In a medium temperature application, how can heat transfer resistance in the evaporator be reduced?

In medium temperature applications, reducing heat transfer resistance in the evaporator can significantly enhance the efficiency and performance of the refrigeration system. One effective way to achieve this is by adjusting the superheat.

Superheat refers to the temperature of the refrigerant vapor above its saturation temperature at a given pressure. Adjusting the superheat allows for better control of the refrigerant's state as it enters the evaporator coil. By optimizing superheat, you can ensure that the refrigerant fully absorbs heat from the surrounding environment before it leaves the evaporator. If the superheat is too high, it indicates that the evaporator may not be efficiently absorbing heat, leading to increased heat transfer resistance. On the other hand, a properly adjusted superheat ensures effective heat exchange, thereby reducing resistance and enhancing the system’s overall efficiency.

While increasing refrigerant flow can potentially improve heat transfer, it might not be as straightforward or effective in all cases, particularly if the flow rate exceeds the optimal level for the system design. Lowering ambient temperatures can help with heat absorption, but it doesn't directly address heat transfer resistance within the evaporator itself. Increasing the evaporator size may provide more surface area for heat transfer but comes with increased costs and space requirements and doesn't directly reduce resistance. Thus