pressure, coil pressure drop, manufacturing methods and cost of corrosion control and cleaning issues. Placed.
Baffles are used in shell and tube converters to increase the heat transfer coefficient on the shell side as well as to better hold the tubes in place.
The advantages of shell and tube converters can be named as follows:
- In small volumes, they create a large surface for heat transfer.
- Can be used for a wide range of materials.
- Easy to clean.
How does a heat exchanger work?
Plate heat exchanger and its types
The plate heat exchanger, which has been used in the industry for more than one hundred years, mainly consists of two models in terms of structure: gasket and bruzzed.
Washer plate heat exchangers are mainly used in industries such as food industry, petrochemical industry, paint line of automotive industry, oil industry, etc., which due to the cost of frames compared to welding heat exchangers, even in the same size and capacity have Prices are higher.
Of course, the advantage of gasket plate heat exchangers over welding is the ability to increase capacity, repair and service and easy washing.
Plate heat exchanger
Plate heat exchangers have a very high overall heat transfer coefficient, much smaller dimensions and higher efficiency than conventional shell and tube heat exchangers (such as coil and double-walled sources), especially if they are installed in the cold water inlet path. Instantly supply the required hot water to the consumer in a completely “hygienic” way without the need for storage (such as coil and double wall sources).
Welding heat exchanger mainly for supplying hot water used in buildings, pool water heating, underfloor heating systems, oil cooling, as evaporator and condenser in chillers and…. They are used, which, except for the case of spa consumption, must be calculated accurately in other cases, and in this regard, you can negotiate with the experts of Domatjahiz Engineering Company.
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