Is it better to buy frequency conversion or fixed frequency for household air conditioners?

Air conditioners on the market can be divided into fixed frequency/variable frequency air conditioners. What is frequency conversion? What is a fixed frequency? Which is better?

Let's first understand the working principle of air conditioning:

Air conditioning can be simply understood as "hot porter". After the air conditioner turns on refrigeration, the compressor runs, and the refrigerant (refrigerant) exchanges heat through the heat exchanger (evaporator and radiator) of the air conditioner under the action of the compressor, thus "taking away heat" and taking away the indoor temperature.

Therefore, after the air conditioner is turned on for cooling, the indoor air will blow out "cold air" and the outdoor fan will blow out "hot air".

The difference between fixed frequency air conditioner and variable frequency air conditioner is actually "the difference of compressor technology".

The compressor frequency of fixed frequency air conditioner is fixed. Therefore, when the indoor temperature reaches the preset value, the compressor of the air conditioner will stop running (the outdoor fan will not rotate), and the compressor will restart until the indoor temperature rises and is sensed by the temperature sensor, and then continue to maintain the indoor temperature.

Frequency conversion air conditioner Frequency conversion air conditioner has a "frequency converter", so the frequency of the compressor is no longer fixed, and the power operation can be changed. Therefore, when the indoor temperature reaches the preset value, the compressor of the inverter air conditioner will not stop running, but will run at low frequency (the fan rotates at low frequency) to maintain the indoor temperature.

Is frequency conversion better or fixed frequency better? It is precisely because the situation of fixed frequency air conditioning and variable frequency air conditioning is different in operation, so the specific performance is different, but there is no doubt that variable frequency air conditioning is better.

The advantages of inverter air conditioning mainly focus on experience and air conditioning.

Inverter air conditioner can maintain low-frequency operation and indoor temperature, so the temperature control of inverter air conditioner is better and gives people a more comfortable feeling. The temperature control of inverter air conditioner is worse than that of inverter air conditioner.

Frequency conversion can run at low frequency and low power, so it saves more electricity than fixed frequency air conditioning in terms of power consumption and energy saving. Constant-frequency air conditioners are frequently started and stopped, with fixed power and high power consumption.

The noise of variable frequency air conditioner is relatively small when running at low power, while the noise of fixed frequency air conditioner is large at the moment of start and stop.

Of course, inverter air conditioners also have disadvantages: higher cost, more expensive price and higher maintenance cost.

With the improvement of living standards, no matter how sultry summer is, as long as there is air conditioning, there is nothing. It seems that summer is coming. Is the air conditioner being prepared at home again? Maybe some friends want to buy air conditioners again. So which is better, fixed frequency air conditioner or variable frequency air conditioner? Fortunately, the master reminded me that I almost chose the wrong one.

Working principle of fixed frequency and frequency conversion

Let's talk about the difference between fixed frequency air conditioning and variable frequency air conditioning. Fixed frequency means that you set a temperature, and the air conditioner will always work at this rhythm. Whether it is cold or hot, it is necessary to manually adjust the temperature to maintain comfort.

But frequency conversion will not, it will run at the fastest power when it is turned on, and strive to cool and heat in the shortest time. And it can automatically adjust the temperature, so that you are always in a comfortable state.

Fixed frequency or variable frequency?

We mainly analyze from three aspects that people are most concerned about.

1, energy saving

They are all living people. Of course, buying home appliances is still based on energy saving, which one to save money. Theoretically, inverter air conditioner is more energy-saving than fixed frequency air conditioner, but people who buy inverter air conditioner don't feel where the energy is.

I believe many families are often reluctant to turn on the air conditioner in summer. They only open when the weather is very hot and close when the temperature drops after an hour or two. Because the inverter air conditioner will save more electricity only if it is used continuously, it has not saved electricity after buying the inverter air conditioner. For ordinary families, it is more practical to use fixed frequency.

2. Noise

In fact, noise has nothing to do with fixed frequency and frequency conversion, but even the best air conditioner has sound. When the internal unit chooses the air supply mode, it will produce a certain sound. But if the noise is too loud, it is not the kind of noise that the internal machine itself should have, so it is necessary to check whether the internal machine is installed horizontally, and so is the external machine.

Of course, there is another situation of outdoor unit. If something presses on the outdoor unit, the air conditioner will vibrate when it works, and it will also produce noise at this time.

Step 3 be comfortable

The main difference between frequency conversion and fixed frequency is that frequency conversion can adjust the temperature according to the room temperature, so that people are always in a comfortable environment. The research and development of inverter air conditioners is also to pursue comfort, so many people buy inverter air conditioners for comfort, not to save electricity.

Fixed frequency and variable frequency have their own advantages and disadvantages. Therefore, I suggest that if the family's economic conditions are average, we should still use fixed-frequency air conditioners, which are cheaper. Then, the structure of fixed frequency air conditioner is relatively simple, so the failure probability is relatively low and the maintenance cost is relatively cheap. In any case, fixed frequency is more practical.

Unless the budget is really insufficient, try to buy inverter air conditioners.

Inverter air conditioning mainly has the following advantages:

1. adopts low-frequency starting, which has small starting current, little interference to the power grid and saves electricity and energy; 2. It can be cooled and heated quickly; 3. The temperature control accuracy of long-term operation after startup can reach 0.5; 4. Low noise: Due to the balanced operation of the inverter air conditioner, the vibration and noise are reduced.

I'm using a domestic brand inverter air conditioner at home, which is a little more expensive than the fixed frequency air conditioner, but the experience is really much better than the fixed frequency air conditioner. Cooling and heating are very fast, and the noise is much less than the fixed frequency air conditioner I used before.

However, inverter air conditioners still have disadvantages: first, the price will be more expensive, and the cost of maintenance after the warranty period will be relatively higher.

In short, I personally suggest that you can choose inverter air conditioners in your family bedroom and places where you turn on your computer for a long time. If you only turn on the computer for an hour or two, you can also choose a fixed-frequency air conditioner, which will be cheaper after all.

Personally, I think it's better to set the frequency. Inverter air conditioner saves electricity, but it is easy to break down and the maintenance cost is high. Generally, the motherboard of frequency conversion computer is much worse, but the fixed frequency computer is not so easy to break down.

This depends on your family situation. If the family's economic conditions are average, let's use a fixed-frequency air conditioner, which is cheaper. Turn on the air conditioner within 5 or 6 hours, and buy the one with fixed frequency and cheap price; On the contrary, it is more energy-saving to buy inverter air conditioners.

The working principle of frequency conversion air conditioner, in air conditioning, frequency conversion technology is a new technology, which changes the frequency of power supply through frequency converter, thus changing the running speed of compressor. It is divided into AC frequency conversion and DC frequency conversion (DC variable speed).

Under the condition of reasonable temperature setting and long-term operation, variable frequency air conditioning will save about 30% electricity than fixed frequency air conditioning. Home use generally does not meet this standard, so inverter air conditioners will not save electricity as you think.

The same number of air conditioners, inverter air conditioners are usually more expensive than fixed-frequency air conditioners 1000 yuan, so the price of fixed-frequency air conditioners is definitely more affordable!

Now in summer, air conditioning has become an indispensable household appliance. But many people always don't know how to start with "frequency conversion" and "fixed frequency".

If you want to know whether to buy a variable frequency air conditioner or a fixed frequency air conditioner, you must first understand what is variable frequency and what is fixed frequency.

Fixed frequency air conditioner is an air conditioner that works all the time under the normal voltage of 220 volts and 50 hertz. As long as the compressor is turned on, it will always work in a state. Because the power grid frequency of 50 Hz is always constant, the compressor speed is also constant.

Frequency conversion air conditioning is simply adding a frequency converter on the basis of fixed frequency air conditioning. Although the compressor is the heart of air conditioning, its speed is controlled by frequency converter. Under the control of frequency converter, the compressor will not be turned on and off frequently, but can only be adjusted quickly and slowly to save electricity.

The above briefly introduces what is fixed frequency air conditioning and what is variable frequency air conditioning. When you understand this, you will have a comprehensive consideration when choosing air conditioning.

1, saving electricity, which is the biggest advantage of variable frequency air conditioning, but this advantage is reflected in the same good insulation environment as fixed frequency air conditioning, working for a long time. At the same time, the longer the working hours, the more prominent this advantage is. If everyone's boot time is not long, it won't save electricity.

2, inverter air conditioning refrigeration speed is fast, because inverter air conditioning in the early stage of work, in order to reduce the temperature to the set temperature as soon as possible, so it will be more "desperate" work. So it seems that the refrigeration effect of inverter air conditioner is better than that of fixed frequency air conditioner. But this "good effect" is the result of more power consumption than fixed-frequency air conditioners at the beginning of work.

3. High temperature control accuracy. Generally, the temperature fluctuation of variable frequency air conditioner is between 0.5- 1 degree, while that of fixed frequency air conditioner is between 2-3 degrees, which makes people feel more comfortable. This kind of fixed frequency air conditioner is not as shameful as it is.

4. When the fixed frequency air conditioner dehumidifies, there will still be cold air blowing out and the compressor will start and stop repeatedly. In the dehumidifying state, the inverter air conditioner runs at low frequency, does not switch on and off frequently, and does not blow out cold air, which makes people healthier.

5. Inverter air conditioners and fixed-frequency air conditioners are much more expensive in the same quantity, which is the biggest "disadvantage" of inverter air conditioners.

According to the comparison of the above two air conditioners, it is suggested that:

If you live in the north, it is not particularly hot in summer, and the working time of the air conditioner is within one or two hours at a time. You'd better buy a fixed frequency air conditioner. If you live in the south, it is hot and humid, and the air conditioner has to work for more than a few hours every day, then inverter air conditioner is necessary.

At present, most air conditioners are inverter air conditioners. Is it really bad to eliminate all fixed-frequency air conditioners? Many people will struggle when buying air conditioners. After all, frequency conversion and fixed frequency are very different. Sales staff strongly recommend inverter air conditioners to you, saying that inverter air conditioners save electricity. Many consumers also think that inverter air conditioners will save electricity before buying them. Let me briefly talk about the quality of down-conversion and fixed-frequency air conditioners. Let's talk about fixed-frequency air conditioners first. Most people are using them. Constant frequency air conditioning means that when the indoor temperature reaches the set temperature, the compressor will automatically stop running, and then the air conditioner will no longer cool. When the indoor temperature rises, the compressor will start cooling again, so it will start and stop repeatedly. Theoretically, the compressor consumes more electricity when it starts, just as the car consumes more oil when it starts. Another point is that the air conditioner will turn around and stop, and the indoor temperature will change back and forth, which will also talk about inverter air conditioner. When the indoor temperature reaches the set temperature, the compressor of the air conditioner will not stop, but the number of revolutions of the compressor is controlled by changing the voltage frequency. At this time, the rotation speed of the compressor is very slow, which avoids the consumption of starting the compressor back and forth, so that the indoor temperature is relatively constant and people will not feel uncomfortable.

Let's sum up:

Advantages of fixed frequency air conditioner: low price, low failure rate and simple and cheap maintenance. The bad thing is that the compressor starts back and forth, which consumes more electricity and the indoor temperature is unstable.

Advantages of inverter air conditioner: People will feel more comfortable and save electricity when the indoor temperature is relatively constant. But the disadvantages are high price, high failure probability and high maintenance complexity.

Personally, the biggest difference between inverter air conditioner and fixed frequency air conditioner is that the temperature of inverter air conditioner is relatively constant, so people will not feel cold and hot for a while when they sleep at night, and will be more comfortable. As for power saving, when the air conditioner with the same power is turned on for one hour, the constant frequency may be 1.0 1 kwh, and the frequency conversion may be 1 kwh, which is considered as power saving. It can be calculated that you have to open thousands.

I have a fixed frequency air conditioner now, and I will definitely not buy a variable frequency air conditioner next time, because variable frequency saves electricity and fixed frequency is cheap, but in the long run, I will lose a lot and the electricity bill will cost a lot more. Fixed-frequency air conditioning is in 20 yuan for one day, and variable-frequency air conditioning may be in 5 yuan. Using 10 air conditioner can save a lot of electricity.

I bought this air conditioner in Changhong on 20 1 1. The quality is very good. 10 didn't spend money to repair it. I just moved back to my hometown from Fuzhou and added ammonia and 40 yuan money once. After I bought it for the third year, the master will handle it. After the warranty period, I didn't collect the money. Sign it. It's still in good use now, and it didn't cost a penny to repair it, but it was used. In July and August, you pay the electricity bill of more than 400 yuan at most once a month, but not every day. But you can use an induction cooker, a rice cooker, a refrigerator and a TV at home. If you don't turn on the air conditioner, more than one month 100 is enough.

If you buy an inverter air conditioner next time, you can turn on the air conditioner for one day without worrying about the electricity bill, then next time you would rather spend an extra thousand dollars to buy an inverter air conditioner that can save electricity.

As an indispensable household appliance in family life, air conditioning is also of special concern to everyone when purchasing. Moreover, air conditioners are divided into frequency conversion and fixed frequency, and businesses are trying their best to use frequency conversion air conditioners. As consumers, they will be obsessed with their own choices and don't know how to buy them.

First, the difference between frequency conversion and fixed frequency

I want to know whether to choose home air conditioner, frequency conversion air conditioner or fixed frequency air conditioner is better. Naturally, you must first understand what frequency conversion and fixed frequency mean, and then you can decide how to choose according to your actual situation.

1. Inverter air conditioner: For air conditioners, its operation mode is also called "hot porter". Frequency conversion air conditioning means that the current operation mode is not fixed, but can be "changed". However, when the indoor temperature reaches the set temperature, the compressor will change from the initial high-speed operation to the low-speed operation, keeping the indoor temperature unchanged, thus reducing the energy consumption to some extent.

2. Fixed frequency air conditioner: Compared with the flexibility of variable frequency air conditioner compressor, fixed frequency air conditioner can only achieve a fixed frequency and cannot be changed. Therefore, even if the indoor temperature reaches a predetermined value after the air conditioner runs, the compressor will not reduce the frequency, but will stop running directly. Only when the temperature sensor senses the change will the compressor start running again, so that the indoor temperature reaches the predetermined temperature value. This is why some people's home temperature has been running for a period of time, including the outdoor fan does not turn, and after a while, the outdoor fan turns again, indicating that it is a fixed frequency air conditioner.

Second, choose air conditioning according to your actual situation.

As long as you buy an air conditioner, the shopping guide will strongly recommend frequency conversion, because the price of frequency conversion is much higher than that of fixed frequency, so that the profit point of the business is higher. But in essence, for different consumer needs, it is not that frequency conversion air conditioner is the best, but it should be decided according to its own actual situation, as follows:

First of all, consider the cost of buying air conditioners: first of all, from the cost of buying air conditioners, fixed frequency is definitely cheaper than frequency conversion. Take an ordinary wall hanging machine. If an inverter air conditioner costs 3,000 yuan, then the fixed frequency should be at least cheaper in 500 yuan; If the cabinet is used for comparison, the price difference is several thousand yuan, so in terms of purchase cost, fixed frequency is cheaper than frequency conversion.

Second, consider the service life: under the same conditions, the service life of fixed-frequency air conditioners is longer than that of variable-frequency air conditioners. This is because the fixed frequency air conditioner does not have much technology, which can be said to be very simple, but it is not easy to break down and has a longer service life. At this point, the quality problems of inverter compressors often occur in inverter air conditioners.

The third is to consider the running time: if the air conditioner runs less than 5 or 6 hours a day, it is recommended to buy a fixed-frequency air conditioner, because the shorter the running time, the more obvious the advantages of the fixed-frequency air conditioner and the more economical it is to combine; On the contrary, the longer the running time, the less power the inverter air conditioner needs.

The third is to consider the location of the city: if it is located in a northern city, it is recommended to use fixed-frequency air conditioning, because the summer temperature in northern cities is generally not high, the utilization rate of air conditioning is very low, and the running time of air conditioning is very short every day, so fixed-frequency air conditioning is more suitable; On the contrary, the climate in southern cities is hot in summer, and the air conditioner has to be turned on for a long time. At this time, frequency conversion is relatively cheap to save a little electricity, but it is not cheap in essence. This is the important misunderstanding to be said below.

Third, frequency conversion air conditioning saves a lot of electricity than fixed frequency.

As long as you buy an air conditioner, the shopping guide will recommend the inverter air conditioner, and also strongly say that the inverter air conditioner is a little more expensive than the fixed-frequency air conditioner, but the inverter air conditioner saves electricity. After a long time, the inverter air conditioner is still suitable. Is it true?/You don't say.

1. It is true that inverter air conditioners save electricity than fixed frequency air conditioners. First of all, it is certain and true that inverter air conditioners save electricity than fixed-frequency air conditioners. No matter from the test data or user usage data, power saving is necessary.

2. The actual cost of inverter air conditioner is higher: the saving value of inverter air conditioner is unexpected, because inverter air conditioner and fixed frequency air conditioner use the same time every year, saving tens of yuan a year. It takes at least 10 years to save the difference between the two forms of purchase, and it is not certain whether the air conditioner can be used 10 years, which should be considered clearly. I believe many people have not thought of this. If you don't believe me, you can get a clear result by calculating the data of two air conditioners. In this way, from the overall operating cost, fixed-frequency air conditioning still needs to save a little, but the advantages of fixed-frequency air conditioning are not easy to be broken, so the advantages are more obvious.

Finally, talk about the decoration and summarize it for everyone:

Focus on whether the household air conditioner is good at frequency conversion or fixed frequency.

Household air conditioners, especially those used in bedrooms, had better buy inverter air conditioners. Compared with fixed frequency air conditioning, variable frequency air conditioning has two advantages. The first is to save electricity and energy, generally saving about 30%. The second is comfort, because the inverter air conditioner has accurate temperature control and can reach 0.10.5℃, which is very comfortable. Of course, the fixed frequency air conditioner has simple structure, low price and long service life, and it is also a good choice to install it in the living room or study.