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| Going to switch my heat vac cool super b dryer to full heat in an effort to speed up harvest.
Is there some sort of chart for what temp and moisture you dump out of the dryer to hit a specific moisture in the bin. Have 2 36 foot bins with 12.5 hp fans and roof fans that I can use. Want to hit 14.5 to 15 percent in the bin. Never done full heat drying before.
Thanks. |
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North west MN | Not sure about your setup but if I put in bin to cool it ususally drops a couple points but it takes a while |
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North central Iowa | You will remove 2 points if you let it steap for a few hours and then cool we run that way most of the time |
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SW Illinois | For every 10 degrees that you cool the corn in the bin, it will remove .25 point of moisture. For example, if you transfer at 16.5% with a grain temperature of 120 degrees, you will need to cool the corn in the bin to 60 degrees to remove the last 1.5%. It can be a moving target, depending on the outside air temperature. If it's really cold and you can cool the corn in the bin a lot, you can transfer at a higher grain temperature and moisture, speeding things up. If it's very warm outside and you won't be able to cool much in the bin, you'll have to transfer at a lower moisture and grain temp because you can't plan on removing much through cooling. Clear as mud? |
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Springfield, MN | I have the AS-400 dryer and yes its too small so I have been dumping hot for years. I have a 30'bin with only aeration H pattern in the floor. What I have been doing is drying and cooling 1 ring in the bin and then start dumping hot after that. My cooling fan is 1 1/2 hp. I cool 4 to 5 minutes in the dryer first before dumping to cool the burner. |
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Alton, Ia | We run at 17.5 MC, grain temp ~140 or so, into large storage bins with app 10 HP fan per 40K of storage, consistently deliver 15-15.3 MC corn. |
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N.W. Illinois | What do you have for a moisture tester? Most testers will not give a accurate reading much over 100 degrees of grain temp. I've found it easiest to cool the corn for a short while (whether spreading it out on a scoop, fine mesh screen, whatever) to kind of give you a general idea of your discharge corn moisture. Cooling the grain with air in the bin will usually remove more moisture. The best way to get a accurate reading is if you can pull a sample of the corn from the bin once it's cooled and test it. I then get a good idea what the discharge temp of the hot corn needs to be and use discharge temps to determine what the corn moisture will end up to be.
I've also found the wetter the grain coming out of the field the higher the discharge temp the hot corn will be coming out of the dryer. I've had discharge temps of 145 plus degrees before when drying 25% plus moisture corn. Under 20% the discharge temp might only be 125 degrees or less.
Finally pull the center of your bins when you have finished drying and move it around some. The last bit of corn going into a bin can be difficult to cool along with any fines that are in the center of the bin. A crust can form quickly which becomes a big pain in the butt. Hot centers in bins are the cause of most tragedies from farmers being buried in grain in bins. |
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Floyd County, Iowa | I transfer hot, and cool in the bin.
It depends on the year. Some years it dries more, some years less, after transfer/cooling.
I write it down in my manual each year what the moisture is going in, and going out of the dryer. (edit: I also write down what dryer temp is set at and meter roll settings) That's my starting point for the year. Tweak it from there.
I hang my sample in a cloth bag in front of the dryer fan to cool it, then test it. I usually figure an additional point will be removed by the slower cooling in the bin, compared to the quick cooling in front of the fan, but this way I know what I'm going to end up with.
I'm attaching a pic I took this year, and it shows the sample bag on the dryer fan.
Edited by oldbones 11/6/2016 13:31
 (samplebag.JPG)
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 samplebag.JPG (98KB - 287 downloads)
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Schlegel Farms, Hagerstown Indiana | A lot of good advice.
I might add that you can dry the corn to fast if you aren't careful. I have one bin that is actually set up to air dry beans (big fan) so if I ever put corn in that bin, I fill the bin about half full before I start the fan.
You want the heat from the corn on the bottom to finish drying the corn above so you don't want to bloy the heat out to fast. |
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| This is the chart we use for dumping hot. Use a meat thermometer to check temp.
Test hot corn for moisture, test hot corn for temperature, take temperature that you get and take the the number from the chart that coincides with the temperature and subtract what you got for moisture that will give you what your final cooled moisture will be. Have been doing it this way for years.
Edited by fastdeere 11/6/2016 12:48
 (14784577652650.jpg)
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14784577652650.jpg (55KB - 620 downloads)
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| This my concern. I am drying 140 out 20 percent to 15.5 percent dryer in super b 20 . Tested with a commercial grain tester doing about 750 bu an hour so with 10 hp fans am I cooling to fast to count on removal of under 15 percent for winter storage. |
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indiana | Mark I agree with you about slower cooling removes more moisture. We have some bins with 2 big fans (to air dry corn) and if I dump hot into those I only run 1 fan to cool. |
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SW Illinois | That depends on the size of the bin. Shivvers recommends 1 hp/5000 bushels of bin capacity for cooling. If your fan is too big, you can transfer hotter and wetter and wait several hours before starting the fan. That lets the grain steep and you can remove more moisture and still end up at the right moisture. |
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| fastdeere,
what is the factor column for? |
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Southwest Ontario | Your fans are too big but you can make them work by turning them on and off hours apart |
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ND | Been drying only for two yrs this before air drying for 20 yrs. Small FF AB-190 dryer, heat at 220 deg, dryer dumps every hour, continuous flow, 18 to 19 % corn going in, coming out hot at 16 to 16.5% air blower system to bin, full floor drys down to 14.5% or less-run bin fan for 7 days with a 10-15 hp in line centrifugals. |
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Full heat corn drying and cool down in bin
