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Effektivare kylsystem för kyl & och frysskåp Erik Björk, PhD student, KTH

Effektivare kylsystem för kyl & och frysskåp Erik Björk, PhD student, KTH Björn Palm, Supervisor, KTH Per Wennerström, controller, Electrolux/RDE. Background. Black box Rule of thumb design Copy old designs. Energy consumption Legislations Customers demand. condenser. Open box

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Effektivare kylsystem för kyl & och frysskåp Erik Björk, PhD student, KTH

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  1. Effektivare kylsystem för kyl & och frysskåp Erik Björk, PhD student, KTH Björn Palm, Supervisor, KTH Per Wennerström, controller, Electrolux/RDE

  2. Background • Black box • Rule of thumb design • Copy old designs • Energy consumption • Legislations • Customers demand condenser • Open box • Design based on science (heat transfer, pressure drop and charge) • Reduced Energy consumption cap. tube compressor evaporator

  3. The plate evaporator (ER8893C) • Aluminium, 660 x 490 mm • Thickness 1.4 mm • 1.35 kg • White coated • Tube length 6.22 m • Hydraulic diameter 3.2 mm • Total internal volume 115.7 ml • Accumulator volume 45.6 ml

  4. The plate evaporator (ER8893C)

  5. On-off cycling characteristics

  6. Charge distribution – experimental results

  7. Comparison theory - experimental results Evaporator Condenser

  8. Downward slope reduces activation time

  9. Accumulator delays activation

  10. Refrigerant side heat transfer – experimental results Mass flow

  11. Refrigerant side pressure drop – experimental results

  12. Optimum pitch

  13. Fin efficiency for the whole evaporator ≈ 97,2%

  14. Small diameter at inlet – large at outlet Downward sloping channels Distributed accumulator Increased pitch Channels close to plate edges Conclusions improved evaporator design

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