While the various measurements cover dif ferent ranges of temperature and pressure, the mbwr formulation is applicable in both the liquid and vapor phases at pressures up to 10,000 kpa 1500 psla. Thermodynamic cycle and machinery of vaporcompression heat. International journal of thermophysics 1997, 18 1, 161172. The equations of fifteen important cryogenic fluids are presented in a basic format with enthalpypressuretemperatureentropy diagrams and tables of thermodynamic properties. Thermodynamic properties of dupont isceon 39tc refrigerant r423a r4ar227ea 52. Many different refrigerants have been used in the past and are in use today with good ability to transfer heat from one place to another. Ants and refrigerant mixtures refprop version reader pdf file download 6.
An equation of state is a function that can correlate all the thermodynamic properties of a fluid in a consistent way. There are plans to include refrigerants in later releases. Freon 410a thermodynamic properties freon refrigerants. 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.
Tables of the thermodynamic properties of dupont freon. The thermodynamic efficiency of a refrigeration system depends mainly on. Hydrofluorocarbon hfc refrigerants are possible alternatives to replace ozonedepleting chlorofluorocarbon and hydrochlorofluorocarbon hcfc refrigerants. Physical properties chemical formula chcif2 molecular mass 86.
Thermophysical properties of r321254a and its constituent binaries. Technical information at22 thermodynamic properties of dupontz freon. 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. 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.
Surface tension of refrigerants r123 and r4a journal. Refrigerants are the working fluids used in the counter clockwise thermodynamic working cycles. Safety is perhaps the most important single factor in the selection of a refrigerant. Measurement and formulation of the thermodynamic properties. These tables are based on extensive experimental measurements.
The fluid thermodynamic properties were modeled by the extended corresponding states ecs approach laid out by huber and ely. Refrigerant transport properties, such as liquid and vapor density, viscosity, thermal conductivity or surface tension, define heat transfer coefficients and. Because of the problems with damage to the ozone layer, new refrigerants such as r4a have been developed and are now included in the thermodynamic tables. Pdf thermodynamic properties of refrigerant r116 from cubic. Now lets look at the use of thermodynamic tables for refrigerants. The knowledge of thermodynamic and transport properties of refrigerants is required for the analysis and calculation of refrigeration cycles in. The goal of this exploration was to find an optimum combination of these parameters to maximize both cop and the q vol. These properties can be divided into favourable thermodynamic, chemical and physical properties. Tables of the thermodynamic properties of suva 507 are based on values calculated using the nist refprop database mclinden, m. Noted that the enthalpy at point 3 was not dependent on the. The various thermodynamic property tables correlate the following important properties of liquid and vapor. Options for lowgwp refrigerants in small airconditioning.
Reference fluid thermodynamic and transport properties. May 08, 20 in this experiment synthetic chemical refrigerant known as freon 12arcton 12 was used. It was chosen as the preferred equation of state because it provided the most accurate. Tables of the thermodynamic properties of isceon mo59 r417a have been. Thermodynamic properties of alternative refrigerants were presented in literature as limited data. Thermodynamic property tables general because of ammonias widespread use as a refrigerant, comprehensive tables of thermodynamic properties are frequently needed by refrigeration engineers. Pressure temperature specificvolume density enthalpy entropy the latest update of ammonia properties was conducted by r. Thermodynamic properties of duponttm freonr 22 r22. Thermodynamic properties of refrigerant mixtures dtic. Thermodynamic properties of dupont isceon mo29 refrigerant r125r4ar600a 65.
Pdf depletion of ozone layer in the stratosphere and global warming caused due to the use of different cfc and hcfc refrigerants have. It exists two methods to obtain thermodynamic properties. Thermodynamic properties of dupont isceon mo59 r417a. Chapter f29 provides a general discussion of the different refrigerants, and chapter f30 provides pressureenthalpy diagrams and summary tables of the thermodynamic and transport properties of the more common refrigerants. Thermodynamic properties of difluoromethane journal of. The state of the refrigerant was fixed in the chart, by knowing two independent thermodynamic properties such as p and t. Refrigerants thermodynamic, physical, chemical, safety related and environmental properties have been presented and discussed in the first part of the paper. There is a need for a method which can predict the transport properties in the absence of data yet also. The refprop database for the thermophysical properties of. The implicit regression and explicit calculation method allows for the fast and stable calculation of refrigerant thermodynamic properties of saturated, twophase, and superheated refrigerants. Thermodynamic cycle and machinery of vaporcompression. This classic reference text update provides accurate physical heat data for refrigerants for engineers and practical scientists. The refrigerants have a thermodynamic property chart on pressure most cfc refrigerants have been deleted. Pdf correlations for some saturated thermodynamic and.
Summary of the refrigerant systems studied, the properties measured for each. These tables are based on experimental data from the database at the national institute of standards and technology nist. Thermodynamic properties of duponttm freonr 22 refrigerant. In fact, from the thermodynamic or heatcarrying standpoint, differences among refrigerants with similar boiling points are small. In the last session, we had discussed vapor compression refrigeration cycle and in todays session, we can discuss in detail the concept of refrigeration along with its definition, unit, classification of refrigerants and applications. Specific heat capacity cpkjkgk of some gases and vapours. R12 dichlorodifluoromethane properties thermodynamic properties of saturated and superheated dichlorodifluoromethane cf 2 cl 2 specific volume, enthalpy and entropy refrigerant compressors evaporation temperature, condensating temperature and capacity evaporation temperature, condensing temperature and refrigerant compressor capacity. Chapters r06, r07, and r12 of the 2018 ashrae handbook refrigeration provide information on refrigerant system. Physical properties chemical formula ch2f2chf2cf3 5050% by weight molecular weight 72. Nist thermodynamic and transport properties of refrigerants and refrigerant. Selected thermodynamic properties for mixtures of r32 govinfo. New refrigerant development 10 develop techniques for detecting and dramatically reducing refrigerant leakage in currently installed. Pdf thermodynamic properties of dupont freon 22 r22.
Refrigerant r4a thermodynamic properties eng units 2 equations the mbwr equation of state was used to calculate the tables of thermodynamic properties. List important thermodynamic and environmental properties influencing refrigerant selection 5. New tables of the thermodynamic properties of dupont. R32 is a component of r410a, a blend refrigerant widely used in developed countries as a main alternative to hcfc22, an ozone depleting refrigerant. Fortunately ammonia has been very thoroughly studied by thermodynamicists over the years and.
Thermodynamic properties of 1,1,1,2tetrafluoroethane r4a in the critical region. Thermodynamic and transport properties of fluids, 5th. Pdf thermodynamic properties were predicted, for saturated phases and in the singlephase region for refrigerant ri16 c2f6. Herein, we consider the capabilities of monte carlo simulations in the gibbs ensemble to provide vaporliquid equilibrium data of refrigerant mixtures. Thermodynamic properties of suva 404a hp62 refrigerant.
Pdf dupont freon refrigerants thermodynamic properties. In todays world, other properties of the refrigerant are more important. Thermodynamic properties a quantity which is either an attribute of an entire system or is a function of position which is continuous and does not vary rapidly over microscopic distances, except possibly for abrupt changes at boundaries between phases of the system. Thermodynamic properties of r4a tetraflouroethane cf3ch2f. Duponttm refrigerants, technical information keywords. The flammability of a proposed new refrigerant is a major consideration in assessing its utility for a particular application. Functional equations for calculating the properties of lowgwp. This problem requires additional efforts in design, manufacturing and service of the equipment. Thermophysical properties of refrigerants t his chapter presents data for thermodynamic and transport properties of refrigerants, arra nged for the occasional user.
New tables of the thermodynamic properties of freon. Compare different refrigerants and suggest replacements for cfcs and hcfcs 26. Modeling of thermodynamic properties for pure refrigerants and. Pdf thermophysical properties of refrigerants majd. This fluid has good thermodynamic properties, but it is flammable. We explored the thermodynamic space with a vcc simulation model, which used thermodynamic refrigerant properties determined by the parameter values selected from this search domain.
Compared with previous versions, the database includes additional fluids and mixtures including ammoniawater mixtures, improved property models, additional properties, increased calculational speed, an enhanced user interface, and. The simulator used an equation of state to predict the thermodynamic properties of the refrigerant mixtures. These properties can be obtained from an equation of state eos which is often a complex function with associated parameters that vary according to the substance. Measurement and formulation of the thermodynamic properties of. Suva 123 refrigerant tm sdu p o ntuva refrigerants. R410a 5050, have been developed and are presented here.
Thermodynamic properties of duponttm freonr 22 refrigerant author. Sep 14, 2003 version 7 of the nist refprop reference fluid thermodynamic and transport properties database is described. Modeling and evaluation tools 2 characterize the heat transfer and thermodynamic properties and efficiency performance of new refrigerants and blends. 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. Refrigerant 12 dichlorodifluoromethane properties of saturated liquid and saturated vapor. In this study, in order to determine thermodynamic properties as enthalpy, entropy and specific volume values for any temperature and pressure of alternative. Thermodynamic properties of duponttm suvar 404a refrigerant. Physical properties chemical formula ch 2 fcf 3 molecular weight 102. The paper on refrigerants has been divided in two parts. But r410a has a high global warming potential hereafter, gwp of 2088, so a new refrigerant with lower gwp is needed to mitigate climate change. Refrigerants thermodynamic properties evaluation and. Feb 01, 2011 the engineering calculation and simulation of vapor compression refrigeration systems require the availability of simple and efficient mathematical formulations for the determination of thermodynamic properties of refrigerants.
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. The thermodynamic properties of refrigerants are as follows. Enthalpy or heat of combustion is one of the important parameters in assessing the flammability of a proposed. Thermodynamic properties of duponttm freonr 12 r12. Other refrigerants are in the hydrocarbon groups such as propane, butane and ethane. The equipment used for removing the heat continuously for maintaining a low temperature in a space is called refrigerator. Thermodynamic properties of refrigerants using artificial. Depending on temperature levels of the heat source and the heat. All cycle calculations are based on refrigerant properties as represented in the national institute of standards and technology nist reference fluid thermodynamic and transport properties program refprop, version 10. Oct 01, 2014 reliable thermodynamic properties of refrigerants such as pressure, temperature, specific volume, enthalpy and entropy, are required for refrigeration equipment selection and design.
Physical properties chemical formula ccl2 f2 molecular mass 120. This information is based on values calculated using the nist refprop database mclinden, m. Options for lowgwp refrigerants in small airconditioning systems. Influence of those properties, which is of the utmost significance on the vapor compression process effi. This program is based on the most accurate pure fluid and mixture models currently available.
This information is based on values calculated using the nist refprop database. Properties of new refrigerants and predictions for condensation heat transfer enhancement with lowfinned tubes. Write the chemical formula of a refrigerant from its number 6. Prediction of thermodynamic properties of refrigerants. Prediction of thermodynamic properties of refrigerants using. Conversion factors are provided for each property derived from the mbwr equation of state.
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