What are the three types of heat exchangers?

Core definition: Heat transfer between hot and cold fluids is achieved through the wall of a metal pipe. It is the most widely used, traditional, and reliable type, with a robust structure that is adaptable to a variety of complex working conditions.

Key features: Excellent temperature and pressure resistance, wide range of materials, moderate cost, and adaptability to high temperature, high pressure and complex media conditions; Disadvantages: shell side cleaning is more difficult and heat exchange area per unit volume is relatively small.

Common subtypes and application scenarios: including shell and tube type, coil type, and coaxial type, etc., are widely used in heavy industries such as petrochemical, power, metallurgy, and shipbuilding. For example, oil cooling in oil refineries and heat exchange in reaction vessels of chemical plants. It is also one of the heat exchanger types with the largest demand in foreign trade exports.

Core definition: Using thin metal plates as the heat transfer surface, multiple corrugated plates are arranged in parallel and sealed to form alternating flow channels, where hot and cold fluids exchange heat in countercurrent flow on both sides of the plates.

Key features: compact structure (heat exchange area per unit volume is 2-5 times that of tubular type), high heat transfer efficiency, easy to disassemble and clean, flexible assembly and heat exchange area can be adjusted as needed; disadvantages: limited temperature and pressure resistance (usually pressure ≤2.5MPa, temperature ≤200℃), insufficient adaptability to scenarios with large processing capacity.

Common subtypes and application scenarios: including flat plate type, spiral plate type, etc., suitable for scenarios with compact space and frequent cleaning, such as food and beverage processing, pharmaceuticals, civil air conditioning, small and medium-sized chemical equipment. In foreign trade, they are mostly used for orders in light industry and civil fields.

Core definition: Using a heat pipe with high thermal conductivity as the core heat transfer unit, heat is rapidly transferred through the "boiling and vaporization-steam flow-condensation and reflux" cycle of the working fluid inside the heat pipe, making it a new type of high-efficiency and energy-saving device.

Key features: extremely high heat transfer efficiency, capable of transferring a large amount of heat under very small temperature differences, good isothermal properties, simple structure, long service life, and adaptable to various heat exchange forms such as gas-to-gas and gas-to-liquid; disadvantages: fixed applicable temperature range, relatively high cost, and difficult maintenance after leakage.

Common subtypes and application scenarios: According to the operating temperature, heat pipes can be divided into low temperature, medium temperature and high temperature heat pipes. They are suitable for low temperature difference heat transfer and waste heat recovery scenarios, such as electronic equipment cooling, HVAC, industrial waste heat recovery and new energy fields. In foreign trade, they are the core category of high value-added and technology-based orders.