What does inverter air conditioner mean?

Definition and terminology of air conditioning

What is inverter air conditioning?

Working principle of variable frequency air conditioner

Difference between frequency conversion air conditioner and ordinary air conditioner

Advantages of inverter air conditioner ① Energy saving:

② Low noise:

③ High temperature control accuracy;

(4) Fast temperature adjustment:

⑤ Low pressure requirements:

6. Low ambient temperature requirements:

⑦ One-for-two intelligent temperature control:

8 Keep the room temperature constant:

Disadvantages of inverter air conditioner: First,

second

Third, it is not so cost-effective.

Fourth, maintenance and life.

Selection and use of variable frequency air conditioner

Frequency conversion air conditioner for home appliances going to the countryside

Development prospect of driving mode of variable frequency air conditioner (1)

(2) Manufacturing technology

Ac frequency conversion:

DC frequency conversion:

48% DC frequency conversion energy saving is partial and comprehensive.

Fluorine-free frequency conversion is the development direction of frequency conversion air conditioning. Definition and terminology of air conditioning

What is inverter air conditioning?

Working principle of variable frequency air conditioner

Difference between frequency conversion air conditioner and ordinary air conditioner

Advantages of inverter air conditioner ① Energy saving:

② Low noise:

③ High temperature control accuracy;

(4) Fast temperature adjustment:

⑤ Low pressure requirements:

6. Low ambient temperature requirements:

⑦ One-for-two intelligent temperature control:

8 Keep the room temperature constant:

Disadvantages of inverter air conditioner: First,

second

Third, it is not so cost-effective.

Fourth, maintenance and life.

Selection and use of variable frequency air conditioner

Frequency conversion air conditioner for home appliances going to the countryside

Development prospect of variable frequency air conditioning

(1) machine drive mode-(2) manufacturing technology-AC frequency conversion: DC frequency conversion: 48% energy saving is based on partial fluorine-free frequency conversion, which is the development direction of frequency conversion air conditioning.

brief introduction

Frequency conversion air conditioner is based on ordinary air conditioner, which selects special frequency conversion compressor and adds frequency conversion control system. Its basic structure and refrigeration principle are exactly the same as those of ordinary air conditioners. The main engine of variable frequency air conditioner can automatically change speed continuously, which can automatically provide the required cooling (heating) amount according to the room situation; When the indoor temperature reaches the expected value, the air-conditioning host will run at a constant speed that can accurately maintain this temperature, and realize "non-stop operation", thus ensuring the stability of the ambient temperature. The following focuses on the advantages, selection, installation and use of inverter air conditioners.

[Edit this paragraph] Definition and terminology of air conditioning

1. Room air conditioner

A device that directly supplies treated air to a sealed space, room or area. It mainly includes refrigeration system for refrigeration and dehumidification, air circulation purification device and heating and ventilation device. They can be assembled in a box or designed as a component system to be used together. Hereinafter referred to as air conditioning.

2. The heat pump absorbs heat from outdoor low-temperature air and releases heat to indoor air by changing the running direction of refrigerant in the refrigeration system. The refrigeration system can also include air circulation, purification device and humidification and ventilation device.

3. Electric heating device for heating

Electric heating devices that only use electric heating methods and electric heating devices (including electric heating devices installed later) that use temperature switches (switches that operate due to indoor and outdoor temperatures and other factors) to switch from heat pumps to electric heating devices.

4. The auxiliary electric heating device for heating is used in conjunction with the heat pump to heat the electric heating device (including the electric heating device installed later). 5. Refrigeration capacity (refrigeration capacity)

When the air conditioner operates under specified conditions, the sum of heat taken away from the sealed space, room or area per unit time can be divided into rated cooling capacity and rated intermediate cooling capacity, and the unit is W.6.. Cooling power consumption

The total power consumed by air conditioner with refrigeration can be divided into rated cooling power consumption and rated intermediate cooling power consumption, and the unit is W.7. Heating capacity (heating capacity)

When the air conditioner operates under the specified conditions, the total heat delivered into a closed space, room or area per unit time can be divided into customized heating quantity and rated intermediate heating quantity, and the unit is W.

Note: When the heat pump only has heating function, its heating capacity (quantity) is called heat pump heating capacity (quantity). 8. Heating consumes electricity.

The total power consumed by air conditioner with heating capacity can be divided into customized heat consumption power and rated intermediate heat consumption power, and the unit is W.

Note: When there is only heat pump heating function, its heating power consumption is called heat pump heating power consumption. 9. Energy efficiency ratio

Energy Efficiency Ratio (EER) The ratio of the cooling capacity to the effective input power of an air conditioner under rated working conditions and specified conditions, and its value is expressed by W/W. Under specified conditions, the measured EER should not be less than 90% of the specified value, and its value is a multiple of 0.0 1.

10. coefficient of performance (COP) is the ratio of heating capacity to effective input power of air conditioner under rated working conditions (high temperature) and specified conditions, and its value is expressed by w/w. ..

Note: Effective input power refers to the average electric power input to the air conditioner per unit time, including: 1) compressor operation input power and defrosting input power (except auxiliary electric heating device not used for defrosting);

2) Input power of all control and safety devices; 3) Input power of heat transfer transmission devices (fans, pumps, etc.). )

Energy efficiency ratio and performance coefficient reflect the energy-saving ability of air conditioning. The national standard stipulates that its value is a multiple of 0.0 1. The greater the EER and COP, the more energy-saving the air conditioner is. For example, the nominal cooling capacity of air conditioners A and B is 2500W, the rated input power of A is 860W, and the rated input power of B is 880W W. The energy efficiency ratio of them is: A is 2.9, B is 2.8, and A saves more electricity than B.

Table 1 energy efficiency ratio (EER), coefficient of performance (COP) rated cooling/heating capacity (KW)EER COP(W/W)

Integral split water cooling

≤2.52.502.70

& gt2.5~4.52.602.80

& gt4.5~7. 12.502.70

& gt7. 1~ 142.552.70

≥ 14~282.402.75

Note: T2 and T3 air conditioners can be implemented by reference. 1 1. SEER(CSPF) in cooling season and SCOP(HSPF) in heating season.

SEER: the ratio of total indoor heat taken away by air conditioner during cooling operation to total power consumption in cooling season.

SCOP: In the heating season, the ratio of the total heat added in the room to the total electricity consumed by the air conditioner during heating operation. 12. Circulating air volume (indoor air volume)

Under the rated refrigeration operation condition, when the ventilation door and exhaust door are completely closed (if any), the air volume sent by the air conditioner into the enclosed space, room or area per unit time is m/s(m/h) 13. Noise.

The sound made by the air conditioner when it is running is the noise of the air conditioner. The noise of air conditioning is divided into indoor noise and outdoor noise. The indoor noise is low, mainly due to the operation of the motor and the rotation of the fan. Outdoor noise comes from compressor and outdoor fan, which is higher than indoor noise. The noise value specified in GB/7725-96 should not be higher than that specified in the table below.

When the air conditioner is operating under rated cooling and specified heating conditions, the noise measurement value (sound pressure level) of T 1 air conditioner in semi-anechoic room shall conform to the provisions in the table, and the noise measurement value in full anechoic room shall be-1dB(A) of the value shown in Table 2.

Table 2 rated cooling capacity of split air conditioner w indoor noise dB(A) outdoor noise dB(A) noise value (sound pressure level)

& lt2500≤45≤55

2500~4500≤48≤58

& gt4500~7 100≤55≤62

& gt7 100≤62≤68

[Edit this paragraph] What is inverter air conditioning?

Simply put, inverter air conditioner is to add a frequency converter to the structure of traditional air conditioner. The heart of compressor air conditioning

Speed directly affects the efficiency of air conditioning, and frequency converter is a control system used to control and adjust the speed of compressor, so that it is always in the best speed state, thus improving the energy efficiency ratio (saving 20% ~ 30% compared with conventional air conditioning). Inverter air conditioners have the following characteristics:

(1) the starting current is small, and the rotating speed is gradually accelerated. The starting current is1/7 of that of conventional air conditioners; ②

There is no problem of cold and heat, because the frequency conversion air conditioner gradually reduces the rotation speed as the temperature approaches the set temperature, gradually reaches the set temperature and keeps the balance between low-frequency operation and cold loss, thus keeping the indoor temperature stable; ③

The noise is lower than that of the conventional air conditioner, because the inverter air conditioner uses a double-rotor compressor, which greatly reduces the swing imbalance and makes the outdoor unit vibration very small, which is about1/2 of that of the conventional air conditioner; ④

The cooling and heating speed is 1 ~ 2 times faster than that of conventional air conditioners. Frequency conversion air conditioner adopts electronic expansion and throttling technology, and the microprocessor controls the opening of the valve according to the information collected by the temperature sensors at the inlet and outlet of the expansion valve and the suction pipe of the compressor, so as to achieve the purpose of rapid cooling and heating.

[Edit this paragraph] Working principle of inverter air conditioner

"Frequency conversion" adopts advanced technology, and the voltage is small when starting, which can be started at low pressure and low temperature, and can improve the situation that air conditioning is difficult to start in some areas in winter due to unstable voltage or low indoor temperature. Because of the stepless speed change of the compressor, it can also meet the needs of refrigeration and heating in a larger area.

The so-called "variable frequency air conditioner" is a concept produced by comparing with the traditional "fixed frequency air conditioner". As we all know, the grid voltage in China is 220 volts and 50 hertz, and the air conditioner working under this condition is called "fixed frequency air conditioner". Because the power supply frequency can't be changed, the rotating speed of the compressor of the traditional fixed frequency air conditioner is basically unchanged. By constantly "starting and stopping" the compressor to adjust the indoor temperature, it is easy to cause the room temperature to be hot and cold between starting and stopping, which will consume more electricity. In contrast, the inverter of "variable frequency air conditioner" changes the power supply frequency of the compressor and adjusts the speed of the compressor. According to the compressor speed, the room temperature fluctuates little, consumes less electricity, and greatly improves the comfort. Frequency conversion air conditioner with frequency conversion control technology can automatically select heating, cooling and dehumidification operation modes according to the ambient temperature, so that the room can reach the required temperature quickly in a short time with low rotation speed and low energy consumption, and fluctuate with small temperature difference, thus achieving rapid, energy-saving and comfortable temperature control effect.

High power supply frequency, high compressor speed and large refrigeration (heat) capacity of air conditioner; When the power supply frequency is low, the cooling (heating) capacity of the air conditioner is small. This is the so-called "fixed frequency" principle. The core of inverter air conditioner is its inverter, which is a high-tech that came out in the 1980 s. It realizes the automatic adjustment of motor working frequency through current conversion, and changes the fixed grid frequency of 50Hz into frequency conversion of 30 to 130Hz, thus completing a new revolution of air conditioning. At the same time, the power supply voltage range reaches 142V to 270V, which completely solves the problem that the air conditioner cannot work normally due to the unstable power grid voltage. Every time the inverter air conditioner is used, it usually heats or cools the air conditioner with maximum power and air volume, and quickly approaches the set temperature. Because the inverter air conditioner can increase the low-temperature heating capacity by increasing the working frequency of the compressor, the maximum heating capacity can reach 1.5 times of that of the same level air conditioner, and it can still maintain good heating effect at low temperature. In addition, the general split machine has only four speeds that can be adjusted, but when the indoor fan of the inverter air conditioner runs automatically, the speed will change within the range of 12 with the working frequency of the compressor. Because the rotation speed of the fan is reasonably matched with the capacity of the air conditioner, the quiet operation with low noise is realized. When the air conditioner runs at high power and quickly approaches the set temperature, the compressor will run at low speed and low energy consumption, and only use the required power to maintain the set temperature. This not only stabilizes the temperature, but also avoids the life attenuation caused by frequent start and stop of the compressor, greatly reduces the power consumption and realizes high efficiency and energy saving.

[Edit this paragraph] The difference between inverter air conditioner and ordinary air conditioner.

The most power-consuming part of the air conditioner is the compressor. Compared with ordinary air conditioners, variable frequency air conditioners have a frequency converter, which can be used to adjust the speed of the compressor. The running speed of inverter air conditioner will slow down according to the decrease of indoor temperature, while the compressor of ordinary air conditioner always runs at the maximum speed. Therefore, under certain circumstances, inverter air conditioners save electricity than ordinary air conditioners. But why is it often not as energy-saving as the merchants say? That's because, when the inverter air conditioner and ordinary air conditioner are turned on, because the indoor temperature has not reached the set temperature, they all run at maximum power. At this time, the inverter air conditioner may consume more power because the circuit is more complicated than the ordinary air conditioner. When the indoor temperature reaches the set temperature, the inverter air conditioner will reduce the running speed of the compressor through the inverter, and of course, the power consumption will also be greatly reduced. However, ordinary air conditioners cannot adjust the speed of the compressor after the indoor temperature reaches the set temperature, so the compressor must be turned off, and the power consumption is lower than that of inverter air conditioners. However, when the compressor is started/stopped, it will generate instantaneous high pressure, and frequent start-up and stop will damage the life of the compressor to some extent.

The advantages of frequency conversion air conditioner are: more accurate temperature control, low noise, more comfortable human body and long compressor life. The advantages of ordinary air conditioners are: cheap.

By the way, the internal frequency conversion circuit of household frequency conversion air conditioner is different from that of industrial frequency converter. Frequency converter is an independent device, which can play the role of energy saving, speed regulation, automatic control and equipment protection. It is widely used, such as energy-saving speed regulation of fans, constant pressure water supply in residential areas, energy-saving control of escalators, energy-saving control of central air conditioning and so on. Household inverter air conditioners may not save electricity, but industrial inverters have high energy-saving efficiency. The famous domestic inverter manufacturers are Huichuan, Tengteng and Inverter.

[Edit this paragraph] Advantages of inverter air conditioner

(1) energy saving:

Because the inverter air conditioner can adjust the running speed of the compressor, the heart of the air conditioner, at any time through the built-in inverter, so as to make rational use of energy; Because its compressor will not be turned on frequently, it will keep the compressor in a stable working state and save energy by more than 30% as a whole. At the same time, it also has a quite obvious effect on reducing noise and prolonging the service life of air conditioners.

② Low noise:

Due to the balanced operation of the inverter air conditioner, the vibration and noise are reduced;

③ High temperature control accuracy;

It can control the cooling (heating) of the air conditioner by changing the speed of the compressor. The amount of refrigeration (heat) varies, for example, the refrigeration capacity of 36GW frequency conversion is 360-400W, and the heating capacity is 300-6800W, so the indoor temperature control can be accurate to 65438 0℃, which makes people feel very comfortable.

(4) Fast temperature adjustment:

When there is a big difference between the room temperature and the set temperature, the inverter air conditioner will work at the maximum power as soon as it is turned on, so that the room temperature will rise or fall to the set temperature quickly, and the cooling (heating) effect is obvious;

⑤ Low pressure requirements:

Inverter air conditioners have strong adaptability to voltage, and some inverter air conditioners can even be started at 150- 240V;

6. Low ambient temperature requirements:

Inverter air conditioners have strong adaptability to the ambient temperature, and now they can even be started at the ambient temperature of 15t.

⑦ One-for-two intelligent temperature control:

It can intelligently identify the size of the room, distribute the amount of cold (heat), and keep the room of different sizes at the same temperature.

8 Keep the room temperature constant:

Variable frequency air conditioner adopts variable frequency compressor, which can automatically adjust the operating frequency of compressor according to the change of room cooling (heating) load. After reaching the set temperature, the inverter air conditioner runs at a lower frequency, avoiding the discomfort caused by the drastic change of room temperature. When the load is small, the operating frequency is low. At this time, the compressor consumes less power, and at the same time, it avoids frequent start-stop and saves more electricity.

[Edit this paragraph] Disadvantages of inverter air conditioner

first

For Europe and America, most families are used to leaving the air conditioner on all day, or even never turning it off, because they want to get hot or cold effects as soon as they enter the room, and because the electricity price in their country is relatively cheap. As for our country, most families don't always turn on the air conditioner, so the advantages of inverter air conditioner will not be reflected, because inverter air conditioner needs the continuous operation of air conditioner to achieve the purpose of saving electricity.

second

The technology of inverter air conditioner is not perfect. Although businesses tout the advantages of frequency conversion, as we all know, the more advanced the machine is, the more complicated the parts are, and the probability of failure will increase accordingly (of course, at present, because the frequency conversion technology of various domestic manufacturers has not reached a relatively high level, and the technology of the core components of frequency conversion is still in the hands of the Japanese ...)

Third, it is not so cost-effective.

Let's calculate the cost of air conditioning first. For example, the air conditioner is used for three months a year, 30 days a month, and runs for 8 hours on average every day. The cooling operation time is 960 hours, and the average power of the air conditioner is 2000W W W. During the cooling period, the total power consumption of the fixed-speed five-level air conditioner (EER=2.6) is 1920 degrees. If you use the current Shanghai standard five-level inverter air conditioner (EER=3.3), but the current inverter air conditioner is more than 1000 yuan more expensive than ordinary air conditioners!

In addition, taking northern cities as an example, many areas have heating facilities in winter, and the season of using air conditioners is only about three months each year. Most of the time the air conditioner is idle, and the advantages of inverter air conditioner are not obvious.

Fourth, maintenance and life.

If we compare the internal structure of inverter air conditioner and constant speed air conditioner outdoor unit, we can see that the internal structure of variable speed air conditioner is much more complicated, with almost three times more internal parts and one more PCB board. As we all know, the more complex the structure of household appliances, the more parts there are, and the life of the whole machine will be relatively shortened. There have been relevant investigations, and various quality problems will appear after the inverter air conditioner is used for about three years.

Take Hisense Air Conditioning as an example, its inverter air conditioner will provide a three-year warranty period and the compressor will provide a five-year warranty period. Based on the previous electricity bill, if 150 yuan is saved every year, the electricity bill will be less than 1000 yuan after five years of use, but the product has been insured. This will increase the maintenance cost of air conditioners.

Due to economic considerations, the advantages of inverter air conditioners are greatly reduced, and it is not cost-effective to spend one or two thousand yuan to buy an inverter air conditioner at this stage. Of course, from the perspective of energy saving, inverter air conditioners do have certain advantages, but should we let our consumers pay for this more than 1000 yuan?

On the other hand, the product nature of inverter air conditioner determines that it must be started at a high speed, and then it can continue to run at a low speed. So for those users who are used to constant-speed air conditioners, sometimes they feel that the cooling (heating) of air conditioners is not strong enough and the speed is not fast enough. Out of habit, inverter air conditioners may not be suitable for this kind of people.

[Edit this paragraph] Selection and use of inverter air conditioners

Frequency conversion air conditioner Because frequency conversion air conditioner is a high-tech product composed of computer-controlled frequency converter and frequency conversion compressor, users should pay attention to the following points when purchasing, installing and using it:

① When purchasing, the number of inverter air conditioners should be determined according to the room area (generally, one inverter air conditioner can be used in a room of about 14 square meters), and it should be avoided as far as possible in the case of over-area;

(2) In the process of installation and maintenance, when refrigerant needs to be added, the air conditioner should be set to trial operation mode or the inverter compressor should be set to 50HZ operation by adjusting the set temperature, and then the refrigerant should be added according to the quantity;

③ The outdoor unit of inverter air conditioner has inverter controlled by microcomputer, and its printed circuit board is easy to be damaged in high temperature and humid environment, so its outdoor unit should be installed in a dry and ventilated place to avoid sun exposure and rain. If the outdoor unit automatically shuts down after starting, it should be stopped immediately for maintenance to prevent the fault from expanding;

④ Don't set the temperature too low in daily use, so as to avoid the air conditioner running at high speed for a long time. It is best to set it to automatic operation mode, which can not only cool quickly but also save electricity.

⑤ When purchasing, it depends on whether the technology is mature. At present, many air-conditioning enterprises in China have launched their own frequency conversion series products, and they have also adopted many nice names. However, under the financial crisis, consumers are becoming more rational and simpler.

The era of attracting consumers by "frequency conversion" labels has passed, and it is necessary to come up with "real skills"-a mature core technology.

6. When buying, see if the quality is stable. Quality is the lifeline of products, and high-quality products can stand on the market for a long time and be accepted by consumers. For the "new favorite" inverter air conditioner, its quality stability is largely related to whether the technology is mature.

Good relationship. However, the product quality is not up to standard and needs to be verified by a third party. ⑦ Whether the service is professional. For the inverter air conditioner with complex technology, the simple "air cooling and heating" service is not enough.

In order to meet the needs of consumers, professional services will become another indicator for consumers to choose air conditioners.

[Edit this paragraph] Choose inverter air conditioner for home appliances going to the countryside.

According to the latest National Bidding Announcement of Home Appliances Going to the Countryside (Air Conditioning) Project issued on June 5438+February 3, 2009, inverter air conditioners were selected as the national bidding category for home appliances going to the countryside for the first time. According to the tender announcement, the winning inverter air conditioner products can be subsidized by the state finance in the form of direct subsidy at 13% of the product sales price, of which the maximum subsidy for wall-mounted inverter air conditioners is 325 yuan, and the maximum subsidy for floor-mounted inverter air conditioners is 520 yuan. According to industry insiders, inverter air conditioners are selected for home appliances to the countryside for the first time and receive national policy subsidies, which will promote the further popularization of inverter air conditioners and is expected to receive more national policy support.

The tender announcement shows that each bidder can bid for up to 50 models of products. When asked about the proportion of inverter air-conditioning products in the bidding products, Mr. Wu said that it was not convenient to disclose before the winning bid was announced.

It is understood that the concept of energy saving and environmental protection of inverter air conditioners has been strengthened from an imported concept to a quality trust and market trend after nearly ten years of enlightenment education. Consumers' consumption psychology is becoming more and more rational and mature, and the demand for energy-saving, environmental protection and comfortable inverter air conditioners is becoming stronger and stronger. As the first leading enterprise in China to promote inverter air conditioners in all directions, Midea, with its keen market judgment and strong confidence in the future development of inverter air conditioners, constantly refreshes the technical benchmark, product benchmark and price benchmark of inverter air conditioners, and actively develops and produces air conditioning products that are more suitable for rural consumption characteristics, reliable in performance, guaranteed in quality, energy-saving and environmentally friendly, and inexpensive according to the new trend of farmers' consumption upgrading.

Frequency conversion air conditioner saves about 30% electricity compared with constant speed air conditioner, and it is more comfortable and environmentally friendly. At present, more than 90% of Japan's air-conditioning market is inverter air-conditioning, and its market share in developed countries such as Europe and America is also above 50%. Since the cold year of 2009, the development of inverter air conditioners in the domestic market has changed with each passing day, with the sales growth rate reaching 56.24%, accounting for 17.33% of the total sales of air conditioners. According to the prediction of relevant experts, the market share of inverter air conditioners is expected to reach 30% in 20 10 freezing year, based on the new high in 2009 and the rapid start of the third and fourth grade markets, and the expansion momentum is strong. It can be predicted that with the implementation of energy efficiency standards for inverter air conditioners, inverter air conditioners will be included in the government procurement list, and the subsidy policy for inverter air conditioners for home appliances to the countryside will be put in place. This is the general trend and the will of the people.

[Edit this paragraph] Development prospect of inverter air conditioner

Although in China, inverter air conditioners are not mature for various reasons, according to authoritative data, they have become the technical platform of air conditioning industry in Japan, Europe and America, and about 98% of air conditioners are inverter air conditioners.

According to the current national macro-control and the situation of air-conditioning manufacturers, inverter air-conditioning is bound to become a future trend in China.

"Variable frequency air conditioner" adopts advanced technology, which can be started at low voltage, low temperature and low voltage, which can improve the situation that air conditioners are difficult to start due to unstable voltage or low outdoor temperature in some areas in winter. Because of the stepless speed change of the compressor, it can also meet the heating requirements of a larger area. However, the price of "variable frequency air conditioner" is usually several hundred yuan higher than that of "fixed frequency air conditioner".

Judging from the current development of frequency conversion technology, it is mainly manifested in the following two aspects:

(1) Driving mode of the machine-

From AC frequency conversion to DC speed regulation;

(2) Manufacturing technology

VVVF frequency conversion technology, PWM pulse width control technology, vector control technology. Advantages of frequency conversion technology: (1) or faster heating speed (2) better comfort. (3)

There is no big current impact on the circuit when the inverter air conditioner is started.

Frequency conversion air conditioning is to use frequency conversion technology to adjust the speed of compressor, and control the output power (that is, cooling and heating capacity) according to the change of compressor speed, thus controlling the room temperature. Divided into AC frequency conversion and DC frequency conversion.

Ac frequency conversion:

The AC variable frequency compressor is used to adjust the voltage conversion twice to achieve the purpose of saving electricity.

DC frequency conversion:

The DC digital variable speed compressor only needs one voltage conversion, which saves electric energy 18-40% compared with AC frequency conversion, which embodies the advantages of DC frequency conversion technology.

In order to realize its function, variable frequency air conditioner is equipped with variable frequency compressor and variable frequency controller system based on the principle of constant frequency air conditioner, and the capillary tube is replaced by electronic expansion valve. Auxiliary components are: defrosting valve, double capillary. However, at present, inverter air conditioners are prone to inferior quality, that is, low-priced components are used instead of imported high-quality components. Because of the high cost of its main components, high sales price and high maintenance cost.

Because the circuit system of variable frequency air conditioner is more complicated than that of fixed frequency air conditioner, the system reliability is lower than that of fixed frequency air conditioner, and it is more prone to failure than that of fixed frequency air conditioner: maintenance is difficult and the price is expensive. The high-frequency electromagnetic wave generated in the process of speed regulation is higher than that of constant-speed air conditioning, which is harmful to human body. Such long-term effects will lead to a higher incidence of brain cancer than the general population. The outdoor unit of inverter air conditioner has an inverter controlled by microcomputer, and its printed circuit board is easy to be damaged under high temperature and high humidity.

Inverter air conditioners are usually synonymous with high-end air conditioners, but there are many low-cost inverter air conditioners on the market now. What are the disadvantages of low-cost inverter air conditioners? It is mainly to cut corners, such as buying domestic low-cost inverter compressors instead of high-quality inverter compressors. Using capillary instead of electronic expansion valve to obtain high profits. It is to use a small-capacity variable-frequency compressor on a large-capacity power machine. Production of single cooling frequency converter, reducing the use of four-way valve, improving profits.

Variable frequency air conditioner

[Edit this paragraph] 48% of DC frequency conversion energy saving is partial and comprehensive.

Experts from China Refrigeration Society pointed out that the bipolar polarity of direct current is fixed, and the current has only one direction, so there will be no alternation and no frequency at all. What about frequency conversion? At present, the so-called "DC variable frequency air conditioner" advertised in the market is actually a DC speed regulating air conditioner, and its DC speed regulating technology is far superior to FM technology. However, in order to make full use of people's thinking mode, marketers put on the original inverter hat without thinking, so they made a joke.

According to reports, DC speed regulation only goes through a voltage conversion, so the energy loss is smaller than that of FM speed regulation. In addition, because the stator of this DC motor is a permanent magnet, the stator current consumption of the three-phase AC asynchronous motor is saved, so the electrical efficiency from the grid power supply to the motor is higher than that of frequency modulation speed regulation, saving some energy. However, some manufacturers exaggerate the energy saving of this internal regulation system as the energy saving of the whole machine, so there is a saying that energy saving is 48%. Experts said that energy saving mainly depends on the design and configuration of the refrigeration system and the size of the refrigeration coefficient of the system. It is not difficult to see that the improvement of fixed-speed air conditioning to variable-speed air conditioning is mainly to improve its automatic adjustment mode and improve the quality of the machine, rather than saving energy. However, it should be pointed out that speed regulation is only a basis to improve the quality of air conditioning operation, and the real improvement depends on the matching of refrigeration system. The key components to adjust the cooling capacity of the system are throttling and decompression components. If you don't change from a constant damping capillary to an electronic pressure reducing valve with adjustable damping suitable for speed regulation range.

(expansion valve), then, this kind of speed regulating air conditioner is of little significance, and even consumes the electric energy needed for internal conversion. At present, the efficiency ratio of air conditioners is generally between 2.6 and 2.9, and rarely exceeds 3.0. So the propaganda of saving energy by 48% is inaccurate.

Fluorine-free frequency conversion is the development direction of frequency conversion air conditioning.

Looking around the world, at present, the penetration rate of fluorine-free inverter air conditioners in Japan has reached more than 95%, and more than 90% of the air conditioners sold in the European market are fluorine-free environmental protection air conditioners using R4 10a new refrigerants. Relevant policies in North America also announced that R22 refrigerant will be completely banned on 20 10. The Copenhagen conference held at the end of 2009 also accelerated the elimination of fluorine-containing air conditioners, and the non-fluorination of inverter air conditioners began to count down. At this point, after 16 years of historical precipitation, the air conditioning era dominated by fluorine-free frequency conversion technology in China officially began.

In 2009, China inverter air conditioner entered a brand-new period, with "low carbon" as the leading factor, and the fluorine-free inverter air conditioner represented by the leading new fluorine-free environment-friendly refrigerant gradually replaced the traditional inverter air conditioner. Haier realized the "low-carbon" transformation ahead of schedule, and with the joint efforts of Chinese and Japanese experts, it overcame many technical problems of inverter air conditioners in one fell swoop, and achieved the perfect integration of world-leading PAM pulse amplitude modulation technology, 180 sine wave DC frequency conversion technology and the third-generation scroll compressor technology, and realized 1 minute rapid cooling and 2-minute rapid heating ahead of schedule, with an energy efficiency ratio as high as 6.