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Specializing in the research, development, production, sales, equipment consulting, maintenance, and accessory services of heat exchange technology, equipment, and systems
15
2023
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Introduction to the working principle and structure of shell-and-tube heat exchangers in chillers
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Summary:
Many people are very familiar with heat exchangers, and there are various types of heat exchangers. The shell-and-tube heat exchanger is a relatively common type of heat exchanger. Many people want to know how shell-and-tube heat exchangers work. Today, I will briefly introduce the working principle and structure of shell-and-tube heat exchangers.
Introduction to the working principle and structure of shell-and-tube heat exchangers in chillers
Many people are very familiar with heat exchangers, and there are various types of heat exchangers. The shell-and-tube heat exchanger is a common type, and many people want to know how it works. Today, I will briefly introduce the working principle and structure of the shell-and-tube heat exchanger.
Working principle of shell-and-tube heat exchangers - What is a shell-and-tube heat exchanger
The shell-and-tube heat exchanger, also known as a tube bundle heat exchanger, uses the wall surface of the tube bundle enclosed in the shell as the heat transfer surface. This type of heat exchanger has a simple structure, reliable operation, and can be made from various structural materials (mainly metals). It can be used under high temperature and high pressure, making it the most widely used type currently. The materials for shell-and-tube heat exchangers are generally carbon steel, stainless steel, and copper. When the tube plate made of carbon steel is used as a cooler, corrosion leaks often occur at the welds between the tube plate and the tubes, leading to contamination of the cooling water system and material waste. Due to the different temperatures of the fluids inside and outside the tubes, the temperatures of the shell and the tube bundle also differ.
Working principle of shell-and-tube heat exchangers - How does a shell-and-tube heat exchanger work
The shell-and-tube heat exchanger is composed of multiple layers of materials with good thermal conductivity, and its working principle is similar to that of a water heater. A water heater generates heat from gas combustion, while the heat transfer medium in a heat exchanger does not involve an open flame. Inside the heat exchanger, there are two pipeline circuits: one is the heat source and the other is the heated source. The heat source is like the flame during the combustion of a water heater, such as hot water or steam. The heated source is like the water being heated in the water heater. Additionally, there is a regulating valve before the heat source inlet in the heat source circuit of the heat exchanger, which can adjust the temperature of the heated source by changing the opening of this valve.
Working principle of shell-and-tube heat exchangers
Working principle of shell-and-tube heat exchangers - Structure of shell-and-tube heat exchangers
The shell-and-tube heat exchanger consists of components such as the shell, heat transfer tube bundle, tube plate, baffle plates, and tube box. The shell is mostly cylindrical, with a tube bundle installed inside, and the ends of the tube bundle are fixed to the tube plates. The two fluids involved in heat exchange are the hot and cold fluids, with one flowing inside the tubes (called the tube side fluid) and the other flowing outside the tubes (called the shell side fluid). To improve the heat transfer coefficient of the fluid outside the tubes, several baffle plates are usually installed inside the shell. The baffle plates can increase the velocity of the shell side fluid, forcing it to pass transversely through the tube bundle multiple times, enhancing the turbulence of the fluid. The heat transfer tubes can be arranged in an equilateral triangle or square pattern on the tube plate. The equilateral triangle arrangement is more compact, resulting in higher turbulence of the shell side fluid and a larger heat transfer coefficient; the square arrangement, however, facilitates cleaning of the outside of the tubes and is suitable for fluids that are prone to scaling.
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Chongqing Southwest Saiwei Heat Exchange Equipment Co., Ltd. is committed to providing customers with excellent heat exchange equipment solutions. With the rapid development of the industrial field, the demand and application of heat exchange equipment are becoming more and more extensive. The company deeply knows that each customer's needs are unique, so customized solutions have become our core competitiveness.
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Chongqing Southwest Saiwell Heat Exchange Equipment Co., Ltd.
Specializing in the research, development, production and sales, equipment consulting, maintenance, and accessory services of heat exchange technology, equipment, and systems, and undertaking the design and installation of thermal system engineering, energy conservation and emission reduction, and energy conservation and emission reduction system engineering.
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