A scraped surface heat exchanger was created to improve on the faults of their predecessors. The internal mechanism of scraped surface heat exchangers periodically removes products from the heat transfer wall. This process is considered direct heat transfer, and they use either a flat surface or tube. The goal of the machine is to exchange an exact amount of heat per unit area. This is done by generating a great deal of turbulence. The system consistently corrupts the plates or tubes by extending their surface with fins.
It is crucial to keep in mind that the geometry conformation technologies calculate optimum mass flows, as well as other factors related to turbulence that become diminished at the presence of fouling. Because of fouling, designers are often obliged to fit much longer heat transfer areas.
Different types of fouling include:
- Particulate Accumulation
- Generation of Ice Layer
Scraped Surface Heat Exchangers
Another common factor that poses difficulties in heat transfer is known as viscosity. A highly viscous fluid generates deep laminar flow. It is a condition that has reduced heat transfer rates as well as high-pressure losses that involve considerable pumping power. This often exceeds the exchange design limits.