How To Spec Your Store
So now that you have decided to choose Polycool how do you decide how many units you need to service your grain store.
This is a simple calculation using the following formula:
CEREALS
STORAGE DEPTH X 2 = THE DIAMETER OF THE CIRCLE WHICH EACH UNIT WILL VENTILATE
OSR
STORAGE DEPTH X 1.75 = THE DIAMETER OF THE CIRCLE WHICH EACH UNIT WILL VENTILATE
For example if your cereal crop is stored at 3m depth, then each pedestal will ventilate a 6m diameter circle. This means that the pedestals can be spaced 6m apart from each other and 3m from the side or back walls of the store. Uneven storage heights will need to be averaged out to obtain a representative depth across the store.
The chart below will allow you to calculate how many fans you will need for your Polycool pedestals based upon your intended storage depth.
Guide to Pedestal: Fan Ratio
| Storage Depth | % Example Moisture Content (Cereals) | Pedestal:Fan Ratio |
|---|---|---|
| 2.5-3.5M | 16 | 4:1 |
| 3.6-4.5M | 16 | 3:1 |
| 4.6-5.5M | 16 | 2:1 |
| 5.6M + | 16 | 1:1 |
As crop moisture contents rise above the stated 16% the stored crop is much more prone to heating up quickly. Extra fans may be required in these situations.
