Why is the heat transfer efficiency of spiral plate heat exchangers so high
The high heat transfer efficiency of spiral plate heat exchangers is mainly due to the following reasons:
1. Advantages of mobility methods
Pure counterflow flow: Two heat transfer media in a spiral plate heat exchanger can undergo full counterflow flow. Compared with other flow modes, counterflow can maintain a large temperature difference between cold and hot fluids throughout the entire
The high heat transfer efficiency of spiral plate heat exchangers is mainly due to the following reasons:
1. Advantages of mobility methods
Pure counterflow flow: Two heat transfer media in a spiral plate heat exchanger can undergo full counterflow flow. Compared with other flow modes, counterflow can maintain a large temperature difference between cold and hot fluids throughout the entire heat transfer process, resulting in a large logarithmic average temperature difference, which is conducive to heat transfer. Even with two small temperature difference media, ideal heat transfer effects can be achieved, enhancing the heat transfer efficiency.
Flow channel design: The fluid flows in a spiral channel, generating centrifugal force to increase the turbulence of the flow field. Even under low Reynolds number conditions, turbulence can be formed, which is beneficial for heat transfer. The curvature of the spiral channel is uniform, and there is no significant turning of the liquid flow inside the equipment. The local resistance is small, which can increase the design flow rate. Increasing the flow rate can increase the heat transfer per unit time, thereby improving the heat transfer capacity.
2. Structural design advantages
Large heat transfer area: Made of two metal plates rolled together to form two uniform spiral channels, the structure is compact, and the heat transfer area per unit equipment volume can reach 150m 2/m 3, increasing the contact area between cold and hot fluids and making heat transfer more complete.
The function of a fixed distance column: The presence of a fixed distance column destroys the boundary layer, causing vortices in the fluid flow process, increasing the degree of fluid disturbance, and strengthening the heat transfer process.
3. Advantages of heat transfer characteristics
Uniform temperature distribution: The fluid undergoes multiple rotations in the spiral channel, resulting in a longer flow path. Radial flow and axial disturbances reduce the temperature gradient, leading to a more uniform fluid temperature and improving heat transfer efficiency.
Small heat loss: Spiral plate heat exchangers usually have a small outer surface area and two channels are sealed by welding. As long as the welding quality is guaranteed, there will be no leakage between the two media, reducing the possibility of heat dissipation to the external environment and enabling more effective heat transfer between cold and hot fluids.
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