Central air conditioning of commonly used refrigerants and blunt refrigerant injection test

Refrigerant is the working medium of the central air conditioning refrigeration cycle, refrigerant through evaporation in the evaporator heat absorption, condensed in the condenser heat cycle to achieve the goal of refrigeration. Freon is currently widely used refrigerants, its variety, to avoid the trouble of writing the formula is, also in order to facilitate memory, people developed a simplified code to represent a variety of freon refrigerant, such as everything, R22, r410a. Now commonly used in central air conditioning two different refrigerant R22 and R410A. But the average user doesn't know the difference between these two kinds of refrigerants, don't know which one to use good refrigerant. Below to learn about these two kinds of refrigerants. What is a, R22 and R410A? 1, 2 fluorine R22 chemical called a methyl chloride, freon is a member of the family, as part of the hydrogen CFCS. We are using mostly refrigerants of R22. Because of the refrigerant of the ozone layer has a great deal of harm, according to the regulations of the Montreal protocol, * * out to 2020 years ago. 2, R410A is a kind of new refrigerants. New refrigerant R410A composed of two kinds of quasi azeotropic mixture, mainly include hydrogen, fluorine and carbon element, has a stable, non-toxic, superior performance, etc. At the same time as a result of not containing chlorine, so will not react with ozone, which does not destroy the ozone layer. In addition, the adoption of new refrigerant of the air conditioning in terms of performance also improved. R410A is internationally recognized so far used to replace proper refrigerant R22 *, and in Europe and the United States, Japan and other countries with widespread. Second, why want to replace R221 with R410A, R410A belongs to low toxicity, display burning transmissibility. Ozone depletion coefficient is 0, 2, R410A refrigerant R22 ozone depletion coefficient of 0. 05. 3, when using R410A system than the total heat transfer characteristics of R22, so can improve system efficiency, and reduce heat exchanger heat transfer area. Three, R410A and R22 has the following several different features of 1, R410 A consists of HFC - 32 ( R32） And HFC - 125 in weight than the 50 ﹪ mixture refrigerant, for nearly azeotropic mixture refrigerant. But for a single material refrigerant R22. 2 operation pressure is higher than R22, R410A about 50 ~ 70%. 3 is larger than that of R22, R410A vapor density. The system of the same capacity, the refrigerant mass flow rate is the same. Because of the gas piping are the same diameter, so R410A steam flow rate compared with about 30% slower R22. 4, for R32 molecules with high polarity, R410A is more soluble than R22. Four, the right to filling refrigerant in the refrigeration system in actual application, some of the following methods often can use testing adequacy of refrigerant in the refrigeration system, let's resolve the disadvantages of the filling way: 1, with the hand touch the suction, exhaust pipe perception of copper tube heat and cold; 2, observing the air bubbles in the liquid lens; 3, measurement of high and low pressure; 4, measure the compressor current; 5, and calculated the heat; 6, watching what is on the condensation of the suction; 7, weight note.

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