Write in front:
This article is the original manuscript of Cheze, please indicate the source "Cheze" for reprinting, and do not infringe.
According to the Hubei epidemic report on February 5th, Jiang Rongmeng, a member of the National Health Commission expert group, reminded that the virus can survive for up to five days even if it falls on a smooth solid surface.
For the sake of livelihood, many people start to drive back to the city or prepare to drive to and from work these days. However, at present, there is no example in the automobile industry that production cars rely on automobile software and hardware to prevent viruses. Therefore, when we choose a private car to travel, we should not only do a good job in personal protection, but also do a good job in vehicle disinfection protection. Wear a mask for yourself and a mask for the car.
To put it simply, in-vehicle epidemic prevention should pay attention to the following points:
1. Ventilation outside the vehicle
Under normal circumstances, in an open place, windows can be opened for ventilation. In closed environments such as underground parking lots, it is suggested that car owners close windows and use air conditioners for circulating ventilation.
Friendly reminder: During the epidemic, start the vehicle every 5 days and idle for 20 minutes to keep the battery healthy. Secondly, open the window and ventilate for a period of time to prevent electronic components from getting wet.
2, disinfection in the car: do not spray, just wipe.
Necessary disinfectants, masks and other disinfection or protective articles in the car. Owners or passengers should first clean and disinfect their hands after entering public places and returning to their cars. After getting on the bus (unknown physical condition), open the window for ventilation in time and wipe the car with effective disinfectant or disinfectant wipes.
Wipe the inside of the car with chlorine-containing disinfectant, chlorine dioxide disinfectant or disinfectant wipes, while keeping the door open or the window ventilated. It is recommended to choose iodophor, chlorine-containing disinfectant and hydrogen peroxide disinfectant for hands and skin.
It should be noted that the main components of medical alcohol currently used for disinfection are ethanol and water. The flash point of ethanol is 12.78℃, and the fire risk belongs to Class A. The flash point of 75% ethanol disinfectant is about 22℃, and the fire risk belongs to Class A. ..
So don't disinfect with spray alcohol! Spray disinfection is prohibited indoors. Wipe disinfection should be adopted, and leakage should be avoided during disinfection. If the alcohol concentration in the enclosed space exceeds 3%, the static electricity will detonate.
The car itself is prone to static electricity (seat, steering wheel, hair, metal, etc. ), and there are many electronic devices in the car, such as cigarette lighters and charging ports. Once the alcohol concentration exceeds 3%, the consequences are unimaginable.
In addition, if spraying disinfection is used outside the car, open flames must also be prohibited to prevent the local spraying concentration from being too high, which may easily lead to the risk of burns when exposed to open flames. Don't spray alcohol on your body, and smokers should stay away from alcohol.
3. Configure the mask for the car.
According to the COVID-19 Protection Guide officially issued by China CDC, aerosol transmission is another possible route besides droplet transmission and contact transmission, and COVID-19 can be absorbed by various smog and dust particles and spread with the airflow.
For cars, the air conditioning filter is the mask of the car! The primary function of air conditioning filter element is to filter pollen, dust, water mist, carbon oxides, sulfides and so on. In the air, so as to ensure the cleanliness of the automobile air conditioning system and provide fresh air for the people in the car.
If the vehicle's air-conditioning filter element is not replaced in time, dust will enter the air-conditioning system, deposit dirt and block the pipeline and air outlet, making the air-conditioning filter element a pollution source, causing the dust to enter the evaporator and air duct, forming an odor that is difficult to remove or even mildew, and breeding bacteria and viruses.
For example, the average diameter of coronavirus is only 0. 125um. ? It should be noted that viruses basically adhere to dust, blood, saliva and other media.
These particles include:
a.？ In a slow-moving airflow, very large particles (
b.？ Inhalable particles larger than 0.6μm in diameter are usually intercepted or effectively captured by inertial collision.
c.？ Particles smaller than 0. 1 μ m will collide with the random motion of air molecules and float in the air, which is very dangerous.
From the perspective of cost control, the filter element of the original car does not occupy a high position in a car, and the price and quality are generally low, and the filtering ability of fine particles is limited, which is likely to give the virus an opportunity.
At present, air conditioning filter elements are mainly divided into three categories: ordinary filter paper (non-woven fabric) air conditioning filter elements, activated carbon air conditioning filter elements and HEPA multi-effect air conditioning filter elements.
Taking masks as an analogy, non-woven air conditioning filter is equivalent to disposable masks, activated carbon air conditioning filter is equivalent to medical surgical masks, and HEPA multi-effect air conditioning filter is equivalent to N95 masks.
In principle, the air conditioning filter element is actually to fold the filter paper to form a certain thickness and let the air pass through.
1. ordinary filter paper (non-woven fabric) air conditioning filter element. This filter element is only filtered by filter paper, which is made of fibers, including wood pulp paper (plant fiber), glass fiber paper (glass fiber), PP paper (polypropylene) and so on. However, if only filter paper is used, the filtration fineness is not high, the dust resistance is low and the purification effect is extremely limited.
2. Activated carbon filter element. Activated carbon filter core is based on fiber filter layer, adding activated carbon layer, upgrading single-effect filtration to double-effect filtration, and adsorbing some carbon oxides, sulfides, formaldehyde and so on. It can't be absorbed by non-woven air conditioner, but can absorb harmful gases such as toluene to realize double-effect filtration.
3.hepa multi-effect air conditioning filter. The filtration grade of ordinary air-conditioning filter elements for particulate matter is generally around PM 10, but the materials with diameters above 0.5 micron and below 0. 1 micron cannot be filtered. When you encounter this situation, you need a HEPA filter to filter.
Note: HEPA, is it high? Efficiency? Particles? The abbreviation of Air, which means "high efficiency air particle filtration system", was first used in the medical field.
This level of air-conditioning filter element adopts medical-grade HEPA meltblown layer, and an anti-mildew and anti-bacterial layer is added in view of the fact that air-conditioning filter element is prone to mildew after long-term use.
On the premise of air tightness, the multi-effect air conditioning filter element of medical-grade meltblown layer is enough to block the filtration of particulate matter including pollen, PM2.5 and most bacteria.
Although the particle size of COVID-19 is only 60-140 nm (0.06-0.14? M), but in fact, the spread of the virus mainly depends on droplets and droplet nuclei as carriers (droplet diameter is generally greater than 5? M, and the droplet core is less than or equal to 5? M, generally greater than 1? M), floating aimlessly in the air, the filter element of HEPA air conditioner is enough to stop it. It's equivalent to putting an N95 mask on your car.
Common suppliers of air-conditioning filter elements are: Hangster, Bosch, Mann brand, 3M, Mahler, Sofmar, FRAM, etc. The original air-conditioning filter elements of automobiles are also from these OEMs. The author sincerely believes that we can now choose some higher-end brands to do filtering protection. After all, big brands are guaranteed in technology and quality.
Even if the suppliers are the same, we can choose higher-level products of this brand to achieve better filtering effect.
Masks are sky-high these days. Car owners who make a living by driving can really try to change the air conditioning filter.
Because no one knows whether the filter element of automobile air conditioner will become a financial product after masks, goggles, gloves and disinfectant.
5, in order to prevent cross infection in the car, you must also wear a mask.
Internal circulation can effectively purify the air inside the vehicle when the vehicle is stationary, but the harmful gas inside the vehicle cannot be discharged outside the vehicle. When the vehicle is running, the ability of air conditioning system to protect the air inside the vehicle will be weakened.
When there are smog, harmful gases and even viruses in the outside air, the passenger compartment of the vehicle is not absolutely safe. Wear a mask and take epidemic prevention measures.
The winter will always pass, protect yourself, and see you next sunny day!
Some pictures in this article come from the Internet. If there is any infringement, please contact Cheze customer service and delete it immediately.
This article comes from car home, the author of the car manufacturer, and does not represent car home's position.