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# 中央空调节能改造后的系统节电效果

### 发布日期：2015-04-02 16:33 来源： 点击：

中央空调系统中的风机、水泵类负载属于平方转矩负载设备，即转矩T与转速n的平方成正比T∝n2，而电机轴的输出功率 W∝T*n∝n3,即电机轴上的输出功率与转速的三次方式成正比。由此可见，当电机的转速稍有下降时，电机功率损耗就会大幅度地下降，耗电量也就大为减少，而中央空调节能改造技术的节电系统能有效降低风机、水泵的转速,从面达到节电目的。

Central air conditioning system of fan and water pump loads belong to square torque load device, namely T torque and rotational speed is directly proportional to the square of the n T ∝ n2, and the output of the motor shaft power W ∝ T * n ∝ n3, on the shaft of the motor output power is proportional to the speed of three ways. Thus, when the speed of the motor are down a bit, the motor power loss will drop dramatically, power consumption is greatly reduced, and the central air conditioning energy conservation transformation technology of energy-saving system can effectively reduce the speed of the fan, water pump, power saving from the surface to achieve.

So, by reducing the speed of the fan and water pump method can save much electricity? The central air-conditioning energy saving reconstruction experts Kang Can through a power saving rate index to quantitatively describe the effect of saving electricity.

Due to rotational speed n is proportional to the frequency f, i.e., n = 60 f) (1 - s/P, if the operation frequency of the motor from 50 hz dropped to 40 hz, the actual droop for 80% of the rated speed of the motor, namely:

n实际=0.8n额定。

N actual rated = 0.8 n.

Due to the motor rated power is: W h rated = KNS.

Therefore, when the motor running in 40 hz actual power for: W = actual Kn3 actual = K (0.8 N) rated 3 = 0.8 Kn3 rated rated power saving ratio = = 0.512 W (motor rated power - the actual power)/motor rated power = rated rated - W the actual) (W/W = h rated 0.512 W) (W/W = 48.8% rating.

Calculated by the above can be seen, if the motor running of fan and water pump in 40 hz, in theory, the actual consumption of motor power only half of the rated power, at this point, the central air-conditioning energy saving after transforming theory of power saving rate of 48.8%, power saving effect is significant, economic benefit is very considerable.

### 相关标签：济南中央空调改造

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