On the future of the refrigerant and long way to go
Date：2017-05-15
Global warming, in order to maintain the ozone layer, China joined the London Amendment to the Montreal Protocol on Ozone Depleting Substances in 1991 and the 2003 Copenhagen Amendment to the Montreal Protocol on Ozone Depleting Substances. According to the Copenhagen Amendment to the Montreal Protocol on Substances that Deplete the Ozone Layer, HCFCs are required to be discontinued in 2040. The relevant parts of the country to develop a detailed implementation of the program, 2013 will R22 and other HCFC consumption and production levels of frozen, by 2015 by 10%, by 2020 to reduce 35% in 2025 to reduce 67.5%, 2030 thorough screening but save 2.5 % Of the amount of maintenance.
As a refrigeration industry manufacturers, HCFC screening is an inevitable trend, which in the future there is nothing to choose the refrigerant, the choice of what aspects of the refrigerant request?
R22 was once the world's most widely used fluorocarbon refrigerant, and until now, no single working fluid has been able to replace R22 directly. Today's global professional gangsters have introduced alternative R22 replacement products, including environmentally friendly hydrogen fluoride (HFC) refrigerants - R134a, R410A and R407C.
There are many factors in the choice of refrigerant demand, because the selection of any kind of refrigerant machine will air conditioning system, the overall operation of the situation, reliability, capital and shopping market tolerance caused a certain impact. Aspiring refrigerants, in addition to having specific thermal characteristics, an aspiring refrigerant should be non-toxic, nonflammable, and completely stable in the system. It should be environmentally friendly, ODP value is zero, low GWP value, simple detection and processing, without the need for extreme pressure, regardless of high pressure and low pressure. To choose the ideal of all the characteristics of the charity, the bigwigs have not yet fully recommended, then we will briefly discuss the features of the recommended products.
R134a capacity than R22 small, lower than the pressure ratio R22. Because of these features, the use of the same R134a air conditioning and other volume of air conditioning compared to the demand for a larger volume of displacement of the compressor, larger evaporator, condenser and cooling pipes. The final result is the establishment of the R134a system, which is the same as the R22, and the R134a system will cost more than the R22 system and demand higher costs. R407C's capacity and pressure are close to the R22 contrast. So simply adjust the R22 design system can make the original system also applies to the R407C system. However, the system energy efficiency ratio will be about 5% lower than the original system. This is because the R407C will have a temperature drift of up to 6 degrees relative to other refrigerants. So R407C system in the same standard condenser and evaporator case will reduce the heat transfer, affecting the system energy efficiency. R410A capacity and pressure higher than R22, operating pressure higher than 50% -60%. High gas density can be used with smaller volumetric displacement of the volume can also be used with smaller diameter piping and valves, but high pressure to make the system parts have a higher request. Large volume of the system is more inappropriate.
HFC refrigerant Although the ODP value is zero, but there are two conditions that constrain its vision, one capacity is small, the second is a mixed refrigerant temperature drift or pressure high-level damage, and throughout the GWP value is still high. Such as R134a ODP value is zero, GWP value of 1430, R410A ODP value is zero, GWP value of 2000.
Despite the fact that there is no legal document on GWP in the international community. But the global greenhouse effect is significant, the global attention to carbon dioxide emissions, from the "Kyoto Protocol" developed countries in the emission reduction targets, and then to the 2014 Beijing APEC meeting on Sino-US climate change joint statement: "to strengthen the hydrofluorocarbons Collaboration: ... The two countries will intensify bilateral collaboration in the beginning to reduce HFCs with high global warming potential. "More specific data are" US programs are 26% reduction in 2005 based on 2005, 28% of the economy - wide emission reduction targets and will try to reduce emissions by 28%. China 's program around 2030 carbon dioxide emissions peak and will try to reach the peak in advance.
So the HFC series of refrigerant is destined to be a temporary substitute, select the appropriate low GWP value of the refrigerant long way to go.
