The meaning of various parameters at the product model description on the refrigerator
Product model description mainly includes refrigerator volume, product climate type, freezer star rating, power consumption, energy efficiency rating, refrigerant, external dimensions and other parameters. Here are a few of the more important parameters.
1. The total effective volume of the refrigerator. It refers to the total effective volume of food for storage in the refrigerator, freezer (including ice making room, vegetable storage room, etc.) after the refrigerator is closed, and the unit is expressed by the English letter "L" (liter).
2. The type of climate in which the refrigerator is used. Since the main function of the refrigerator is refrigeration, the impact of different regional climates on the refrigeration capacity of the refrigerator is also different. See the table below (national standards):
Climate zone type letters indicate ambient temperature (°C)
Sub-tempering zone SN 10-32
Temperate N 16-32 Subtropical ST 18-38
Tropical T 18-43
3. The star symbol sign of the refrigerator freezer.
Star symbol freezer temperature (°C) approx. food time
One star* ≤-6 1 week
Two stars** ≤-12 1 month
Three stars *** ≤ -18 3 months
Four-star **** <-18 3-6 months
Note: The temperature of the four-star refrigerator is the same as that of the three-star refrigerator, and the fourth star is the frozen star, indicating that the refrigerator has the ability to freeze.
4. Refrigerant, also known as refrigerant, is the working medium for completing the work cycle in the refrigeration system. Some people call it "snow". At present, most countries in the world use the American Society of Heating, Refrigerating and Air-Conditioning Engineers' Standards to name refrigerants. The initial letter "R" of the English word refrigerant "Refrigerant" is used as the refrigerant code. For example: R600a
5. Other:
* Green products mainly refer to products that are environmentally friendly during production, use and disposal.
* "Fluorine-free" refrigerator in the green refrigerator series: the correct name should be called "CFC-free" refrigerator; it means that the refrigerator does not contain chlorofluorocarbons (CFCs), which have serious destructive power to the ozone layer, specifically That is, the refrigerant of the refrigerator does not use CFC12 (R12), and the foaming agent of the heat insulating layer of the tank does not use CFC11 (R11).
The meaning of the energy efficiency label
The energy efficiency label is a label attached to the energy-using product, highlighting the amount of energy consumption and the level of energy efficiency of the product. Consumers can get intuitive energy consumption information and estimate daily consumption costs when purchasing products with such logos to determine which models of the same type are more energy efficient and less expensive to use.
According to the latest standard of "Restriction of Household Refrigerator Power Consumption and Energy Efficiency Rating" issued by the state, the refrigerator is divided into five levels of 1, 2, 3, 4, and 5, among which:
Level 1 indicates that the product has reached the international advanced level and the most energy saving;
Level 2 indicates that the power is saved;
Level 3 indicates that the energy efficiency of the product is the average of the market;
Level 4 indicates that the product's energy efficiency is lower than the market average;
Level 5 indicates high energy consumption and is an indicator of market access. Products below this level are not allowed to be produced and sold.
These energy efficiency limit values ​​are mandatory for the state. The purpose is to eliminate inefficient and inferior energy-using products in the market. The energy-saving evaluation value is a recommended indicator. As an energy-saving target of enterprises, enterprises are encouraged to develop and produce energy-efficient products. In addition, it also intuitively reflects the energy efficiency rating of a certain refrigerator, even if you do not understand the consumer can understand at a glance.
Things to be aware of when the store actually purchases
First of all, we must look at the refrigerator cabinet and the door should be straight, the assembly should be firm, the door should not be skewed, the gap between the rotating shaft and the shaft pin is well matched, and the hand sensing is flexible when pushing the box door by hand. . The color of the surface coating (painting or dusting) of the refrigerator should be uniform and bright, and there should be no signs of pitting, rust, bruises or scratches. The plating parts of the refrigerator should be bright and fine, and there should be no plating falling off. At the contact points such as the door, the box and the door sill, the foaming liquid must not leak.
Visually check whether the door seal and the cabinet of the refrigerator are flat and tight. The knob of the temperature controller should be flexible. The defrosting button should be able to quickly spring back when released. In addition, you can check whether the accessories of the refrigerator are complete according to the instruction manual of the refrigerator.
In addition, we can check the cooling performance and electrical performance of the refrigerator. Turn the temperature controller inside the refrigerator to the “stop†position, turn on the power, and check the light switch and the light. When the door is opened, the light should be on and the door should be extinguished when it is nearly closed. Then adjust the temperature controller to the strong cold point, and the compressor of the refrigerator starts to run, and check whether the electrical components of the refrigerator are working properly.
Finally, when you are checking the refrigeration performance of the refrigerator, you can hear the slight sound of the compressor. The intercooled refrigerator can hear the weak and low fan sound when the fan rotates. When you touch the refrigerator by hand. When the box is in, there is a slight vibration feeling.
There is also radiation in the refrigerator
The refrigerator is also a high magnetic field
Many people like to put the refrigerator in the living room. In fact, this is very unscientific. The refrigerator is a high magnetic field when it works. If the refrigerator shares a socket with the TV, the electromagnetic wave will cause the image of the TV to be unstable when the refrigerator is running, which means that the electromagnetic wave of the refrigerator is very large. The release of electromagnetic waves of different wavelengths and frequencies forms an electron mist that affects the human nervous system and physiological functions. The electromagnetic wave has a strong penetrating power and can penetrate deep tissues and organs through the body surface. People usually do not pay attention to it. Once the surface tissue pain occurs, it indicates that the deep tissue or organ has been seriously damaged. According to experts, when the refrigerator is operating, the magnetic field released by the rear side or the lower heat pipe is the largest. In addition, too much dust in the heat pipe of the refrigerator will have an effect on electromagnetic radiation, and the more dust, the greater the electromagnetic radiation.
Solution: The refrigerator should be placed in a kitchen and other places where it does not stay often; try to avoid approaching it or storing food when the refrigerator is working; often use a vacuum cleaner to suck the dust off the heat pipe.
15-25mm Calcium Carbide: Physical and chemical properties: ores are solid brown or black block, pure white crystals (including CaC2 higher purple). Density of 2.22 g / cubic centimeter, the melting point of 2300 ° C (with CaC2 content), water immediately intense reaction to generate acetylene, and release heat, Calcium Carbide content varies with the melting point also will change.
Impurities: Caustic soda often contain calcium arsenide (Ca3As2), calcium phosphide (Ca3P2) and other impurities, and the role of water at the same time release arsine (AsH3), phosphine (PH3) and other toxic gases, so the use of Acetylene generated by calcium carbide is toxic.
Crystal structure
The most common crystal form of CaC2 is tetragonal, stable between 298K and 720K. Quartet CaC2 similar to the crystal structure of NaCl, but due to [: C≡C:] 2- ion oval, oriented, the crystal is tetragonal. In CaC2 crystal, the C-C distance is 120pm, which corresponds to the bond length of carbon-carbon triple bond, the distance between Ca and C is 259 and 282pm.
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