Why to vacuum cooling system? How big is the hidden trouble?

why emphasis on vacuum cooling system? We first look at the composition of air, as shown in the figure below: 78% of nitrogen in the air; Oxygen makes up about 21%; Other gases (1%). So we are now to the analysis, the gas composition in after entering the refrigeration system, what is the effect of the refrigerating system?

a, the influence of nitrogen on the refrigeration system

the first thing we want to know, nitrogen is no non-condensable gas. That means no non-condensable gas with gas refrigerant circulating in the system, not with refrigerants condensation, also don't have a cooling effect.

is not the presence of non-condensable gas has great harm to the refrigeration system, main show is in can make the system condensing pressure, condensing temperature, compressor exhaust temperature, increase power consumption. Nitrogen into the evaporator, and not as the refrigerant evaporation; Also will occupy the heat exchange area of the evaporator, the refrigerant is not fully evaporated, the refrigeration efficiency is lower; At the same time because of the exhaust temperature is too high may lead to lubricating oil carbonization, affect the lubrication effect, serious when burned refrigeration compressor motor.

2, the effect of oxygen on the refrigeration system

as oxygen and nitrogen are also belong to no non-condensable gas, we have analyzed above no non-condensable gas harm, we do not repeat here. But it is worth noting that, compared to the nitrogen oxygen if into the refrigeration system, and these hazards:

1, the oxygen in the air can produce chemical reaction and the refrigeration system of the frozen oil generating organic matter, after the formation of impurities, into the refrigeration system, as well as the dirty wall.

2, oxygen and refrigerant, water vapor prone to forming acid chemical reaction, make frozen oil oxidation, the acids can damage components of refrigeration system, violation of motor insulation. At the same time these acid product will always stay in the refrigeration system, without any problems at first, with the passage of time, after cause compressor damage. The following chart illustrates these problems very well.

three, other gases ( Water vapor) Impact on refrigeration system

affects the normal work of the cooling system, water vapor in the tiny freon dissolved in the liquid solution degree, and lower solubility decrease gradually with the temperature. Water vapor, the impact on the refrigeration system has the following three we use graphic way to explain:

1, there is a water cooling system, the influence of a is throttling structure, when water vapor into the throttle body temperature quickly reduce the water reach the freezing point, produce ice, blocked the throttling tiny hole structure, produce the ice wall failure.

2, corrosion pipeline water vapor into the refrigeration system, the system of the water content increases, the corrosion and clogging of pipe and equipment.

3, produce slag mud sediment. Water vapor in the process of compressor compression, meets the high temperature and frozen oil, refrigerant, organic matter, etc. , to produce a series of chemical reactions that result in impaired motor winding, metal corrosion and forming slag mud sediment. Water mark compressor copper cross rust

in addition, there are air conditioning is the use of R32, R290 refrigerants, the refrigerant flammable explosive, these devices must be vacuum, if R32, R290 directly exposed to the air ( Oxygen) , meet after high temperature, spark will be an explosion. Pumping air into vacuum state, R32, R290 can be cut off from the air, reduce the possibility of danger.

the place on put together is narrated, in order to guarantee the effect of refrigeration equipment, refrigeration equipment longevity and their own safety, normal operation Suggestions for vacuum refrigeration system.

4, operation method of vacuum cooling system

here it under vacuum method and process, due to the only air conditioning vacuum at the hands of the material, so the vacuum equipment in air conditioning, for example, in fact, other similar refrigeration equipment vacuum operation, the principle is the same.

at the same time from the air tube and tube vacuum

1, check vacuum pump seal rubber pad without damage before operation, and vacuum gauge pressure gauge to zero. To add fluoride tube, vacuum gauge table, vacuum pump together.

2, from will add fluoride mouth valve nut, add fluoride pipe twist to add fluoride mouth. Open the vacuum meter table, and then open the vacuum pump power switch, start pumping air into vacuum state. Normal system vacuum degree should be able to to - 756毫米汞柱( - 0. 1Mpa） The following. Vacuum time should be according to the size of the size and vacuum pump type refrigeration system to determine.

3, time after the operation, close the table three-way valve, micro air conditioning pipe valve size, prevent the reverse flow of air, quickly remove the fluoride pipe and vacuum gauge, to open the valve.

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