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Refrigerant R12 or Freon 12 is said to be the most widely used of all the refrigerants being used for different applications. No:10/1 D:5 34758 Ataşehir, İstanbul Aksoy Apt. Contact. When retrofitting from R-12 to R-450A the relief valve size will be acceptable assuming the … It is commonly used as a propellant and refrigerant. Refrigerant R134a or HFC-134a is a commercially available hydrofluorocarbon (HFC) refrigerant for use as a long-term replacement for R-12 in new equipment and for retrofitting medium temperature CFC-12 systems. About Refrigerant R-12, liquid; Refrigerant R-12, liquid weighs 1.35 gram per cubic centimeter or 1 350 kilogram per cubic meter, i.e. 25 25 Composition R-22/124/600a/142b R-125/134a/600 (Weight %) (50 / 39 /1.5 / 9.5) (19.5 / 78.8 / 1.7) Molecular Weight 101.6 103.7 These applications are being phased out in developed countries due to the compound's ozone depletion potential (ODP) and high global warming potential (GWP), although global use of R-22 continues to increase because of high demand in … The thermodynamic properties of refrigerant R12 are provided by Martin-Hou equation of state (A.I.Ch.E. Refrigeration systems can be broadly classified into two catego-ries: The authors are at Refrigera-tion and Airconditioning Laboratory, Department of Mechanical Engineering, IIT Madras, Chennai. The saturated gaseous refrigerant enters the adiabatic, reversible compressor at 20 °C at a steady flow rate of 0.2 kg s. It is compressed t (a) What is the pressure of R-12 at compressor inlet? The values of specific enthalpy and entropy are referred to 0 for saturated liquid at -40 C (F). Journal, 1:142, 1955). R134a has relatively low pressure and therefore about 50% larger compressor displacement is required when compared to R22. These refrigerants are primarily used for air conditioning and heat pumps and have replaced R22 in many applications. R-12 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 İçerenköy Mah.Üsküdar İçerenköy Cad. Fitted parameters are from Downing and Knight, DuPont Technical Bulletin RT-52, 1971. (Eski Üsküdar Yolu) Kolordu Sok. MEDIUM-HIGH TEMPERATURE REFRIGERANT (R-12 TYPE) TECHNICAL GUIDELINES Physical Properties of Refrigerants R-414B R-417C Container Size Available (Lbs.) The chemical name of refrigerant R12 is dichlorodifluoromethane and its chemical formula is CCl2F2. The properties calculator retains information from the previous inputs for subsequent user input. compared to R-12, especially as evaporator temperatures get lower. (e.g., Refrigerant 134a would be entered as “R-134a” or by the number 37). This articles describes the properties, advantages, and disadvantages of refrigerant R-12. a data bank for fluid properties: this data bank consists of four basic equations, together with the coefficients characteristic of each fluid; a numerical core, with functions to compute all thermodynamic properties from any set of valid data (for instance, (T,P) or (T,S) in the vapor phase). b) r134a and r407c refrigerant properties. The properties calculator retains information from th e previous inputs for subs equent user input. This refrigerant takes a significant step forward in environmental protection by achieving an ozone depletion factor of zero. Physical Properties of Refrigerants Low Freezing Point. The user need only enter new changed data for a new calculation. (2 marks) (c) Calculate the temperature at compressor outlet. (2 marks) (b) What is the specific enthalpy of R-12 at compressor inlet?

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