Some of our calculators and applications let you save application data to your local computer. For others like R11 and water, a centrifugal compressor is required to handle the large volume. Chlorofluorocarbon (CFC) products such as R-12 are no longer manufactured but are still used in a variety of systems, and service refrigerant is sometimes still available in reclaimed form in some developed countries including the United States. For others like R11 and water, a centrifugal compressor is required to handle the large volume. Coefficient of Performance; Sign up to receive exclusive communications about offerings, events, news, surveys, special offers and related topics via telephone, email and other forms of electronic communication. state equation, equation of saturated vapour pressure, equation of liquid volume, equation of specific heat capacity, enthalpy and entropy for r11, r12… Chlorofluorocarbon (CFC) products such as R-12 are no longer manufactured but are still used in a variety of systems, and service Flow patterns were determined by strobe-light enhanced visual observation from sight glasses at the inlet and outlet of the test section. Most of the refrigerating systems specially the domestic units replaces R12 by R134a, this study make a comparison of performance between the two cycles specially in the condenser where the main difference between R12 and R134a, while in the evaporating where the pressure of the refrigerant determines the evaporator temperature and therefore the cooling capacity of the system ,the two refrigerants are … The chemical name of refrigerant R12 is dichlorodifluoromethane and its chemical formula is CCl2F2. Copyright © 2021 Honeywell International Inc. https://sustainability.honeywell.com/us/en/search-results.html, None, %vol. The predominate flow pattern was wavy-stratified flow. The specific heat of the liquid should be as small as possible. Using constant specific heats, Eq. Please read AddThis Privacy for more information. Specific Heat The specific heat of the liquid should be as small as possible. Other Notes; U.S. production stopped December 31, 1995. vapour specific heat lies in the range of 40 to 100 kJ/kmol.K. In this refrigeration system the selected refrigerant should have very low specific heat in liquid phase and high specific heat in vapor phase. compare water as a refrigerant (R718) with the refrigerants R717 (ammonia), R12, R22, R134a, R152a, and R290 (propane). Figure 1 is a plot of R12's heat transfer coefficient versus quality. Google use cookies for serving our ads and handling visitor statistics. Dichlorodifluoromethane - R-12 - is a chlorofluorocarbon halomethane used as a refrigerant and aerosol spray propellant. Refrigerants belonging to Group A1 (e.g. R11, R12, R22, R134a, R744, R718) are least hazardous, while refrigerants belonging to Group B3 (e.g. R12 : Introduction Dichlorodifluoromethane (R-12) is a colorless gas usually sold under the brand name Freon-12, and a chlorofluorocarbon halomethane (CFC) used as a refrigerant … ... For refrigerants like R12, R500, R22 etc., a reciprocating compressor is suitable. Manufacturing was discontinued in 1995 due to concerns about damage to the ozone layer. Only emails and answers are saved in our archive. Dichlorodifluoromethane Liquid Specific Heat (c p) (250 K : 0.902 kJ/kg.K) (300 K : 0.980 kJ/kg.K) Dichlorodifluoromethane Liquid/gas equivalent ( 1.013 bar and 15 o C (59 o F)) : 292 vol/vol Dichlorodifluoromethane Liquid Dynamic Viscosity (250K : 336 10 6 Ns/m 2 ) (300K : 213 10 6 Ns/m 2 ) These applications will - due to browser restrictions - send data between your browser and our server. The material has a molecular weight of 120.92. investigated refrigerants R290/R600a of (50%+50%) has the better performance and having the COP about 3.81. Fig 3. Tashtoush, B. et, al. If you want to promote your products or services in the Engineering ToolBox - please use Google Adwords. The freezing point of the refrigerant should be lower than the lowest operating temperature of the cycle to prevent blockage of refrigerant pipelines. R12 and R134a are having highest COP values in this group of refrigerants and these hydrocarbon mixtures also having the COP close to the conventional refrigerants. COP Vs Condenser Temperature at constant Refrigerant Suction Discharge Isentropic Work/cycle Polytropic Pressure Pressure Disch Temp for 1 cu.in disp Exponent psi (kPa) psi (kPa) F (C) in-lbf (J) Low Temperature Applications: Tevap = -10F (-23.3C) Tcond = 120F (48.9C), Treturn gas = 40F (4.44C) R12 19.16 ( 132.10) 171.97 ( 1185.70) 194.08 ( 90.04) 43.16 ( 4.88) 1.091104 The publication presents a set of equations and constants for calculating thermodynamic properties of refrigerants. Specific volume (m^3/kg) Enthalpy (kJ/kg) Entropy (kJ/kg.K) kPa °C: Sat Liq vf: Sat Vap vg: Sat Liq hf: Sat Vap hg: Sat Liq sf: Sat Vap sg: 60-36.9: 0.0007098: 0.3112: 3.9: 227.8: 0.0164: 0.9645: 80-31.1: 0.0007185: 0.2376: 11.3: 231.5: 0.0472: 0.9572: 100-26.4: 0.0007259: 0.1926: 17.3: 234.5: 0.0720: 0.9519: 120-22.3: 0.0007324: 0.1621: 22.5: 237.0: 0.0928: 0.9478: 140-18.8: 0.0007383: 0.1402: … State equation, equation of saturated vapor pressure, equation of liquid volume, equation of specific heat capacity, enthalpy and entropy for R11, R12, R13, R14, R22, R23, R113, R114, R500 and R502 are presented. rate and heat transfer from condenser per unit mass of refrigerant. This ensures ... refrigerants like R12, R500, R22 etc., a reciprocating compressor is suitable. Its critical constants are: T c = 385 K, p c = 41.2 bars, and Z c = (p c v c / R T c ) = 0.278 The saturated liquid at 20 C has a specific heat of 0.96 kJ/ kg.K and at -20 C the specific heat is 0.90 kJ/ kg.K. The difference of specific heat is observed by adding the CuO particles in R11, R12, R22, R134a and R141b at evaporator conditions which works between the pressure range of 0.2-0.4 MPa. Hence, the heat removed from the refrigerant blend not only includes latent If the refrigerants exist in single liquid phase the heat transfer coefficient of R134a is higher by 27 to 37% and if they are in gaseous phase it is higher by 37 to 45%. The comparison is based on coefficient of performance (COP) obtained by the refrigerant in the refrigeration cycle, and various cycle parameters: specific volume, pressure ratio, and discharge temperature. Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro .Add the Engineering ToolBox extension to your SketchUp from the SketchUp Pro Sketchup Extension Warehouse! So if we can get Qc, we can calculate the mass flow rate using = cooling load / Qc Since the evaporator is an open system, we have ∆H = Q + W Abstract. Refrigerants R134a and R12 were used as the test fluids. k = C) for modelling the Freon 12 is the Dupont trade name for flurocarbon refrigerant gas, CCl 2 F 2. Condensation of the refrigerant blend R407C differs from that of a pure refrigerant, such as R134a, in that the isobaric process takes place over a temperature range or glide for the mixture rather than at a fixed saturation temperature as for the pure refrigerant. The publication presents a set of equations and constants for calculating thermodynamic properties of refrigerants. To analyse the variation in specific heat Pak and Cho [10] equation is used. Dichlorodifluoromethane Properties - Imperial Units. ... For saturated state at the inlet to the compressor, a refrigerant having high vapor specific heat may give rise to wet compression . 1 W/ (m K) = 0.85984 kcal/ (h m oC) = 0.5779 Btu/ (ft h oF) = 0.048 Btu/ (in h oF) 1 m2/s = 104 St = 106 cSt = 10.764 ft2/s= 38750 ft2/h. Its advantages are that it is available free of cost, is non-toxic and non-flammable and … R1140) are most hazardous. We don't collect information from our users. Properties of saturated liquid Dichlorodifluoromethane - CCl2F2 - density, specific heat capacity, kinematic viscosity, thermal conductivity and Prandtl number: Dichlorodifluoromethane - R-12 - is a chlorofluorocarbon halomethane used as a refrigerant and aerosol spray propellant. We don't save this data. [5] Have been a performed experimental study on HC / HFC refrigerant mixtures as new alternative refrigerants to replace R12 in domestic refrigerators. Specific heat of liquid at 25oC kJ/kgoC1.43 1.00 1.45 1.35 1.52 1.25 1.26 1.26 Specific heat of vapour at 1 atm & 25 o C kJ/kg o C0.8740.6060.863 0.817 0.703 0.734 0.722 Vapour pressure at 25 o C 3) Heat transfer coefficients: The heat transfer coefficients for refrigerant R134a are higher than R12 in different conditions depending on the temperature. The refrigerants usually works with the temperature range of 190K-269K. The performance of parameters was compared with those of CFC-12 and HFC-R134a refrigerants. In countries operating under "Article" provisions of the Montreal protocol agreement, CFCs in virgin form are still available, although these countries are now beginning to implement CFC phase-outs. Consider R-134a, R-401A, R-401B and R-409A. COMMON REFRIGERANTS: Air: Air (molecular weight 28.97, specific heats cp = 1.04 kJ/kgK and cv = 0.712 kJ/kg-K) is one of the earliest refrigerant to be used in the refrigeration systems. AddThis use cookies for handling links to social media. Specific heat of liquid at 25 oC kJ/kg oC 1.45 1.00 Specific heat of vapour at 1 atm & 25 o C kJ/kg oC 0.863 0.606 Vapour pressure at 25 oC kPa psia 707 (1) 102.6 (1) 643 93.3 Latent heat of vaporisation at boiling point kJ/kg 218 165 Ozone Depletion Potential ODP … 1.b, respectively. There is no major effect of Dichlorodifluoromethane Properties - Imperial Units, en: Dichlorodifluoromethane properties property density thermal conductivity kinematic, es: Propiedades Diclorodifluorometano densidad propiedad cinemática conductividad térmica, de: Dichlorodifluoromethane immobilien Dichte Wärmeleitfähigkeit kinematische. Cp at 230 K is 106.3 J/mol*K. Another common simplification of theoretical models is to adopt the polytropic relationship (Pv. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected. Heat flow rate = mass flow rate * heat flow per unit mass The heat flow per unit mass is Qc and the heat flow rate is the cooling load given in the problem (5 BTU/ hr). U.S. production stopped December 31, 1995. Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! Abstract. (7) becomes: Cp7 (T1 - T7) = Cp4 (T4 - T5) (8) where, Cp4 and Cp7 are values of the specific-heat taken as those of the saturated refrigerant at point 4 and point 7 on Fig. State equation, equation of saturated vapor pressure, equation of liquid volume, equation of specific heat capacity, enthalpy and entropy for R11, R12, R13, R14, R22, R23, R113, R114, R500 and R502 are presented. Study of Coefficient of Heat Transfer of R-1234yf, R-410a as an Alternative Refrigerant to R-134a and . R12 . Consider R-134a, R-401A, R-401B and R-409A. The molecular weight of R12 is 120.9 and its boiling point is -21.6 degree F. Since R12 has the molecules of chlorine and fluorine, it is called as chlorofluorocarbon (CFC). the paper presents a set of equations and constants for calculating thermodynamic properties of refrigerants. Cookies are only used in the browser to improve user experience. You can target the Engineering ToolBox by using AdWords Managed Placements. in air (Based on ASHRAE Standard 34 with Match Ignition). Vijayendra Singh Rajput1, Dr. A. C. Tiwari2 1 Research Scholar, Heat Power Engineering, Department of Mechanical Engineering, Rajiv Gandhi Proudyogiki Vishwavidyalaya, Bhopal, … Here i am talking with respect to vapor compression refrigeration cycle. Heat capacity measured at 230 K and 290 K using two different methods.