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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

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

slide2

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

r410a properties
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

r410a vapor pressure curve
R410aVapor Pressure curve

Div. of Applied Thermodynamics and Refrigeration

Department of Energy Technology

Royal Institute of Technology, Stockholm

cop 2 comparison of refrigerants t 1 40 c
COP2, comparison of refrigerants (T1=40°C)

Div. of Applied Thermodynamics and Refrigeration

Department of Energy Technology

Royal Institute of Technology, Stockholm

pressure ratio comparison of refrigerants t 1 40 c
Pressure ratio, comparison of refrigerants (T1=40°C)

Div. of Applied Thermodynamics and Refrigeration

Department of Energy Technology

Royal Institute of Technology, Stockholm

r410a pro s and con s

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

figures of merit evaporation in horizontal tubes
Figures of MeritEvaporation in horizontal tubes

Div. of Applied Thermodynamics and Refrigeration

Department of Energy Technology

Royal Institute of Technology, Stockholm

figures of merit evaporator examples
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

ssp cbe modelling relative cbe size chiller mode
SSP–CBE ModellingRelative CBE size, chiller mode

Div. of Applied Thermodynamics and Refrigeration

Department of Energy Technology

Royal Institute of Technology, Stockholm

ssp cbe modelling relative cbe size heat pump
SSP–CBE ModellingRelative CBE size, heat pump

Div. of Applied Thermodynamics and Refrigeration

Department of Energy Technology

Royal Institute of Technology, Stockholm

experimental test facility availability of components
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

experimental test facility tested heat exchangers
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

experimental test facility schematic view
Experimental Test FacilitySchematic view

Div. of Applied Thermodynamics and Refrigeration

Department of Energy Technology

Royal Institute of Technology, Stockholm

experimental test facility the refrigerant loop schematic
Experimental Test FacilityThe Refrigerant loop, schematic

Div. of Applied Thermodynamics and Refrigeration

Department of Energy Technology

Royal Institute of Technology, Stockholm

evaporator test operational conditions
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

evaporator test different cbe size
Evaporator testDifferent CBE size

Div. of Applied Thermodynamics and Refrigeration

Department of Energy Technology

Royal Institute of Technology, Stockholm

condenser test operational conditions
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

condenser test different flow direction
Condenser testDifferent flow direction

Div. of Applied Thermodynamics and Refrigeration

Department of Energy Technology

Royal Institute of Technology, Stockholm

evaporator test comparison with literature data
Evaporator testComparison with literature data

Div. of Applied Thermodynamics and Refrigeration

Department of Energy Technology

Royal Institute of Technology, Stockholm

condenser test comparison with literature data

(R410A)

Condenser testComparison with literature data

Div. of Applied Thermodynamics and Refrigeration

Department of Energy Technology

Royal Institute of Technology, Stockholm

for more information please refer to final report

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