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- Affinity_laws abstract "The affinity laws for pumps/fans are used in hydraulics and HVAC to express the relationship between variables involved in pump or fan performance (such as head, volumetric flow rate, shaft speed) and power. They apply to pumps, fans, and hydraulic turbines. In these rotary implements, the affinity laws apply both to centrifugal and axial flows.The affinity laws are useful as they allow prediction of the head discharge characteristic of a pump or fan from a known characteristic measured at a different speed or impeller diameter. The only requirement is that the two pumps or fans are dynamically similar, that is the ratios of the fluid forced are the same.Law 1. With impeller diameter (D) held constant:Law 1a. Flow is proportional to shaft speed:, Law 1b. Pressure or Head is proportional to the square of shaft speed: Law 1c. Power is proportional to the cube of shaft speed: Law 2. With shaft speed (N) held constant: Law 2a. Flow is proportional to the impeller diameter to the 3rd power: Law 2b. Pressure or Head is proportional to the square of impeller diameter: Law 2c. Power is proportional to the fifth power of impeller diameter: http://www.engineeringtoolbox.com/affinity-laws-d_408.htmlwhere is the volumetric flow rate (e.g. CFM, GPM or L/s), is the impeller diameter (e.g. in or mm), is the shaft rotational speed (e.g. rpm), is the pressure or head developed by the fan/pump (e.g. psi or Pascal), and is the shaft power (e.g. W).These laws assume that the pump/fan efficiency remains constant i.e. . When applied to pumps the laws work well for constant diameter variable speed case (Law 1) but are less accurate for constant speed variable impeller diameter case (Law 2).".
- Affinity_laws wikiPageExternalLink affinity-laws-d_408.html.
- Affinity_laws wikiPageID "2889394".
- Affinity_laws wikiPageRevisionID "603988012".
- Affinity_laws hasPhotoCollection Affinity_laws.
- Affinity_laws subject Category:Fans.
- Affinity_laws subject Category:Hydraulics.
- Affinity_laws subject Category:Pumps.
- Affinity_laws subject Category:Turbines.
- Affinity_laws type Artifact100021939.
- Affinity_laws type Device103183080.
- Affinity_laws type Engine103287733.
- Affinity_laws type HeatEngine103507963.
- Affinity_laws type Instrumentality103575240.
- Affinity_laws type Internal-combustionEngine103579982.
- Affinity_laws type Machine103699975.
- Affinity_laws type MechanicalDevice103736970.
- Affinity_laws type Mechanism103738472.
- Affinity_laws type Motor103789946.
- Affinity_laws type Object100002684.
- Affinity_laws type PhysicalEntity100001930.
- Affinity_laws type Pump104021798.
- Affinity_laws type Pumps.
- Affinity_laws type RotaryEngine104110654.
- Affinity_laws type Turbine104498523.
- Affinity_laws type Turbines.
- Affinity_laws type Whole100003553.
- Affinity_laws comment "The affinity laws for pumps/fans are used in hydraulics and HVAC to express the relationship between variables involved in pump or fan performance (such as head, volumetric flow rate, shaft speed) and power. They apply to pumps, fans, and hydraulic turbines.".
- Affinity_laws label "Affinity laws".
- Affinity_laws label "Leyes de afinidad".
- Affinity_laws sameAs Leyes_de_afinidad.
- Affinity_laws sameAs m.089dcj.
- Affinity_laws sameAs Q632736.
- Affinity_laws sameAs Q632736.
- Affinity_laws sameAs Affinity_laws.
- Affinity_laws wasDerivedFrom Affinity_laws?oldid=603988012.
- Affinity_laws isPrimaryTopicOf Affinity_laws.