Session 11 Sizing wind water pumping systems

TOTAL TIME: 2 Hours

OBJECTIVES: To learn how to size wind systems and pumps using as few formulas and engineering information as possible.

MATERIALS: Blackboard or equivalent

PROCEDURES:

Step 1: 20 minutes

Discuss the "Aermotor Pumping Capacity" chart, using examples.

Step 2: 10 minutes

Have a volunteer or local participant do a sample problem.

Step 3: 10 minutes

Discuss ''Recommended Size, Standard Steel Pipe" chart, using examples.

Step 4: 10 minutes

Have a volunteer or local participant do a sample sizing problem.

Step 5: 10 minutes

Have a volunteer or local participant do a sample combined sizing problem using what they have learned so far.

Trainer Note

Everyone can do the sample problems along with the volunteers.

Step 6: 10 minutes

Discuss any difficulties in using the charts.

Step 7: 45 minutes

Distribute some material regarding a hypothetical windsite which has typical wind conditions for the area. Have participants determine the size of the system to be built.

Trainer Note

Use data gathered in earlier sessions if possible, or data for the site where the windmill is to be installed.

RESOURCES: Copies of Attachments 7-A, 11-A, and 11-B

Attachment 11-A
Sizing Wind Water Pumping Systems

AERMOTOR PUMPING CAPACITY

Diameter of Cylinder (inches)	Gallons pumped per hour in a 15-mile per hour wind	Total height that the water is lifted (in feet)
		WINDMILL SIZE
		8 Foot	12 Foot	16 Foot
1.75	150	185	420	1000
2.00	190	140	320	750
2.50	325	94	210	490
3.00	470	68	180	425
4.00	830	39	86	200
5.00	1300	25	55	130
6.00	1875	17	38	85
8.00	3300	Too Big	22	50

NOTE: Pumping ability of the mill decreases about 3% for every additional 1000 feet (300 Meters) above sea level

PUMPING CAPACITY OF SIX-FOOT AERMOTORS

Diameter of Cylinder (inches)	Gallons pumped per hour in a 15-mile per hour wind	Total height that the water is lifted (in feet)
1.75	105	130
2.00	130	95
2.50	225	65
3.00	320	47
4.00	570	27
5.00	900	17
6.00	Too Big	Too Big
8.00	Too Big	Too Big

Attachment 11-B
Sizing Wind Water Pumping Systems

RECOMMENDED SIZES - STANDARD STEEL PIPE

Flow/Gallons per minute	Flow/Gallons per hour	Recommended Pipe Size	Flow/Liters per minute	Flow/Liters per hour
1	60	1/2 inch	4	240
3	180	3/4 inch	11	660
5.5	330	1 inch	21	1260
10	600	1-1/4 inch	38	2280
16	960	1-1/2 inch	61	3660
32	1920	2 inch	122	7320

RECOMMENDED SIZES- PLASTIC PIPE

Flow/Gallons per minute	Flow/Gallons per hour	Recommended Pipe Size	Flow/Liters per minute	Flow/Liters per hour
1.5	90	1/2 inch	6	360
4.5	270	3/4 inch	17	1020
8	480	1 inch	30	1800
15	900	1-1/4 inch	57	3420
24	1440	1-1/2 inch	91	5460
48	2880	2 inch	182	10920

NOTE: These sizes will give fairly low flow speed, which is desirable because it keeps friction losses small. Friction loss in all cases is about 5% of the length of the pipe. This is the same as having to pump 5 feet (or meters) higher for every 100 feet (or meters) of pipe in the system.