I. What is a heat exchanger?

Jun 18, 2026 Leave a message

Main types of heat exchangers

 

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• Shell-and-tube heat exchanger

* Consists of a shell, tube bundle, and tube sheet. Fluid flows in both the tube side and shell side for heat exchange.

* Reliable structure, high pressure resistance, suitable for high-temperature, high-pressure, and high-flow-rate conditions.

• Plate heat exchanger

* Uses multiple corrugated metal plates stacked and sealed to form flow channels for heat exchange.

* High heat transfer efficiency, small footprint, and easy to disassemble, clean, and expand the heat exchange area.

• Finned heat exchanger

* Adds fins to the heat exchange tubes to increase the heat exchange area and enhance heat transfer.

* Primarily used in air heat exchange applications, such as air conditioning, cooling systems, and heat dissipation equipment.

• Spiral plate heat exchanger

* Employs a spiral channel structure, allowing two fluids to flow counter-currently within the spiral channel for heat exchange.

* Less prone to scaling and clogging, suitable for media containing particles or high viscosity.

• Heat pipe heat exchanger

* Utilizes the phase change of the working fluid inside the heat pipe to achieve efficient heat transfer. It features high heat transfer efficiency, low temperature difference loss, and fast response speed.

Main uses of heat exchangers

 

 

• Industrial Production Processes

Used for heating, cooling, and process temperature control in industries such as chemical, petroleum, metallurgy, and power.

 
 

• Energy Recovery and Utilization

Used in waste heat recovery systems to improve energy efficiency and reduce energy costs.

 
 

• Refrigeration and Air Conditioning Systems

Used as a condenser and evaporator to facilitate heat exchange between the refrigerant and the external medium.

 
 

• Food and Pharmaceutical Industries

Used in sterilization, pasteurization, concentration, and cooling processes to ensure product quality and hygiene safety.

 

 

Working principle of heat exchanger

• Thermal Conduction

* Heat is transferred from the high-temperature side to the low-temperature side through a metal wall, achieving energy exchange.

• Convective Heat Transfer

* The fluid continuously exchanges heat with the wall surface during its flow, improving overall heat transfer efficiency.

• Indirect Heat Transfer (Separated by a Solid Wall)
* Two fluids are separated by a solid wall, allowing heat transfer to occur without mixing.

• Temperature Difference Driven Mechanism
* Heat transfer is driven by a temperature difference; the greater the temperature difference, the higher the heat transfer intensity.

• Phase Change Enhanced Heat Transfer
* Utilizing latent heat during evaporation or condensation can significantly improve heat transfer efficiency.

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The structure and composition of heat exchangers

 

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• Heat Transfer Elements

Including tube bundles, plates, or fins, these are the core components for heat exchange.

 

 

 

 

 

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• Shell and Frame Structure

Used to support internal components and form fluid channels, ensuring equipment strength and sealing.

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• Inlet/Outlet Pipes

Responsible for the entry and exit of hot and cold fluids, serving as crucial interfaces connecting the process system.

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• Sealing and Connection Components

Including gaskets, flanges, and bolts, used to prevent fluid leakage and ensure safe system operation.

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Key points for the operation and maintenance of heat exchangers

 

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• Prevent scaling and clogging

* Regularly clean heat exchange surfaces to prevent scale buildup from reducing heat transfer efficiency.

• Control operating parameters

* Properly control temperature, pressure, and flow rate to avoid overloading the equipment.

• Check sealing performance

* Regularly inspect seals and connections to prevent leaks that could compromise system safety.

• Monitor heat exchange efficiency

* Assess equipment operating status and make timely adjustments based on temperature difference and flow rate changes.

 

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