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ME421 Heat Exchanger Design

ME421 Heat Exchanger Design. Drain Water Heat Recovery System Project Presentation Group #5. OUTLINE. Problem Definition Available Solutions Proposed Solution Application Data Solution Procedure Results and Discussions Conclusion. PROBLEM DEFINITION. Heat wasted during shower.

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ME421 Heat Exchanger Design

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  1. ME421 Heat Exchanger Design Drain Water Heat Recovery System Project Presentation Group #5

  2. OUTLINE • Problem Definition • Available Solutions • Proposed Solution • Application Data • Solution Procedure • Results and Discussions • Conclusion

  3. PROBLEM DEFINITION Heat wasted during shower

  4. AVAILABLE SOLUTIONS • Gravity Film Heat Exchanger(GFX)

  5. PROPOSED SOLUTION Gasketed Plate Heat Exchanger: • High Area/Volume Ratio • Low Cost compared to GFX • Easy to clean • Flexible Design

  6. APPLICATION DATA

  7. SOLUTION PROCEDURE Initial Assumptions: • Steady state and steady flow processes • Plate dimensions based on MIT 522 [1] Lv, Lh, b, t, Dp, β, Φ • Negligible potential and kinetic energy change • Equal inlet & outlet mass flow rates • Single pass counter flow arrangement • Safety factor

  8. SOLUTION PROCEDURE (Cont’d) Procedure: • Iteration method to find Nt • U Ae Nt G Re Nu h U • Rechecking of Nt using calculated U • Pressure drop and pump power calculations • Comparison of ΔPlimit and ΔPcalculated

  9. RESULTS and DISCUSSIONS Pressure Drop vs Number of Plates (Nt) Pressure Drop (Pa) Nt ranging between 3 and 11

  10. RESULTS and DISCUSSIONS (Cont’d) Heat Recovery vs Chevron Angle (β) Heat Recovery (W) β values : 30 ° ,45 ° ,50 ° ,60 ° ,65°

  11. RESULTS and DISCUSSIONS (Cont’d) Pump Power vs Number of Plates (Nt) Pump Power vs Number of Plates (Nt) Pump Power (W) Pump Power (W) Pump Power (W) Nt ranging between 3 and 11

  12. RESULTS and DISCUSSIONS (Cont’d) Pressure Drop vs Chevron Angle (β) Pressure Drop (Pa) β values : 30 ° ,45 ° ,50 ° ,60 ° ,65°

  13. RESULTS and DISCUSSIONS (Cont’d)

  14. CONCLUSION • Preheated .

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