In chemical cooling water circuits or intermediate heat exchange stages of HVAC systems, design and selection engineers often need to achieve the target heat transfer load within a limited pressure drop budget. The selection process for the BR-60 plate heat exchanger is essentially about finding a balance among heat transfer efficiency, pressure drop, and equipment durability, in which the corrugation pattern, plate quantity and pass arrangement, and anti-corrosion treatment of frame clamping bolts are the aspects that need to be confirmed one by one.
Corrugation Pattern: Pressure Drop Differences Between Herringbone and Horizontal Straight Patterns
The commonly used herringbone corrugated plates of the BR-60 plate heat exchanger enhance the heat transfer coefficient by increasing fluid turbulence, but the flow channel resistance increases accordingly, and pump power consumption rises. When the medium is high-viscosity oil or the allowable pressure drop is small, horizontal straight corrugated plates are more suitable; their flow channels are smoother and pressure drop is lower, while the heat transfer coefficient is lower than that of herringbone plates. During selection, the corrugation pattern should first be preliminarily determined according to medium viscosity and allowable pressure drop, and then the heat transfer area should be checked to see whether it meets the heat load requirement.
Plate Quantity and Pass Arrangement: Two Means of Adjusting Cooling Load
In a scenario where a certain cooling load needs to be matched, this can be achieved by increasing or decreasing the number of plates or by changing the pass arrangement. Increasing the number of plates can expand the heat transfer area, but a decrease in flow velocity may cause the heat transfer coefficient to drop; adopting a multi-pass arrangement can increase the inter-plate flow velocity and enhance heat transfer, while pressure drop rises at the same time. In actual selection, it is necessary to balance heat transfer efficiency and pump power consumption. It is recommended to perform simulation calculations based on specific operating parameters rather than relying only on empirical estimation.
Frame Clamping Bolts: Durability Details in Humid and Corrosive Environments
The clamping bolts of the BR-60 plate heat exchanger frame remain for a long time in humid environments or environments containing corrosive gases, and their material and anti-corrosion treatment directly affect the convenience of disassembly and maintenance. During selection, attention should be paid to the material grade and surface treatment method of the bolts to avoid uneven clamping force or difficulty in disassembly caused by rust corrosion. If the installation location is close to a cooling tower or there is a chloride ion atmosphere, bolt materials with better corrosion resistance should be selected, and the clamping dimensions should be checked regularly.
Comparative Approach to Selection Sequence
First determine the corrugation pattern, then calculate the plate and pass arrangement, and finally check the material and anti-corrosion treatment of the clamping bolts. This sequence can reduce repeated adjustments. Compared with the approach of first selecting the number of plates and then changing the corrugation, the former makes it easier to control the matching of pressure drop and pump power consumption. For working conditions that are pressure-drop sensitive or involve higher medium viscosity, a horizontal straight corrugation combined with a multi-pass arrangement, compared with a herringbone solution that simply increases the number of plates, often shows different results in operating energy consumption, and judgment should be made after simulation according to specific parameters.
