Central air-conditioning has a high-end appearance, excellent performance, and can save family space. In recent years, the market has developed very well. A large number of consumers have followed suit, which has led to many unsatisfactory voices. Let's look at a few Case, to understand what kind of family is suitable for central air conditioning.
Case 1: Mr. Li, coordinates Xi'an, large size (135m2)
Mr. Li’s home is a 16-year-old central air conditioner. Because it is a large-sized apartment, it is recommended to install central air-conditioning during renovation. Only one external unit can control the temperature of each room, so it is installed, and the appearance and use are all aspects. Very satisfied, because Mr. Li’s home use rate is relatively high, and the electricity bill does save a lot compared to the split type.
There was a small episode in the middle, which was a malfunction of the external machine, which caused the air conditioner of the whole house to be unusable. This is also a shortcoming of the central air conditioner. The maintenance period is rather embarrassing, but the overall is satisfactory.
Case 2: Mr. Zhang, coordinates Taiyuan, small size (75m2)
Mr. Zhang’s home improvement central air-conditioning was a follow-up purchase. At that time, it was said that the central air-conditioning was high. After a period of consideration, it was installed. However, because the frequency of air conditioning used by Mr. Zhang’s home is not particularly high, some rooms may not open for a long time. I can't save much electricity, but it costs a lot of money to install air conditioners. It doesn't feel worthwhile.
In addition, because the central air-conditioning layer is also low, it is not very satisfactory.
Case 3: Ms. Li, coordinates Beijing, small unit (70m2)
Ms. Li has a small-sized house in Beijing. She also installed central air-conditioning. She also knew that the small apartment may not be suitable for central air-conditioning before the installation, but she finally installed it because she calculated the account for herself. The price of a square meter is about 100,000 yuan. If a cabinet machine is installed, it will take up more than half a square meter. This half-square meter of money is more than enough for central air-conditioning. The first wall-mounted hair dryer is not good, the whole room temperature is not good. Balanced, it is easier to get air-conditioning disease, and secondly it looks bad.
Therefore, the central air conditioner is installed, the appearance is beautiful, the space is saved, and the effect of cooling and heating is also good.
I have to say that Ms. Li’s way of calculating the account is very unique, but it does make a lot of sense. In the lot of land, the space is small, and it’s a waste of space to put the cabinet air conditioner, and the central air conditioner The principle of hair blowing is more in line with human comfort.
After communicating with these owners, it is basically possible to sum up a few lines for judging whether or not to install central air conditioning:
1. Type of apartment:
Large-sized units, duplex units, penthouses, and villas are the most suitable for installing central air conditioners. Of course, if you are a small apartment with a size of gold, you can install them.
2, the aspect of the layer:
The height of the floor should not be too low, because the central air conditioner will occupy a floor height of 25-30 cm, and the house height of the floor height of more than 2.7 m will not have much impact. Of course, if you do not mind the height of the floor, the level of the family can also Load
3. Space and aesthetics:
Recommended installations with high aesthetics and space requirements, high appearance and space saving are two major advantages of central air conditioning;
4. Comfort:
For the recommended installation with high comfort requirements, the central air-conditioning air circulation is more complete, the temperature is more uniform, and it is more suitable for human comfort;
5. Price:
If the budget is low, it is more concerned about the price and the frequency of use is lower. It is not recommended because the central air-conditioning cost is relatively high, and it takes a long time to use the split type to return to the original.
The price of central air conditioners will be a premium, but the average life of cabinets and hooks is generally 8-10 years, while the life of central air conditioners is generally 15-20 years, almost twice the size of the split type. The more and the larger the area, the more worthwhile to purchase central air conditioning.
Because central air-conditioning is much better than split-type air-conditioning, the small-sized friends can use the back-and-forth use. If you have a small size but high frequency of use, it is recommended to buy.
In-vehicle Ethernet
The traditional Ethernet protocol uses carrier monitoring multiple access and conflict detection technology. Therefore, the real-time requirements of the vehicle-mounted network are not met in terms of packet delay, sequencing and reliability. Therefore, the common vehicle-mounted local area network is still a real-time fieldbus protocol based on CAN. However, with the explosive development of automotive electronics technology, the number of ECUs continues to grow, and audio-visual entertainment signals are also incorporated into in-vehicle communication, which makes the traditional high-real-time, low-bandwidth vehicle bus unsuitable for the development trend of automotive electronics.
The International Institute of Electrical and Electronic Engineers (IEEE) approved the first automotive Ethernet standard "100BASE-T1" in 2016 after long-term research. It is based on Broadcom's BroadR.Reach solution and uses a single pair of unshielded twisted pairs at the physical layer. Wire and cable, using a more optimized scrambling algorithm to reduce signal correlation and increase real-time performance, which can provide 100Mbps high real-time bandwidth in the car.
The communication quality of high-speed Ethernet in the environment of automobile interference is an issue that needs to be examined. Especially for the 100BASE.T1 network, unshielded cables are used, which are more susceptible to current surges and electromagnetic interference, resulting in unstable performance and even functional failure. At present, there is a conformance test method based on the Ethernet physical layer, which is used to test the return loss, timing jitter, and maximum output drop of signal transmission equipment; the RFC2544 standard provides Ethernet delay, throughput, and packet loss rate. Test methods for performance indicators; but these common methods are based on traditional Ethernet, do not support 100BASE-TI automotive Ethernet, and do not take into account the interference characteristics of the automotive environment.
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