Opteon XP40. Thermodynamic Properties

Transcription

1 Thermodynamic Properties

2 This bulletin presents thermodynamic data for (R-449A), a non-flammable, low GWP hydrofluoro-olefin based refrigerant. (R-449A) is a near azeotrope blend of HFC-32/HFC-125/HFO-1234yf/HFC-134a. This data is intended to help engineers and designers of refrigeration systems calculate system performance. For additional information on the transport properties of please contact please contact your local DuPont representative. The data presented in this bulletin is generated using REFPROP and is based on extensive experimental measurements for both the pure components and the refrigerant blend. Properties ASHRAE Number R-449A Composition wt.-% R-32/R-125/R-1234yf/R-134a 24.3/24.7/25.3/25.7 Molecular Weight 87.2 g/mol Boiling 1 atm (101.3 kpa) C Critical Pressure 4447 kpa Critical 81.5 C Liquid 21.1 C kg/m 3 Ozone Depletion Potential (CFC-11 = 1.0) 0 Global Warming Potential (AR4 & CO2 = 1.0) 1397 ASHRAE Safety Classification A1 System erature Glide app. 4 K Units and Factors Pf = pressure of saturated liquid (bubble point) in kpa (abs) Pg = pressure of saturated vapor (dew point) in kpa (abs) Vf = volume of saturated liquid in m 3 /kg Vg = volume of saturated vapor in m 3 /kg V = volume of superheated vapor in m 3 /kg df = 1/Vf =density of saturated liquid in kg/m 3 dg = 1/Vg = density of saturated vapor in kg/m 3 Hf = enthalpy of saturated liquid in kj/kg Hfg = enthalpy of vaporization in kj/kg Hg = enthalpy of saturated vapor in kj/kg Sf = entropy of saturated liquid in kj/kg.k Sg = entropy of saturated vapor in kj/kg.k S = entropy of superheated vapor in kj/kg.k 1) REFPROP 9.1 refers to the NIST Reference Fluid Thermodynamic and Transport Properties Database. 2

3 0 m Reference State The reference state for the data presented in this bulletin is that recommended by the International Institute of Refrigeration (IIR) where the enthalpy and entropy of the liquid at 0 ⁰C is 200 kj/kg and 1.0 kj/(kg-k) respectively. Equation of State and Other Property Models Details of the equations and models used in REFPROP can be found in the following location: Components Opteon XP40 (R-449A) is a near azeotrope blend of HFC-32/HFC-125/HFO-1234yf/HFC-134a in the mass fraction ratio 24.3/24.7/25.3/25.7. All components of this blend are found in the standard version of REFPROP 9.1 or later which is available from NIST. 2 Interaction Parameters To generate the properties of the blended fluid there are a set of mixing rules implemented within REFPFOP. 3 For each binary blend there is a set of propriety interaction parameters that are used in these mixing rules. For further information on these parameters and their use with REFPROP, please contact your local DuPont representative. Pressure Enthalpy Diagram A pressure enthalpy diagram (s. below) is available to download from Alternatively DUPREX, the DuPont Refrigerant Expert calculation software may also be downloaded from and used to calculate thermodynamic cycle data, property data and pressure drop data. Pressure (MPa) DuPont TM Pressure-Enthalpy Diagram (SI Units) volume = m 3 /kg erature=-30 o C 0.9 saturated liquid quality= erature=0 o C C.P. Enthalpy (kj/kg) saturated vapor entropy=1.95 kj/(kg-k) volume=0.003 m 3 /kg Pressure (Bar) 2) National Institute of Standards and Technology, Gaithersburg, MD, USA. 3) More details of these mixing rules are given in 3

4 Saturation Properties erature Table REFPROP Pressure Volume Density Enthalpy Entropy [kpa] [m3/kg] [kg/m3] [kj/kg] [kj/(kg.k)] C C Liquid p f Vapour p g Liquid v f Vapour v g Liquid d f Vapour d g Liquid H f Latent H fg Vapour H g Liquid S f Vapour S g

5 Saturation Properties erature Table REFPROP Pressure Volume Density Enthalpy Entropy [kpa] [m3/kg] [kg/m3] [kj/kg] [kj/(kg.k)] C C Liquid p f Vapour p g Liquid v f Vapour v g Liquid d f Vapour d g Liquid H f Latent H fg Vapour H g Liquid S f Vapour S g

6 Saturation Properties erature Table REFPROP Pressure Volume Density Enthalpy Entropy [kpa] [m3/kg] [kg/m3] [kj/kg] [kj/(kg.k)] C C Liquid p f Vapour p g Liquid v f Vapour v g Liquid d f Vapour d g Liquid H f Latent H fg Vapour H g Liquid S f Vapour S g

7 Saturation Properties erature Table REFPROP Pressure Volume Density Enthalpy Entropy [kpa] [m3/kg] [kg/m3] [kj/kg] [kj/(kg.k)] C C Liquid p f Vapour p g Liquid v f Vapour v g Liquid d f Vapour d g Liquid H f Latent H fg Vapour H g Liquid S f Vapour S g

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