At the moment, it is just three days, the temperature is climbing, many places are extremely hot, and it is time to rely on air-conditioning to continue life, "hot" to talk about how to choose air-conditioning. Don't look at the air conditioners are almost the same, there are a lot of doorways inside, this article starts with five questions, including the common frequency and fixed frequency who chooses, the first-level energy efficiency and the third-level energy efficiency, which "number of horses" What do you mean, what kind of refrigerant is good, and the functions of formaldehyde/self-cleaning are useful? You must first clear them before buying air conditioners.
Who should choose the frequency conversion and fixed frequency?
The difference between inverter air conditioner and fixed frequency air conditioner is mainly the compressor used. The compressor is equivalent to the heart of the air conditioner. The compressor running speed of the fixed frequency air conditioner is constant, and the compressor running speed of the inverter air conditioner can be adjusted and changed. When the indoor temperature reaches the set temperature, the compressor of the fixed-frequency air conditioner will stop running, and the inverter compressor used in the inverter air conditioner can reduce the speed operation and realize the non-stop operation.
Many people think that inverter air conditioners are more energy-efficient than fixed-frequency air conditioners. In fact, the energy-saving advantages of inverter air conditioners need to be used for a long time. The more important advantage is that they are more comfortable to use and there will be no changes in cold and heat. People with sensitive temperatures are very important.
Although the price of fixed-frequency air conditioners is cheaper, whether it is from the perspective of comfort or environmental protection (many refrigerants for fixed-frequency air conditioners or R22, one of Freon), it is not recommended to buy, and in recent years, inverter air conditioners have become popular. The price is also generally affordable, and it is recommended to use inverter air conditioner as the first choice.
Which is the first-level energy efficiency and the third-level energy efficiency?
After figuring out the difference between fixed frequency and frequency conversion, there is still a very important parameter indicator - energy efficiency standard, the standard adopted by fixed frequency air conditioner and inverter air conditioner is different.
At present, the standard adopted by fixed-frequency air conditioners is “GB 12021.3-2010 Room Air Conditioner Energy Efficiency Limit Value and Energy Efficiency Ratingâ€. The energy efficiency rating is determined by the energy efficiency ratio EER. The energy efficiency ratio EER=cooling capacity/cooling power reflects the air conditioning refrigeration. effectiveness.
Inverter air conditioner level energy efficiency label
The standard adopted by the inverter air conditioner is "GB 21455-2013 speed controllable room air conditioner energy efficiency limit value and energy efficiency rating", and the energy efficiency ratio is determined by the annual energy consumption efficiency (APF). Compared with the above EER standard for fixed-frequency air conditioners, or the SEER standard used for pre-converter air conditioners (cooling season energy consumption efficiency), APF considers the annual energy consumption rate, which can be reflected in both cooling and heating efficiency. It is very important for heating areas.
Since we recommend the inverter air conditioner above, the key point to look at is the APF. According to the value, the energy efficiency rating is divided into 3 levels, of which the level 1 energy efficiency level is the highest.
The higher the energy efficiency level, the more energy-efficient the air conditioner will be, but as mentioned above, the use of inverter air conditioner is considered from the comfort point of view rather than to save electricity. The most important factor of the first-class energy-efficient air conditioner is to improve the comfort of use, which is more Ample use of materials.
According to the dismantling experience of the disassemble "Charm Blue Heart", most of the first-class energy-efficient air conditioner compressors, indoor unit fans and outdoor unit fans are all DC-converted, and equipped with electronic expansion valves, and three-stage energy-efficient air conditioners may Only the compressor is DC frequency conversion, there will be some reduction on some core components, some people call it pseudo DC frequency conversion, the overall performance is weaker than the full DC frequency conversion, so it is not recommended to buy, the conditions allow to directly buy the first-class energy efficiency model.
The energy efficiency label of the air conditioner will be posted on the indoor unit in a more conspicuous position. It is well recognized when purchased offline. If it is purchased on the e-commerce platform, the first-class energy-efficient model will generally be marked in a conspicuous position, while the third-level energy-efficient machine will be marked. Types are more "low-key", but they are also clearly marked on the product parameter page of the page.
What is the meaning of "number of horses"?
The above two key words "frequency conversion" and "first-level energy efficiency" are clarified, and it is necessary to find out exactly what "pi" is.
"Pic" represents a power unit, which is used here to indicate the amount of air conditioning refrigeration, reflecting the cooling capacity of an air conditioner. The cooling capacity of an air conditioner is about 2500W. Common air conditioning horses have small 1P, 1P, large 1P, 1.5P and large 1.5P and 2P, etc., mainly used in the bedroom environment, the living room air conditioning has a large number of 2P, large 3P and large 5P.
The next thing to do is to determine the size of the number of horses according to the area of ​​use. There are some differences in the conversion tables given by different manufacturers. It seems that there are many specifications, but as far as we recommend the first class energy efficiency inverter models, the wall-mounted models are mainly Focusing on the size of the big 1 and 1.5, it is still relatively easy to choose.
In addition to this, it is also necessary to combine the actual use environment. If it is a west room or a top floor, it is necessary to select a slightly larger air conditioner.
What kind of refrigerant is good?
At present, the commonly used refrigerants for air conditioners include R22, R410A, R290, R32, etc. Before evaluating them, it is necessary to clarify the two concepts of ODP and GWP.
ODP (Ozone Depletion Potential) is used to examine the extent to which a substance's gas is released into the atmosphere and has a potential impact on ozone destruction. The ozone destruction effect of the refrigerant R11 is defined as a reference, and the ODP value of R11 is taken as 1, and the ODP of the other substance is a comparison value with respect to R11. The smaller the value, the better the environmental characteristics thereof.
GWP (Global Warming Potential) is an index of the greenhouse effect of a substance. The GWP is within the 100-year time frame, and the greenhouse effect of the refrigerant corresponds to the mass of the same effect of carbon dioxide. Carbon dioxide is used as a reference gas because of its impact on global warming.
At the beginning we said that some low-end fixed-frequency air conditioners also use R22 refrigerant, because the damage to the ozone layer has gradually been eliminated by the market.
R410A is a refrigerant that replaces R22. Although this refrigerant does not destroy the ozone layer, GWP is even higher than R22. It promotes global warming and is not an ideal choice. It can only be regarded as transitional. alternatives.
At present, R32 refrigerant is gradually replacing R410A refrigerant. GWP is only 40% of R22. From the perspective of environmental protection, it is recommended to choose R32 refrigerant. R290 refrigerant has not been fully developed.
According to GB/T 7778-2017, based on flammability and toxicity, the refrigerant is divided into 8 safety classifications, namely A1, A2L, A2, A3, B1, B2L, B2, B3 (safety decreasing order). R290 and R32 are flammable in the four refrigerants, but don't worry too much. As long as the installation process follows the specifications, it will not pose a safety threat.
Are these functions useful in addition to formaldehyde/self-cleaning?
The air conditioner's job is to adjust the indoor temperature, but with the deep attention of the indoor air environment, the air conditioner has added some auxiliary functions to improve the indoor air quality, such as removing PM2.5 and removing formaldehyde.
Air conditioning in addition to PM2.5 principle
Air conditioner removal of PM2.5 is either achieved through the IFD dust collection module or by adding a small HEPA filter, which is limited by the airframe structure of the air conditioner. In either case, the final purification capability is very limited, and the HEPA filter is added. It will also have a certain impact on the air inlet and outlet of the air conditioner. It is relatively troublesome to replace the HEPA filter in the later stage, and it cannot be the reason for purchasing the product. It is better to buy an air purifier separately.
In addition to the unsatisfactory effect of PM2.5, according to the sampling inspection of 15 products of 8 brands by Shanghai Quality and Technical Supervision Bureau last year, 13 kinds of air-conditioner formaldehyde purification efficiency with formaldehyde removal function are not in compliance with relevant standards. The pass rate is 100%, and it is not realistic to put formaldehyde in the air conditioner.
Self-cleaning air conditioning works
Then there is the self-cleaning function, which cleans the dust by generating frost or a large amount of condensed water generated on the surface of the air conditioner heat exchanger, and more and more air conditioners have this function. But you must know that self-cleaning does not mean that it does not need to be cleaned. The outermost filter screen should be cleaned on time, and automatic cleaning can reduce the adhesion and mildew of dust, but it can not reach the degree of thorough cleaning, such as cross flow. The fan is difficult to clean.
The above are some problems that will be encountered when purchasing an air conditioner. Since the replacement cycle after the purchase of the air conditioner is relatively long, more homework is required during the purchase, and it will naturally be more comfortable and worry-free after use. Another point to note is that you must not be cheap, some air conditioning parameters are very beautiful, but there may be shrinkage inside, resulting in a great discount on the experience, the principle of a penny is always right.
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