Structure of Brazed Plate Heat Exchangers
Created on 04.07
1. Heat Exchange Plates
Material:Primarily 316L stainless steel; some utilize 304 stainless steel.
Thickness:0.3–0.5 mm; extremely thin, resulting in exceptionally high heat exchange efficiency.
Corrugation:Predominantly herringbone patterns, which create turbulence and provide structural support points.
Port Holes:Openings located at the four corners serve as the inlet and outlet ports for the media; no sealing gaskets are used.
2. Brazing Layer
Copper Brazing (Cu):The most commonly used method; low cost; suitable for temperatures ranging from -196°C to +225°C.
Nickel Brazing (Ni):Offers superior high-temperature resistance and corrosion resistance; suitable for temperatures ranging from -196°C to +350°C.
Brazing Method: Vacuum furnace brazing creates a metallurgical bond between the plates, ensuring a completely sealed, integral unit.
3. Casing and Connections
Features no movable frames or bolted compression structures; the entire unit forms a rigid, welded assembly.Connection Types: Threaded ports (G/RC/NPT) or small flanged ports.
End Plates:Stainless steel plates located at both ends serve protective and connecting functions.
4. Flow Channel Structure
Hot and cold media flow in alternating channels between adjacent plates.
Corrugation contact points provide mutual support, creating uniform channel gaps.
The channels are narrow with strong turbulence, resulting in an extremely high heat transfer coefficient.
Working Principle
1.Hot and cold media flow in either a counter-current or co-current arrangement within the channels between adjacent plates.
2.The corrugations induce intense fluid turbulence, resulting in an extremely thin boundary layer and minimal thermal resistance.
3.Heat is rapidly transferred through the ultra-thin stainless steel plates.
4.With no gaskets, the unit is completely sealed, eliminating the risk of internal cross-contamination or external leakage.
5.The heat transfer coefficient can reach 4000–7000 W/(m²·°C).
Advantages
1.Gasket-free, Zero Leakage:Offers significantly higher reliability compared to detachable (gasketed) plate heat exchangers.
2.High Pressure and Temperature Resistance: Capable of withstanding high pressures and temperatures, making it suitable for a wider range of operating conditions.
3.Ultra-compact and Lightweight: Features an extremely compact structure with minimal volume and weight.
4. High Heat Exchange Efficiency: Achieves high-capacity heat exchange within a small physical footprint.
5. Requires no maintenance of frames or bolts; installation is simple.
6. Vibration- and shock-resistant; suitable for mobile equipment.
7. Low cost and highly standardized; suitable for mass production integration.
8. Suitable for low-temperature operating conditions (e.g., refrigerants, ethylene glycol).
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