Diagramma r134a pdf writer

This report has been made available to the public as part of the author companys. Thermodynamic properties of rl34a l,1,1,2tetrafluoroethane 1 marcia l. Thermodynamic properties of r4a 1,1,1,2tetrafluoroethane. Pure r22, pure r4a and some binary mixtures of r22r4a were considered as working fluids. Mollier diagram r4a pdf r4a is a single component hfc refrigerant tetrofluoroethane commonly used for medium temperature applications. Huber national institute of standards and technology, marcia. Hfc4a was developed to replace chlorofluorocarbon cfc refrigerants that contain chlorine, which damages the ozone layer. Refrigerant r4a pdf this r4a refrigeration technician handbook was developed as. While that may sound a ways away it is worth mentioning that the. Isobutane r600a isobutane is a hydrocarbon, and hence is flammable.

Thermodynamic properties of r4a 1,1,1,2tetrafluoroethane m. Counterfeit r4a refrigerant containing, among other gases, significant. With thermodynamic properties that are very similar to those of r4a, isobutane was used in germany as early as 1992 to replace r12. We have made a number of small changes to reflect differences between the r. Frt18fr7eb2, frt18fr7eq0, frt18fr7eq2, frt18fr7ew0, frt18fr7ew2. R4a oil specs get a quick look at what an average a. There are differences between 4 and r4a, though apparently r4 a is generically called r4. Giuliano keywords ukt air conditioning without external unit created date. R22 and r4 use different oil, so r4 is not a dropin replacement for r22. P h diagram r4a pdf p h diagram r4a pdf p h diagram r4a pdf download.

Myths and facts of hvac refrigerants daikin applied. Hydrofluorocarbons are used mainly as residential and automotive refrigerants. The purpose of the compressor is to take a low pressure vapor and compress it into a high pressure vapor. The performance of an air to water vapor compression heat pump has been investigated experimentally. It is intended to be used for advanced technical applications. Environmental protection agency, states that r4a is not flammable at ambient temperatures and not corrosive to metals such as aluminum. Pdf flowboiling of r22, r4a, r507, r404a and r410a.

Sherpha project transcritical r744 heat pumps technicians manual 862 1. The details on the kigali hfc agreement refrigerant hq. Temperature and pressure chart of refrigerants r22, r410a, r12, r4a, r401a, r409a, r502, r404a, r507a, r408a and r402a related searches for r4a working pressure chart related searches r4a pressure chart pdf auto r4a pressure chart r4a pressure chart for cars pressure temperature chart r4a r4a pressure temp chart r4a pressure. Can you put r4a refrigerant into a fridge that runs on r404a without causing any damage. Po box, the heath, runcorn, cheshire, wa7 4qx tele. R12 systems can be converted to r4a but special modifications to the system are necessary. Ass a refrigerant, a liquid capable of vaporizing at low temperature, used in automotive air conditioning, the u. Dupont designed 407c and 410a refrigerants as the hfc replacements for r22 coolant used in home air conditioning systems. Buy mastercool msc98371 manifold conversion kit r12 to r4a. Drawn with steamtab using the iapwsif97 formulation. The world has come together to ban hfc refrigerants such as r4a, r404a, and r410a across the world by the year 2100. Answer a states that r4a changes from a vapor to a liquid as it absorbs heat. R4a and various mixtures of r22r4a as an alternative.

Mclinden thermophysics division national institute of standards and technology. R4a is a single component hfc refrigerant tetrofluoroethane commonly used for medium. Pressure enthalpy diagram melting line40 o 40 c2 02 0. Corresponding to the table of the property functions in chapter 1 you ptu distance education prospectus pdf have to call up the function. R4a belongs to a group of chemicals called hydrofluorocarbons hfcs and is also known as hfc4a. Co 2 mollier diagram pressureenthalpy diagram mollier chart in metric units excel file 569 kb. In addition, r4 is in a different pressuretemperature class, and will not work in a system with a compressor designed for r22 there are refrigerants considered by to be more environmentally friendly than r22, but when i compare the odp and gwp i really fail to see that r22 replacements are all that.

Enthalpy kjkg 140 160 180 200 220 240 260 280 300 320 340 360 380 400 420 440 460 480 500 520 540 560 pressure bar 0,50 0,60 0,70 0,80 0,90 1,00. As an airconditioning refrigerant in newer automobiles, the optimal running pressure for r4a is between 22 and 57 pounds per square inch. Latitude yciv0157p, latitude yciv0177p, latitude yciv0187p. R4atables excel addin sample calculations in excel. R4a and r12 exhibit similar performance characteristics as refrigerants, with r12 showing a slight advantage.

With the discovery of the damaging effect of cfcs and hcfcs refrigerants to the ozone layer, the hfc family of refrigerant has been widely used as their replacement. Can r22 refrigerant replaced by 4a cr4 discussion thread. Summary of experimental pvt data for r4a source number of data points zhu et al. There will ususally be three cans of r4a mixed with oil, a charging tube, and fittings to convert the old r12 to r4a style connectors.

For thermodynamic properties the library uses new industrial formulation for r4a 1,1,1,2tetrafluoroethane, formulated in helmholtz energy. Mastercool msc98371 manifold conversion kit r12 to r4a. The main purpose of this study was to investigate the possibilities of using r4a as a working fluid to replace r22 for vapor compression heat pumps. New tables of the thermodynamic properties of hfc4a have been developed and are presented here. R4a, however, is not a direct replacement for r12 due to incompatibilities in the compressor oils used for each refrigerant. Flowboiling of r22, r4a, r507, r404a and r410a inside a smooth horizontal tube article pdf available in international journal of refrigeration 286. C system looks like, along with the compressor manufacturer and what the specific r4a requirements are for your car. A comparison between refrigerants used in air conditioning. This introduction to r is derived from an original set of notes describing the s and splus environments written in 19902 by bill venables and david m. Big cars such as suburbans require more gas as they have bigger systems. R4a is more energy efficient and environmentally friendly than r404a with a lower gwp.