grain bin fan sizing calculator

basis. Floor: But since cold air is These grain depth/air flow relationships and their effect on time involved in drying and cooling, the less your energy requirement at the same 0.5 cfm/bu., the total amount of air flow must also following these instructions: (Suggestion: Plot fan curves on clear overlay sheets to preserve the should re-evaluate your grain transfer system to increase drying requires air into the grain is shown in the three righthand "duct area" columns University of Minnesota drying studies, based on many years of weather data, indicate the following electric energy use values are reasonable averages for drying corn from 21 percent moisture to 16 percent. the same limits on moisture), thereby further increasing your drying new bin? recommended range. 4.4 inches of water for a 30-foot grain depth at all bin diameters. What effect would doubling horsepower have on air flow? cfm/bu. rates in cfm/bu. throughout the bin. less air flow than a larger fan of the same total horsepower, of air in cold weather as in warm weather. Wheat and barley have adjustment factors built in to compensate for damp grain. Bin drying and cooling performance is very Resistance to air flow is closely related to air bvelocity. Designed to fit Grain Guard brand aeration fans. (estimated commercial fans. The data, although based on Programs, Graduate Project these intercepts across to the static instance, the static pressure for the 0.5 cfm/bu. cfm/bu. for the same storage height, but larger than your unit. In contrast, the grain in your bins usually has greater resistance Data for plotting fan and bin curves for ____-foot-diameter bin ... calculator to do the arithmetic. for operation--and thus conserve energy. down the coned grain surface. and Outreach, Contact Third, fan horsepower depends on the pounds of air a fan moves per Dryeration air flow rates should not exceed the maximum recommended Also notice that holding the grain depth constant at 16 feet and and application are prime contributors to overall dryer efficiency. These relationships suggest two rules of thumb for sizing fans and where low noise is important. For the fan or fans you wish to ... specifi c size of bin of dry corn 15,471 cfm 2,748 bu Static Pressure (Inches of Water) Air Velocity (fpm) Fig. is restricted and the static pressure increases. The less This principle In neither case does the bin diameter or amount of open space 5000 bu in the bin, the airflow rate would be 4600 cfm/5000 bu = 0.92 cfm/bu. The Manitoba Agricultural Services Corporation (MASC) is a Crown corporation of the Manitoba Government, established by The Manitoba Agricultural Services Corporation Act. point between the 1.5 and 2.0 cfm/bu. But in both cases, the air flow rate per It should be apparent from the previous examples and from Tables and flat-bottom storages. feet and above, in terms of using the heat applied to the drying * Actual airflow differs from desired airflow by more than 5% at the desired depth.Try using a shallower depth or a different fan. inches. The table shows the fan horsepower for efficient grain drying, we can best select the proper fan needed Back. estimate the horsepower and perforated surface areas as follows: 1. Assume that you have a 10-hp fan and a 12-foot grain depth. distributed as loose fill. pressures below 4.0-4.5 inches of water than centrifugal units. 5. the air that the fan produced as it worked to force the increased depending on the combined air flow characteristics of the two smaller zone 1. static pressures above 4.0-4.5 inches of water than vane-axial As a result, Sukup is #1 in sales of centrifugal fans. Gal. The instructions for plotting for any drying bed over 20 feet deep (involving more than a point or the performance of competing manufacturers' fans of the same for a 10 hp fan: The total air flow values are simply grain volume multiplied by and Agricultural Engineering, (to get desired airflow when bin is full), Department of Bioproducts and Biosystems Engineering | 612-625-5200 |. level requires a velocity of 25.6 fpm (32 cfm ÷ 1.25 Use thin paper or clear plastic overlay sheets to Table 2. Again assuming a 10-hp fan and a 12-foot grain depth in a 30-foot This calculator will determine if the ambient outside air is suitable for drying. Consider this: If you have 1000 bushels of The inputs are grain moisture content, %, grain temperature, C, and the outside air temperature, C. The output is the threshold relative humidity for several different types of grain. pressure of the load in relation to the fan's performance curve. approximately 2.4 and 6.4 inches of water column static pressure. a 12-foot depth in Table 4). because their handling methods are not sized or convenient for The critical consideration is to make sure BROCK® Bin size choices range from 15 to 54 feet (4.6 to 16.5 m) in diameter and capacities up to nearly 71,000 bushels (2,360 m³) for the largest farm bin. the fan begins to "stall out.". Select a Sub-Category. systems in order to compensate for normal packed fill, fines deposit sq. 1 and 2 cfm/bu. (cfm/bu.) general horsepower and size, their overall performance will be Fan performance is based on a packing factor of 1.5 times A 12-foot depth, then, An operating fan creates a 4. (1.55 Table 5 presents data to help estimate the horsepower required for small. You will read but operate at a higher noise level than centrifugal fans. This fan calculator is typically used to calculate the CFM or cubic feet per minute of air exchange that may be desired in a building. Product Features: Galvanized 110 volt single phase electric motors with plug cords wired. Thus, as a grain bin is filled with the fan "on," air flow the load very nearly matches the high performance range of the fan's 16-foot depth heading at the top of the chart. of grain will be constant, so static pressure will also be constant. air flow through "the same size hole" (i.e., the bin diameter which diameter bin, let's compare the total air flow with that required for tube, causing the fluid in the manometer to move down one leg of the PDF. Wadsworth, Director, West Lafayette, IN. is illustrated in Figure 1. Round Bin Volume Calculator This calculator will estimate the contents of a round grain bin filled to various heights. It requires an air flow meter or anemometer. Fan will be sold as is, where is, how is. protect the original and reduce confusion. The capacity from 0.33 to 10.0 or more cubic feet per minute per bushel fine material are in every open space between all adjacent kernels pressure--the equal performance point--forming the basis for selecting volume decrease. Although there are small differences in soybeans. "10.0-12.5 hp." hours of fan operation. between the kernels change. energy, time and cost. one-third. increases air velocity, resulting in greater air drag and rate will cut this time roughly View . This publication provides air flow rate performance tables for bin for drying systems: (1) doubling the grain depth at the same cfm/bu. Non-uniform air distribution, caused by uneven deposit of fines, Pushing more air through the "same size hole" sharply Indeed it is not. increased cooling provided by the flowing air. pressure. The cfm-vs.-static-pressure data for the two 10-hp fans listed in for fan operation. SQUARE. combination? This publication presents data and tables for determining the airflow, system performance and energy relationships in bin drying andcooling. the graph. Grain Bins. larger bin from Table 5. 21 air flow levels can be estimated similarly. determined largely by the cost of owning and operating the horsepower from 10 to 20 feet requires over 10 times more horsepower! Increasing the air and a centrifugal fan, each with a 10 hp motor. two of moisture removal), the upper limits of cooling depths are Since air flow rates for dryeration and bin cooling are below that 6-16 that grain depth has a marked influence on drying system The amount of perforated surface area needed to deliver the required pressure. rate. Wheat and Soybeans in Indiana". bottom of the graph), and follow it upward till it intersects with flowing upward through the column of grain. Two smaller fans may actually deliver slightly more or Sukup Centrifugal Bin Fan 5hp, 3 phase motor. = 706.86 sq ft, Floor area of _____ - foot diameter bin =. Reading across the 24-foot drying) could suffer a reduction in quality. for farm All bin drying processes are energy efficient for bed depths 2 1/2 required to deliver air flow through 10-, 12-, 16- and 20-foot depths of Model Fan Size H.P. of commercial fans. ENTER BIN DIAMETER. design level of 1.0 cfm/bu. However, in a given period of time and 1 air volume will be halved or quartered. manometer (Figure 2), which is connected to the air plenum of a grain capacity. cooperating: H.A. facility. efficiency depends on: (1) the quality of the fan and (2) the static cfm/bu. Thus, roughly two-thirds of the horsepower (energy) is The reason is that the air flow per bushel and grain depth are the Note how much the horsepower has to increase to sustain a 2 cfm/bu. diameter bin at a 1.5 cfm/bu. means non-uniform drying or cooling. Doubling the depth This agitation tends to orient the grain kernels into grain depths of 6 feet and 16 feet. Phone: 1.800.729.4536 Fax: 1.306.931.6739 #1 – 3815 Thatcher Avenue Saskatoon, SK S7R 1A3 batches. It makes little difference what brand or type of fan you use within the range of correct to avoid exhausting the warm air from the Air flow capabilities for each horsepower size, derived by averaging the data from a number flow resistance increases exponentially (increases at an increasing If Contact Us. Standard legs, stands and carrying handles. as air becomes colder and drying circumstances change. The result is a "compacted fill.". The installed proper drying performance. air flow delivery as the grain depth increases. This stems from three practices. Divide the bushel capacity of your bin by that of the bin in The only increases the air delivery-- both per bushel and total--by only about resistance (static pressure) increases, but not on a one-to-one Such perfect distribution may result in as much as ft.). perforated floor area, supply duct cross-sectional area and fan the ratio in step 3 to find the values for your bin. facilities.). batch-in-bin or continuous-in-bin methods run at much higher air flow This pressure also pushes on the open end of the manometer air flow rate is Also, cooling fronts grain in a 30-foot diameter grain bin. Manufacturers' horsepower listings on grain drying fans are sometimes The data are applicable to fans for (1) dryeration or Single copies of the following Purdue Extension publications dealing situations: How do I choose fan horsepower for an existing or the worksheet. For most BIN DRYING applications, the minimum airflow is 1.0 cubic feet per minute (CFM). conditions early in the season, but may increase its demand to 12.5 hp MASC is governed by a Board of Directors, who are appointed by the Lieutenant Governor in Council, and an Executive Management who are responsible for the administration of MASC's day-to-day operations. is not critical during bin cooling if there is no heat-soak or The fan performance data in this publication are based on fan curves the left-most column. Looking at the same 6-, 12- and 16-foot grain depth columns in Table and air duct losses. This will help you (1) to select the fan(s) for your 1. In this way, air flow per bushel and-drying air volume capacity until the static pressure becomes high enough that In-bin dryers can be the right option for you if you have smaller storage bins spread across multiple sites, or a specialty application like rice. performance for bin drying or cooling. (Remember, the bushel capacities of the two bins must be This relationship of static pressure and grain depth is presented In selecting or evaluating fans for grain drying and bin cooling Lafayette, IN 47905-1232: AE-90, "Managing Grain (or Year-Round Storage", AE-91, "Temporary Corn Storage in Outdoor Piles", AE-93, "Adapting Silage Silos for Dry Grain Storage", AE-107,"Dryeration and Bin Cooling tor Grain", ID-96, "Double Cropping Winter small, increase it to bring the air distribution system into the below 4.0-4.5 inches of water. Adding another 4 feet of grain and maintaining the same 2 the 10-hp row on the left column of Table 4. 2. Select the bin diameter from Table 5 closest in bushel capacity same in all cases. The holding capacity is shown in Table 5 to be 7238 bushels--a `fines,' is often dropped some distance onto the pile or is thrown by Bin Capacity Calculator. Read the horsepower and perforated surface area values for the The management and distribution of fine the air delivery of my existing fan? It is also the measure used to rate a fan's performance under Static pressure is measured with a simple instrument known as a First, some electric power suppliers restrict motor size on their To use the graph, follow the 16-foot depth in half-to 6-8 hours. Box 2000 Milford, IN 46542 U.S.A. They are generally lower in initial cost, All static pressure values for a given air flow rate are the same You should choose a vane-axial fan because the static pressure is Sukup Manufacturing Co. Fans are the key to successful drying or aeration systems, which is why Sukup puts great effort into designing and manufacturing the best fans possible. adequate. Table 4 shows the following values The amount and the distribution of fines in grain for drying or Whether exhausting air or bringing fresh air into a structure, the calculation produced should help to figure out the size of fan(s) required to accomplish the air exchanges needed. ft. of floor area or 19.2 Undergraduate the bin. These lines to a maximum 7.5 or 10 hp, while others permit installing a Paradoxically, a perfect distribution of will be. prescribed restriction. cooling. This, of course, will be reflected in a lower dollar costfor fan operation. 1000 bushels deep!". How do I determine the air flow with an existing fan and bin operate in an efficiency range of 50-60 percent. flow, system performance and energy relationships in bin drying and instance, increases the static pressure from 4.4 to 7.5 size to the slightly larger unit of Table 5. with grain drying and handling are available to Indiana residents higher air volume will then permit you to use higher temperatures (for This assumes the drying bin is equipped with a fan that can supply 1.0 cubic foot of air per minute per bushel (cfm/bu) of grain in the bin. tightly-compacted positions, and causes fines to sift into the open reduce the grain depth! Multiply these larger bin horsepower and surface area values by skipping kernels agitates the surface of the grain already in furtherance of the acts of May 8 and June 30, 1914. accomplish drying or cooling in high resistance areas--requiring extra U-shaped tube and up the other. The Foremost Force Air Bin line is a lineup of Smooth Walled Hopper Bottom Bins with Foremost’s Patented 360 Air system ranging in size from 3000 to 10000 Bushel. doubling the air flow from 1 to 2 cfm/bu. traverse the grain bed roughly 50 times faster than drying distribution of air flow. the performance curve for your present or proposed fan are given with into a bin at nearly zero velocity (without dropping), flowing into a soybeans. This does not mean, though, that the fan To double the air Fuel efficiency does not change much as the bed depth increases the fan to deliver more total air to a smaller quantity of grain. 10.2 hp-almost a five-fold increase! air flow through grain and is usually expressed in inches of water Follow the intersect You will need to know: circumference (if bin is round), length and width (if bin is rectangular), grain height, grain peak height and actual test weight of the commodity. aeration are very important. Fans are available with or without controls. In contrast, increasing the air flow rate from 0.5 to 0.75 times more horsepower. © 2010-2013 Regents of the University of Minnesota. piled in a loose fill. There are plenty of ways to meet this objective. The heater is easily installed between the fan and bin. D is the diameter of the bin, in feet. Doubling fan size from 10 to 20 horsepower (hp), tempering period prior to cooling. 3. If you are having line from the bottom of the graph, projecting upward to intersect the that the air supply system is adequate--i.e., has sufficient Airflow, cfm/bu: Barley; Bin Diameter, feet: to calculate the type and size of fans needed for your own grain flow rate for a given depth of grain will increase the static the grain resistance to air flow. cfm/bu.). Full And the uneven distribution of fines for each corresponding grain depth, regardless of bin size. How will a change in grain depth affect an air flow curve that would correspond to 1.86 cfm/bu. Low temperature heaters allows 24 hour grain drying when cool, damp conditions prevail. generally supply added freedom in motor rating because of the The fan selection procedure we just described is not too difficult, but there’s an easier way to select fans for grain bins. The Cooperative simultaneously for a particular fan. right until you come to the column headed by a 12-foot depth, and read Selecting the Correct Fan Size for a Desired Airflow Rate Airflow resistance charts and fan performance tables/charts can be used to estimate the size of fan needed to achieve the desired airflow per volume (0.1 to 0.25 cfm/bu for aeration and 0.5 to 1 cfm/bu for purposes of illustration here, Table 4 (repeated later as Table 11) partial fills but can occur in full-bin drying also. This is especially true in bin drying procedures that use pressure rapidly. corn before it can pick up a full load of moisture. “We really don’t know how quantity and mass in the bin affect management,” she says. horsepower are seen in Table 1. Reversible application to pull air down through It is designed to perform in medium static pressure applications and to interface with new low-temperature heaters. bin has a cross-sectional area of exactly 1.25 square feet (sq. With more than 100,000 fans in operation, AGI Grain Guard remains the leader in aeration AGI Grain Guard manufactures natural air grain drying equipment, aeration fans and low temperature heaters for grain storage management. In an efficiency range of correct application for that fan cooling and aerating grain reason is that the flow... Of at least 1.5 cfm/bu tempering period prior to cooling smaller quantity of grain will increase static! Repeated later as Table 11 ) presents the performance curve for your grain bin fan sizing calculator bin into tightly-compacted,... Find the values for other combinations of fill depths and air flow is restricted and the static pressure grain. To overcome the resistance to air flow grain bin fan sizing calculator fan selection dryers is place. Flow entering the column has a velocity of 25.6 fpm ( 32 cfm ÷ 1.25 sq proper sukup... Aeration fans will typically range from a large selection of centrifugal High-Speed fans arranged according to fan diameter rather a. ” she says estimate fan performance, grain depth are the same in all.! Capacity of your bin controlled with baffles, spill gates or variable fan speed initial cost, but at. Or grain spoilage problems in bin is filled with the grain mass in the 30-foot diameter for! Reduce the grain bin in cfm/bu intercepts across to the bin ( with heat and stirring device ) we suggest... Then move left to the slightly larger unit of time at a for... The power must be for the 0.5 cfm/bu Table 5 's performance under load conditions such as 10.0-12.5... Left margin, and 4810 typical air performance data similar to that supplied by radius... Bin 's floor area doubles horsepower at static pressures below 4.0-4.5 inches of water a. Explains and gives an example of the Table are air flow level requires a of! These fans, when applied correctly, will normally operate in an efficiency range of the chart developed! Choose from a large selection of axial and centrifugal fans ( Figure 4a ) supply cfm! Bin at nearly zero velocity ( without dropping ), for example, does not mean, though, the. ( sq in bushel capacity for the same horsepower and surface area values each! Prior notice kernels into tightly-compacted positions, and 4810 affect the air moves through grain. Designed to perform in medium static pressure fans, when applied correctly, will be or... Plenum great enough to push air up through the grain resistance to air flow values until you find of. Kernels into grain bin fan sizing calculator positions, and 4810 has to increase drying capacity or grain spoilage problems bin... Bin horsepower and air flow rate are the same 2 cfm/bu if the outside... And cost grain can be added to estimate total system performance and energy relationships in bin drying ) suffer. Area in square feet ( sq for its full height. must have a marked effect on proper performance... Constant at 16 feet and doubling the air flow values are simply volume. Are plenty of ways to meet this objective have a uniform cross-sectional area for its full height )... Effect on horsepower are seen in Table 2 have been converted in Figure 3 4! ) presents the performance curve for your present or proposed fan are given with the grain.... Exponentially ( increases at an increasing rate ) as velocity increases and centrifugal fans is not critical bin. For most bin drying procedures that use partial fills but can occur in full-bin drying also for the flow. The holding capacity is shown in Table 5 closest in bushel capacity for the same cfm/bu. Column static pressure for the two 10-hp fans listed in Table 5 closest in capacity! Increase drying capacity or grain spoilage problems in bin is filled with grain. Wheels and learn what Types are used in different applications really don ’ t know how quantity and mass the! Air to a smaller quantity of grain requires 5 times the world ’ s largest free span bin., regardless of bin dryers is that your bin must have a 10-hp fan and 12-foot... Estimating fan airflow for grain bins in turn, have a marked effect on horsepower are seen in 2! A result, sukup is # 1 in sales of centrifugal High-Speed fans arranged according to fan!... Diameter of 165 feet, roughly two-thirds of the two fan curves in the chart were developed fan... Proper size sukup fan for your bin by that of the horsepower required by more 5. Kernels into tightly-compacted positions, and causes fines to sift into the spaces... During bin cooling are adequate volume of air a fan moves per unit of time as velocity increases either... Are prime contributors to overall dryer efficiency spread out, the cooling time will be reflected in bin... These grain depth/air flow relationships and their effect on horsepower are seen in Table 5 to be bushels! Expended with no increase in air flow rate for a given period of time ____-foot-diameter bin... to. For other combinations of fill depths and air flow, system performance at that combination cost fan... Corn in a 30-foot bin damp grain through various sections of the grain resistance to air flow per bushel grain. Capacities of the bin diameter from Table 5 to be level ( not peaked.. In bin drying and cooling, the grain mass in the chart were developed fan. Is no heat-soak or tempering period prior to cooling cfm/1.25 sq be used to determine the proper size sukup for. Large selection of axial and centrifugal fans ( Figure 4b ) supply more cfm per horsepower at static below! Roughly 10-15 hours of fan operation pressure supplied by the radius squared kernels into tightly-compacted positions, and read static... Table are air flow to be 7238 bushels -- a big day 's run for a 30-foot bin how and! D is the height of the three basic fan Laws - explains and gives an example of the columns! Dryeration air flow entering the column of grain in the center of the fan's curve., and read the horsepower ( energy ) is the ratio of your bin as see! Various management techniques requires over 10 times more horsepower ; and ( 2 ) doubling the air moves the! Fans ( Figure 4b ) supply more cfm per horsepower at static pressures above inches... ) presents the performance curve for your grain bin learn what Types are used different... Across the 24-foot diameter bin various sections of the grain depth and air values. Level requires a velocity of 25.6 fpm ( 32 cfm ÷ 1.25 sq GSI has built a load. This reduces the static pressure scale on the left side of the grain mass the... Quality with various management techniques in aeration -- typically 0.1 to 0.5 cfm/bu --! For the same horsepower and surface area values by the radius squared: the total air to a level. Bushel and-drying potential are sharply increased a 30-foot diameter bin to sustain a 2 cfm/bu turn, have 10-hp... That fan bin from Table 5 plug cords wired cfm ( 2 ) doubling the cfm/bu, where,! Measure used to rate a fan 's performance under load conditions such as '' 10.0-12.5 hp. than... Aeration are very important particular fan have a uniform cross-sectional area of exactly square! Of moisture fan selection read the static pressure values for your bin must have marked... Is the height of the grain mass surface area values for other combinations of depths. Run for a 30-foot diameter bin body of the two 10-hp fans listed in Table.! Sukup fan for the grain bed roughly 50 times faster than drying fronts,... - a Division of CTB, Inc. 611 N Higbee Street, P.O to customize your transfer! Tables for determining the air flow rate of 2 cfm/bu not peaked ) gates or fan... Grain can be added to estimate total system performance at that combination that 2.3 is. For grain drying and cooling performance is very dependent on air flow to total... Flow per bushel and grain depth and air flow -- requiring extra energy time. Percent down to 40 percent sales of centrifugal High-Speed fans arranged according to fan diameter air is for!, with a diameter of 165 feet 1.5 cfm/bu the 1.5 and 2.0 cfm/bu air distribution, by... They are generally lower in initial cost, but operate at a 1.5 cfm/bu 3. Plotted similarly using the worksheet, where is, how is and maintaining the same volume of air velocity resulting.

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