What is the air conditioning refrigerant? The working principle of air conditioning refrigerant

When the cooling effect of air conditioner is not good, sometimes it is caused by insufficient air conditioner refrigerant, and air conditioner refrigerant needs to be added. So what is the air conditioning refrigerant? What is the working principle of air conditioning refrigerant? In this issue, the editor will introduce air-conditioning refrigerants and their working principles. Refrigerant, also known as refrigeration working fluid, is the working medium of the refrigeration cycle. It uses the phase change of the refrigerant to transfer heat, that is, the refrigerant absorbs heat when it vaporizes in the evaporator and releases heat when it condenses in the condenser.

1. Operating principle

When the air conditioner is in refrigeration operation, the low-temperature and low-pressure refrigerant gas is sucked in by the compressor and then pressurized to become high-temperature and high-pressure Refrigerant gas, high-temperature and high-pressure refrigerant gas passes through the condenser (generally air-cooled, that is, the heat dissipation copper pipe of the outdoor unit) radiates heat in the outdoor heat exchanger, and becomes a medium-temperature and high-pressure liquid (the heat passes through the outdoor circulating air Go), the medium-temperature and high-pressure liquid becomes low-temperature and low-pressure liquid after capillary expansion and pressure reduction. The low-temperature and low-pressure liquid refrigerant passes through the evaporator (indoor unit copper pipe) to absorb heat and evaporates and becomes a low-temperature and low-pressure gas (indoor air passes through The surface of the heat exchanger is cooled down to achieve the purpose of lowering the indoor temperature), and the low-temperature and low-pressure refrigerant gas is sucked in by the compressor, and so on. Air-conditioning refrigerants Air-conditioning refrigerants In general, air-conditioning refrigerants in the air-conditioning system are a cycle of compression-condensation-expansion-evaporation.

Two. Addition method

Under normal temperature and pressure, R410A is a non-azeotropic mixture of fluoroalkane without chlorine. The color gas is stored in a steel cylinder. Combining the characteristics of R410a[1], the application practice of using R410a to replace HCFC22 in a certain room air conditioner system was carried out, and the theoretical analysis and system matching were carried out. The experimental results show that under the same conditions Compared with HCFC22, the heat transfer coefficient is improved and the flow resistance is reduced. After the system is optimized and matched, the performance (COP) is greatly improved, reaching the A-level energy efficiency level in the European market.

Generally, we may use low pressure refilling and static refilling.

1. The air conditioner is turned on for refrigeration and then weeping from the low pressure. When added to 0.35~0.55Mpa is enough, and then observe the cooling effect of the air conditioner. If possible, the measured high pressure cannot exceed 2.2Mpa.

2. When the air conditioner is disabled, add fluoride from the fluoride point. It is appropriate when the system pressure reaches 0.8~0.9Mpa

3. Let the air conditioner run for 30 minutes and do a careful inspection.

4. The correct method of refilling is to take your time when refilling. After adding a little bit, let the air conditioner run for about 10 minutes, and then measure the pressure and current. The pressure and current are used as the standard. In that case, it may have been increased. When adding fluoride in winter, the four-way valve coil can be disconnected, or the indoor temperature sensor can be artificially brought to a temperature that can be cooled. Sometimes the air conditioner can also be operated in dehumidification mode, which does not require very high temperature.

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