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[Chemical Knowledge]：Analysis of the working principle of heat exchanger, take you to understand its dynamic map!

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A heat exchanger, as the name suggests, is a device that transfers thermal energy from one medium to another. Heat exchanger is a very important facility in industry, construction, transportation and other fields, and it is also the main means to achieve energy saving. In the heat exchanger, there are many ways of heat transfer, the most common of which are conduction, convection and radiation.

in the heat exchanger, the commonly used media are liquid, gas and slurry. According to the medium that needs to transfer heat energy, the heat exchanger can be divided into different types, such as: industrial steam heat exchanger, water pump heat exchanger for air conditioning, heating radiator, etc.

So, how does the heat exchanger work? We learn about it through dynamic diagrams.

Figure 1: The working principle of the heat exchanger Dynamic diagram

From the above figure, we can see that in the heat exchanger, two media: hot medium and cold medium, flow through the pipeline, on the contact surface for heat exchange. When the heat medium passes through the pipe, the wall inside the pipe will transfer heat energy to the cold medium, so that the cold medium enters from the entrance and becomes the heat medium to continue through the pipe.

in the heat exchange process, the temperature of the heat medium is continuously reduced (the corresponding heat energy is transferred to the cold medium), while the temperature of the cold medium is continuously increased (the corresponding heat energy is absorbed). At this point, the temperature difference between the two media is getting smaller and smaller until the two temperatures are equal and the heat exchange process ends. The main function of the

heat exchanger is to transfer the heat energy of one medium to another medium, so as to achieve the purpose of heating or cooling. For example, when we take the subway in summer, we will feel the air near the vent is cool. At this time, the water pump heat exchanger for air conditioning is working. Through the heat exchanger, the atmosphere (cold medium) in the subway car and the water (hot medium) in the underground ventilation pipe transfer heat to each other, so that the air in the car is cooled and does not feel stuffy. Another example of

is a solar water heater. It uses a solar absorber to convert the thermal energy of solar radiation into a thermal medium, which is transferred through a pipe and meets tap water (cold medium) through a heat exchanger, so that hot water can be supplied.

In addition, in the industrial field, the heat exchanger is also a very important equipment. For example, in the mining process of steel, copper, etc., high-intensity heating and cooling are required. At this time, industrial steam heat exchangers or other special types of heat exchangers can be used for thermal energy transmission. At the same time, the heat exchanger can also be used in nuclear power plants, coal and other fields, play a role in energy saving.

have heat exchangers, we can use heat energy more efficiently for heating or cooling purposes. With the continuous progress of science and technology, the use of heat exchanger has become more and more widely. It is believed that with the further development of technology, the heat exchanger will have a broader application prospect.

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