1, how to look at the air conditioning energy efficiency rating
The air conditioning performance level, ie the energy efficiency ratio of the air conditioner, is the ratio of the rated cooling capacity to the rated power consumption. Our so-called air conditioning refrigeration energy efficiency ratio (EER) is the name for energy efficiency, that is, the comparison between rated power consumption and rated cooling capacity. In addition, the heating and cooling type household air conditioner also includes the concept of heating energy efficiency ratio (COP), that is, the ratio of rated heating capacity to rated power.
How is the air conditioning energy efficiency ratio divided?
Compared with the air conditioners currently sold in China, the air conditioners are marked with the “China Energy Efficiency Label” color label, which is a blue and white background color logo. The new energy efficiency label is divided into 1, 2, and 3 levels. The old version of the energy efficiency label Divided into 1 - 5 grades.
Level 1 means that the product has reached the international advanced level, the most energy-saving, that is, the lowest energy consumption; level 2 means that the product will be more energy-saving; level 3 means that the energy efficiency of the product is the average level of the Chinese market.
And this timeGreeThe reason for reporting Oaks is that this energy efficiency is not up to standard. Gree said that Oaks' own rated secondary energy efficiency product of 3.59 is actually only 2.68, which is far lower than the national mandatory requirement of 3.2, and the deviation allowed by the national standard is 5 %, Oaks' actual energy efficiency deviation has reached 25%.
Seeking truth from the truth: If Oaks really has a virtual parameter, it is not only a serious deception to the consumer, after all, I think that the second-class energy-efficient air conditioner is not a high-energy product that does not meet the standard, but also for air-conditioning. The credibility of the energy efficiency certification has been severely hit (Aux has been insisting that it has passed the national test), and the high-energy air-conditioning is installed as an energy-saving air conditioner at a low price. It is also an impact on the manufacturers selling energy-saving air conditioners at a positive price. The currency, the market is corrupt.
At a deeper level, the state has always had energy subsidies, and there are financial support for the manufacture of energy-saving products. If Oaks is really shoddy, there may be suspicions of fraudulent policy subsidies. Qizheng hopes that the relevant departments can thoroughly check these products and give an explanation to consumers and manufacturers who make products seriously.
How do you think about the energy efficiency ratio of air conditioners?
The level of the label is not enough, because after all, the grade is only a range. For example, the energy efficiency ratio of the split air conditioner below 4500 w is greater than 3.6. even if the energy efficiency ratio is greater than 3.6. this is also the first class, 5.7. at the same price, we must choose 5.7. in fact, the formula for calculating the energy efficiency ratio of air conditioning is very simple: energy efficiency ratio = refrigerating capacity / input power, refrigerating capacity refers to the ability of air conditioning to adjust room temperature, and input power refers to refrigeration power. That is, the power consumption of air conditioning and refrigeration.
In fact, the logo is written, except for the above line, the following figure as an example, a refrigerated capacity of 2350 watts of air conditioning, refrigeration power 712 watts, energy efficiency ratio: 2350 / 712 = 3.30, < 3.4,="" a="" little="" low,="" belonging="" to="" level="" 3="" energy="" />
The size of the energy efficiency ratio reflects the cooling capacity of the air conditioner for every 1000 W of electric power consumed, and also reflects the energy saving of different air conditioner products. The greater the energy efficiency ratio, the smaller the electrical power required to use the product, and the more power it saves.
Then, do we have to buy a first-class energy efficiency when buying air conditioners?
Of course, local tyrants please feel free. The first-level energy efficiency is to save electricity, but how much can it save? But the same air conditioner level energy efficiency is more than a few hundred and three thousand is known to everyone.
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According to the energy efficiency rating on the national standard, the first-level energy efficiency is greater than or equal to 3.6, the second-level is greater than or equal to 3.4, and the third-level is greater than or equal to 3.2. If the energy efficiency is less than 3.2, it is a high energy-consuming product. That is to say, assuming that the first-class energy-efficient air-conditioning refrigeration consumes 1 degree of electricity, to achieve the same cooling effect, the secondary energy-efficient air conditioner consumes 1.05 kWh, while the three-stage energy-efficient air conditioner consumes 1.12 kWh. The first level can be more than 12% of the electricity bill in the third level.
But the account is not so counted.
Because energy efficiency is high, in addition to power saving, it means that the air conditioner is better. For example, the air conditioner condenser, the energy efficient air conditioner condenser heat sink material will be better, and the heat dissipation area is also larger, which is also the first-class energy efficiency model. The reason is that the weight of the 2nd and 3rd grade energy-efficiency external machines is several kilograms.
2, the choice of air conditioning horses
In addition to air conditioning energy efficiency, everyone should pay attention to the number of air conditioners. Many people are eager to cool, blindly choose a large number of air conditioners, or unwittingly buy a small number of air conditioners. In fact, we have to choose the right size air conditioner according to the actual space.
If you buy a large number of air conditioners, it is easy to have a large amount of cooling, which causes the air conditioner to frequently start and shut down the compressor. This will inevitably affect the life of the air conditioner in the long run, and the excessive number of horses will obviously lead to an increase in power consumption. Therefore, it is not the greater the number of air conditioners, the better. And if the number of air conditioners you purchase is too small compared to the actual space environment, then the air conditioner will be overloaded in the environmental space, which means that the air conditioner does not have the opportunity to "stop", which is also easy to cause air conditioning. The failure rate increases.
How to choose? Look at this table:
3. Is the frequency or fixed frequency?
We look at the differences between the two from their working principles.
Inverter air conditioner
Compared with the fixed frequency, the inverter air conditioner has one more inverter. When the compressor is working, its power can be constantly changed. Therefore, in addition to the rated power, the inverter air conditioner has more variable frequency power. Taking the rated power of 1 kW as an example, its variable frequency power will be around 0.1 kW - 1.5 kW. After starting up, the inverter will quickly enter the maximum frequency. The air conditioner can run at 1.5 kW and quickly reach the set temperature.
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The frequency conversion has more than one frequency converter than the fixed frequency. In addition to the price higher than the fixed frequency air conditioner, its functionality is slightly different:
1 liter / cool down: After the inverter air conditioner is turned on, it can run at the maximum inverter power exceeding the rated power to reach the predetermined temperature. When the indoor temperature drops, the frequency of the compressor begins to slowly adjust, and then the indoor temperature is adjusted.
2 Power saving, noise reduction: Since there is almost no repeated start/stop, the noise is reduced, and after reaching the set temperature, it runs at low power, saving power.
3 Small temperature difference: When the inverter air conditioner reaches the set temperature, it will run at low speed to maintain the set temperature, so the temperature difference will be small.
Fixed frequency air conditioner
The power of the fixed-frequency air conditioner is fixed, and it operates at a fixed power after being turned on. When the external unit reaches the set temperature, it will stop. After the temperature sensor senses the indoor temperature change, the external machine starts running, and so on.
However, there is a time difference between the change of the indoor temperature and the restart of the external machine, which leads to the sudden cold and hot, and the frequent start and stop of the external machine is also the reason why the fixed frequency air conditioner is more expensive. Therefore, since the compressor of the fixed-frequency air conditioner is frequently started, compared with the inverter air conditioner that does not need to start and stop, the power consumption is relatively high. The high power consumption depends on the running time of the air conditioner. The longer the running time, the more times the fixed frequency air conditioner stops, and the more power consumption is. Moreover, since the control error of the inverter air conditioner is small (high sensitivity) and the temperature fluctuation is small, in each temperature control loop, the wasted electric energy is much less than the fixed frequency air conditioner, so the longer the running time, the more energy-saving the inverter air conditioner is. the reason.
In summary, the inverter air conditioner has higher energy efficiency coefficient than the fixed frequency air conditioner, and the high energy efficiency means more power saving, the air conditioning performance is relatively better, and the use is more comfortable. However, from the economic point of view, the fixed-frequency air conditioners are moderately priced, but the electricity costs are later, while the inverter air conditioners have higher prices. The longer the service life, the lower the cost will be.