The data on which the recommended values of the fluid properties are based are considered to be the best. On each page you will find all of the information available for each refrigerant. The thermal conductivity of freon12 in the liquid phase is measured over the temperature range. Unless otherwise noted, the values refer to a pressure of 100 kpa 1 bar or to the saturation vapor pressure if that is less than 100 kpa. Table a17eidealgas properties of air table a18eidealgas properties of nitrogen, n 2 table a19eidealgas properties of oxygen, o 2 table a20eidealgas properties of carbon dioxide, co 2 table a21eidealgas properties of carbon monoxide, co table a22eidealgas properties of hydrogen, h 2 table a23eidealgas properties of.
Stability with metals and refrigeration lubricants. Dichlorodifluoromethane chemical compound britannica. In the last two centuries, human ingenuity made it possible to control fully. The heattransfer coefficient during film condensation of saturated and superheated freon12 on a vertical surface is determined experimentally two sets of data are presented for saturated freon12 condensing, one at constant saturation pressure and another at constant wall temperature, both having temperature differences across the film varying from approximately 0 to 23c. Pdf refrigerant types, issues, trends and future options. The notation p 0 indicates the low pressure limiting value is given. Thermodynamic properties of saturated and superheated dichlorodifluoromethane cf 2cl 2 specific volume, enthalpy and entropy. Thermodynamic properties of the freon refrigerants. Saturated vapor pressure, boiling pointdew point, latent heat of vaporization are saturated properties, just enter one parameter to calculate them. History modern refrigeration methods, as distinguished from the use of ice and snow, go back to the early part of the 19th century.
Ideal gas heat capacity constants are tabulated below as selected from the properties of gases and liquids, 4th ed. Nist standard reference database 23, refprop thermo dynamic properties of refrigerants and refrigerant mixtures, version 3. Heat transfer coefficients for freon12 condensing within a. If it is brought into contact with open flame or heater elements, it decomposes into highly toxic constituents. Liquid nitrogen and freon12 were used in turn as thermostatic liquids in the cryostat. Thermodynamic properties of duponttm freonr 22 refrigerant. In addition to fluorine and carbon, freons often contain hydrogen, chlorine, or bromine. Up to the present time, 70 experimental works have been published containing very broad experimental information about the thermophysical properties of gaseous and liquid freon 22 in wide intervals of temperature and pressure. This tool can be used to determine individual state points by a graphical. The construction of a heated filament measurement device is described. Simply click on the clue posted on washington post crossword on april 16 2017 and we will present you with the correct answer. In order to view these adobe acrobat pdf files, you will need adobes acrobat reader installed on your system.
Dichlorodifluoromethane properties engineering toolbox. Duponttm refrigerants, technical information keywords. It has not only excellent safe properties but also condenses at moderate pressure under normal atmospheric conditions. Dichlorodifluoromethane is an inert gas that has a long history acting as a refrigerant, allowing us to stay cool in the summer, and as a spray propellant for important consumer substances. This colorless, volatile liquid is a versatile solvent. This item appears in the following collections engineering, college of technical reports. Isothermal properties isobaric properties isochoric properties saturation properties temperature increments saturation properties pressure increments. Comparison of environmental impacts and physical properties of refrigerants ko matsunaga executive summary even before the invention of refrigeration, people wanted to improve their life by using ice to provide cold drinks and preserve food. To view the technical specifications of each, simply click on its name or the image of the pdf page that will be opened for you to download. The ideal working fluid or often called refrigerant would have favorable thermodynamic properties, be noncorrosive to mechanical components, and be safe, including freedom from toxicity and flammability. Table aesuperheated refrigerant 4a figure a14eph diagram for refrigerant 4a table a16eproperties of the atmosphere at high altitude table a17eidealgas properties of air table a18eidealgas properties of nitrogen, n 2 table a19eidealgas properties of oxygen, o 2 table a20eidealgas properties of carbon dioxide, co 2. Freon 12 was the brand name that dichlorodifluoromethane was sold.
Freon and oxygen crossword clue answer crossword heaven. It has attracted much attention for its role in the depletion of stratospheric ozone. Figure a14 ph diagram for refrigerant 4a figure a15 nelsonobert generalized compressibility chart table a16 properties of the atmosphere at high altitude table a17 idealgas properties of air table a18 idealgas properties of nitrogen, n 2 table a19 idealgas properties of oxygen, o 2 table a20 idealgas properties of. Refrigerant r12 properties table filetype pdf product data summary and thermodynamic tables. Freon 12, ccl2f2, is used in refrigeration systems. The original process used to synthesize freon 12 on a lab scale was based on the reaction of carbon tetrachloride with hydrofluoric acid and a catalyst as follows.
Spreadsheet calculations of thermodynamic properties. Please select the desired standard state convention. Specific volume v, specific internal energy u, enthalpy h, and entropy s of saturated and superheated dichlorodifluoromethane cf 2cl 2 also known as refrigerant 12 r12. Feb 06, 20 the heat of vaporization of liquid freon 12 ccl2f2 is 4. Spreadsheet calculations of thermodynamic properties larry caretto, david mcdaniel, tom mincer csu, northridgeus air force academycsu, northridge abstract a thermodynamic property calculation tool has been developed based on the excel spreadsheet program. It would not cause ozone depletion or climate change. The data of the site are in good agreement with the national bureau of standards nist, which contains more than 2000 kinds of substances. Using an analogy to onephase flow, the following equation was derived for the region where the film of con densed liquid is annular and turbulents it was found that the data could be correlated over the. Due to its unique properties, freon 12 was particularly suited for this purpose. The tempera ture field within the cryostat was monitored with copperconstantan thermocouplesthree in the. Material safety data sheet dupont freon 22 refrigerant version 2.
Freon12 dichloro difluoromethane is nonflammable, nontoxic and nonexplosive. Freon 12 is the dupont brand name for the chemical dichlorodifluoromethane. Some vapor is led off to maintain the original temperature and pressure with a final mass of 400 kg. Freon, trademark, any of several simple fluorinated aliphatic organic compounds that are used in commerce and industry. Thermodynamic properties of duponttm freonr 12 r12. If there is a chance we have missed the answer you are looking for, feel free to contact us and we will get back to you with the answer as soon as.
Technical information at22 thermodynamic properties of dupontz freon. Thus, freons are types of chlorofluorocarbons cfcs, hydrochlorofluorocarbons hcfcs. Apr 16, 2017 on this page will find the solution to freon and oxygen crossword clue. They are well suited for these and other applications because they are nontoxic and nonflammable and can be readily converted from a liquid to a. The following dates and events illustrate the development of the industry and the variety. Thermal conductivity of gases chart engineers edge. Dupont freon 12 saturation properties temperature reading comprehension for grade 5 pdf table. This chart gives the thermal conductivity of gases as a function of temperature. Freon 12 and similar chloroflorocarbons were first recognized as being potentially useful as a replacement for ammonia in refrigeration systems in the early 1900s. R12 dichlorodifluoromethane properties engineering toolbox. Properties of saturated liquid dichlorodifluoromethane r12 ccl 2 f 2 density, specific heat capacity, kinematic viscosity, thermal conductivity and prandtl number engineering toolbox resources, tools and basic information for engineering and design of technical applications. Thermodynamic properties of refrigerant r4a, also known as 1,1,1,2tetrafluoroethane, r4a, freon 4a, forane 4a, genetron 4a, florasol 4a, suva 4a or hfc4a and norflurane inn.
Dichlorodifluoromethane owes many of its desirable properties to its cf bonds and synthesis involves organofluorine chemistry. Table a16 properties of the atmosphere at high altitude table a17 idealgas properties of air table a18 idealgas properties of nitrogen, n 2 table a19 idealgas properties of oxygen, o 2 table a20 idealgas properties of carbon dioxide, co 2 table a21 idealgas properties of carbon monoxide, co table a22 idealgas. Freon 22 difluorochloromethane is the most widely investigated freon of the methane series. It was used as a refrigerant after it was discovered in 1928 and in aerosol spray but the manufacturing thereof was discontinued after forty five years after scientists discovered its potential danger to the ozone layer. This is a haloalkane refrigerant with thermodynamic properties similar to r12 dichlorodifluoromethane. The physical parameters include density, enthalpy, entropy, saturation pressure, specific heat capacity, viscosity and so on. Thermodynamic properties of duponttm freon r 22 refrigerant author. This information is based on values calculated using the nist refprop database mclinden, m. Other articles where dichlorodifluoromethane is discussed.
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