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The history, status quo, refrigerant replacement and future development

Time:2018-04-02 09:48:33 

Refrigerant developmenthistorycan be dividedinto three stages.The first stage:earlyrefrigerant(1830-1930 year),1834 Perkinsfirst developed invapor compression refrigeration,therefrigeranttwoether(ethylether),then by CO2,SO2 asrefrigerant,howevermost of themare flammableor toxic,or both,and evenhas a strongcorrosive andnotstability,accidents often happen.Thereforethe refrigerantattention tosafety performance.The second stage:Freonphase.Megere in 1931 from thenumeroushydrocarboncompound selected fromR12,thena series ofhalogenated hydrocarbonrefrigerantappears in succession,thematerialperformance,nontoxic,nonflammable,and can adapt to differenttemperature region,significantly improvetheperformance ofrefrigerant.Several kinds ofrefrigerantin air conditioningbecome widespread,including CFC11,CFC12,CFC113,CFC114and HCFC22.To 1970 time metaphase,thethinning of the ozone layeronsurface.This led to the 1987Montreal protocolbyprotocolrequirements,elimination ofCFCand HCFC family.The newsolution is developed forHFC family,to playthemajor roleof refrigerant.Group HCFCas a transitionprogramcontinued to use andwill be gradually phased out.The third stage:the green environmental protectiontype refrigerant.The currentphase of thestudy is not mature,various research trialsarebeing carried out.Is the use of morerefrigerant isCFCsand HCFCs,followed byHFCs.

Forthe CFCs developedon January 1, 1996 toban the production and useof some developing countries,butstill in use.CFCsdisablebecause of CFCsin the atmosphere forsplitand released bythe destruction of the ozone layerCl atoms.According to UNEP(UNEP)provides information,if thestratosphericozonegross reduces 1%,is expected toreach the groundof the harmful ultraviolet radiationwill increase by 2%.Harmfulultraviolet light increases,will produce thefollowingdangers: to reducepeople's immunity,makeskin cancer and cataractpatients increases,theincreased prevalence of infectious disease;ecologicalsystem,so that theplant growth andphotosynthesiswas inhibited,so thatcrops.Somespeciesmay lead tomutations,causenew environmental problems.Thereforethe protection of the ozonehas attractedgreat attention of various countries,has becomea global urgent task.

While HCFCsand HFCscan alsodamage the ozone,whichis onlycontaining chlorineatomnumberis different.At the same time,CFCs,HCFCsand HFCs refrigerantis considered agreenhouse gas,theirimpact on global warmingbysize,depends on theirability toabsorb infrared energyin the atmosphereandtheirduration,available GWP(GWP)to measurethem againstglobal warmingeffect size,its size isrelative to the CO2the greenhouse effectis concerned,theprovisions ofCO2GWP 1.