Geaps amarillo 1_18_07
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Transcript of Geaps amarillo 1_18_07
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Carol Jones, PhD.Stored Product EngineeringBiosystems and Ag. Engr. Dept.
Grain Aeration,“Just the Basics, Ma’am”
Tri-State GEAPS WorkshopAmarillo, TX
Jan. 18, 2007
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Carol Jones, PhD.Stored Product EngineeringBiosystems and Ag. Engr. Dept.Stillwater, OK
Why Do We Aerate?
•Condition grain by cooling to safe level for storage
•Uniform cooling prevents moisture migration
•Very powerful IPM tool•With more air, used for grain
drying
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Carol Jones, PhD.Stored Product EngineeringBiosystems and Ag. Engr. Dept.Stillwater, OK
Aeration as IPM Tool
•Control insects by cooling to < 60° F
•15°F drop (ex: 90° to 75 °) reduces activity 50 – 75%
•Very powerful IPM tool•Aeration = Crop Insurance!!
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Carol Jones, PhD.Stored Product EngineeringBiosystems and Ag. Engr. Dept.Stillwater, OK
Suggested Plan for Southern States
•At binning, cool to mid 70’s using nighttime air
•Mid September, aerate second time to low 60’s
•Can prevent the need to fumigate•Eliminates insect population
buildup and damage
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Carol Jones, PhD.Stored Product EngineeringBiosystems and Ag. Engr. Dept.Stillwater, OK
Suggested Plan for South•General suggested rates:
–Steel bins and flat storage: 0.1 cfm/bu (1/10th cfm/bu)–Concrete upright bins: 0.05 cfm/bu (1/20th
cfm/bu)•For southern states:
–0.2 cfm/bu at least, 0.25 to 0.3 is best if affordable
•At 0.3 cfm/bu: takes 30-35 hours of nighttime cooling to drop 15° in summer
•Expect wheat shrinkage of about 0.8%
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Carol Jones, PhD.Stored Product EngineeringBiosystems and Ag. Engr. Dept.Stillwater, OK
General Design Factors…What to consider
•Grain Type (coarse vs. small)
•Location/harvest date
•Storage structure
•Available energy
•Cooling speed vs. energy cost
(cool as fast as you can afford)
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Carol Jones, PhD.Stored Product EngineeringBiosystems and Ag. Engr. Dept.Stillwater, OK
Specifics…What to consider
•Airflow rate (fast is better …insurance)
•Grain airflow resistance–Wheat static pressure = 2x corn or soybeans
•Propeller vs. centrifugal fan type •Airflow direction (suction or
pressure)•Distribution (ducts or perforated
floor)•Control (manual or automatic)
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Carol Jones, PhD.Stored Product EngineeringBiosystems and Ag. Engr. Dept.Stillwater, OK
Components•Fans•Ducts…transition and supply•Floor distribution system•Roof vents, exhaust fans•Controls for fan regulation•Pressure switch on fans for negative
pressure systems
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Carol Jones, PhD.Stored Product EngineeringBiosystems and Ag. Engr. Dept.Stillwater, OK
Calculating Cycle Time
AT = aeration time, hours/cycle
AR = airflow rate, cfm/bu
TW = test weight, lb/bu
15
60
TWAT x
AR=
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Carol Jones, PhD.Stored Product EngineeringBiosystems and Ag. Engr. Dept.Stillwater, OK
Cycle Time, Flow Rate, and Test Weight
050
100150200250300350400450500
32 48 56 60
Test Weight (lb/bu)
Aer
atio
n C
ycle
(h) 0.025
0.050.10.20.250.50.751
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Carol Jones, PhD.Stored Product EngineeringBiosystems and Ag. Engr. Dept.Stillwater, OK
Airflow vs. Pressure Drop
0
0.5
1
1.5
2
2.5
3
1 2 3 4 5 6 7 8 9 10 20 30 40 50 60 70 80
Airflow (cfm/ft^2)
Pres
sure
Dro
p (in
ch/ft
)
Wheat
Sorghum
Corn
Soybeans
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Carol Jones, PhD.Stored Product EngineeringBiosystems and Ag. Engr. Dept.Stillwater, OK
Positive or Negative Airflow
•Negative Airflow:–Pros…
•Reduced condensation under steel roofs
•Cooling zone movement estimated by fan exhaust air temperatures
•Can hold covers on outdoor grain piles–Cons…
•Needs larger transition/duct cross-section areas (especially in flat storage)
•Roof damage if vents freeze (use neg. pressure switch)
•Top grain heat moves through all grain
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Carol Jones, PhD.Stored Product EngineeringBiosystems and Ag. Engr. Dept.Stillwater, OK
Positive or Negative Airflow
•Positive Airflow:–Pros…
•Distribution in flat storage is more uniform
•Add warm grain w/o heating cool grain•Aeration zone finished when surface
grain cools•Less plugging of perf. floors or ducts
–Cons…•Condensation under steel roofs•Heat of compression raises air temp.
3-10° F
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Carol Jones, PhD.Stored Product EngineeringBiosystems and Ag. Engr. Dept.Stillwater, OK
Fans
•Centrifugal and axial
•Use FANS program from Univ. of
Minnesota or Purdue
•Factors: power, efficiency, multiple fans in series or parallel
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Carol Jones, PhD.Stored Product EngineeringBiosystems and Ag. Engr. Dept.Stillwater, OK
FansAxial
– Van-axial– Tube-axial (small - 2Hp or less)– Low cost, noisy– 3 – 5 inches static pressure
Centrifugal– 1460 to 3500 rpm– Higher cost– Quieter– More airflow per HP above
5” static pressure
Fan Performance…consult manufacturerinfo. Sheets, AMCA certification is best info.
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Carol Jones, PhD.Stored Product EngineeringBiosystems and Ag. Engr. Dept.Stillwater, OK
Fans
0
2000
4000
6000
8000
10000
12000
14000
16000
18000
0 2 4 6 8 10 12 14
Static Pressure (in of H20)
CFM
vane axial
low speedcentrifugal
high speedcentrifugal
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Carol Jones, PhD.Stored Product EngineeringBiosystems and Ag. Engr. Dept.Stillwater, OK
Fans – selection in a nutshell
•Optimum performance
•Efficiency based on cfm/hp
•Noise, cost, reliability, mounting dimensions, space
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Carol Jones, PhD.Stored Product EngineeringBiosystems and Ag. Engr. Dept.Stillwater, OK
Air Distribution Systems
Consist of…–Transitions, manifolds, supply ducts
–Perforated ducts, pads or false floors
–Roof vents or exhaust fan systems
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Carol Jones, PhD.Stored Product EngineeringBiosystems and Ag. Engr. Dept.Stillwater, OK
TransitionsTransition smaller than air duct tunnel is BEST!
Transition
Air Tunnel
Foundation
Fan
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Carol Jones, PhD.Stored Product EngineeringBiosystems and Ag. Engr. Dept.Stillwater, OK
Transition/Supply Duct Air Velocities
•Maximum design air velocity…–positive pressure: 2500 fpm–negative pressure: 2000 fpm
•Preferred design air velocity…–positive pressure: 1500-2000 fpm–negative pressure: 1000-1500 fpm
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Carol Jones, PhD.Stored Product EngineeringBiosystems and Ag. Engr. Dept.Stillwater, OK
Perforated Distribution Duct Velocities…
•Upright storages: 2000 fpm
•Flat storages: 1500 fpm
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Carol Jones, PhD.Stored Product EngineeringBiosystems and Ag. Engr. Dept.Stillwater, OK
Airflow Path Ratio
A + B <= 1.5 C
C: duct to grain peak
A + B … longest pathA
C
C
B
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Carol Jones, PhD.Stored Product EngineeringBiosystems and Ag. Engr. Dept.Stillwater, OK
Round Bin Floor Layouts
Square “Y” ..
Pad.
Double “T”
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Carol Jones, PhD.Stored Product EngineeringBiosystems and Ag. Engr. Dept.Stillwater, OK
More Floor Layouts – Large Bins
Double “H” Quad “F”
Double Pad
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Carol Jones, PhD.Stored Product EngineeringBiosystems and Ag. Engr. Dept.Stillwater, OK
Vertical Aerator …Big Bins with Dia:Sidewall > 2.5:1
50'46'
69'
50'81'
20'
50'
70'
35' 1/4 Dia. =
89'
73'65'
45'
61'
Radius
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Carol Jones, PhD.Stored Product EngineeringBiosystems and Ag. Engr. Dept.Stillwater, OK
Perforated Floors
Cereal Grains: 3/32” diameter perf.
Smaller Seeds: 3/64 to 1/16”
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Carol Jones, PhD.Stored Product EngineeringBiosystems and Ag. Engr. Dept.Stillwater, OK
Coring to Improve Aeration
Can reduce cooling time and costs up to 30%
Day 1 Fil l
Day 2 Fil l
Day 3 Fil l
Day 4 Fil l
Day 5 Fil l
Day 6 Fil l
Core
1 / 4 to 1/ 3
of bin diameter
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Carol Jones, PhD.Stored Product EngineeringBiosystems and Ag. Engr. Dept.Stillwater, OK
Flat Storage Duct Layout
Up to 100 ft
70 to 90 ft
50 to 70 ft
Up to 150 ft
c
c
90 - 150 ft
Repeat Pattern -- No Limit
•Less airflow under valleys•More airflow under peaks•Requires non-uniform
distribution to get uniform delivery!!!
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Carol Jones, PhD.Stored Product EngineeringBiosystems and Ag. Engr. Dept.Stillwater, OK
What about Hopper Bins?Half-round Duct for Hopper Bin
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Carol Jones, PhD.Stored Product EngineeringBiosystems and Ag. Engr. Dept.Stillwater, OK
Roof Venting
•Pressure System needs exhaust vents–1 ft2 cross-section area per 1000-1500 cfm
•Suction System needs inlet vents–1 ft2 cross-section area per 800-1000 cfm
•Keep static pressure in bin head space to 1/8” or less
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Carol Jones, PhD.Stored Product EngineeringBiosystems and Ag. Engr. Dept.Stillwater, OK
Vent Types
•Gooseneck Vents
•Mushroom Vents
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Carol Jones, PhD.Stored Product EngineeringBiosystems and Ag. Engr. Dept.Stillwater, OK
Roof Exhausters Types
•Power Vents–200 – 250% of aeration rate–Run when aeration is on plus 15-20 minutes
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Carol Jones, PhD.Stored Product EngineeringBiosystems and Ag. Engr. Dept.Stillwater, OK
Controllable Roof Vents
•Normally closed
•Designed to open under pressure or vacuum
•Interlocked electrically with fans
•Reduces insect infiltration
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Carol Jones, PhD.Stored Product EngineeringBiosystems and Ag. Engr. Dept.Stillwater, OK
Fan Controllers
•Temperature limit thermostats•Humidity control•NEMA 4R housing•Hour meter, selector switch•Time delay relays (TDR) for multiple
fans•Off-the-shelf components
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Carol Jones, PhD.Stored Product EngineeringBiosystems and Ag. Engr. Dept.Stillwater, OK
RH and Temp Controllers
Partial list of vendors–OPI–The Boone Group–AgriDry Rimik Pty–GSI–Caldwell/Chief-Agri
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Carol Jones, PhD.Stored Product EngineeringBiosystems and Ag. Engr. Dept.Stillwater, OK
Cost Estimates
•Aeration System: 6.0 – 12.0 ¢/bu•Controller:0.3 – 1.0 ¢/bu•Temperature Cables:0.3 – 1.0 ¢/bu
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Carol Jones, PhD.Stored Product EngineeringBiosystems and Ag. Engr. Dept.Stillwater, OK
Monitoring Systems
•Manual Readout and log book
•Data Logger with manual plug in to thermocouples
•Computer interfaced automatic monitoring
Least expensive
Most expensive
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Carol Jones, PhD.Stored Product EngineeringBiosystems and Ag. Engr. Dept.Stillwater, OK
OPIGIMAC Temperature and Insect Monitoring, Aeration Fan Control System
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Carol Jones, PhD.Stored Product EngineeringBiosystems and Ag. Engr. Dept.Stillwater, OK
More New Technology
•Closed Loop Aeration working with CLF system in sealed storage
•Cross-Flow Aeration–As much as 30% less power than vertical airflow
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Carol Jones, PhD.Stored Product EngineeringBiosystems and Ag. Engr. Dept.Stillwater, OK
More New Technology
•USDA Electronic Insect Monitoring System now commercialized by OPI as “the Insector”
•Purdue Univ. working on a mold sniffing system to detect development of mold by CO2 detection
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Carol Jones, PhD.Stored Product EngineeringBiosystems and Ag. Engr. Dept.Stillwater, OK
Info-Sites
http://www.biosystems.okstate.edu/home/jcarol/
http://www.biosystems.okstate.edu/sare/
Acknowledgements:USDA and Cooperative State Research Education and Extension ServiceDr. Ron Noyes, Grain Storage Engineering, LLC, Stillwater, OK (OSU Professor Emeritus)