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Static efficiency

Efficiency. Fan efficiency describes a fan s abiUty to do work and is calculated as total efficiency (Eff) using total pressure (TP) or static efficiency (Eff) using static pressure (SP). Total efficiencies for axial fans range from 55 to 80% static efficiencies range from about 40 to 65%. When pressure is in pascals and flow rate in irf /s,... [Pg.112]

MECHANICAL EQUIPMENT Fans Number Type or Model Manufacturer Diameter, ft. Number of Blades Fan Speed, RPM Tip Speed, FPM BHP per fan, driver output Blade Material Hub Material Total Static Pressure, in. HjO Velocity Pressure, in. H2O Air Delivery per Fan, ACFM Fan Static Efficiency ... [Pg.420]

These low-cost fans are of simple construction and have static efficiencies up to 80%. [Pg.745]

They are normally fitted with 10-12 blades, the blade tips inclined away from the angle of rotation. They have the advantage of being very efficient, with fan static efficiencies in excess of 80% for airfoil blades. This type of fan has a nonoverloading characteristic curve. [Pg.745]

Static efficiency The ratio of fan static pressure to fan total pressure. [Pg.1478]

This relation includes a 50% static efficiency of the fan and gear losses, assuming a gear drive [19]. If belt driven the difference will not be great. [Pg.393]

Static efficiencies run from 10-50% depending on the fan and its installation. With a well-designed inlet ring and discharge diffuser, the efficiencies may be 50-60%. [Pg.551]

Q = flow volume through fan, cfm Pj = static pressure, in. water P( = total pressure, in. water = static efficiency, fraction T)( = total efficiency, fraction... [Pg.562]

Tj = air or gas temperature at outlet, °R P, = fan outlet velocity pressure, in. water abs or other absolute units n = polytropic coefficient Cj = fan static efficiency, fraction... [Pg.562]

In this type, air enters the impeller axially and is discharged radially into a volute casing. The airflow therefore changes direction through 90°, which can make this type of fan difficult to use within a ducted system. Two blade types are used backward curved providing high-pressure at low volume flow and forward curved providing medium-pressure and volume flow. Typical static efficiencies are 70-75 per cent and 80-85 per cent, respectively. [Pg.423]

This is really a simple form of axial fan but with its impeller mounted in a ring or diaphragm which permits it to discharge air with both axial and radial components. Duties covered are high volume and low pressure. Static efficiency is normally under 40 per cent. [Pg.423]

A fan in which the air path through the impeller is intermediate between the axial and centrifugal types giving the benefit of increased pressures but capable of being con-stmcted to provide either axial or radial discharge. Static efficiency is typically 70-75 per cent. [Pg.424]

This type normally has a long cylindrical impeller having a relatively large number of shallow forward-curved blades. Due to the shape of the casing surrounding this impeller, air enters all along one side of the cylindrical surface of the impeller and leaves on another side. Static efficiency is typically 40-50 per cent. [Pg.424]

More generally, any public policy that affects use of pharmaceutical products in the short run should affect innovation in the longer run. As discussed above, countries differ in their relative emphasis on cost containment by the public sector versus reliance on market forces to achieve socially desirable outcomes. A method for achieving cost containment and static efficiency in some countries has been public evaluation of the costs and benefits of new technologies. [Pg.15]

Static efficiency Distribution of rents Competitiveness Legal considerations Dynamic incentives Transaction costs Auctions Auctions in theory, free allocation in practice Depends upon use of auction revenues Auctions Auctions Uncertain, favours auctions in medium term... [Pg.144]

Total Static Pressure, in. H2O Velocity Pressure, in. H2O Air Delivery per Fan, ACFM Fan Static Efficiency ... [Pg.470]

The following factors affect centriffigal-fan performance brake horsepower, fan capacity, fan rating, outlet velocity, static efficiency, static pressure, tip speed, mechanical efficiency, total pressure, velocity pressure, natural frequency and suction conditions. Some of these factors are used in the mathematical relationships that are referred to as Fan Laws. [Pg.265]

Static efficiency (SE) is not the true mechanical efficiency, but it is convenient to use in comparing fans. This is calculated by the following equation ... [Pg.266]

The curve representing the system resistance is the same in both cases, since the system has not changed. The fan will operate at the same relative point of rating and will move the increased volume through the system. The mechanical and static efficiencies are unchanged. [Pg.269]

Figure 9-12 Compressor Static efficiency vs. Specific Speed and Corrected Mass Flow.31... Figure 9-12 Compressor Static efficiency vs. Specific Speed and Corrected Mass Flow.31...
See other pages where Static efficiency is mentioned: [Pg.343]    [Pg.550]    [Pg.551]    [Pg.551]    [Pg.559]    [Pg.562]    [Pg.576]    [Pg.423]    [Pg.13]    [Pg.14]    [Pg.46]    [Pg.284]    [Pg.447]    [Pg.177]    [Pg.284]    [Pg.284]    [Pg.284]    [Pg.224]    [Pg.24]    [Pg.266]    [Pg.266]    [Pg.334]    [Pg.334]    [Pg.305]    [Pg.321]   
See also in sourсe #XX -- [ Pg.1479 ]

See also in sourсe #XX -- [ Pg.13 , Pg.46 ]



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