With R22 refrigerant discarded deadline approaching, R22 refrigerant replacement problem also became many manufacturers at home and abroad the most issue of concern. The market at present is the most environmental protection refrigerant R410A and R290A hydrocarbon environmental protection refrigerant replacement, what trends, each big manufacturer still wait-and-see attitude. Whether the R22 refrigerant substitute market prospect and fate? Refrigeration express reporter recently, this issue brings thermal energy research institute of tianjin university professor a horse too some views. There is no doubt that R22 alternative is the fact that cannot be changed. The government also encourages enterprises to adopt more environmentally friendly alternative technologies, in the project when the choice, the relevant policies of the government is inclined. The horse a professor too tells us. Reduce the R22 as refrigerant, such as consumption is our country must perform international obligations. Now have launched R410A as part of the HFC, ODP value is 0. It is not a simple replacement of R22, because of work pressure and volume unit refrigerating capacity and other important parameters. Although highly recommended R410A foreign companies such as dupont, but for Chinese manufacturers R410A is facing many technical problems. New refrigerant, such as patent first, R410A largely in the hands of foreign companies such as dupont and honeywell, if Chinese enterprises want to using R410A, must each pay a royalty to the foreign companies, this undoubtedly greatly improve the production cost of the air conditioning. Secondly, R410A and R22 itself nature difference, related supplementary equipment also differ. For example R410A air-conditioning work pressure is 1.5 times that of R22 this request in the pressure resistance of air conditioning system should consider when product design, such as pressure performance of two, and piping should be redesigned, copper pipe\'s wall thickness to increase. Refrigerant replacement is a worldwide problem, the main using R290 replacement of household air conditioning, commercial, industrial, mostly choose R32, a small number of using R410A, CO2 and NH3. \"There is no perfect alternative refrigerants, choose the relatively better now.\" China refrigeration and air conditioning industry association technical personnel explain, R290 have flammability, R32 have flammability, R134A has a relatively mature alternative technology and higher GWP index of R410A. Remarkably, the using new environmental protection refrigerant air conditioning products face the embarrassment of not listed R290 air conditioning is so. Product need to pass 3 c certification, but not yet implemented such products safety standards, no certification basis. An enterprise\'s R290 (commonly known as propane) home of air conditioning water heater production line inspection up to now, failed to list at home, some exports. \"Business is totally passive, this no revision of relevant standards and regulations, market is not acceptable.\" Thermal energy research institute of tianjin university explained a horse too. \"It involves the standard question, is that all the enterprises need to solve. Second, is the issue of security protection, air conditioning is a semi-finished products leaving the factory, installation link to eliminate risk factors.\" R290 because of its flammability, safety standards need to do a lot of experiments, the current product standards is limited to the lowest concentrations of combustible. According to the requirements of the existing security and R290 and R600 flammable refrigerants are not allowed for the related categories. It is reported, the government department is making some measures to make up for the blank place. Some certification experiment reform is in progress. GB4706.32-2004 revision of the new standard will come into effect on May 1, the new join flammable refrigerants in identification, transportation, installation, storage, filling the safety of the operation and use, increase of flammable refrigerants appliance installation and maintenance requirements. (article source: refrigeration letters)