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System and Component Efficiency with Refrigerant R410a

System and Component Efficiency with Refrigerant R410a. A. T. Setiawan 1 , A. Olsson 2 , H. Hager 2 1 Department of Energy Technology, Div. Of Applied Thermodynamics and Refrigeration, KTH, Stockholm 2 SWEP International AB, Box 105, SE-261 22 Landskrona, Sweden. Overview. Properties of R410A

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System and Component Efficiency with Refrigerant R410a

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  1. System and Component Efficiency with Refrigerant R410a A. T. Setiawan1, A. Olsson2, H. Hager2 1Department of Energy Technology, Div. Of Applied Thermodynamics and Refrigeration, KTH, Stockholm 2SWEP International AB, Box 105, SE-261 22 Landskrona, Sweden

  2. Overview • Properties of R410A • Comparison with other common refrigerants • System characteristics • Experimental test facility • Experimental heat transfer results • Comparison to other data and other refrigerants Div. of Applied Thermodynamics and Refrigeration Department of Energy Technology Royal Institute of Technology, Stockholm

  3. R410aProperties • 50/50 mixture of R32/R125 (CH2F2 – C2HF5) • Glide : Less than 0,1°C (azeotropic) • Comparably high pressure (15 Bars at Tamb) • ODP : 0 % (HFC refrigerant) • GWP : 1730 (compared to CO2) Div. of Applied Thermodynamics and Refrigeration Department of Energy Technology Royal Institute of Technology, Stockholm

  4. R410aVapor Pressure curve Div. of Applied Thermodynamics and Refrigeration Department of Energy Technology Royal Institute of Technology, Stockholm

  5. COP2, comparison of refrigerants (T1=40°C) Div. of Applied Thermodynamics and Refrigeration Department of Energy Technology Royal Institute of Technology, Stockholm

  6. Pressure ratio, comparison of refrigerants (T1=40°C) Div. of Applied Thermodynamics and Refrigeration Department of Energy Technology Royal Institute of Technology, Stockholm

  7. Pro’s Con’s • Low specific volume, lead to smaller piping and other components • No glide (0.1K) • No ODP (Ozone Depleting Potential) • Appropriate for new systems • High pressure, need special components • GWP (Global Warming Potential) • Not appropriate when converting old R22 systems • Low critical temperature (73ºC), limiting the condensation temperature. R410aPro’s and Con’s Div. of Applied Thermodynamics and Refrigeration Department of Energy Technology Royal Institute of Technology, Stockholm

  8. Figures of MeritEvaporation in horizontal tubes Div. of Applied Thermodynamics and Refrigeration Department of Energy Technology Royal Institute of Technology, Stockholm

  9. Figures of Merit Evaporator (examples) Evaporator Pressure Drop Boiling Heat Transfer Div. of Applied Thermodynamics and Refrigeration Department of Energy Technology Royal Institute of Technology, Stockholm

  10. SSP–CBE ModellingRelative CBE size, chiller mode Div. of Applied Thermodynamics and Refrigeration Department of Energy Technology Royal Institute of Technology, Stockholm

  11. SSP–CBE ModellingRelative CBE size, heat pump Div. of Applied Thermodynamics and Refrigeration Department of Energy Technology Royal Institute of Technology, Stockholm

  12. Experimental Test FacilityAvailability of components • Hermetic compressors available (?) up to 150 kW cooling (tandem) • Expansion valve : Limited availability • Copper tubes up to 12 mm, then steel • Sight glass, filter-dryer, valves available • Check valve, oil separator, limited Div. of Applied Thermodynamics and Refrigeration Department of Energy Technology Royal Institute of Technology, Stockholm

  13. Experimental Test FacilityTested heat exchangers • Condenser : • Plate heat exchanger (CBE), 34 plates, 2.0 m2 co-current and counter-current • Evaporator : • Plate heat exchanger (CBE), 34 plates, 2.0 m2 • Plate heat exchanger (CBE), 32 plates, 1.0 m2 both counter-current Div. of Applied Thermodynamics and Refrigeration Department of Energy Technology Royal Institute of Technology, Stockholm

  14. Experimental Test FacilitySchematic view Div. of Applied Thermodynamics and Refrigeration Department of Energy Technology Royal Institute of Technology, Stockholm

  15. Experimental Test FacilityThe Refrigerant loop, schematic Div. of Applied Thermodynamics and Refrigeration Department of Energy Technology Royal Institute of Technology, Stockholm

  16. Evaporator testOperational conditions • Evaporation temp : 2°C • Inlet vapor quality : 20% • DTSuperheat = 4°C • Heat flux range : 8 – 15 kW/m2 • DTBrine = 5°C Div. of Applied Thermodynamics and Refrigeration Department of Energy Technology Royal Institute of Technology, Stockholm

  17. Evaporator testDifferent CBE size Div. of Applied Thermodynamics and Refrigeration Department of Energy Technology Royal Institute of Technology, Stockholm

  18. Condenser testOperational conditions • Condensing temp : 40°C • Compressor discharge temp : 75°C • No subcooling • Heat flux range : 9 – 18 kW/m2 • DTBrine = 5°C Div. of Applied Thermodynamics and Refrigeration Department of Energy Technology Royal Institute of Technology, Stockholm

  19. Condenser testDifferent flow direction Div. of Applied Thermodynamics and Refrigeration Department of Energy Technology Royal Institute of Technology, Stockholm

  20. Evaporator testComparison with literature data Div. of Applied Thermodynamics and Refrigeration Department of Energy Technology Royal Institute of Technology, Stockholm

  21. (R410A) Condenser testComparison with literature data Div. of Applied Thermodynamics and Refrigeration Department of Energy Technology Royal Institute of Technology, Stockholm

  22. Thank you for your attention For more information, please refer to final report. Div. of Applied Thermodynamics and Refrigeration Department of Energy Technology Royal Institute of Technology, Stockholm

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