FUNKE heat exchangers mainly include brazed plate heat exchangers, shell and tube heat exchangers, air-cooled heat exchangers, and other types,

Technical principle:

Brazed plate heat exchanger

Thermal conduction: Heat is conducted through the brazing layer between the plates. The brazing layer is composed of high thermal conductivity metals such as copper, nickel, etc. It has good fluidity in liquid form and can fill the gaps between the plates, forming a continuous heat transfer surface. When heat is transferred from one side of the plate to the other, the metal atoms in the brazing layer vibrate to produce phonons, which propagate in the lattice and conduct heat from the high temperature side to the low temperature side

Convection heat transfer: Convection heat transfer between fluid and plate surface is an important heat transfer method. When the fluid flows through the surface of the plate, due to fluid viscosity and molecular collision, the fluid will take away heat from the plate surface and be obstructed by the plate surface to form a vortex flow, enhancing the heat transfer effect between the fluid and the plate surface and improving the heat transfer efficiency

Radiation heat transfer: Radiation heat transfer plays a role in high-temperature or long-distance heat transfer processes. When a high-temperature fluid flows through the surface of a plate, some of the heat is transferred to the low-temperature fluid in the form of radiation. After absorbing heat, molecules in high-temperature fluids radiate heat outward in the form of electromagnetic waves, which are then absorbed by low-temperature fluids, allowing them to obtain heat

Capillary flow: Due to capillary action, liquid solder will flow in the gaps between the plates, filling small gaps and forming a continuous heat transfer surface. It can also form a uniform coverage on the plate surface, improving heat transfer efficiency

Shell and tube heat exchanger

Thermal conduction and convective heat transfer: One medium flows inside the tube, while the other medium flows inside the shell outside the tube, and the two media exchange heat through the tube wall. Heat is first transmitted through the heat conduction of the pipe wall, from the high-temperature side to the low-temperature side, and then further transferred to the entire fluid through convective heat exchange in the fluid inside and outside the pipe, thereby achieving heat exchange

Structural design enhances heat transfer: By installing baffles and other structures inside the shell, the flow direction of the shell side fluid is guided, causing it to cross the tube bundle multiple times, increasing the turbulence level of the fluid and improving the convective heat transfer coefficient, thereby enhancing the heat transfer effect. Reasonable design of the arrangement, diameter, and length of the tube bundle can also optimize heat transfer performance

Air-cooled heat exchanger

Thermal conduction and convective heat transfer: The core structure includes a heat transfer core and a fan. The heat exchange core is usually made of aluminum or copper material and designed with multiple layers of thin sheets. Heat is first transferred from the heating object to the heat exchange core through thermal conduction, and then transferred from one side of the heat exchange core to the other through natural or forced convection of air, achieving heat exchange. The fan generates airflow, carries away the heat from the heat exchange core, and discharges it into the environment

Optimizing design to improve performance: using more efficient heat transfer materials, optimizing the design of airflow channels, adding shock and noise reduction designs, etc., to improve heat transfer efficiency, reduce noise, extend service life, etc

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