Hfc 245fa thermo dynamic properties of oxygen pdf

This invention relates to the use of chlorotrifluoropropenes as refrigerants in negativepressure liquid chillers and methods of replacing an existing refrigerant in a chiller with chlorotrifluoropropenes. Evaluation of hfc245ca for commercial use in low pressure. The measurement uncertainties were estimated to be within 10 mk and within 1 kpa. Comparison of thermophysical properties of hfc 125, 32 and 143a d. Hfc 152a calculated variable effects on effsc 99 table 7. Oct 15, 2009 an international standard formulation for the thermodynamic properties of 1,1,1,2. Like all fluorocarbon refrigerants, hfc245ca will participate in, and react with, an existing fire and decompose.

Critical temperatures and pressures for some common substances. Ruxton, thermodynamic properties of organic oxygen compounds. Hfc245fa, a colourless liquid or gas, is a nonozone depleting alternative for. Properties of hfc 4a, hfc 152a, and cfc12 1 table a. Table a 2 idealgas specific heats of various common gases. Comparison of thermophysical properties of hfc 125, 32 and. Bolaji b o, akintunde m a and falade t o 2011, comparative analysis of performance of three ozonefriends hfc refrigerants in a vapour compression refrigerator. Introduction low temperature heat and waste heat recovery. It was chosen as the preferred equation of state because it provided the most accurate fit of the thermo.

J639, j2773 hfc152a is a climatefriendly refrigerant that may be pursued in the future. A nist traceable calibration certificate is standard. Some of these refrigerants in the real fluids category, e. Theoretical exergy analysis of hfo1234yf and hfo1234ze as. Physical and chemical properties 5cp is a clear, colorless liquid with a slight pesticidelike odor. Refrigerant exim trading llc 12601 nw 115 th ave, unit 111a, medley, fl, 33178 305 884 7882 305 884 7883. Honeywell enovate 245fa blowing agent hfc 245fa, 1,1,1,3,3,pentafluoropropane is a liquid hydrofluorocarbon, which has been developed as a blowing agent for rigid insulating foams. An overview of the properties and applications of hfc 245fa. The only property information on the r4a245fa mixtures available from the public domain are the vaporliquid.

Hfc143a and hfc152a and the development of highaccuracy modified benedictwebbrubin mbwr equations of state for each fluid. Calorimeter performance tests ofhfc245ca and hfc245fa as cfc11 replacements 3 paul glamm, trane, lacrosse, wi in search of chiller energy efficiency 141 vishnu sishtla, carrier, syracuse, ny oilfree hydrostatic bearings for hfc4a centrifugal chillers 148 ubtib hannover 89 114 854 041. Pdf the blends formed mixing hydrofluorocarbons hfc and hydrocarbons. Theoretical exergy analysis of hfo1234yf and hfo1234ze. For reducing the weight of heat exchangers, most of the vehicles aircondition. Hfc optimum scenario i 18 hfccaused ghg emissions under variation of recovery at disposal and annual runtime, in percent of pentanecaused ghg emissions 95% 100% 105% 110% 115% 120% 600h 900h 1200h 1500h 1800h 2100h 2400h 2700h 3000h percentage to pentane 100% hfkw365 reference hfc365 70% retent. It was chosen as the preferred equation of state because it provided the most accurate fit of the thermo dynamic data over the entire range of temperatures and pressures presented in these tables. It has long been used in a variety of airconditioning and refrigeration applications in a variety of markets. Refrigerant properties motor vehicle air conditioning mvac. It is a slight fire hazard with a flashpoint at 225 f. It is expected as a good candidate of replacing the refrigerant hfc 4a. This study is part of an international project coordinated by the subcommittee on transport properties of. The data fit and calculation of constants for hfc125 were performed for dupont at the national institute of standards and tech. The data were analyzed to obtain correlations in terms of density and pressure.

The thermodynamic properties of fluids can be modeled through the use. The equation of state presented here for hfc 143a is valid both in the superheated gaseous phase and compressed liquid phase at pressures up to 35 mpa, densities to 27 kgm 3, and temperatures from the triple point temperature of 161. Request pdf on oct 19, 2010, xianyang meng and others published viscosity and density of 1,1,1,3,3pentafluoropropane hfc245fa. Acetone thermophysical properties chemical, physical and thermal properties of acetone, also called 2propanone, dimethyl ketone and pyroacetic acid. Thermodynamic properties of r227ea, r365mfc, r115, and r. Characteristics of hfc refrigerants purdue university. The use of critical point theory needs further investigation and is beyond the scope of this research. The use and implementation of r245fa are governed by the european regulation no 5172014.

A fundamental equation of state for the helmholtz free energy of r 4a 1,1,1,2. Thermodynamic properties of hfc4a 1,1,1,2tetrafluoroethane staple bound january 1, 1993 by na author. An overview of the properties and applications of hfc245fa. The present equation of state also represents the c p data reported in the liquid phase by russell et al. Genetron 245fa has the most favorable properties for low tem perature heat recovery systems. Request pdf dissociation mechanism of hfc245fa on cu1 1 1 surfaces with and without oxygen covered. The local intermolecular structure and dynamics of a recently proposed alternative refrigerant 2,3,3,3tetrafluoro1propene has been investigated using classical molecular dynamics and ab initio quantum chemical techniques. The data fit and calculation of constants for hcfc123 were performed for du pont at the national institute of standards and tech. Blowing agents both liquid and low boiling blowing agents were considered in this study. An experimental evaluation of capillary tubesuction line. However, most of the heat transfer and flow performances are still not very clear uptodate. Snap listed hfc152a as acceptable subject to use conditions for new vehicles only.

Hfc 143a and hfc 152a and the development of highaccuracy modified benedictwebbrubin mbwr equations of state for each fluid. Artificial respiration andor oxygen may be necessary. Before sharing sensitive information, make sure youre on a federal government site. Equilibrium molecular dynamics calculation of the transport. Thermodynamic properties of hfc4a refrigerant 1,1,1,2tetrafluoroethane engineering ip units equations the modified benedictwebbrubin mbwr equation of state was used to calculate the tables of thermodynamic properties.

The chlorotrifluoropropenes, particularly 1chloro3,3,3trifluoropropene, have high efficiency and unexpectedly high capacity in liquid chiller applications and are useful as more. Hfc 245fa is a newly developed hydrofluorocarbon with a broad range of potential uses including foam blowing agent, solvent and aerosol, and working fluids. The potential for hydrogen bonding is investigated, and evidence is found for weak interactions that do not differ substantially between the two types of fluorine atom. Its primary application on a volume basis is as a blowing agent for rigid insulating foams. Thermodynamic analysis of hfc r152a refrigerant as an. Calorimeter performance tests ofhfc245ca and hfc 245fa as cfc11 replacements 3 paul glamm, trane, lacrosse, wi in search of chiller energy efficiency 141 vishnu sishtla, carrier, syracuse, ny oilfree hydrostatic bearings for hfc 4a centrifugal chillers 148 ubtib hannover 89 114 854 041. It is a replacement for hcfc141b and other fluorocarbon and non fluorocarbon blowing agents. Viscosity and thermal conductivity equations for nitrogen, oxygen, argon, and air. Thermodynamic cycle analysis of mobile air conditioning. Ammonia properties at gasliquid equilibrium conditions figures and tables showing how the properties of liquid and gaseous ammonia changes along the boilingcondensation curve temperature and pressure between triple point and critical point conditions. Correlations of the ideal gas heat capacity, vapor. Optimizing polyiso blowing agents huntsman corporation. The simple correlation for vapor pressures, compressibility factors of superheated vapor and specific volumes of liquid were developed on the basis of the present measurements. Viscosity and thermal conductivity of hfc4a have been calculated by means of equilibrium molecular dynamics emd.

Hfc 152a calculated variable effects on mass flow rate 91 table 5. The liquid blowing agents contemplated included all isomers of pentane, 1,1,1,3,3pentafluoropropane hfc245fa, 1,1,1,3,3pentafluorobutane hfc365mfc, 2chloropropane and trans1,2dichloroethylene. The experiments were performed at temperatures from 2 to 293 k at pressures up to 20 mpa. Thermodynamic properties of hfc4a 1,1,1,2tetrafluoroethane staple bound january 1, 1993 by na author see all formats and editions hide other formats and editions. Hfc152a calculated variable effects on mass flow rate 91 table 5. It is expected as a good candidate of replacing the refrigerant hfc4a.

A thermodynamic property model explicit in the helmholtz energy is presented for the. The liquid blowing agents contemplated included all isomers of pentane, 1,1,1,3,3pentafluoropropane hfc 245fa, 1,1,1,3,3pentafluorobutane hfc 365mfc, 2chloropropane and trans1,2dichloroethylene. A model for hydrogen thermal conductivity and viscosity. The vapor pressures were measured at temperatures from 253 to 373 k and pressures from 87 to 2824 kpa for hfc227ea and at temperatures from 255 to 393 k and pressures from 21 to 1950 kpa for hfc245fa. 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.

Gases and compressed air air, lng, lpg and other common gas properties, pipeline capacities, sizing of relief valves. A thermodynamic property model for the r4a245fa mixture. Dissociation mechanism of hfc245fa on cu1 1 1 surfaces. The fluids are grouped into real fluids, ideal gases, brines, incompressible substances, and mixtures. Table a 1 molar mass, gas constant, and criticalpoint properties. Hfc245ca also has a very attractive theoretical cop, an atmospheric lifetime between that for hcfc123 and hfc4a, but has been shown to be marginally flammable. Refrigerant properties motor vehicle air conditioning. The deviations are attributed to hbonding between oxygen of re170 as. Click on the group to access the table for that group. It has also included selected measurements of the transport properties viscosity and thermal conductivity of both hfc 143a and hfc 152a and the development of detailed correlations for same. Ees provides builtin thermophysical property data for the fluids listed below. Hfc245fa showed only minimal degradation 2% by biochemical oxygen demand. Thermodynamic properties of hfc143a 1,1,1trifluoroethane. Hfc 161 chemical information, properties, structures, articles, patents and more chemical data.

The equation is found to represent the experimental results with average deviations of 2. The thermal conductivity of liquid 1,1,1,2tetrafluoroethane. Vapor pressures of 1,1,1,3,3pentafluoropropane hfc245fa. Moreover, hfo1234yf has similar thermodynamic properties to hfc4a, which makes it a good candidate for replacing the hfc4a. R1234yf, thermodynamic property, thermodynamic cycle, equation of state. Modeling of state and thermodynamic cycle properties of hfo. A thermodynamic property model for the r4a245fa mixtures. The vapor pressures and pvt properties of superheated vapor and compressed liquid of 1,1,1,3,3pentafluoropropane hfc 245fa were measured at wide range of temperature and pressure. Hydrochlorofluorocarbon indicates that the refrigerant is comprised of hydrogen, chlorine, fluorine, and carbon. Measurements and modeling find, read and cite all the.

Modeling of state and thermodynamic cycle properties of. Key word halogenated ethane hcfc123 hcfc141b hfc 4a thermal conductivity transient hotwire method. The c p data reported in the vapor phase by mukoyama et al. Rotational and vibrational spectroscopy and ideal gas heat. Hfc 245ca also has a very attractive theoretical cop, an atmospheric lifetime between that for hcfc123 and hfc 4a, but has been shown to be marginally flammable. Table a3 properties of common liquids, solids, and foods. Its thermodynamic properties are different than hfcs typically used in refrigeration. Key word halogenated ethane hcfc123 hcfc141b hfc4a thermal conductivity transient hotwire method. Hfmd300a hfcd302a mass flow instruments have flow ranges from 05 sccm to 025 slm. It is based on the most accurate measurements of pressure. Group iiia for one mole at 298k and 1 atmosphere pressure. Hfc245fa 20th international congress of refrigeration, iiriif, sydney, 1999. Comparison of thermophysical properties of hfc 125, 32 and 143a.

The fundamental equation is valid for thermodynamic properties of oxygen from the freezing line to 300 k at pressures to 80 mpa. Thermal conductivity of halogenated ethanes, hfc4a, hcfc. Refrigerant r1234yf does not contain chlorine, and therefore its odp is zero wmo, 2007, and its gwp is as low as 4 nielsen et al. R245fa 1,1,1,3,3 pentafluoropropane cf 3ch 2chf 2 34 hfc r245fa. Hfc152a calculated variable effects on effsc 99 table 7. Easy, user friendly digital communications with windows based software interface available. Product stewardship summary 1,1,1,3,3pentachloropropane 5cp. The recovery of r245fa is mandatory under the european regulation no 5172014. Hfc245fa, a commercially important refrigerant replacement for environmentally deficient products containing fluorocarbons, which are known to be ozone depletion compounds. The hfm201 hfc203 meters and controllers have flow ranges from 025 slm to flows of 0 slm. Viscosity and density of 1,1,1,3,3pentafluoropropane hfc. It is a replacement for hcfc141b and other fluorocarbon and nonfluorocarbon blowing agents. For reducing the weight of heat exchangers, most of the. An equation of state for hfc 143a has been developed based on available experimental data.

The data fit and calculation of constants for hfc4a were performed for du pont at the national institute of standards and tech. This paper discusses some of the properties and applications of hfc245fa. The simple correlation for vapor pressures, compressibility factors of superheated vapor and specific volumes of liquid were developed on the basis of the present. Introduction the montreal protocol has regulated the production and use of. Honeywell enovate 245fa blowing agent hfc245fa, 1,1,1,3,3,pentafluoropropane is a liquid hydrofluorocarbon, which has been developed as a blowing agent for rigid insulating foams. Thermodynamic and related properties of oxygen from the triple. Minor, 2008, and its similar thermo physical properties makes r1234yf a good choice to replace r4a in other applications of refrigeration and air conditioning. Enovate is a nonflammable liquid having a boiling point. An international standard formulation for the thermodynamic.

Thermal conductivity of halogenated ethanes, hfc4a. Like all fluorocarbon refrigerants, hfc 245ca will participate in, and react with, an existing fire and decompose. Improving thermodynamic consistency among vapor pressure. Thermodynamic properties of substances and ions at 25 c the thermodyamic properties are arranged by group from the periodic table. This means that calculating the thermodynamic properties with the predictive. Hfc245fa physical properties and environmental characteristics make it suitable for a number of heat transfer applications. The thermal conductivity of hfc 4a was measured in the liquid phase with the polarized transient hotwire technique. It has also included selected measurements of the transport properties viscosity and thermal conductivity of both hfc143a and hfc152a and the development of detailed correlations for same. Refrigerant r1234yf does not contain chlorine, and therefore its odp is zero wmo, 2007, and its gwp.

Dec 07, 2010 the local intermolecular structure and dynamics of a recently proposed alternative refrigerant 2,3,3,3tetrafluoro1propene has been investigated using classical molecular dynamics and ab initio quantum chemical techniques. For the calculation of the transport properties by emd, generalised einstein equations were compared with greenkubo equations and the applicability of the former for engineering purposes was demonstrated. This study is part of an international project coordinated by the subcommittee on transport properties. Cfc refrigerant hcfc refers to the chemical composition of the refrigerant. Structural and dynamic properties of the new alternative. A density functional theory study the catalytic mechanism of hfc245fa on clean and o. Canadian patent number ca 2543985 20, compositions and methods for. Identification of the substancemixture and of the companyundertaking 1. Substance form enthalpy d f h kj gibbs d f g kj entropy j k. Product stewardship summary 1,1,1,3,3pentachloropropane. Viscosity and thermal conductivity of hfc 4a have been calculated by means of equilibrium molecular dynamics emd.