I have been working in the field of Precooling and High Humidity Cold Stores for various Fruits and Vegetables. Studying various books and seeing the installed plants, I find that the system where the air in the Cold Rooms are being sucked in and blown over bare tube coils, and water in being sprayed or spilled over the coils and the air containing the water droplets are being supplied to the room are being considered as more efficient. This system is being termed as Forced Air Cooling.

The reason for the efficiency is being claimed is that as the air is being sucked through the boxes, the cooling of the produce is better.

The air being sucked are usually propellor fans. Now what would be the static pressure so as to have a high efficiency for such aplication. Further the water moisture which is being supplied to the room are larger in size due to which they tend to settle on the card board boxes and also on the fruits and floor of the room. This tends to damage the fruit. What could be the highest humidity achieved.

I have installed plants with DX ceiling hanging . They have pull through fans and as such the velocity is higher. The surface area is much higher with more air supply. The td of the coil has been reduced and the controls have been selected properly. I have not used any additional humidifiers. The coil itself is generating the required humidity due to which the moisture articles are not only very small, but they do not tend to settle on the boxes, fruits and the floor.

The results have been good as there has been no rejection of the fruits exported so far.

Under the circumstances as stated above, which system would it be considered better.

I am asking this, as there are a large number of people in the forum who are executing similar projects . What is their experience and opinion.