Grain pedestal question.

[Daniel]

Is it better to have a fan on each pedestal to pull the grain temp down. Or, a fan on one pedestal thus pulling colder air down thw other one?

 

[Barleymow]

I have a fan on each one to save moving then about,point outlets away from each other

 

[Clive]

More fans the faster you will cool

also, nice to not have to keep moving them

 

[Daniel]

Ok thanks.

 

[JD6920s]

Is it better to have a fan on each pedestal to pull the grain temp down. Or, a fan on one pedestal thus pulling colder air down thw other one?

You need to pull the air through the crop, not the next pedestal!
If you don’t have enough fans any pedestals without one must have a cap on it, I use plastic dust sheets to make the fan pull from further out to cool more tonnage.

 

[Shutesy]

If you don’t have enough fans any pedestals without one must have a cap on it.

Did not know that, learn something everyday

 

[e3120]

Going against the common view, but there might be logic in the suggestion. If the pedestals are a bit further apart than the classic inverted dome pattern then a blowing one or uncapped open one should create horizontal airflow near the bottom of the heap, where the biggest challenge is. I'd definitely want the exhaust going out of the building, though.

Thought provoking

 

[Bovril]

Air will always travel the path of least resistance. If you have an uncapped pedestal, the air will just travel from that to the fan, leaving uncooled grain the other side...

 

[Chap]

This is how I do mine. 6 plus metre length of pipe through hole saw in side tin. All hot humid air blown outside and keeps air inside shed at low temperature Instead of circulating hot air through grain. Cools a lot quicker than blowing into air inside shed

 

[Daniel]

This is how I do mine. 6 plus metre length of pipe through hole saw in side tin. All hot humid air blown outside and keeps air inside shed at low temperature Instead of circulating hot air through grain. Cools a lot quicker than blowing into air inside shed

This shed has a gable end fan to pull the exhaust air out.

 

[Brisel]

This shed has a gable end fan to pull the exhaust air out.

Is there a vent at the other end to let air in to help the flow across the heap?

 

[jon9000]

Really struggling with bugs this year in the hot spots so have bought a screw in one to go inbetween the pedeststals. Venting to the outside looks like a good indea

 

[DanniAgro]

This shed has a gable end fan to pull the exhaust air out.

That's my setup, and I also aim the fans output so that they points towards the exhaust fan, crudely helping to aid the removal of hot air.
Cool air flows in around the whole of the edge of the store where the vertical sheets leave a gap against the concrete slabs.

 

[Daniel]

Is there a vent at the other end to let air in to help the flow across the heap?

No, and the shed has been spray foamed at some point as it was an onion store, which has sealed any gaps at the eaves. But i'm guessing there is enough leakage around the sliding doors the opposite end?

 

[DanniAgro]

Is there a vent at the other end to let air in to help the flow across the heap?

Hopefully, as the air flows from all the top of the concrete slabs, there'no need for another fan. I would think that unless the side sheets up to the roof fit tightly against the slabs there is no need for an inlet fan.

 

[DanniAgro]

After seeing Daniels reply, he may need anm inlet fan if there's no gap.

 

[neilo]

It would certainly make a mess if he sucks the sides of the shed in...…..

 

[DanniAgro]

This is how I do mine. 6 plus metre length of pipe through hole saw in side tin. All hot humid air blown outside and keeps air inside shed at low temperature Instead of circulating hot air through grain. Cools a lot quicker than blowing into air inside shed

Seems like a good idea. How many pedestals do you have in your store?

 

[Chap]

8 when it’s full. IMO a lot more efficient than blowing hot air into shed to recirculate through heap

 

[yellow belly]

The most important part is enough ventilation for the number of fans
if it is good then more fans ok
this year I used a 12in 6m long culvert pipe to the out side of the shed worked well on a he’d in a sheltered yard
I have 4 fans on a shed with 18 pedestals but good ventilation one frosty week and the grain is at 5 degrees