Page 232 - Applied Photovoltaics

The two broad categories of pumps used for photovoltaic-powered systems,
centrifugal and volumetric (displacement), are described below. A rough guide to
ranges of applications is given in Fig. 11.3.
Fig. 11.4 shows a ‘tree’ of pump categories. A brief discussion of pumping
technologies and a market survey of available products has been produced by von
Aichberger (2003).

dynamic
centrifugal
axial-flow
single-stage
closed or open impeller
fixed or variable pitch
multi-stage
closed or open impeller
fixed or variable pitch
mixed flow, radial flow
single suction
self- or non-priming
open, semi-open or closed impeller
single- or multi-stage
open, semi-open or closed impeller
peripheral
single- or multi-stage
self- or non-priming
special effect
jet (eductor)
gas lift
hydraulic ram
electromagnetic
displacement (volumetric)
reciprocating (jack)
piston, plunger
steam—double-acting
simplex or duplex

power
single- or double-acting
simplex or duplex
diaphragm
simplex or duplex
fluid or mechanically operated
rotary
single rotor
vane or piston or flexible member or screw or peristaltic
multiple rotor
gear or lobe or circumferential piston or screw

Figure 11.4. Pump category tree (after Krutzch & Cooper, 2001).

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