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| | | Technische Informationen / Technical Information | | |
| | | rosenberg | | |
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| | | Strömungstechnische Gesetze für Ventilatoren (Proportionalitätsgesetze) Drehzahländerung bei gleichbleibender Ventilatorgröße und gleichbleibender Dichte: | | |
| | | Flow laws | | |
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| | | Speed variation at constant fan size and constant density: | | |
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| | | Vi__jti_ The volume flow changes pro- Vi _ ni V2 _ n2 portionately to the speed V2 _ n2 | | |
| | | Der Volumenstrom ändert sich proportional der Drehzahl | | |
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| | | Die Drücke (statisch, dynamisch, Gesamt-) ändern sich proportional dem Quadrat der Drehzahl Der Leistungsbedarf ändert sich proportional der dritten Potenz der Drehzahl | | All pressures (static, dynamic and total) change proportionately to the square of the speed The power requirement changes proportionately to the third power of the speed | | |
| | | | | | | | | | | | Pstl | | k | 2 / | | | | Pst2 | | | \ | | | | Pi | | fni | 3 / | | | | P2 | | | \ | | | | | | | | | | | |
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| | | Vi lV2| 1V2 | | |
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| | | Psti Pst2 P2 | | |
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| | | Hi | | |
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| | | Änderung der Dichte bei gleichbleibender Drehzahl (bzw. Änderung der Temperatur bei gleichem Fördermedium): | | Changes in the density at constant speed (or change of the Kelvin temperature at a constant flow medium: | | |
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| | | | | | | | | | | | Der Volumenstrom bleibt gleich | V | _ const. | | | | Die Drücke ändern sich proportio- | Psti | _ Si | | | | | nal der Dichte | Pst 2 | | Ti | | | | Der Leistungsbedarf ändert sich | Pi | _ Si | | | | | proportional der Dichte | P2 | | Ti | | | | Bei Änderung des Raddurchmessers | von | geome- | | | | | | | | | | | |
| | | The volume flow is not affected All pressures (static, dynamic and total) change proportionately to the square of the speed The power requirement changes proportionately to the density | | V | | |
| | | constant | | |
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| | | | | | | | | | | Psti | _ ?i _ | T2 | | | | Pst 2 | | Ti | | | | Pi | _ 5i _ | T2 | | | | P2 | | Ti | | | | | | | | | | |
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| | | In the case of changes in the wheel diameter of geometrically similar wheels at constant speed: | | |
| | | trisch ähnlichen Rädern bei gleicher Drehzahl: | | |
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| | | | | | | | | | Vi _ | (Dil | | | | V2 | ID2J | | | | Psti _ | (Di) | | | | Pst2 | \D2, | | | | Pi _ | (Di) | | | | P2 | D2 | | | | | | | | | |
| | | | | | | | | | Vi _ | 'Di | | | | V2 | | | | | Psti _ | fDi| | | | | Pst2 | iD2) | | | | Pi _ | '.Di' | | | | P2 | ,D2, | | | | | | | | | |
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| | | The volume flow changes proportionately to the third power of the wheel diameter All pressures (static, dynamic and total) change proportionately to the square of the square of the wheel diameter The power requirement changes proportionately to the fifth power of the wheel diameter | | |
| | | Der Volumenstrom ändert sich proportional der dritten Potenz des Raddurchmessers Die Drücke (statisch, dynamisch, Gesamt-) ändern sich proportional dem Quadrat des Raddurchmessers Der Leistungsbedarf ändert sich proportional der fünften Potenz des Raddurchmessers. | | |
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