ME 401 Suction Line Heat Exchangers - PowerPoint PPT Presentation

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ME 401 Suction Line Heat Exchangers

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ME 401 Suction Line Heat Exchangers ME 401 Suction Line Heat Exchangers Exchange heat between the suction gas line and the liquid line The suction gas (exit from the ... – PowerPoint PPT presentation

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Title: ME 401 Suction Line Heat Exchangers


1
ME 401Suction Line Heat Exchangers
2
Rankine Refrigerator EnhancementSuction Line
Heat Exchanger
  • Exchange heat between the suction gas line and
    the liquid line
  • The suction gas (exit from the evaporator) is
    coolapproximately evaporator temperature
  • The liquid line (exit from condenser) is
    warmapproximately ambient temperature
  • Warming (superheating) suction gas increases
    compressor work
  • Cooling liquid line refrigerant increases
    refrigeration capacity
  • If cooling capacity increases faster than
    compressor work, then performance is improved
  • Depends on specific refrigerant characteristics
  • R134a improves in performance (refrigerators)
  • R22 decreases in performance (house air
    conditioners)

3
Rankine Refrigerator Enhancement
  • Basic System
  • No enhancement

4
Rankine Refrigerator Enhancement
  • Suction line heat exchanger
  • Find new points 2 and 4

5
Suction Line Heat Exchange
Note changes in enthalpy across heat exchanger
fluids are equal h2-h2 h4-h4
6
Expansion Valves
Thermostatic expansion valves See description
on http//www.hvacmechanic.com/txv.htm
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