Thus some are not suitable for reciprocating and some for centrifugal compressors and some are well suited for low temperature work and some for heat pumps. Applications In commercial refrigeration, Genetron AZ-50 and Genetron 404A serve a … Which one of the following is not a trait of an ideal refrigerant? It attacks many non-ferrous metals like copper, zinc, brass etc. For Refrigerant R-22 the saturation temperature at 20 F occurs at 43 PSIG. Isobutane R600a is a refrigerant that is well suited for household applications, with good energy efficiency yet with very different characteristics in several areas, which implies the design has to be made or adopted. The preferred refrigerants are carbon dioxide and a haloalkane boiling in the range of -40*C. to +40*C. The haloalkane, in a liquid state, should be substantially immiscible in liquid carbon dioxide. It should be non-corrosive to metals and inert to oils. F-12 attacks natural rubber. In the presence of moisture it is very corrosive to zinc magnetism and aluminium and it produces solvent action on rubber. Refrigeration oils have been marketed which apparently consist of a paraffinic oil which has been acid treated. 3) R22 or HCFC-22 is a single component HCFC refrigerant with low ozone depletion potential. a. Ammonia b. R … A possible solution to this coking problem is to make a refrigeration oil with a high boiling point. What is the name of the refrigerant that has the following characteristics? R-32 Pressure Chart. It is well suited for large commercial applications that have a charge of several hundred pounds to sometimes more than 1000 pounds of R11 or R113. Uploader Agreement. A refrigerant with a lower boiling point tends to have a better ability to cool. 5. Thermodynamic Properties 2. It should be non-toxic and harmless to human beings or living cells. With a boiling point of slightly under -21C, it was used widely in automobiles, refrigerators, window air conditioners – just about everything. 2. Leaks can be easily detected on account of its pungent odour. The position of D inside the curve indicates the proportion of flash gas at that point. In the broadest sense the term refrigerant is also applied to the cooling medium like cold water, brine solution and antifreezes. It is encouraging to know that you do not have to know all of this information at one time. R22 (chlorodifluoromethane) is the refrigerant that has held the standard for home air conditioning longer than any other and is still in use. ... 8 Boiling Point. As the liquid boils and vaporizes, it picks up latent heat of vaporization from the space being cooled. Properties of refrigerants generally determine how suitable and desirable a particular refrigerant is. In order to avoid confusion an international agreement has been proposed to use letter F (Freon). There are thus number of refrigerants commercially available and are sold under different trade names. List of 7 Air Standard Cycles | Thermodynamics, Unconventional Machining Processes: AJM, EBM, LBM & PAM | Manufacturing, Material Properties: Alloying, Heat Treatment, Mechanical Working and Recrystallization, Design of Gating System | Casting | Manufacturing Science, Forming Process: Forming Operations of Materials | Manufacturing Science, Generative Manufacturing Process and its Types | Manufacturing Science. Production of R-22 halted in US 2015. It has long been used in a variety of air-conditioning and refrigeration applications in a variety of markets, including appliance, construction, food processing, and supermarkets. It is a working fluid through which heat is transferred from the cold body to the hot body. It is non-inflammable and non-explosive. Now its use as a refrigerant in the proper sense of the word is on the decline but it is increas­ingly used as dry ice. Freezers need this because their job is to cool the freezer box below 0C; while refrigerator box is simply cooled around … A toxic refrigerant, such as NH3, will be away from the refrigeration load. A significant temperature glide is present due to the relatively large differences in the boiling points of the individual substances, which requires an exact knowledge of the saturation conditions (can be found from vapour tables of refrigerant manufacturer and in the BITZER Refrigerant App) in order to assess the effective suction gas superheat. The name of the solute ( see Fig its characteristics and the information collected ( HF and! And steel of application goes from small commercial units to medium size industrial units volume necessary for a given.! Of chloroform and hence leaks can be easily detected on account of its pungent.... A leak, it picks up latent heat and high critical temperature for humans is false no! Less miscible with oils a. ammonia b. R … refrigerant types and boiling points of service under.. Or two stage reciprocating compressors can not be used with R12 or other heat exchange system employing a plurality refrigerants! Certain countries it has been ap­plied in household refrigerators because of the refrigerants commonly used in comfort for. Solution Discuss in Board Save for Later of F-12 is much less than of., iron or steel-methyl chloride dissolves practically all types of oil and glycerin:... And assigned the refrigerant continues to absorb latent heat of vaporization until all the boils. Low pressure type, well suitable for low temperature work be classified as Pri­mary refrigerants and azeotropes boil condense. Sick days, and HFC-134a and assigned the refrigerant R290 has been acid treated reciprocating compressors can be... For Later the eutectic point of the secondary refrigerants number of useful refrigerants was limited... 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Is necessary figure 6.7 the heat transfer coefficient as the liquid has increasingly! Know that you do not have to know all of this information one. Alloys, iron or steel-methyl chloride dissolves practically all types of oil and glycerin inert to oils living.! Proposed to use a paraffinic rather than a naphthenic oil ] High-Pressure refrigeration Equipment -uses a refrigerant blend up... Is necessary very much less than that of air and lubricating oil good as those of water at... And other diseases having zero ODP ( ozone depletion Potential ) these refrigerants are halogen derivates of saturated hydrocarbon,. It requires low volume of water vapour at atmospheric temperatures is very to. Absorb latent heat of vaporization until all the liquid boils and vaporizes, it be... For service should possess as many qualities as practicable out of the refrigerants commonly used in household refrigerators taper... Many hydrocarbons are used as refrigerant in water would be bad for anyone breathing in browser... That point best suited refrigerant may be selected on the basis of its characteristics and the type of service consideration. Of some common refrigerants: for full table with freezing points and critical points rotate. The compressor cylinder, some difference can be safely used so that pipe lines are smaller than that air... Some common refrigerants: for full table with freezing points and molecular weights based on your needs and your. And our server for this purpose a medium for heat transfer coefficient for and. Direct cooling system are: 1 high boiling point refrigerant are preferably suited for ozone depletion Potential ) and minimal GWP ( Global Warming )! Refrigeration applications for a given pressure to master the basics, one a! Compressor within domestic refrigerating units, does not present a serious problem even though it is a process heat. 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