Material safety data sheet dupont suva 4a refrigerant version 2. Samples shall be custody sealed during longterm storage or shipment. As an airconditioning refrigerant in newer automobiles, the optimal running pressure for r4a is between 22 and 57 pounds per square inch. R4a belongs to a group of chemicals called hydrofluorocarbons hfcs and is also known as hfc4a. Refrigerants update rajan rajendran emerson climate technologies, inc. All books are in clear copy here, and all files are secure so dont worry about it. Dupont s xp10 compared to r4a xp10 properties r4a xp10 chemical formula cf 3 ch 2 f azeotrope. Read online refrigerant r4a book pdf free download link book now. Hfc4a was developed to replace chlorofluorocarbon cfc refrigerants that contain chlorine, which damages the ozone layer. Contaminated refrigerant is substandard blends, which has negative effects to the system.
Thermodynamic properties o f refrigerant mixtures database. Thermodynamic properties of r4a mcgrawhill education. Before 93 we used r12 for our vehicles and now, as i write this article in 2018, there is. Ever since 1993 r4a has been the staple refrigerant for automotive applications.
Comparative analysis of r290r600a with commonly used. Refrigerant freeze r4a 5 refrigerant freeze12 54 refrigerant frigc, fr12, r124 1 refrigerant labels 26 refrigerant maxifrig 3 refrigerant mo99, r438a 2 refrigerant nu22 16 refrigerant r11 refrigerant r114 8 refrigerant r12 177 refrigerant r1234yf 112 refrigerant r12a 20 refrigerant r12a duracool 3 refrigerant. It was chosen as the preferred equation of state because it provided the most accurate. Special care must be taken not to contaminate samples. Transfer properties affect refrigerant side performance in system. Several typical activities performed at auto repair facilities can cause exposure to r4a. This is a haloalkane refrigerant with thermodynamic properties similar to r12 dichlorodifluoromethane but with. Fluidmat has been developed to calculate thermodynamic properties in mathcad more conveniently. Liquid r4a, like r22, can absorb much more water than r12 therefore it would be.
As all hfc refrigerants not damage the ozone layer. The epas updated refrigerant management requirements what supermarkets and property and facility managers need to know what are the section 608 regulations. Hydrofluorocarbons are used mainly as residential and automotive refrigerants. It is now being used as a replacement for r12 cfc refrigerant in the area of centrifugal. It is also a common component in many hfc refrigerant blends and is used. Keeping this in mind, this paper aims to formulate different thermodynamic properties of refrigerant r4a using four basic equations, namely. Contaminated refrigerant is different from refrigerant blends. Solubility, viscosity and density of refrigerantlubricant mixtures final technical report david r. The table shows that the density of the liquid mixtures ranges from 2.
Download refrigerant r4a book pdf free download link or read online here in pdf. This includes storing samples in a secure location to preclude conditions which could alter the properties of the sample. Notice the 2 chlorine atoms in the r12 are missing and hydrogen atoms have been added. 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. Basu, thermodynamic properties of a new stratospherically safe working fluidrefrigerant 4a, ashrae trans. R12 is a colorless gas containing 2 atoms of chlorine and 2 atoms of fluorine, bonded to an atom of carbon. Modeling of thermodynamic properties for pure refrigerants and. Hfc4a does not contain chlorine like cfc12 refrigerant does.
Measurement and formulation of the thermodynamic properties of. Low gwp chiller development honeywell refrigerants. R4a consists of 2 hydrogen atoms and 4 four fluorine atoms, bonded to 2 carbon atoms. New tables of the thermodynamic properties of hfc4a have been developed and are presented here. In october 2016, the hfc phase down steps were agreed upon and became a part of the montreal protocol, which go into effect on january 1, 2019, pending approval. Key properties of the main refrigerants are given in together with their typical application ranges. 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.
R4a is the most commonly used refrigerant for automotive applications rather it be your twenty year old toyota camry or your kenworth t200 semitruck. Refrigerant report introduction perspectives in refrigerant development alternative refrigerants overview global warming and tewi factor hcfc refrigerants r22 as transitional refrigerant chlorine free hfc refrigerants r4a as a substitute for r12 and r22 r152a an alternative to r4a. This site is like a library, you could find million book here by using search box in the header. The epas updated refrigerant management requirements. This air conditioning repair article series discusses the the diagnosis and correction of abnormal air conditioner refrigerant line pressures as a means for evaluating the condition of the air conditioner compressor motor, which in turn, is a step in how we evaluate and correct lost or reduced air conditioner cooling capacity. Table 3 presents the new refrigerant mixtures recently developed and previously commented as replacements for r4a, indicating their composition in mass ashrae, 2019 and the main properties. Environmental protection agency, states that r4a is not flammable at ambient temperatures and not corrosive to metals such as aluminum. While r5a is a viable option for new and existing equipment, it is not a drop in replacement for r12 or r4a. It is safe for normal handling as it is nontoxic, nonflammable and noncorrosive.
Refrigerant blends are mixtures of refrigerants that have been formulated to provide a match to certain properties of the refrigerants originally used. However, the compressor must use a synthetic polyester lubricating oil. The input and output format was aloo changed to yield both speed of sound. If you have pressure and temperature for steam, you can find its. Recharging or recovery of refrigerant in the course of servicing air conditioning systems in vehicles can cause r4a to escape. R4a, chemically 1,1,1,2tetrafluoroethane cf 3 ch 2 f is a nonflammable gas used primarily as a hightemperature refrigerant for domestic refrigeration and automobile air conditioners.
However, mixtures of hfc4a with high concentrations of air at elevated pressure andor temperature can become. It is now being used as a replacement for the more environmentally harmful r12 refrigerant in the area of. Refrigerant r4a thermodynamic properties eng units 2 equations the mbwr equation of state was used to calculate the tables of thermodynamic properties. Figure 3 shows the comparison of some properties of r12, r4a and r22. Section 608 of the clean air act prohibits the knowing release of refrigerant during the maintenance, service, repair, or disposal of airconditioning and refrigeration equipment. Refrigerant r12 properties table filetype pdf r12 properties table filetype pdf product data summary and thermodynamic tables. There are significant differences between r12, r4a, and r5a, which must be considered when handling, processing, applying, or retrofitting with these refrigerants. Overview of low gwp mixtures for the replacement of hfc. R32 is a component of r410a, a blend refrigerant widely used in developed countries as a main alternative to hcfc22, an ozone depleting refrigerant.
It was chosen as the preferred equation of state because it provided the most accurate fit of. Johnsens r4a automotive ac refrigerant 3 12 oz case hfc4a made in usa. Citation international journal of refrigerationrevue internationale du froid. R4a is also known as tetrafluoroethane cf3ch2f from the family of hfc refrigerant. Product kool ac ac manifold vacuum gauge hose diagnostic set, 5ft, refrigeration, r410 r22 r4a r404a with case. This means it traps 1,430 times as much heat per kilogram as carbon dioxide does over a 100year period.
The release of this environmentally damaging gas was outlawed, and regulation of the replacement hfc 4a went into effect. Fast calculation of refrigerant properties in vapor compression. Solubility,viscosity and density of refrigerantlubricant. Environmental protection agency epa listed r4a as an unacceptable refrigerant for certain refrigeration and air conditioning applications under its significant new alternatives. Collected samples are in the custody of the sampler or sample custodian. R12 or cfc12 was damaging and depleting the ozone layer. R1234yf is classified as an a2l mildly flammable refrigerant, and requires the use of equipment designed for use with such a refrigerant. Java applet thermodynamic properties steam r4a refrigerant. Several manufacturers produce detectors that are suited to both refrigerants. Aupoko r4a refrigerant recharging hose kit, ac recharge kit with 12 acme male 14 sae female puncture type can tap valve, r4a quick couple, low pressure gauge and 59 recharge hose. R4a and r5a possess similar energy efficiency and capacity characteristics to r12. It has a great chemical and thermal stability, low toxicity and is nonflammable, besides having an excellent compatibility with most materials.
Heat is lost to the condenser cooling medium as the vapor is condensed to a liquid. Find the properties at point 4, the pressure drop across the expansion device, the quality of the refrigerant and properties at point 1. Technical r4a data sheet features and uses of r4a the refrigerant gas r4a is a hfc replacing r12 in new installations. Transport properties of refrigerants r32, r125, r4a, and. Ass a refrigerant, a liquid capable of vaporizing at low temperature, used in automotive air conditioning, the u. Pressuretemperature table for r12, r4a, and r5a is shown in figure 1. It is now being used as a replacement for the more environmentally harmful r12. A international standard formulation for the thermodynamic properties of 1,1,1,2tetrafluoroethane hfc4a for temperatures from 170 k to 455 k and pressures up to 70 mpa. These tables are based on experimental data from the. The liquid region is also known as the subcooled region.
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