MICROFICHE REFERENCE LIBFUUW - Cd3wd.com
MICROFICHE REFERENCE LIBFUUW - Cd3wd.com MICROFICHE REFERENCE LIBFUUW - Cd3wd.com
Multiplying all these efficiencies together produces the overallefficiency (OAE) of the water lifting operation, i.e., the percentageof energy put into the prime mover which will actually be added to thewater.That is,OAF = Effx EffPumpx Effmover transmission' (2.16)In systems using electric power, the OAF is often referred to as wire-to-waterefficiency.2.2.5 Performance CurvesUsing various combinations of the parameters defined above, theperformance of any water lifting device can be described graphically inperformance or characteristic curves. Figure 2.1 showed how an H-Q curveis used to describe a pumping system, i.e., what total head must beproduced to deliver a given discharge through that system. Likewise, anH-Q curve can be used to show at what head(s) a water lifter will delivera specified discharge. Specific curves are given in Chapters 3 and 4 ofvarious types of devices; however, the simple bucket can again serve as agood example. As the height (i.e., head) increases through which aperson must lift a bucket of water, it can be expected that he will beable to deliver less buckets per unit time. So, this water lifter's H-Qcurve may look something like Figure 2.3. Similarly, the variation ofBHP and Eff with Q can be plotted. These performance curves are notlimitedto modern pumps.These four characteristic parameters are often plotted together fora specific device using Q as the common absicissa. A fourth curve,
26r20 liter BucketIO literBucket46 IO 12 14 I6 I8 20Q (Buckets / min )I1Figure 2.3 Example H-Q curve(not based on actualdata)
- Page 1: MICROFICHEREFERENCELIBFUUWA project
- Page 4 and 5: TABLE OF CONTENTS:.LIST OF FIGURES
- Page 6 and 7: LIST OF FIGURES (CONT)Figure3.163.1
- Page 8 and 9: LIST OF TABLESTable2.12.2a2.2b3.13.
- Page 10 and 11: 2find both new water lifting device
- Page 12 and 13: 4During the 3rd centuryB.C., Archim
- Page 14 and 15: GIn 1698, Thomas Savery obtained a
- Page 16 and 17: 9the United States was starting set
- Page 18 and 19: 11engines, motors, transmissions, e
- Page 20 and 21: Chapter 2Water LiftingPrinciples2.1
- Page 22 and 23: 15Table 2.2a Classification of wate
- Page 24 and 25: 2.2.1 Discharge or Capacity (Q)Disc
- Page 26 and 27: (h) Drawdown (D) is the vertical di
- Page 28 and 29: 21Tota I DynamicHeadI Total Static
- Page 30 and 31: 23Vapor Pressure (P,)Suction Fricti
- Page 34 and 35: 27NPSHR-Q, is also usually included
- Page 36 and 37: 3.2.1.1 Bucket/BagUtilizing nothing
- Page 38 and 39: handmade construction can be easily
- Page 40: animal is returning to the top, the
- Page 43 and 44: 363.2.1-S Counterpoise LiftThe coun
- Page 45 and 46: 38to return the lever. Combinations
- Page 47 and 48: 40Table 3.1Shadouf performanceLift
- Page 49 and 50: (b)Figure 3.5 Scoop (a) used as sho
- Page 51 and 52: ‘PIVOT-r- ----hFigure 3.6 Wzcer b
- Page 53 and 54: 46water. The capacity of this devic
- Page 55 and 56: - =7?=PIVOTCOUNTER WEIGHT\FLAP- VAL
- Page 57 and 58: 50(a)ROLLER 7- HAND RAIL/SIDE - BY-
- Page 59 and 60: 52flow in through a check-valve (e.
- Page 61 and 62: 54exhaust valves for the steam (or
- Page 63 and 64: 56Another significant difference be
- Page 65 and 66: 58shaft), two other forms of these
- Page 67 and 68: 60Among the simplest designs for a
- Page 69 and 70: 62/HANDLEBARDISCHARGEHOSEfFOOTRE$TD
- Page 71 and 72: HANDLE/CONNECTINGARMDISCHARGEFLAP V
- Page 73 and 74: 663.3.1 WheelAfter many of the earl
- Page 75 and 76: 68Table 3.2 Manually-operated paddl
- Page 77 and 78: 70engine (2-3 hp) as the prime move
- Page 79 and 80: 72Table 3.3 records some of the per
- Page 81 and 82: 74Several names which are also appl
26r20 liter BucketIO literBucket46 IO 12 14 I6 I8 20Q (Buckets / min )I1Figure 2.3 Example H-Q curve(not based on actualdata)
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