However, the compressor must use a synthetic polyester lubricating oil. Basu, thermodynamic properties of a new stratospherically safe working fluidrefrigerant 4a, ashrae trans. The thermodynamic properties except for the saturation pressures are calculated from this equation of state. A fundamental equation of state for the helmholtz free energy of r 4a 1,1,1,2. Pby wb00776appa jwcl672borgnakkev1 october 10, 2012 16. Thermodynamic properties of minerals and related substances. Enthalpy of formation dhf o, free energy of formation dg f o, and absolute entropy so substance dh f o kjmol rxn dg f o kjmol. R12 dichlorodifluoromethane properties engineering toolbox.
A theoretically based simplified crossover model, which is capable of representing the thermodynamic properties of fluids in a large range of temperatures and densities around the critical point, is presented. Thermodynamic properties of r4a 1,1,1,2tetrafluoroethane. This is a haloalkane refrigerant with thermodynamic properties similar to r12 dichlorodifluoromethane but with insignificant ozone depletion potential and a somewhat lower global warming potential 1,430, compared to r12 s gwp of 10,900. The heat transfer coefficient for r4a dmac is in the. Pdf thermodynamic properties of refrigerant r116 from. Refrigerant r4a properties thermodynamic properties of refrigerant r 4a. Thermodynamic properties for the alternative refrigerants. Thermodynamic properties of hydrofluoroolefin r1234yf and r1234zee refrigerant mixtures. Thermodynamic properties of duponttm freonr 22 refrigerant author.
Nov 03, 2017 pdf appendix c property tables for r4a. Thermodynamic properties of duponttm freonr 12 r12. Thermodynamic properties for the alternative refrigerants nist. The locations to the left of the saturated liquid curve indicate that the refrigerant is in liquid form and locations to the right of the saturated vapor curve indicate that the refrigerant is in vapor form. Three cubic equations of state geos3c, srk and pr were used.
Measurement and formulation of the thermodynamic properties of. Aug 05, 2017 thermodynamic properties of refrigerant r 4a, also known as 1,1,1,2tetrafluoroethane, r 4a, freon 4a, forane 4a, genetron 4a, florasol 4a, suva 4a or hfc4a and norflurane inn. Standard thermodynamic properties of chemical substances continued molecular. In addition, we define two dimensionless distances from the critical point tt.
It was chosen as the preferred equation of state because it provided the most accurate fit of. Thermophysical properties of refrigerants t his chapter presents data for thermodynamic and transport properties of refrigerants, arra nged for the occasional user. Waldbaum abstract critically selected values for the entropy s288. An equation of state is a function that can correlate all the thermodynamic properties of. Abstract the thermodynamic surlace of r4a is expressed in terms a 32term modified benedict. These physical properties of refrigerants help us select the proper refrigerant for the application as per our requirement. It was chosen as the preferred equation of state because it provided the most accurate fit of the thermodynamic data over the entire range of temperatures and pressures presented in these tables. Freon 4a thermodynamic properties freon refrigerants. Examples include a steam turbine operating in the rankine power cycle to drive an electrical generator and a refrigerant circulating between the compressor, condenser, expansion device, and evaporator of a reverserankine. The thermodynamic surlace of r4a is expressed in terms of a 32term modified benedict webbrubin mbwr equation of state. Thermodynamic properties of r4a mcgrawhill education. Equations of state and tables for ammonia, r22, r4a, r152a, and r123.
Enthalpy of formation dh f o, free energy of formation dg f o, and absolute entropy so substance dh f o kjmol rxn dg f o kjmol rxn s o jmol rxnk aluminum al s 0 0 28. Models commonly used to calculate the thermodynamic properties of refrigerants are summarized. It is based on the most accurate measurements of pressure. Volumetric and thermodynamic properties were predicted for three pure hydrofluorocarbons r32, r125 and r4a as well as for binary and ternary mixtures of these refrigerants. Thermodynamic properties of rl34a l,1,1,2tetrafluoroethane 1 marcia l. Measurement and formulation of the thermodynamic properties. Thermodynamics thermodynamics thermodynamic properties and relations.
These tables are based on experimental data from the database at the national institute of standards and technology nist. This is a haloalkane refrigerant with thermodynamic properties similar to r12 dichlorodifluoromethane but with insignificant ozone depletion. Highaccuracy formulations for 16 refrigerants are recommended. Thermodynamic properties of hydrofluoroolefin r1234yf and. For the basic as well as complex cycle calculations, the accurate determination of the. Thermodynamic properties of refrigerant r 4a, also known as 1,1,1,2tetrafluoroethane, r 4a, freon 4a, forane 4a, genetron 4a, florasol 4a, suva 4a or hfc4a and norflurane inn. In addition, tabular data in the superheated vapor region are given for r 4a to assist students working on compression cycle examples. The model is used to predict the thermodynamic properties of r4a in the critical region from a limited amount of available experimental information. Temperatures are given on the new international temperature scale of 1990 lts 90. In order to carry through a program of finding the changes in the various thermodynamic functions that accompany reactionssuch as entropy, enthalpy, and free energyit is often useful to know these quantities separately for each of the materials entering into the reaction. The information is also accessible from baehr and tillnerroth 1994, thermodynamic properties of environmentally acceptable refrigerants. New stratospherically safe working fluid refrigerant4a. Refrigerant r12 properties table filetype pdf r12 properties table filetype pdf product data summary and thermodynamic tables. Air conditioning air conditioning systems heating, cooling and dehumidification of indoor air for thermal comfort.
Mclinden thermophysics division national institute of standards and technology boulder, co 803033328 u. Pdf thermodynamic properties of refrigerant r116 from cubic. The refrigerants have a thermodynamic property chart on pressureenthalpy coordinates with an abbreviated set of tabular data for saturated liquid and vapor on the faci ng page. Dichlorodifluoromethane properties imperial units properties of saturated liquid dichlorodifluoromethane ccl 2 f 2 density, specific heat, kinematic viscosity, thermal conductivity and prandtl number. Volumetric and thermodynamic properties for pure refrigerants. Thermodynamic properties of 1,1,1,2tetrafluoroethane. R 4a is found to be a suitable alternative to cfc r12 having similar thermodynamic properties. Thermodynamic and thermophysical properties such as bubble point, dew point, vapor pressure, liquid and vapor mass fractions, enthalpy and specific heat are obtained from the literature 6,14,15. R12 dichlorodifluoromethane properties thermodynamic properties of saturated and superheated dichlorodifluoromethane cf 2 cl 2 specific volume, enthalpy and entropy refrigerants commonly used refrigerants methane series, ethane series, propane series, cyclic organic compounds, zeotropic blends, azeotropic blends and organic compounds. The data fit and calculation of constants for hfc4a were performed for chemours at the nist under the supervision. Hfo1234yf is the first in a new class of refrigerants acquiring a global warming potential gwp rating one 335th that of r 4a and only 4 times higher than carbon dioxide, which can also be used as a. For calculations involving thermodynamic properties, one rarely has a collection of experimental data that is suffi ciently large to permit interpolation at all points of interest.
This paper describes the application of java programming on the computation of thermodynamic properties of steam and the hfc4a, 1,1,1,2tetrafluoroethane r4a refrigerant through the java applets. R12 dichlorodifluoromethane properties thermodynamic properties of saturated and superheated dichlorodifluoromethane cf 2 cl 2 specific volume, enthalpy and entropy. Appendix a thermodynamic property tables saturation properties of ammonia ip units saturation properties of ammonia using software refprop nist where the equations and constants for ammonia originate from swatzenberg and baehr 1993, eine neue fundamentalgleichung fure ammoniak, dvktagungsbericht, vol. Thermodynamic properties of minerals and related substances at 298. Table a1 molar mass, gas constant, and criticalpoint properties table a2 idealgas specific heats of various common gases table a3 properties of common liquids, solids, and foods table a4 saturated watertemperature table table a5 saturated waterpressure table table a6 superheated water table a7 compressed liquid water table a8 saturated icewater vapor. Thermodynamics thermodynamic properties and relations. For pure refrigerants, the virial, cubic, martinhou, benedictwebbrubin, and helmholtz nist equations of state and the extended corresponding states model are discussed. The refrigerant in any refrigerator or air conditioner flows continuously through the vapor compression cycle, absorbing the heat in the evaporator and releasing it in the condenser. Thermodynamic properties of duponttm freonr 22 refrigerant. This article describes thermodynamic properties of the refrigerants the ideal refrigerant. R4a thermodynamic properties pdf 77 kb r4a technical. The objective of this paper is to present thermodynamic properties and characteristics of the binary refrigerant mixtures r 32r 4a in compositions 2080%, 3070%, 4060% by mass and of the. Thermodynamic properties of r22 at saturation english units p.
Thermodynamic properties of r4a tetraflouroethane cf3ch2f. Coefficients for this equation and for the ancillary equations representing the saturated liquid and vapor densities and the vapor pressure are presented. Jul 07, 2019 refrigerant r12 properties table filetype pdf r12 properties table filetype pdf product data summary and thermodynamic tables. An equation of state is a function that can correlate all the thermodynamic properties of a fluid in a consistent way. Refrigerant4a property tables msu college of engineering. Waldbaum geological survey bulletin 1259 a summary of the thermodynamic data for minerals at 298. Thermodynamic property table for saturated r4a pressure t. R4a is a single component hfc refrigerant tetrofluoroethane commonly used for medium.
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