reblog

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).

Refrigerants are also called refrigeration working fluids, commonly known as refrigerants in some areas in the south. It is a working substance that continuously circulates in the refrigeration system and realizes refrigeration through its own state changes. The refrigerant absorbs the heat of the cooling medium (water or air, etc.) in the evaporator to vaporize, and transfers the heat to the surrounding air or water in the condenser to condense.

In gas compression refrigerators, gas refrigerants such as air, hydrogen, helium, etc. are used. These gases are always gaseous in the refrigeration cycle; in absorption refrigerators, a binary composition composed of absorbent and refrigerant is used. Solution is used as working fluid, such as ammonia and water, silver bromide and water, etc.; steam jet refrigerator uses water as refrigerant. The main technical indicators of refrigerants include saturated vapor pressure, specific heat, viscosity, thermal conductivity, surface tension, etc. After 1960, people have conducted a large number of experimental studies on the application of non-azeotropic mixtures, and they have been used in the liquefaction and separation of natural gas. The application of single-stage compression of non-azeotropic mixed working fluid can obtain very low evaporation temperature, and can increase refrigeration capacity and reduce power consumption. Its nature is directly related to the refrigeration effect, economy, safety and operation management of the refrigeration device.

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).