As an important member of household appliances, air conditioners will always bring us comfort in summer, but many times we will have a doubt: why the cooling effect of air conditioners is average, but the power consumption is so high? This article will take you quickly to understand.

Abstract: As an important member of household appliances, air conditioners will always bring us comfort in summer, but many times we will have a doubt: why the cooling effect of air conditioners is average, but the power consumption is so high? This article will take you quickly to understand.

1. The impact of the level of energy consumption on the use of electrical appliances

When we buy an air conditioner, the best way to judge the cooling capacity of an air conditioner is to look at its output power.

In an ideal state, the output power of 1 horse is about 2400 watts, and the energy efficiency ratio of the air conditioner = the output power of the air conditioner / the input power of the air conditioner, so according to the formula we can know that the higher the energy efficiency ratio, the higher the power consumption when the cooling effect is the same. The lower the amount. Figure 1 shows the three-level energy efficiency standard set by the new energy consumption national standard for air conditioners.

New energy efficiency standard (12021.3-2010)

type

Rated cooling capacity

(CC)W

Level 1

level 2

Level 3

Split

CC≤4500

3.6

3.4

3.2

4500<CC≤7100

3.5

3.3

3.1

7100<CC≤14000

3.4

3.2

3

Figure 1 New energy efficiency standards

Therefore, if you find that the cooling effect of your own air conditioner is average, but the power consumption is large, it is likely that the energy efficiency level of the air conditioner is low, resulting in excessive energy consumption.

2. The significance of more advanced energy consumption levels

Why is the cooling effect of the air conditioner average, but the power consumption is so high?

Figure 2 Energy efficiency label

With the rapid economic growth of various countries, the demand for and ownership of household appliances has increased by leaps and bounds, and such growth has brought huge energy consumption and caused serious pollution to the environment. As shown in Figure 2, in order to reduce the environmental pollution of these home appliances, countries all over the world have improved the energy efficiency of energy-using products by formulating and implementing energy efficiency standards and promoting energy efficiency labeling systems, promoting energy-saving technology advancement, and reducing harmful emissions. And protect the environment.

3. Power meter’s energy consumption test plan for household appliances

More and more home appliances use frequency conversion technology, which not only saves energy but also causes distortion of the product’s waveform signal. Moreover, the application of frequency conversion leads to frequent changes in the working state during the operation of household appliances, resulting in large-scale changes in the working current, which can drop from tens of amperes to several milliamperes. So, what kind of instrument can meet the test and measurement requirements for inverter home appliances such as air conditioners?

Why is the cooling effect of the air conditioner average, but the power consumption is so high?

Figure 3 Test chart of household and office electrical appliances

Figure 3 shows the test chart of home and office appliances. Here we take the air conditioner as an example to share with you what are the difficulties in the test of down-converter appliances?

Difficulties in testing

1. While saving energy consumption, frequency conversion household appliances also make the waveform signal of the product prone to distortion. These distorted waveforms are all non-sinusoidal signals, such as pulse waves, triangle waves, rectangular waves, trapezoidal waves and pulse waves, which are rich in high-frequency harmonic components. Ordinary power meters are unable to accurately measure high frequency components due to the limitation of sampling rate and bandwidth, so there is a huge gap between the measured value and the true value.

2. In the integration mode, the general power measurement instrument only allows power measurement in the same range, which cannot satisfy the correct measurement of the power of variable frequency home appliances.

solution:

Why is the cooling effect of the air conditioner average, but the power consumption is so high?

Figure 4 The relationship between the signal of the frequency conversion home appliance and the bandwidth of the power meter

As shown in Figure 4, we can see the low-bandwidth power meter, the high-frequency components in the signal are filtered out by the analog front-end circuit, resulting in energy loss. The 300KHz bandwidth of the ZHIYUAN Electronic power meter fully meets the power consumption measurement of new technology products such as variable frequency home appliances.

Why is the cooling effect of the air conditioner average, but the power consumption is so high?

Figure 5 Comparison of automatic range switching and fixed range mode

The PA300 series digital power meter adopts a brand-new design architecture and has been optimized for low power consumption measurement. It has higher power factor accuracy and is very suitable for standby power consumption measurement. And up to the 50th harmonic analysis function for you to analyze the quality of the waveform more accurately. As shown in Figure 5, the function of this series of power meters that can automatically switch the range in the integration mode provides a guarantee for the accurate measurement of the power of variable frequency home appliances.

Summarize:

The PA300 series digital power meter has the highest sampling rate of 500KS/s, 300KHz bandwidth, and can automatically switch the range in the integration mode for variable frequency home appliances, and supports wide current input and other features to provide reliable power for the test of working power consumption Measurement solutions.

The Links:   LQ064V1DS11 2MBI1200U4G-170