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An Overview of R22 Refrigerant Substitution in China

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An Overview of R22 Refrigerant Substitution in China R22 Refrigerant Substitution in China by Min Zhang, Mingming Lu, and Yanmei Zhou An Overview of R22 Refrigerant Substitution in China A look at China’s efforts to replace the R22 refrigerant in order to comply with the Montreal Protocol. em • The Magazine for Environmental Managers • A&WMA • September 2019 R22 Refrigerant Substitution in China by Min Zhang, Mingming Lu, and Yanmei Zhou The 1987 Montreal Protocol recommended using HCFC- alternative refrigerants, and the main achievements of 22 (R22) and HFC-134a (R134a) to replace chlorofluorocar - domestic refrigerant substitution. bons (CFCs) to reduce the damage to the stratosphere ozone layer. Hydrochlorofluorocarbons (HCFCs) tend to stay in the Setting Policy and Guidelines troposphere, the lower layer of the atmosphere we live in, so In August 2016, the Chinese Foreign Economic Cooperation the ozone depletion potential (ODP) of these compounds are Office (FECO), a subsidiary of China’s Ministry of Ecology mostly zero. During this time, the growth of the air condition - and Environment (MEE)—formerly the Ministry of Environ - ing industry in China started to accelerate. As a result, most mental Protection (MEP)—released its HCFCs alternative Chinese air conditioner units used R22 as refrigerant in recommended directory (draft). 3 In response to climate response to the 1987 Montreal Protocol. change mitigation and the Kyoto Protocol, this guideline document recommended refrigerant alternatives in the More than 30 years later, China has become the world’s refrigeration and air conditioning industry, including propane largest producer and consumer of air conditioners, and pro - (R290), isobutane (R600A), carbon dioxide (CO 2) (R744 duced more than 200 million units in 2018, up 10% from and R32), and ammonia (R717), as listed in Table 1. 2017. 1 Though the 1992 (and later) amendments to the Montreal Protocol initiated the phase-out of HCFCs due to On September 18, 2018, FECO held a meeting of industry their high global warming potential (GWP), a lot of Chinese planning agencies to accelerate the phase-out of HCFCs and air conditioners still use R22 as the preferred refrigerant to summarized the progress and next steps of HCFCs elimina - meet the requirements of the 1987 Montreal Protocol. tion in China. Following on from this meeting, 19 major en - terprises in the room air conditioner industry partially realized Today, China’s refrigeration and air conditioning industry is the replacement of R22 with propane (R290) and R410A, actively trying to find new alternative refrigerants for R22 to and carried out adaptive transformation on the production prevent ozone layer destruction, reduce greenhouse effect, line; 4 18 major enterprises in the commercial refrigeration and protect the environment. The urgency of HCFCs refrig - industry are actively researching and developing replacement erant substitution has guided the Chinese government and products of R22; companies in the compressor industry have relevant industries to action. According to the HCFCs phase- vowed to replace R22 with R134A, R32, R744, and R717; out process set out in the Montreal Protocol, from 2016 to and the cooling industry is using R134A and R717 to replace 2020, China needs to achieve the second-phase target of a R22 in water-cooled chillers, and R134A and R32 in air- 35% reduction in HCFCs and completely phase out HCFC cooled chillers and units. 3 production and consumption by 2030, 2 which is significantly faster than the 10% elimination target achieved in stage one. Characteristics of Commonly Used R22 Substitutes There are many different substitutes for R22 based on differ - This article considers China’s efforts in the replacement of ent applications. The main characteristics of R22 and its main R22 to comply with the Montreal Protocol from the aspects substitutes are shown in Table 2. 5 The critical environmental of policy, the use and characteristics of commonly used parameters for evaluation include ODP, GWP, toxicity, and Table 1. Recommended substitutes for R22 in different sectors. 3 Substitute Type Main Application Sectors Refrigerants R290 HC (hydrocarbon) Room air conditioner; Commercial independent refrigeration system R600A HC Commercial independent refrigeration system R744 CO 2 Domestic heat pump water heater; Industrial or commercial (carbon dioxide) heat pump water heaters; Cold storage systems for industrial or commercial use (refrigerants and refrigerant carriers) R717 NH 3 (ammonia) Cold storage; Transport refrigeration; Compressor condensing unit; Industrial refrigeration system R32 HFCs Air conditioning unit; Cold water (heat pump) unit; (hydrofluorocarbons) Heat pump system; Condensing unit em • The Magazine for Environmental Managers • A&WMA • September 2019 R22 Refrigerant Substitution in China by Min Zhang, Mingming Lu, and Yanmei Zhou Table 2. Characteristics of R22 and its substitutes. 5 Refrigerant Molecular Chemical ODP GWP Toxicity Flammability Trade Formula/ Type Names Composition R22 CHClF 2 HCFC 0.055 1810 Slight Nonflammable R290 C3H8 HC 0 20 Non-toxic Inflammable (asphyxiation) R134A C2H2F4 HFC 0 1430 Non-toxic Nonflammable R32 C22F 2 HFC 0 670 Slight Micro combustion R407C R32 (23%) HFC 0 1774 Hypo-toxicity Nonflammable R125 (25%) R134A (52%) R410A R125 (50%) HFC 0 2088 Hypo-toxicity Nonflammable R32 (50%) R404A R125 (42%) HFC 0 3922 Hypo-toxicity Nonflammable R142a (52%) R134a (4%) R600A C4H10 0 3 Non-toxic Flammable and combustible R717 NH 3 0 0 Toxic Flammable R718 H2O 0 0-0.4 Non-toxic Nonflammable R744 CO 2 0 1 Non-toxic Nonflammable R1234YF C3H2F4 HFC 0 4 Hypo-toxicity Micro combustion R452B 0 676 Non-toxic Micro combustion flammability, in addition to thermal properties. As shown in R290 is about 10% higher than that of the air Table 2, R22 does not meet climate change mitigation needs conditioner commonly used with R22 refrigerant at due to its high GWP. More details of select R22 replacement present. 7 alternatives are provided below. 2. R410A (ODP = 0, GWP = 2088) is an HFC-type refrigerant. In addition to good refrigeration 1. R290 (ODP = 0, GWP = 20) causes little or no and environmental protection performance, it is also damage to the stratospheric ozone layer and has non-toxic and not easy to burn. Its thermodynamic a low impact on the global greenhouse effect with and physical properties are close to azeotropic or pure good thermal performance. 6 The latent heat of refrigerant. As an alternative for R22, R410A is mainly vaporization of R290 is more than twice as high as used in automobile air-conditioning, household appli - that of R22. Therefore, under the same conditions, the ances, small fixed refrigeration equipment, medium filling amount of R290 is far less than that of R22, temperature refrigeration in supermarkets, and indus - which is about 43% of that of R22. In addition, since trial and commercial refrigerating machines. The heat R290 has low dynamic viscosity coefficient and high transfer performance of R410A is superior. Under the heat transfer coefficient, the system energy efficiency same conditions, the heat transfer coefficient of R410A ratio of the air conditioner developed to accommodate is 15% higher than that of R22. 8 In most cases, the em • The Magazine for Environmental Managers • A&WMA • September 2019 R22 Refrigerant Substitution in China by Min Zhang, Mingming Lu, and Yanmei Zhou replacement of the R22 without changing the type of are compatible with common lubricants and structural lubricant is also an advantage of R410A. materials and have better heat transfer performance 3. R32 (ODP = 0, GWP = 670) has good thermal- than CFC refrigerants, and is suitable for cryogenic physical and safety properties (low flammability, and ultra-cryogenic refrigeration. However, as a good safety, high thermal conductivity, good thermal greenhouse gas itself, its application should be care - stability). In the same refrigeration system, the fully evaluated. refrigerating capacity can be increased by about 10% compared to R22. The theoretical cooling capacity of Main Achievements of Refrigerant R32 system is much higher than that of R410A system Substitution in China and its comprehensive energy efficiency ratio is much Research and development in refrigerants not only makes higher than that of R410A system. If R32 refrigerant sense from an environmental aspect, but also can create new is used, the refrigerating capacity can be increased business opportunities. Here are some of the main benefits by 10%. 9 and achievements of R22 substitution in China. 4. R134A (ODP = 0, GWP = 1430) has smaller heat capacity and lower pressure than R22. As a Elimination of Production and Consumption of R22 result, the R134A system needs to be equipped with China achieved the first phase of its HCFCs reduction target a larger volume air compressor, larger evaporator, and of 10% in 2015. At present, China has eliminated approxi - pipeline. 10 R134A is widely used as a replacement for mately 280,000 tons of R22, accounting for more than half R22 in small refrigeration devices, automobile air of the total elimination of all developing countries combined, conditioning, and small heat pump units. However, its taking the lead about 2.5 years ahead of schedule, and has GWP value is about 1,430, which means it is a global become a model for developing countries in implementing warming refrigerant, and therefore is not a current environmental protocols. 12 research focus in China. 5. R744 (ODP=0, GWP=1) is safe, non-toxic, Promoting Large-Scale R22 Substitution non-flammable, and has good
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