Refrigerant selection, discussion

the global climate warming, to protect the ozone layer, our country in 1991 to participate in 'to the ozone layer material of Montreal protocol amendment, London in 2003 to participate in' to the ozone layer material of Montreal protocol Copenhagen amendment. Press 'to take the ozone layer material of the Montreal protocol Copenhagen amendment request HCFCs in China is a class need to stop using in 2040. National related departments to formulate a detailed implementation plan, such as R22 in 2013 as the cost of frozen and production level, a 10% cut in 2015, a 35% cut in 2020, 2025 cuts in 67. In 2030 and 5% selection but retain 2 thoroughly. 5% of the amount of maintenance.

as refrigeration professional manufacturers, as screening is the inevitable trend of the future and what refrigerant can be chosen, choose refrigerants what aspects of the request?

R22 was once the world's most widely used fluorocarbon refrigerants, until now, no single medium can replace R22 directly. The global professional bosses recommended some replace R22 substitute goods, including environmental hydrogen fluoride generation hydrocarbon ( HFC) Refrigerant - — Everything, r410a and R407C.

there are many factors of choosing refrigerants needs thinking, because choose any kind of refrigerant machine will all the operation condition of the air conditioning system, reliability, capital and market acceptance of a certain impact. Ambition of refrigerants, except to specific thermal characteristics, a kind of ambition of refrigerant should be nontoxic, nonflammable, and completely in the system. It should be environmental protection, zero ODP value, low GWP value, easy to detect and handle, don't need to be extreme pressure, regardless of the high pressure and low pressure. Choose all conform to the aspiration refrigerants properties, bosses recommended has not completely conform to, then we will briefly discuss the performance characteristics of recommended goods.

R134a has a small capacity than that of R22, the pressure is lower than R22. Due to these characteristics, the ability of using the same everything as compared to volume of the air conditioning, air conditioning and other equipment demand a greater volume of the displacement type compressor, evaporator, condenser and cooling pipe. Set up manufacturing and operation, after all, is led by a system of everything, R22 as cold and everything system will spend more than that of R22 system, higher capital requirements.

R407C capacity and pressure and R22 close to. So as long as the simple adjustment of R22 design system can make the original system is also suitable for R407C system. However, the system can effect comparing will be about 5% lower than the original system. This is due to the relative to other refrigerants, R407C can have up to 6 degrees of temperature drift. Thus R407C system under equal standard condenser and evaporator conditions will reduce heat transfer, influence system can effect comparing.

R410A capacity and pressure is higher than that of R22, working pressure is higher than 50% 60%. Although high gas density can use smaller displacement displacement compressor, can also use the smaller the diameter of the pipe and valve, but high pressure to make the parts of the system has a higher request. Large volume of system more not share.

HFC refrigerants in spite of the ODP value is zero, but there are two conditions restrict its vision, a capacity is small, the second is mixed working medium temperature drift or pressure higher shortcomings, and generally GWP value is quite high. Like everything ODP value is zero, GWP value is 1430, R410A ODP value is zero, GWP value is 2000.

although GWP is not binding on the international law documents. The two countries will begin in cutting with high global warming potential hydrofluorocarbons aspects to strengthen bilateral cooperation, 'the more specific data is' the plan was based on real now 2025 to 2005 emissions by 26% - 28% of full scale reduction policy and will try our best to 28%. 2030 years in our country at the mercy of carbon dioxide emissions peak and will do our best to reach peak at an early date. '

it is series of HFC refrigerant is doomed to be a temporary substitute, choose the suitable low GWP value refrigerant a long way to go.

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