What would NOT be a recommended distribution in an overfeed evaporator?

In an overfeed evaporator, the goal is to ensure efficient heat transfer and optimal performance. A vertical distribution with horizontal heat transfer is not recommended because this configuration can lead to uneven distribution of the refrigerant or fluid across the evaporator surface. When the refrigerant or fluid is distributed vertically while attempting to achieve horizontal heat transfer, it may cause issues like poor contact between the fluid and the heat exchange surface. This can result in areas of the evaporator not reaching desired temperatures, impacting overall system efficiency.

On the other hand, top feeding methods generally facilitate the even distribution of flow and ensure better utilization of the surface area, without the complications that a vertical distribution may introduce. Horizontal distribution with vertical heat transfer is also a suitable method, as it allows for more consistent flow across the heat exchange surfaces. Similarly, bottom feeding with recirculated systems supports continuous movement of the refrigerant, enhancing thermal contact and improving efficiency.

In contrast, the other options have configurations that either utilize gravity and flow dynamics effectively or ensure that the heat transfer surface is adequately covered, which aligns with best practices for operating overfeed evaporators.