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2. Specific fan power - Wikipedia

   en.wikipedia.org/wiki/Specific_fan_power

   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).

3. Bypass ratio - Wikipedia

   en.wikipedia.org/wiki/Bypass_ratio

   The bypass ratio (BPR) of a turbofan engine is the ratio between the mass flow rate of the bypass stream to the mass flow rate entering the core. [1] A 10:1 bypass ratio, for example, means that 10 kg of air passes through the bypass duct for every 1 kg of air passing through the core.

4. Power-to-weight ratio - Wikipedia

   en.wikipedia.org/wiki/Power-to-weight_ratio

   Power-to-weight ratio (PWR, also called specific power, or power-to-mass ratio) is a calculation commonly applied to engines and mobile power sources to enable the comparison of one unit or design to another. Power-to-weight ratio is a measurement of actual performance of any engine or power source.

5. Passive ventilation - Wikipedia

   en.wikipedia.org/wiki/Passive_ventilation

   SFP is specific fan power in Pa, J/m 3, or W/(m 3 /s) Under typical comfort ventilation conditions with a heat recovery efficiency of 80% and a SFP of 2000 J/m 3 we get:

6. Affinity laws - Wikipedia

   en.wikipedia.org/wiki/Affinity_laws

   ˙ is the shaft power (units of power, or energy/time). [3] These laws assume that the pump/fan efficiency remains constant i.e. =, which is rarely exactly true, but can be a good approximation when used over appropriate frequency or diameter ranges. The exact relationship between speed, diameter, and efficiency depends on the particulars of ...

7. Fan (machine) - Wikipedia

   en.wikipedia.org/wiki/Fan_(machine)

   A household electric fan A large cylindrical fan. A fan is a powered machine that creates airflow. A fan consists of rotating vanes or blades, generally made of wood, plastic, or metal, which act on the air. The rotating assembly of blades and hub is known as an impeller, rotor, or runner. Usually, it is contained within some form of housing ...

8. AOL Mail

   mail.aol.com/d?reason=invalid_cred

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

9. SFP - Wikipedia

   en.wikipedia.org/wiki/Sfp

   Specific fan power, a function of the volume flow of the fan and the electrical power input; Spent fuel pool, a storage pool for spent nuclear reactor fuel; System File Protection, a technology in Microsoft Windows to prevent "DLL hell"