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Engineering department is energy-saving knowledge: of entangled of intermediar

From;  Author:Stand originally
One, adjust the section report principle of water pump rotate speed

Use those who communicate frequency conversion technology to control water pump to move, it is current system of central air conditioning is energy-saving one of transformed effective by way of, draw laying a plan gave valve control adjustment and the water pump power that frequency control controls two kinds of state are used up -- flow concern curve.

The different power that the graph showed to transducer control and valve control water pump use up on, from on pursue total we can see in water pump discharge is clearly rated 60% when, transducer control and valve control photograph comparing, power dropped 60% ; It is far insufficient that so water pump relies on valve to control merely, have transducer pilot energy-saving transforming is very necessary.

To water pump, discharge Q and rotate speed N become direct ratio, of lift H and rotate speed N just become direct ratio 2 times, and the cube of axial power and P and rotate speed N becomes direct ratio, next watches listed the relation between them changes:

N% of water pump rotate speed

Report of section of P% of power of axis of H% of lift of water pump of running frequency F(Hz) is led %

100 50 100 0

90 45 81 72.9

27.1

80 40 64 51.2 48.8

70 35 49 34.3 65.7

60 30 36 21.6 78.4

From on the method that frequency control uses it is thus clear that in the watch will reduce water pump discharge to undertake energy-saving transformed economic benefits is very remarkable, need discharge to decrease when place, when water pump rotate speed is reduced, the place of its electromotor needs power to drop by the cube of rotate speed;

Drop when water pump rotate speed of rated rotate speed 10% namely when F=45Hz, its are dynamoelectric crankshaft power dropped 27.1% , rate of report of water pump section is 27.1% ;

Drop when water pump rotate speed of rated rotate speed 20% namely when F=40Hz, its are dynamoelectric crankshaft power dropped 48.8% , rate of report of water pump section is 48.8% ;

Drop when water pump rotate speed of rated rotate speed 30% namely when F=35Hz, its are dynamoelectric crankshaft power dropped 65.7% , rate of report of water pump section is 65.7% ;

Drop when water pump rotate speed of rated rotate speed 60% namely when F=30Hz, its are dynamoelectric crankshaft power dropped 78.4% , rate of report of water pump section is 78.4% ;

2, refrigerant the computation that leads with report of division of cooling water pump:

Computation is formulary: Refrigerant lead × of 50Hz)3] of ÷ of =[1-(transducer running frequency with report of division of cooling water pump 100%

For example: Water pump rotate speed is reduced 30% , namely 35Hz of = of transducer running frequency
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