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R12 and R22 cannot generally be substituted for each other. Commonly used refrigerants for refrigerators include R12, R134, R600, R152/R22. Commonly used refrigerants for azeotropic air conditioners include R22, and new refrigerants include R404 large-scale refrigeration equipment, for general use, ammonia, lithium bromide, liquid nitrogen, R22, R404, R407 , R23 is used for individual thermal shock boxes (rarely). General thermal shock boxes are used. R22 and R404 refrigerator repairs can be replaced by R12 instead of R134 and R600a systems. The main difference is the difference between refrigerating oil.

According to the driving mode, it is divided into independent type (a dedicated engine drives the compressor, which has large cooling capacity and stable operation, but high cost, large volume and weight, mostly used in large and medium-sized passenger cars) and non-independent type (air-conditioning compressor is provided by the car) Driven by the engine, the cooling performance is greatly affected by the work of the engine, and the stability is poor. It is mostly used in small passenger cars and cars).
According to air-conditioning performance, it is divided into: single-function type (install cooling, heating, and ventilation systems separately, operate separately, without interference, and mostly used in large passenger cars and trucks) and integrated cooling and heating (cooling, heating, and ventilation sharing blower and wind It can be controlled on the same control panel, and it can be divided into a combined type where the cold and warm air work separately and a mixed temperature adjustment type where the cold and warm air can work simultaneously.
According to the control mode, it is divided into manual type (toggle the function keys on the control panel to control the temperature, wind speed, and wind direction) and electronically controlled pneumatic adjustment (using the vacuum control mechanism, when the air conditioning function key is selected, it can be within the predetermined temperature Automatic control of temperature and air volume).

Throughout the year, we will use refrigerators, 12V portable refrigerator wholesale food makes our lives more convenient and comfortable. In order to not only ensure the freshness and taste of food, but also protect the refrigerator body, we need to master the appropriate refrigerator temperature and adjust the refrigerator temperature as the situation changes. Having a portable refrigerator makes it more convenient for people to buy.YT-B-65PX 52L/13L 58W Camping Portable Refrigerator
The portable refrigerator can carry 23.4 liters of liquid. The inner lining material of the handbag is completely waterproof, and other parts of the handbag are also water-resistant, so occasionally splashing water or bathing outside will not cause the ice in the handbag to melt.
It is reported that the portable refrigerator adopts a waterproof and sealed zipper structure, so even if the handbag is completely upside down, there will be no liquid leakage. In addition, the handbag is surrounded by a 2.5 cm thick insulating material layer, and the bottom insulating material layer is 3.8 cm thick. This ensures that even if the handbag is placed on the surface of a hot object, it will not cause the internal ice to melt.
The portable refrigerator adopts DC compressor for fast cooling speed, fluorine-free refrigerant, balanced operation, low noise, long service life, temperature setting display board with memory function, refrigerator circuit design adopts delayed start technology to ensure machine operation. The refrigerator adopts microcomputer processing, which can automatically check the fault and adjust according to the indicator light.
The price of a portable refrigerator generally fluctuates from several hundred to several thousand yuan. The temperature control knob of a refrigerator generally has levels 0, 1, 2, 3, 4, 5, 6, and 7. The larger the number, the lower the temperature in the freezer. Generally, we put it on the 3rd gear in spring and autumn, depending on your requirements, whether the freezer can reach minus 18 degrees. In order to achieve the purpose of food preservation and power saving, we can hit gear 2 or 3 in summer and gear 4 or 5 in winter.

Optimizing refrigerant charge has always been a key part of designing cooling systems and balancing their efficiency, reliability, performance, and cost. But recently, that balance has shifted, and refrigeration engineers are once again looking at refrigerant as a key piece of the puzzle.

There are two main reasons for this.

First, refrigerant prices are rapidly increasing in certain parts of the world. This is largely driven by dwindling supplies as traditional options are phased down under European F-Gas regulations, and other measures to limit the production of greenhouse gases under the Kyoto, Montreal, and Kigali protocols.

As a result, some refrigerants — such as R-404A — have risen in price by more than 500 percent in Europe since 2017.

Where once refrigerant may have been a relatively minor cost compared to a system’s components, now the charge has a far larger impact on its overall production and installation price – making every saving valuable.

Second, the move to reduce GWP has resulted in the growing use of flammable alternatives. In such cases, having less refrigerant charge materially increases the number of applications where a system can legally and safely be used.

So, in the current climate, reducing refrigerant charge is a key part of gaining competitive advantage — for manufacturers and installers alike — satisfying end users, and maintaining profitability.

R-134a refrigerant, alias R134a, HFC134a, HFC-134a, tetrafluoroethane, Chinese name tetrafluoroethane, English name 1,1,1,2-tetrafluoroethane, chemical name 1,1,1,2 tetrafluoroethane Ethane, the molecular formula CH2FCF3. Because R-134a belongs to HFC substances (non-ODS substances Ozone-depleting Substances)-it does not destroy the ozone layer at all. It is an environmentally friendly refrigerant recognized and recommended by most countries in the world. It is also the mainstream environmentally friendly refrigerant. It is used for the initial installation of new refrigeration and air-conditioning equipment and the addition during the maintenance process.

The main purpose:

R-134a is the most widely used medium and low temperature environmentally friendly refrigerant. Due to the good comprehensive performance of HFC-134a, it becomes a very effective and safe alternative to CFC-12. It is mainly used in the use of R-12 (R12). , Freon 12, F-12, CFC-12, Freon 12, dichlorodifluoromethane) refrigerants in most areas, including: refrigerators, freezers, water dispensers, automobile air conditioners, air conditioners, dehumidifiers, cold storage, commercial refrigeration, ice It can also be used in refrigeration equipment such as water machine, ice cream machine, freezing and condensing unit, and can also be used in aerosol propellant, medical aerosol, insecticide propellant, polymer (plastic) physical foaming agent, and magnesium alloy protective gas Wait.

Although R134a refrigerant is the most common choice for replacing Freon R12 on newly installed refrigeration equipment, the physical and chemical properties, theoretical cycle performance, and compressor oil of R134a and R12 are different, so the refrigeration equipment initially installed as R12 refrigerant After-sales maintenance, if you need to add or replace the refrigerant, you still can only add R12, usually R134a can not be directly replaced by R12 (that is, usually cannot be replaced by blood replacement).

Because R22 and R410A have different compositions and pressures, R410A needs to be filled in liquid, and the thickness of the copper tube of the machine is also different, so it is forbidden to mix the two refrigerants. Maintenance measuring instruments and quantitative refrigerant charging equipment should also be dedicated.

According to the air-conditioning installation or maintenance process (national standard or industry-related standard): when the connecting pipe between indoor and outdoor units of air-conditioning installation exceeds the standard length by more than 5 meters, the refrigerant should be refilled in time. The operation effect is not good.

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R410A is a HFCs refrigerant mixed with two working fluids of R32 and R125 at a mass fraction of 1:1. Compared with R22, the condensation pressure of R410A is about 1.6 times that of R22. It is a high-pressure refrigerant and needs to improve the pressure resistance of the system. Compared with R410A, the saturation pressure of R32 refrigerant is about 2.5% higher.

Ten prohibitions on installation and maintenance of flammable refrigerant air-conditioning

1. It is strictly forbidden to engage in special operations without qualification certificates;

2. It is strictly forbidden to work at altitudes above 2m without wearing a safety belt or a safety rope;

3. It is strictly forbidden to smoke at the installation and maintenance site, and there should be no fire or high temperature heat source within two meters;

4. It is strictly prohibited to install without vacuuming or the vacuuming time is less than the specification requirements;

5. It is strictly forbidden to replace nitrogen with oxygen to maintain system pressure;

6. It is strictly forbidden to start and run the outdoor unilateral machine;

7. It is strictly forbidden to conduct welding repairs and use open flames or pipes with refrigerant in the welding system in the user's home;

8. It is strictly forbidden to recover the refrigerant under the negative pressure of the system, and the recovery time shall not exceed 1 minute;

9. It is strictly forbidden to use fake refrigerants, inferior refrigerants and different types of refrigerants to mix or substitute;

10. It is strictly forbidden to detect the system pressure in the startup state. In the standby state, the detection system pressure range is normal, and it can be powered on when there is no negative pressure.