Evaporator Coil for R744 System With Cooling Capacity of 300 kW

Evaporator Coil for R744 System With Cooling Capacity of 300 kW

In an R744 system, liquid carbon dioxide flows into the evaporator coil, where it begins to evaporate under low pressure, absorbing heat. This lowers the temperature of the coil surface and surrounding area. The medium to be cooled (such as air or a refrigerant) exchanges heat with the coil through a fan, transferring heat to the carbon dioxide within the coil, causing it to continue evaporating into a gaseous state, achieving cooling. The gaseous R744 is then drawn into the compressor and enters the next stage of the refrigeration cycle.

Due to R744's high volumetric cooling capacity, it requires less flow for the same cooling capacity than traditional refrigerants. Therefore, the evaporator coil typically uses relatively small diameter pipes and a larger number of tube rows. This allows for efficient heat transfer within a smaller space and complies with the flow characteristics of the R744 system.

Enhanced heat exchange structure: To improve heat exchange efficiency, the evaporator coil often features specially designed fins, such as corrugated fins or windowed fins. Internally threaded tubes are also used. These increase the heat transfer area and disrupt the fluid flow, enhancing heat transfer.