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What are the main types of heat exchanger in the cold dryer

There are many industrial heat exchangers used in the inter wall heat exchanger, almost all of which are used in the compressed air cooling and drying mechanism cooling technology.

The hot and cold fluid can flow in parallel or cross flow in the wall heat exchanger. In parallel flow, if the flow direction of cold and hot fluid is the same, it is called forward flow heat exchanger; if the flow direction of cold and hot fluid is opposite, it is called counter flow heat exchanger; if the flow direction of cold and hot fluid is perpendicular to each other, it is called cross flow or bifurcated heat exchanger. There are also a variety of mixed flows.

What is a rib tube? How many forms are there?

In order to increase the heat exchange area, the tubes with sheet metal on the surface can be called finned tubes. The sheet on the surface of a metal tube is called a rib, fin, or fin. Among them, the one that is sleeved on the pipe in the form of punching or drilling is called "sleeve piece", and the narrow strip that is spirally wound on the pipe is called spiral rib; the one whose plane is parallel to the center line of the pipe is called longitudinal rib; the one that is expanded or installed on the inner wall of the pipe is called inner rib. The distance between two adjacent ribs on the tube is called rib distance; the number of ribs per unit tube length is called rib number, and the distance between two segments on the rib tube (excluding the elbow and non rib segment of the tube) is called rib tube length.

What is the name of the cold dryer rib wall coil heat exchanger?

A kind of time wall heat exchanger, which is widely used in the aftertreatment and purification equipment of compressed air, such as rear cooler, air-cooled condenser and other components.

The heat exchanger is composed of several groups of serpentine tube bundles. In order to enhance the heat transfer effect, fins are added to the outer wall of the heat exchanger on the side with smaller convective heat transfer coefficient, which greatly enhances the heat transfer. Compared with the smooth tube, the heat transfer coefficient can be increased by 1-2 times. This kind of heat exchanger is often used for heat exchange between the fluid in the tube and the air outside the tube. Because of its compact structure, it is very suitable for the heat exchange situation where the heat transfer coefficient of the fluid on both sides of the heat exchange surface is quite different.

The performance of the finned tube heat exchanger mainly depends on the shape and structure of the fin and the way of connecting with the tube. The shape of the rib can be divided into disc groove or hole type, wrinkle type and wire type. The main disadvantage of finned tube heat exchanger is that the resistance of fins is large. Different structures and different connection modes have great influence on air flow resistance, especially on heat transfer performance. When the fins are not in good contact with the base tube, the effect of fins will be greatly reduced.

What is the shell and tube heat exchanger of the cold dryer?

Shell and tube heat exchanger is a main form of time wall heat exchanger. Most of the precoolers, evaporators and water-cooled condensers in the compressed air dryer use this type of heat exchanger. The heat transfer surface of the utility model is composed of a tube bundle, two ends of the tube are fixed on the tube sheet, the tube bundle and the tube sheet are sealed in the shell, and both ends of the shell are provided with heads.

In order to enhance the heat transfer effect, different measures can be taken, such as adding ribs or using zigzag copper tubes. A kind of fluid flows into the pipe from the inlet end of the head, and then flows out through the head, which is called the pipe pass. Another kind of fluid enters the heat exchanger from the connecting pipe of the shell and flows between the shell and the tube bundle. This path is called the shell side. The cold and hot fluids in the tube side and shell side are not mixed with each other, but exchange heat through the tube wall. At the same flow rate, the heat exchange effect of fluid flowing across the tube is better than that flowing along the tube surface longitudinally. Therefore, several baffles are generally set in the shell to improve the heat exchange in the shell side.

The typical shell and tube heat exchanger is used in the precooler. The refrigerant is generally in the tube side of the evaporator, and the compressed air is in the shell side.

What is the plate fin heat exchanger of the cold dryer?

The plate fin heat exchanger belongs to a wall to wall heat exchanger. It is a compact and efficient heat exchanger with all aluminum structure. Each channel of the utility model is composed of a baffle plate, a fin, a guide vane, a seal strip, etc.

Plate fin heat exchanger has fins on both sides. As a gas gas heat exchanger, the heat transfer coefficient has been greatly improved, which is about 10 times of that of shell and tube heat exchanger. The plate fin heat exchanger has a compact structure. In the heat exchange volume per cubic meter, it can hold a heat exchange area of 2500m2, and the pressure can reach 10MPa. Its disadvantages are easy to block, difficult to clean and difficult to overhaul. It is suitable for clean and low corrosive fluid heat transfer.

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