How it works
The oil used to cool machinery is selected based on its viscosity in the anticipated operating temperature range in addition to other lubrication characteristics. The viscosity is crucial in the thermal design as it is a determining factor in the calculation of tube-side heat transfer rate.
In systems with low velocity and high viscosity, heat transfer enters the lamina regime where heat transfer coefficients are low. We can adopt two alternative design approaches:
- Increase passes and thereby increase velocity to maintain turbulent flow, and with it, higher coefficients.
- Introduce turbulators to ensure enhanced flow characteristics.
The limitation of these approaches is the available tube-side pressure drop. However, there is significant flexibility in the specification of turbulators. Dense windings have high enhancement factors and high-pressure drop per unit length. If pressure limits are exceeded, we can reduce the winding density to bring the design within available pressure drop limits.
Airside characteristics depend on the type of fan permitted in the environment. For safe areas, non-corrosive environments, plate mounted fans are an economical option. But, where corrosive or hazardous areas are indicated, we have broad experience in fan selection and specification.
If you feel you need another type of cooler, visit our products and services page or contact us.