## What is a heat exchanger?\r\nAra Equipment 09195306763\r\n Let\'s start our work by answering an important and key question: What is a heat exchanger and what is its use? Heat exchangers are special systems that can be used to transfer heat between two or more fluids (liquid or gas). These exchangers are designed to affect the cooling and heating process. By using these special exchangers, you can change a fluid Heat or cool indirectly.\r\n Based on their structure, heat exchangers can be launched in different categories and models. Naturally, purchasing based on the needs and conditions of the project can multiply your earned efficiency. In addition, high-quality heat exchangers available in the market are always effective on the temperature transfer process.\r\n Let\'s consider an example in this context. An oil-fired heat exchanger transfers the heat generated in hot oil directly to water or air. This issue can lead to a decrease in the temperature of the oil and an increase in the temperature of the adjacent fluid. So using this product in different conditions is an important issue that you should take seriously.\r\n \r\n## Types of heat exchangers\r\n \r\nHeat exchangers can be classified into three groups of low pressure, medium pressure and high pressure according to the working pressure of the fluid. However, the types of heat exchangers are often examined based on their design structure, which are:\r\n\r\n### 1- Double pipe heat exchanger:\r\n\r\nThe simplest exchangers used in the industry are double tubular heat exchangers, which are also called tubular exchangers for short. On the one hand, the cheapness of these converters, both in terms of design and maintenance, has made them a good choice for small industries, and on the other hand, their low efficiency as well as occupying a lot of space in the scales large, has caused them to be used less in today\'s modern industries and converters with more efficiency such as shell and tube converters and plate converters are used. The structure of a tubular heat exchanger, in its simplest form, consists of two tubes with different diameters, the smaller tube being placed concentrically inside the other tube. As one of the fluids flows in the smaller tube and the other fluid flows in the annular space between the two tubes. In fact, it is the inner tube wall that forms the heat transfer surface and is often finned to achieve more surface area.\r\nMore information at https://www.aratajhizat.ir/\r\n\r\nDesign of tubular heat exchangers\r\nIn the design of these converters, one of the important factors is the type of flow pattern in the converter. A tubular heat exchanger can usually be designed for both Counter Flow and Parallel Flow patterns, but Cross Flow patterns do not work in such an exchanger.\r\n\r\n**parallel flow pattern in tubular heat exchanger**\r\nOne of the ps
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