Diagramma r134a pdf writer

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. Hfc4a was developed to replace chlorofluorocarbon cfc refrigerants that contain chlorine, which damages the ozone layer. Air cooled screw liquid chillers r4a 150 385 tons 527 54 kwi 2 and 3 compressor 50 and 60 hz ashrae 90. Myths and facts of hvac refrigerants daikin applied. Buy mastercool msc98371 manifold conversion kit r12 to r4a. R4a oil specs get a quick look at what an average a. R4a and r12 exhibit similar performance characteristics as refrigerants, with r12 showing a slight advantage. Thermodynamic properties of rl34a l,1,1,2tetrafluoroethane 1 marcia l. Giuliano keywords ukt air conditioning without external unit created date. A comparison between refrigerants used in air conditioning.

Pure r22, pure r4a and some binary mixtures of r22r4a were considered as working fluids. It is intended to be used for advanced technical applications. R4a is more energy efficient and environmentally friendly than r404a with a lower gwp. 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. While that may sound a ways away it is worth mentioning that the. Huber national institute of standards and technology, marcia. 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. The details on the kigali hfc agreement refrigerant hq. Pdf flowboiling of r22, r4a, r507, r404a and r410a. The world has come together to ban hfc refrigerants such as r4a, r404a, and r410a across the world by the year 2100. There are differences between 4 and r4a, though apparently r4 a is generically called r4. Summary of experimental pvt data for r4a source number of data points zhu et al.

The performance of an air to water vapor compression heat pump has been investigated experimentally. Drawn with steamtab using the iapwsif97 formulation. 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. Pressure enthalpy diagram melting line40 o 40 c2 02 0. Can you put r4a refrigerant into a fridge that runs on r404a without causing any damage. Environmental protection agency, states that r4a is not flammable at ambient temperatures and not corrosive to metals such as aluminum. R4a, however, is not a direct replacement for r12 due to incompatibilities in the compressor oils used for each refrigerant. Hydrofluorocarbons are used mainly as residential and automotive refrigerants. Ass a refrigerant, a liquid capable of vaporizing at low temperature, used in automotive air conditioning, the u.

Corresponding to the table of the property functions in chapter 1 you ptu distance education prospectus pdf have to call up the function. Frt18fr7eb2, frt18fr7eq0, frt18fr7eq2, frt18fr7ew0, frt18fr7ew2. R22 and r4 use different oil, so r4 is not a dropin replacement for r22. For thermodynamic properties the library uses new industrial formulation for r4a 1,1,1,2tetrafluoroethane, formulated in helmholtz energy. We have made a number of small changes to reflect differences between the r. R12 systems can be converted to r4a but special modifications to the system are necessary. C system looks like, along with the compressor manufacturer and what the specific r4a requirements are for your car. As an airconditioning refrigerant in newer automobiles, the optimal running pressure for r4a is between 22 and 57 pounds per square inch.

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. P h diagram r4a pdf p h diagram r4a pdf p h diagram r4a pdf download. New tables of the thermodynamic properties of hfc4a have been developed and are presented here. Mclinden thermophysics division national institute of standards and technology. R4atables excel addin sample calculations in excel. Co 2 mollier diagram pressureenthalpy diagram mollier chart in metric units excel file 569 kb. Dupont designed 407c and 410a refrigerants as the hfc replacements for r22 coolant used in home air conditioning systems. R4a is a single component hfc refrigerant tetrofluoroethane commonly used for medium. R4a belongs to a group of chemicals called hydrofluorocarbons hfcs and is also known as hfc4a. R4a and various mixtures of r22r4a as an alternative. Refrigerant r4a pdf this r4a refrigeration technician handbook was developed as.

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. Mollier diagram r4a pdf r4a is a single component hfc refrigerant tetrofluoroethane commonly used for medium temperature applications. R4a is also known as tetrafluoroethane cf3ch2f from the family of hfc refrigerant. The enthalpy of dmac with respect to temperature at saturated condition is given by h 100 at 0. Latitude yciv0157p, latitude yciv0177p, latitude yciv0187p. These devices began using 1,1,1,2tetrafluoroethane in the early 1990s as a replacement for the more environmentally harmful r12 and retrofit kits are available to convert units that were originally r12equipped. Answer a states that r4a changes from a vapor to a liquid as it absorbs heat.

The purpose of the compressor is to take a low pressure vapor and compress it into a high pressure vapor. Po box, the heath, runcorn, cheshire, wa7 4qx tele. 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. Mastercool msc98371 manifold conversion kit r12 to r4a. Sherpha project transcritical r744 heat pumps technicians manual 862 1. View and download frigidaire r4a factory parts catalog online. These coolants match r22 in terms of energy efficiency and are superior to r4. Can r22 refrigerant replaced by 4a cr4 discussion thread. Big cars such as suburbans require more gas as they have bigger systems. Figure 2 compares the twophase flow and distribution of r410a and r4a at low qualities, i. Isobutane r600a isobutane is a hydrocarbon, and hence is flammable. With thermodynamic properties that are very similar to those of r4a, isobutane was used in germany as early as 1992 to replace r12. Thermodynamic properties of r4a 1,1,1,2tetrafluoroethane.