Refrigerant and upgrading of the subject has been talked about for years, and even can be traced back to 1991, China signed the Montreal protocol. According to the decision, to 2013, 2013 HCFCs output and consumption must be freeze to baseline levels in 2009 and 2010, the average cut 10% by 2015, 2030, in addition to the small amount is used to repair fully eliminated. Current our country household air conditioning refrigerants of R22 used most, namely as - 22. R22 chemical name is methylene fluoride a chlorine, ozone QianNengZhi (ODP) is 0.055, the coefficient value of global warming (GWP) of 0.36. R22 were limited in the Montreal protocol in 2020, R123 was restricted in 2030, developing countries can be deferred for 10 years. R22\'s main environmental substitute R404A, R290, R23, R407C, R410A, R411A R417A R1270. At present, the household air conditioning field, are known to be the most alternative R290 prospects of alternative refrigerants. R290 chemical name is propane, destruction of ozone QianNengZhi (ODP) is 0, coefficient of global warming (GWP) of 0.01. In fact, at present in Germany R290 has been used in household water heater and air conditioning systems. R410A is a kind of mixed refrigerant, it is made of R32 (methylene fluoride) and R125 (5 fluoro ethane) consisting of a mixture, does not destroy the ozone layer QianNengZhi global warming (GWP) is less than 0.2. Mainly USES the R290 replace current household air conditioning, commercial, industrial, mostly choose R32, a small number of using R410A, CO2 and NH3. But R290 also has shortcomings, that is flammable and explosive. Because of this, to become the biggest obstacle of the large-scale promotion. Sellers of hydrocarbon refrigerants, once told the media, said the company from 2006 began to promote R290 refrigerants, but air conditioning manufacturers worry that no inflammable, explosive, eventually the company can only cooperate with some installation services company in the society, to energy conservation and environmental protection as a selling point to attract enterprises and institutions of the old air conditioning for refrigerants. In 2011, according to a report in the European Union is revised air conditioner energy efficiency standards, consider the GWP value combined with the entry barrier of energy efficiency, when using low GWP value refrigerant, threshold of energy efficiency to reduce accordingly, if use high GWP value refrigerants, threshold of energy efficiency is high accordingly. In India, the use of R290 air-conditioning production line has already started. Godrej&Boyce manufacturing company in early 2012, India announced for refrigerants R290 used fission and window air conditioner in the launch of the new production line. New R290 air conditioning will be sales in India\'s cities, at the same time, Godrej&Boyce company will also conduct professional training for relevant technical staff, to ensure that the equipment installation and maintenance safely. Time to enter at the end of 2012, as is getting closer and closer to the time limit stipulated by the Montreal protocol, an air conditioning refrigerant generation began to stride. In September 2010, gree, independent research and development success R290 (propane), environmental protection air conditioning. At the Canton fair in the autumn of 2012, gree exhibited high efficiency dc frequency conversion centrifugal and R290 refrigerant environmental protection air conditioning unit. Hugely popular R290 refrigerant air conditioning in the maldives, currently installed to all government agencies, including the presidential palace. Soon in December 2012, gree global debut \"R32 environmental protection refrigerant air conditioning\" VDF certification. Gree also get Montreal the multilateral fund of $14.66 million, is used to apply for the 5 production lines, product type involving ChanYuanJi, VRF, cold water machine for industry and commerce, etc., alternative route is R32, R410A, R134A has a commitment to eliminating HCFCs2607 tons. Domestic enterprises engaged in research on refrigerant replace not only the gree, several big companies such as midea, haier, air conditioning chigo, TCL etc. Enterprise is devoted to the study of the environmental protection refrigerant. In 2007, the Chicago research of CO2 and R290 rotary compressor, beauty cheese R290 line signed on as the United Nations in 2011 Montreal multilateral fund official first R290 compressor demonstration project, about R32, R290 and R161 three new environmental protection refrigerant key technology and application research project officially passed the appraisal. However, flammable and explosive of R290 is still a big obstacle to the promotion. This is the production standards and security. On the one hand, the air conditioning is a semi-finished products, the installation must ensure that eliminate risk factors. On the other hand, no related national standards. In this situation, although R290 air conditioning is environmental protection product, and gain recognition in the international market, but it is still not listed in the domestic market, because there are no related to the 3 c certification standards. Because R290 is colorless, odorless, ordinary people can not discern have air conditioning refrigerant leakage, leakage happened one thousand, R290 is flammable and explosive, is a disaster for the user. Moreover in terms of installation, the air conditioning installation is not standard phenomenon is very common, if in the process of installation and maintenance operation is not standard, once accident, is not only the person from injury of workers, possibly involving air conditioning separate-bodied air-conditioners, next to the unpredictable consequences. The new standard will come into effect on May 1, 2013, the new join flammable refrigerants in identification, transportation, installation, storage, filling the safe operation and use, increase of flammable refrigerants appliance installation and maintenance requirements. (source:)