Heat Exchanger

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Heat Exchanger

Heat exchangers are devices for transferring heat energy between two or more fluids at different temperatures. Heat exchangers have a wide range of applications in power generation, chemical and food industries, electronics, environmental engineering, heat recovery, manufacturing, ventilation, refrigerators, space industries, and more.

heat exchanger

Heat exchangers can be categorized in terms of various parameters, some of them are as follows:

1- Direct heat transfer between fluids (Recuperator) / Indirect heat transfer between fluids (Regenerator)

This means how the heat transfer mechanism is used by the two operating fluids to directly heat transfer or by intermediate storage and then heat transfer mechanism.


2- Direct contact heat transfer / Indirect contact (Transmural) heat transfer


3. Geometric Properties

Tubes, Plates, and Enhanced Surfaces (Fins)


4- Heat transfer mechanism

Single Phase / Two-Phase (Evaporation & Condensation)


5. Fluid direction

Parallel flow, Counter flow, Cross flow





The main parameters for selecting a heat exchanger from its different types can be stated in the following parameters:

• The heat exchanger must satisfy the characteristics of the overall process of the system.

• The heat exchanger must be of good durability depending on the environmental conditions of the site.

• The heat exchanger must be repairable according to working conditions. This configuration should be selected to prevent continuous cleaning or replacement of components sensitive to physical and chemical corrosion or vibration.

• Heat exchangers should be economical. The costs of installing and repairing a heat exchanger include losses in production due to the time taken to repair and the unavailability of heat exchanger should be calculated and minimized.

• There are always limitations to an industrial site regarding the diameter, length, width, weight, and configuration of pipes and fluid conduits.

Chevron Plate Heat Exchangers

Heat exchangers are equipment used to transfer heat between cooling and hot fluid. The fluid composition used in the heat exchangers is liquid-liquid, gas-liquid and liquid-gas. Heat exchangers have many industrial applications such as power plants, refineries, process industries, space industries, and so on. In general, heat exchangers are divided into two groups, including Shell and Tube type and Plate type heat exchangers. The plate heat exchanger structure consists of a series of parallel thin plates. Chevron plate heat exchanger is a plate heat exchanger type. Each of the chevron plates has a series of angular grooves in two different directions and four holes for different inlets and outlets. Each of cold and hot flows passes through the middle of the plates and these hot and cold flows do not mix.

chevronMr CFD

Liquid-Air Heat Exchanger

The main task of heat exchangers is to transfer heat from a warmer flow to a colder flow to increase or decrease the temperature in a given flow. Sometimes they use a liquid and airflow cycle as heat exchangers in buildings to conserve energy and make optimal use of available energy. Run-Around Heat Exchangers (RAHEs) are those designed to conserve energy during the heat transfer process. The structure of this type of heat exchangers consists of a closed cycle containing a type of salt solution that is in a constant and continuous flow between two liquid-air heat exchangers. These two heat exchangers are embedded in two separate channels inside a building so that the outside air flows through one of the two channels, passing through the heated solution in the cycle, increasing the temperature and being referred to interior space of building as Supply Air-Flow; then the return air from inside the building passes through the other channel and its temperature decreases passing the cooling solution in the cycle, and known as exhaust airflow through the system.

heat exchanger


Spiral Heat Exchanger

The spiral heat exchanger consists of two flat plates that are coiled together, forming two fluid passage channels parallel to each other. One fluid flow enters the coil center and exits laterally, while the other fluid flow enters laterally and exits the center, such that two hot and cold fluids transfer heat. The coils transfer heat with each other. An important feature of this type of converter is the high heat transfer between two fluids in a compact and optimized space, as the coil and spiral structure of these heat exchangers create more contact area in a given space. Also, this type of converter has less pressure drop in the fluid than other compact heat exchangers and also requires less energy to pump the fluid. One of the features of these types of converters is their anti-sedimentation properties so that the fluid in these converters has a very low-pressure drop. If in some parts of the converter, particles, and solids sediment on the inner surface of the structure, it causes the cross-section to be decreased and increases the fluid velocity. So, the sediment separates from the surface of the inner walls by flow high-velocity motion.

spiral heat exchanger


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