Storage design for corn yp

YAKINDRA P. TIMILSENA ID No. 111332 STORAGE DESIGN FOR CORN

DESIGN OF AERATION OF BULK STORAGE ,[object Object],[object Object],[object Object],[object Object]

Step 1 : Select design moisture ,[object Object],[object Object]

Step 2 : Calculate the generated heat ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Deterioration equation : C 6 H 12 O 6 + 6O 2 6H 2 O + 6CO 2 + Heat (2800 kJ/mol C 6 H 12 O 6 ) (180) (192) (108) (264)

Table1 Rate of deterioration constants for some common cereal grains. ( To compute CO 2 generation ) Grain A B 10-13.2% 13.3-17% 10-13.2% 13.3-17% Corn, yellow dent 0.17 0.27 2.00 3.33 Sorghum 0.125 0.32 1.65 4.19 Rough rice 0.21 0.44 3.04 6.08 10-14% 14-17% 10-14% 14-17% Wheat , soft 0.090 0.36 1.35 5.14

Step 3 : Select a design day ,[object Object],[object Object]

[object Object],Fig.5 Relative humidity and temperature data for Jakarta, Indonesia, latitude 6 ° 11’ S. The curves represent monthly averages.

Step 4 : Calculate equilibrium relative humidity ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],RH = 0.6625 or 66.25% 0.1494)] * 16.958 EXP( * 30.205) (30 * 1.987 620.56 EXP[ RH    

Table2 Chung-Pfost equilibrium constants for grain. Grain Constant A B C E F Beans, Edible 1334.93 14.964 120.098 .480920 .066826 Peanut, Kernel 506.65 29.243 33.892 .212966 .034196 Peanut, Pod 1037.19 37.093 12.354 .183212 .026383 Rice, Rough 1181.57 21.733 35.703 .325535 .046015 Corn, Yellow dent 620.56 16.958 30.205 .379212 .058970 Soybean 275.11 14.967 24.576 .375314 .066816 Wheat, Durum 1831.40 18.077 112.350 .415593 .055318 Wheat, Hard 1052.01 17.609 50.998 .395155 .056788 Wheat, Soft 1442.54 23.607 35.662 .308163 .042360

Step 5 : Determine hours of operation per day ,[object Object],Hours of operation = 17.75 – 11.25 = 6.5 hours per day RH = 66.25%

Step 6 : Calculate kilogram of air needed per day ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Density of air = 1.177 kg/m 3

Step 7 : Determine air volume and pressure ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],From step 6

Table3 Cubic meters occupied by a tonne of grain Grain Cubic meters/Tonne Rough rice 1.72 Maize 1.39 Wheat 1.30 Oats 2.43 Peanuts (Virginia) 4.27 Sorghum 1.37 Barley 1.55

Step 8 : Select fan = 59.30 m 3 /min = 1.98 m/min 6*5 P = 53.7 V 1.32 Where P = Pascals of pressure drop in a meter V = Apparent velocity, in m/min Static pressure of rough rice : From step 7

[object Object],[object Object],[object Object],[object Object],Height of bin = 4 m Air power = 0.01153 kW * air deliver (m 3 /min) * head of air 60 sec/min = 0.01153 * 59.30 * 45.83 60 = 0.522 kW

Step 8 : Select fan ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],From step 7 Step 8 : Select fan

[object Object],[object Object],HP

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Specifications of possible fan ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Fan A is preferable because of the larger wheel, slower speed, lower power and lower cost.

Step 9 : Design the air distribution system ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Step 10 : Design the power and controls ,[object Object]

Storage design for corn yp

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Storage design for corn yp