BibTex RIS Cite
Year 2018, Volume: 5 , 9 - 14, 07.09.2018
https://doi.org/10.17350/HJSE19030000114

Abstract

References

  • Chen ZJ, Lin W. Dynamic simulation and optimal matching of a small-scale refrigeration system. International Journal of Refrigeration 14 (1991) 329-335.
  • Fu L, Ding G, Zhang C. Dynamic simulation of air-to-water dual-mode heat pump with screw compressor. Appl.ied Thermal Engineering 23 (2003) 1629-1645.
  • Madani H, Claesson J, Lundqvist P. Capacity control in ground source heat pump systems part II: Comperative analysis between on/off controlled and variable capacity systems. International Journal of Refrigeration 34 (2011) 1934-1942.
  • Zhu Y, Jin X, Du Z, Fan B, Fu S. Generic simulation model of multi-evaporator variable refrigerant flow air conditioning system for control analysis. International Journal of Refrigeration 36 (2013) 1602-1615.
  • Mota-Babiloni A, Navarro-Esbri J, Barraggan A, Moles F, Peris B. Drop-in energy performance evaluation of R1234yf and R1234ze(E) in a vapor compression system as R134a replacements. Applied Thermal Engineering 71 (2014) 259- 265.
  • Belman-Flores JM, Rodriguez-Munoz AP, Perez-Reguera G, Mota-Babiloni A. Experimental study of R1234yf as a drop-in replacement for R134a in a domestic refrigerator. International Journal of Refrigeration 81 (2017) 1-11.
  • Güngör KE, Winterton RHS. A general correlation for flow boiling in tubes and annuli. International Journal of Heat and Mass Transfer 29 (1985) 351-358.
  • Travis DP, Baron AG, Rohsenow WM. Forced-convection condensation inside tubes. MIT Heat Transfer Laboratory, 74, 1971.
  • Gnielinski V. New equations for heat and mass transfer in turbulent pipe and channel flow. International Journal of Chemical Engineering 16 (1976) 359-368.
  • James KA, James RW. Transient analysis of thermostatic expansion valves for refrigeration system evaporators using mathematical models. Transactions of the Institute of Measurement and Control 9 (1987) 350-355.
  • Tillner-Roth R, Baehr HD. A international standard formulation for the thermodynamic properties of 1,1,1,2-Tetrafluoroethane (HFC-134a) for temperatures from 170K to 455K and pressures up to 70 MPa. Journal of Physical & Chemical Reference Data 23 (1994) 657-729.
  • Richter M, McLinden MO, Lemmon EW. Thermodynamic properties of 2,3,3,3-Tetrafluoroprop-1-ene (R1234yf): Vapor pressure and p-ρ-T measurement and equation of state. Journal of Chemical & Engineering Data 56 (2011) 3254-3264.
  • Wagner W, Pruρ A. The IAPWS formulation 1995 for the thermodynamic properties of ordinary water substance for general and scientific use. Journal of Physical & Chemical Reference Data 31 (2002) 387-535.

Dynamic Performance Comparison of R134a and R1234yf Refrigerants for a Vapor Compression Refrigeration Cycle

Year 2018, Volume: 5 , 9 - 14, 07.09.2018
https://doi.org/10.17350/HJSE19030000114

Abstract

M achines like air conditioners and refrigerators, which cause significant energy consumption in countries around the world, are widely used in industry and residences. Analyzing and studying the behavior of these machines with computer simulations can optimize performance of them. In this study, thermodynamic modelling and dynamic simulation of a vapor compression refrigeration cycle is handled. R134a and R1234yf are used as the primary fluid and water is used as the secondary fluid in the refrigeration cycle. R1234yf is a refrigerant, which has low Global Warming Potential GWP and Ozone Depletion Potential ODP and is recently has been begun to use as a substitute of R134a. In this study, dynamic behaviors of these two refrigerants are examined in a vapor compression refrigerant cycle with fixed operating conditions. Finite Difference Method is utilized for the modelling of the evaporator and condenser and Gungrr-Winterton and Travis et al. correlations are used for the modelling of the evaporation and condensation proccesses respectively. Orifice equation is utilized for the modelling of the expansion valve and modelling of the compressor is carried out by first dynamically simuating the heat transfer between the gas and surroundings until the gas reaches to compression chamber and after that the polytropic compression process in the chamber. For the realization of the dynamical simulation, refrigerant fluid mass flow rate is applied to the system as step input. Response of the system to the input is observed with transient p-h and coefficient of performance COP diagrams. The results showed that COP is started off with the values of 2.079 for R134a and 1.711 R1234yf, reached the maximum points of 2.577 for R134a and 2.02 for R1234yf, then slowly declined with fluctuations. In the p-h diagram, due to temperature rise of inner walls of the evaporator and condenser, condenser outlet and compressor inlet enthalpy values started off with 395,945 kJ/kg and 231,714 kJ/kg for R134a, 361,557 kJ/kg and 230,750 kJ/kg for R1234yf, then approached to the saturation curve with time and reached the values of 393,957 kJ/kg and 233,808 kJ/kg for R134a, 359,547 kJ/kg and 231,917 kJ/kg for R1234 yf

References

  • Chen ZJ, Lin W. Dynamic simulation and optimal matching of a small-scale refrigeration system. International Journal of Refrigeration 14 (1991) 329-335.
  • Fu L, Ding G, Zhang C. Dynamic simulation of air-to-water dual-mode heat pump with screw compressor. Appl.ied Thermal Engineering 23 (2003) 1629-1645.
  • Madani H, Claesson J, Lundqvist P. Capacity control in ground source heat pump systems part II: Comperative analysis between on/off controlled and variable capacity systems. International Journal of Refrigeration 34 (2011) 1934-1942.
  • Zhu Y, Jin X, Du Z, Fan B, Fu S. Generic simulation model of multi-evaporator variable refrigerant flow air conditioning system for control analysis. International Journal of Refrigeration 36 (2013) 1602-1615.
  • Mota-Babiloni A, Navarro-Esbri J, Barraggan A, Moles F, Peris B. Drop-in energy performance evaluation of R1234yf and R1234ze(E) in a vapor compression system as R134a replacements. Applied Thermal Engineering 71 (2014) 259- 265.
  • Belman-Flores JM, Rodriguez-Munoz AP, Perez-Reguera G, Mota-Babiloni A. Experimental study of R1234yf as a drop-in replacement for R134a in a domestic refrigerator. International Journal of Refrigeration 81 (2017) 1-11.
  • Güngör KE, Winterton RHS. A general correlation for flow boiling in tubes and annuli. International Journal of Heat and Mass Transfer 29 (1985) 351-358.
  • Travis DP, Baron AG, Rohsenow WM. Forced-convection condensation inside tubes. MIT Heat Transfer Laboratory, 74, 1971.
  • Gnielinski V. New equations for heat and mass transfer in turbulent pipe and channel flow. International Journal of Chemical Engineering 16 (1976) 359-368.
  • James KA, James RW. Transient analysis of thermostatic expansion valves for refrigeration system evaporators using mathematical models. Transactions of the Institute of Measurement and Control 9 (1987) 350-355.
  • Tillner-Roth R, Baehr HD. A international standard formulation for the thermodynamic properties of 1,1,1,2-Tetrafluoroethane (HFC-134a) for temperatures from 170K to 455K and pressures up to 70 MPa. Journal of Physical & Chemical Reference Data 23 (1994) 657-729.
  • Richter M, McLinden MO, Lemmon EW. Thermodynamic properties of 2,3,3,3-Tetrafluoroprop-1-ene (R1234yf): Vapor pressure and p-ρ-T measurement and equation of state. Journal of Chemical & Engineering Data 56 (2011) 3254-3264.
  • Wagner W, Pruρ A. The IAPWS formulation 1995 for the thermodynamic properties of ordinary water substance for general and scientific use. Journal of Physical & Chemical Reference Data 31 (2002) 387-535.

Details

Primary Language English
Journal Section Research Article
Authors

Mert Sinan TURGUT This is me

Mustafa Turhan ÇOBAN This is me

Publication Date September 7, 2018
Published in Issue Year 2018 Volume: 5

Cite

Vancouver TURGUT MS, ÇOBAN MT. Dynamic Performance Comparison of R134a and R1234yf Refrigerants for a Vapor Compression Refrigeration Cycle. Hittite J Sci Eng. 2018;5:9-14.

Hittite Journal of Science and Engineering is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY NC).