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'''Specific Fan Power''' ('''SFP''') is a parameter that quantifies the energy-efficiency of fan air movement systems. It is a measure of the electric power that is needed to drive a fan (or collection of fans), relative to the amount of air that is circulated through the fan(s). It is not constant for a given fan, but changes with both air flow rate and fan pressure rise.
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SFP for a given fan system and operating point (combination of flow rate and pressure rise) is defined as:
 
:<math>SFP ={{\sum P} \over q_v}</math>
 
where:
* <math>{\sum P}</math> is the electrical power used by the fan (or sum of all fans in the ventilation system)  [kW]
* <math>{q_v}</math> is the gross amount of air circulated through the fan (or ventilation system)  [m<sup>3</sup>/s]
 
There are various sub-definitions of SFP for different specific applications, including SFP<sub>e</sub> (building energy performance calculations), SFP<sub>v</sub> (for performance verification tests), SFP<sub>i</sub> (individual fan), SFP<sub>AHU</sub> (air handling unit), SFP<sub>FCU</sub> (fan coil unit), and SFP<sub>BLDG</sub> (whole building). These are explained in <ref>P.G. Schild & M. Mysen: ''Recommendations on Specific Fan Power and Fan System Efficiency'', Technical Note TN65, IEA Air Infiltration & Ventilation Centre, 2009 http://www.aivc.org/Publications/Technical_reports/TN65.htm</ref> and in part in.<ref>EN 13779. ''Ventilation for non-residential buildings - Performance requirements for ventilation and room-conditioning systems''. Appendix D – Assessing the power efficiency of fans and air handling units – Calculating and checking the SPF<sub>V</sub></ref> Reference 1 also describes how account for intermittently operated fans, e.g. kitchen hoods, and part-load performance in variable air volume (VAV) systems.
 
SFP can be expressed in the following equivalent SI units:
 
:<math>[SFP] \equiv {kW \over m^3/s} \equiv {W \over l/s} \equiv {kJ \over m^3} \equiv {kPa}</math>
 
==SFP and fan system efficiency==
As you can see above, SFP can be expressed in units of pressure, since pressure is a measure of energy per m³ air. The relationship between SFP, fan pressure rise, and fan system efficiency is simply:
 
:<math>\eta_{tot} \cdot SFP = \Delta p_{tot}</math>
 
where:
* <math>\eta_{tot}</math> is the overal efficiency of the driven fan system  [-]
* <math>\Delta p_{tot}</math> is the total pressure rise across the fan  [kPa]
 
In the case of an ideal lossless fan system (i.e. <math>\eta_{tot}=1</math>) the SFP is exactly equal to the fan pressure rise (i.e. total pressure loss in the ventilation system). In reality the fan system efficiency is often in the range 0 to 60% (i.e. <math>\eta_{tot}<0.6</math>); it is lowest for small fans or inefficient operating points (e.g. throttled flow or free-flow). The efficiency is a function of the total losses in the fan system, including aerodynamic losses in the fan, friction losses in the drive (e.g. belt), losses in the electric motor, and variable speed drive power electronics. For more insight into how to maximise energy efficiency and minimize noise in fan systems, see ref.1
 
==See also==
* [[Fan (mechanical)]]
* [[Industrial fans]]
* [[Efficient energy use]]
 
==References and notes==
{{Reflist}}
 
==Bibliography and further reading==
* Bunn,R: ''Let's get specific about fan power''. London: Building Services Journal. 1 August 1999
 
==External links==
* http://www.designbuilder.co.uk/helpv1/Content/Fans.htm
 
[[Category:Fans]]
[[Category:Heating, ventilating, and air conditioning]]
[[Category:Electric motors]]
[[Category:Fluid dynamics]]

Revision as of 16:42, 25 February 2014

People tend to ignore this vital stage and just decide to go with the flow. But the knife itself, created of high-carbon steel, is also effective sufficient to slice practically anything you might want to consume in a park (in addition to cheese, baguettes, salami, an apple). Serving Fancy Cake:ThermoHauser Pastry Knife Utilised by: Marriett Velasquez, private pastry chef Purchase at: SonRidge, $30 This 12-inch knife is produced with a pointed tip, so slicing big cakes is uncomplicated and clean. We all get started off with wedding gifts, Mom's hand-me-downs, and/or an cheap set.

It is thought that wood handled knives absorb microorganisms and are not as sanitary as knives with handles made of other materials. It is argued that handles made with molded plastics turn into brittle more than time, causing them to break and that they can grow to be slippery if hands are wet, making them harder to handle. Stainless Steel - Metal handled knives final longer and add weight to the knife.

Because America's Test Kitchen and Consumer Reports both rated the Wüsthof Classic set very, I decided I necessary to test this one further. Wüsthof sent me the 8-piece set and I applied the knives to make quite a few meals more than the course of a couple of days. Out of the box, the knives have beensharp and produced effortless function of cutting up herbs, nuts, meat and other components for a wide variety of meals. They make knives for just about each possible have to have.

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