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What are the advantages and disadvantages of central air conditioning?

What are the advantages and disadvantages of central air conditioning? 1. It is better to use a central air conditioner ① Split machine and multi-connection Before chatting, first understand the two basic concepts of air conditioning, split machine and multi-line. The split machine is our common common air conditioner. There are wall-mounted and cabinet-type units, which are composed of an internal unit and an external unit. If there are many rooms and each room is equipped with an air conditioner (internal unit), many external units may be hung on the external wall of the building. One requires a lot of space, and the other is that the noise will be relatively loud. Multi-connection is what we call a central air conditioner. One external unit can be connected to multiple internal units. One external unit with two internal units is called "one-to-two", even three is called "one-to-three", and so on . The structure of the multi-connection is more complicated than the split machine, and the cost is higher. With the same cooling capacity, the overall price of the multi-connection is higher than that of the split machine. The air duct machine is an air conditioner between the split machine and the multi-line, which can be understood as one for one, and the price is cheaper than the central air conditioner. The advantage of central air conditioning is that the internal unit is generally installed in the ceiling and does not occupy floor space; while the external unit usually only needs one outdoor air conditioning space. The internal unit has air outlets and return air outlets, so the air volume can be controlled gently and softly. The cold air is no longer "jetted" to the human body, which can alleviate the sudden temperature drop and cause physical discomfort. This air outlet method also determines The air outlet noise is relatively small. On the whole, the central air conditioner is more suitable for a house with a relatively large area, a large number of rooms, long-term temperature control in the room, and a room height that is not too low (a hidden ceiling that requires a ceiling of about 30cm). The internal machine of the air duct machine is also hidden in the ceiling. If the budget is limited and you want to save space, you can also consider the "living room air duct machine + bedroom wall hanger" program. . ②Heating function The acceptance of central air conditioning in the southern region is higher than that in the north. It is also because the central air conditioning has a certain heating function, and most central heating districts in the north do not need this care. Air conditioner heating uses the refrigerant (fluorine) to transport the outdoor heat to the room. When the outdoor temperature is too low, the ability of the refrigerant to evaporate and absorb heat will decrease. In order to maintain the indoor temperature, the compressor will have to work hard and the motor will wear out. , Shortened life, and cost electricity. However, the temperature in the south is relatively mild in winter. A compressor with better performance and high-quality refrigerant can meet the heating needs. 2. How to choose a central air conditioner ① Compressor-the core component It is the compressor that affects the cooling performance of the air conditioner, which is equivalent to the "heart" of the air conditioner. There are three types of compressors, reciprocating, rotor, and scroll. In the case of the same brand and the same power of the central air conditioner, the scroll type is more expensive than the rotor type, and the rotor type is more expensive than the reciprocating type. ②Power The power of the air conditioner is generally called "horse". One horse corresponds to a cooling capacity of 2500W, and the temperature control area is about 12 square meters. Families with three rooms and one hall need to drag four to six horses. If you want to drag five or more internal planes, you need a larger number of horses. As long as the number of external machines is large enough, any number of internal machines can be dragged. ③ Frequency conversion technology Frequency conversion is to let the air conditioner work at different frequencies, the main benefit is to save electricity. Divided into DC frequency conversion and AC frequency conversion. DC frequency conversion motors have lower energy consumption and higher cost than AC frequency conversion motors. It is reflected in air conditioning that frequency conversion is more expensive than non-frequency conversion, and DC frequency conversion is more expensive than AC frequency conversion. ④Refrigerant Freon mostly uses Freon. When it comes to Freon, it will think of destroying the environment. In fact, Freon is a brand registered by DuPont in the United States. The refrigerant that destroys the ozone layer is Freon R22. Now it is gradually replaced by Freon R410A. ⑤ Brand Domestic brands mainly include Gree, Midea, Haier, and imported brands mainly include Daikin, Mitsubishi Electric, Mitsubishi Heavy Industries, Hitachi and so on. The level of pure technology alone, the level of domestic air-conditioning manufacturers are between Bozhong. Foreign countries have their own advantages, such as the originator of Toshiba frequency conversion, Hitachi vortex technology is advanced, and Mitsubishi quality is solid. Daikin entered the Chinese market relatively early, and it has built a good reputation for many years. The frequency conversion technology of central air conditioning is mature (that is, Daikin's so-called VRV technology), which can flexibly control the temperature of different internal units. Mitsubishi Electric has three main series, Lingshang, Lingyao and Bingyan. Lingshang is suitable for small units; Lingyao uses divergent boxes to reduce the welding points of the pipeline, which is equivalent to reducing the failure points; ice flame heating is stronger. Mitsubishi Heavy Industries mainly has two series of SCM and KXZmini, SCM specializes in small units of 80 to 100 square meters; KXZmini is relatively expensive, and focuses on the customization of the entire house. For example, many rooms and complex units can be designed. ⑥Price reference Take the example of a three-bedroom, one-living room, buying 6 central air conditioners for four, the price of domestic brands is around 25,000, and imported brands are about 50% more than this. 3. Installation and maintenance of central air conditioner In the air-conditioning industry, and even the entire decoration industry, there is a well-known saying: three-point products and seven-point installation. That is to say, whether the air conditioner is good or not is not the only factor that affects your final temperature control effect. If the excellent air conditioner is not installed well, there will also be problems with poor cooling effect, high noise, water leakage and even affecting the service life. ①Installation steps Because it involves ceiling and pipeline layout, the installation of central air conditioning is much more difficult than ordinary air conditioning. At the beginning of the decoration, usually on the day when the water and electricity confiscated, the person who installed the central air conditioner should negotiate with the foreman, the master of water and electricity and the designer to discuss the installation plan. After negotiation, in accordance with the principle of "small pipes allow large pipes", the central air conditioner should be installed first (if there is fresh air, fresh air is installed first. The general fresh air duct will be thicker than the central air conditioner) Set the power supply position, and then install the water and electricity pipelines. ▲Internal machine and pipeline of central air conditioner The internal machine should be hoisted first. The position of the internal machine should be considered to shorten the distance of the pipeline as much as possible. The longer the distance the refrigerant flows in the pipeline, the greater the loss; there should be a short distance between the internal machine and the roof to avoid the internal machine. Resonate with the roof during work, which will damage the body, and the noise is relatively large. After the internal machine has been hoisted, the pipelines will be laid out. The layout of the pipelines should be a drawing jointly decided by the central air-conditioning business, the electrician, and the designer. The pipeline is generally a copper pipe. Since the pressure of the refrigerant used is relatively large, the welding requirements of the copper pipe are relatively high (the internal machine with divergent boxes hardly needs welding). If the pipeline leaks, the compressor must work with more power , Intuitive feeling is that the air conditioner is very noisy when working. After the pipeline is laid, vacuum or high-pressure nitrogen must be flushed to check the welding quality of the pipeline. Install the outdoor unit after the pipeline is laid. The outdoor unit should be installed in a well-ventilated place, and there should be no obstructions for one meter around. The last is to install the air outlet, return air outlet and fluoride test. The location of the air outlet should avoid the bedside or the sofa, combined with the layout of the indoor furniture and the design of the light trough, to maximize the advantage of the soft air of the central air conditioner. The general air return method is "measure the next return", that is, the side air outlet and the bottom air return, the air outlet and the air outlet should not be too close, so as to avoid the phenomenon of "short circuit" in the air circuit. ▲Side out next time The air outlet is generally aluminum alloy louver, which is strong and durable, but the air outlet may drip, generally white, and it is usually white to add other colors. There are also ABS plastic or wooden air outlets, which are not easy to drip. The shape and color are more. Choose the ceiling style. In addition to the air outlet and return air outlet, remember to keep the maintenance port (the return air outlet is often used as a maintenance port, in the early design, remember not to close the return air outlet blocked by furniture such as a wardrobe), otherwise when maintenance is required, only The ceiling can be removed. ▲The return air vent is often used as a maintenance port Pay attention to asking whether the brand's installation team is professional and reliable. Most domestic mainstream brands are now outsourcing installations. You need to directly connect with the installation master to coordinate the relationship. Teams that are too unreliable sometimes have more tragic things, for example, the workers mistakenly mistake the position of the internal machine, and the 2 horse machine is installed at the position of 1.5 horses. At this time, the ceiling is often completed. Approach. You can only saw the ceiling down and take out the internal unit for replacement. When the internal unit was replaced, the entire liquid pipe was opened, and there was no pressure. The Freon vaporized and ran away. Therefore, after the internal unit was replaced, the external unit should be re-fluorinated. A pressure of ~90 yuan usually requires two pressures, and the imported fluorine is more expensive. ▲Fluorine addition There are also problems with the welding of the pipeline. It may not have been found in the pipeline test at that time, but after a while, the leakage of fluorine will occur after a while, and the cooling function will be damaged. There is even a mistake to install the outdoor unit of the air conditioner on the indoor balcony. ▲Welded copper tube ②Installation price The installation fee is generally included in the total price of the purchase of the central air conditioner, and the installation fee and accessories generally account for 20~30% of the total price If the installation is outsourced, the price varies from place to place. The installation fee for most of the home improvement central air conditioners is between 1400 and 1500 yuan. The tooling is different, according to the materials used for the copper pipe. If you install an air conditioner extension tube, the extension tube price is about 110 yuan per meter; if you want to buy a full set of air conditioner connection tubes, the price is 300 yuan per set; if you want to buy copper tubes directly, the copper tubes are sold by weight, the price is at 55 yuan per kilogram. Of course, the specific situation needs to be analyzed in detail, these are just references. ③Post-maintenance Simple cleaning of the tuyere can be done by yourself, as long as the power is turned off, the shutters are removed and cleaned. In-depth cleaning find after-sales or professional workers, about once a year, disassemble the machine to change the filter and refrigerant, and clean the inside of the machine. The charge is different for different numbers of horses, one for three or one for four is about five or six hundred each time. These cleanings can be operated at the access port. If the internal unit is replaced, or the copper pipe is welded, the ceiling must be removed.

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