New criteria for the provisions of flammable refrigerants over environmental protection refrigerant alternative authentication without standard can depend on the situation. R22 is our country at present are the largest and the most widely application scope of refrigerants, but for the ozone layer will cause great damage. Refrigerant replacement has been a worldwide problem, there is no perfect alternative refrigerants, just choose the relatively better now. \"China refrigeration and air conditioning industry association technical staff explained that the main R290 in alternative household air conditioning, commercial, industrial, mostly choose R32, a small number of using R410A, CO2 and NH3. But R290 have flammability, R32 have flammability, R134A has a relatively mature alternative and R410A greenhouse index on the high side. We have learned, midea, gree, haier, chigo, TCL and other enterprise is devoted to the study of the environmental protection refrigerant. In July 2011, the beauty of R32, R290 and R161 three new environmental protection refrigerant technology and application of key research projects formally through the appraisal of science and technology. During the same month, the world\'s first demonstration of R290 fission air conditioning production line of gree officially completed, both by China and Germany joint expert group acceptance. In August 2012, won the global environmental protection refrigerant air conditioning gree R32 debut VDE subordinate institute of electrical engineers association (Germany) certification. However, when using new environmental protection refrigerant air conditioning products in the face can\'t listed embarrassed. Because according to the regulation, product need to pass 3 c certification, but before the implementation of the new standard, this kind of product safety certification is lack of corresponding basis.\" Mainly is a question of security protection, air conditioning factory is a semi-finished products, the installation link to eliminate risk factors. \"The Chinese electrical appliances research institute major appliances division engineer Hu Zhijiang analysis, R290 because of its flammability, support safety standards need to do a lot of experiments, and the old standard of refrigerant in the lowest flammable concentrations have qualified. So according to the requirements of the old standard security, R290 and R600 flammable refrigerants are not allowed for the related categories. According to introducing, because of R290 colorless tasteless, ordinary people can not distinguish whether air conditioning refrigerants have leaked. In respect of installation, because the air conditioning installation murky phenomenon exists generally, in case of leakage accident, damage is not only install the personal safety of workers, and may endanger the personal property safety of the user. The new standard makes up for the blank for flammable refrigerant product standard is adopted. But have the relevant person in charge of enterprise also told reporters that R290 system efficiency is higher, raw material consumption has dropped, but need to increase the corresponding security measures, the final cost will be increased. In addition to air conditioning products shall be carried out in accordance with the inflammable and explosive goods management, warehousing logistics cost will increase a lot. At the same time, let the consumer trust to accept new refrigerant also needs a process, therefore must also be related knowledge training for sales staff, intensify propaganda promotion, and this a series of measures will directly affect the product\'s final selling price, also need to the whole industry to face and solve problems together. (source: Chinese consumers, the author: Zhao Xiong)