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ME444 ENGINEERING PIPING SYSTEM DESIGN

ME444 ENGINEERING PIPING SYSTEM DESIGN. CHAPTER 10 : CONTROL VALVES IN CLOSED LOOP SYSTEMS. CONTENT. CIRCULATION SYSTEM CONTROL VALVES SELECTION PROCESS. 1. CIRCULATION SYSTEM. Air Handling Unit (AHU). Expansion tank. Cooling Tower. Chilled Water Pump. Chiller. Condenser Water Pump.

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ME444 ENGINEERING PIPING SYSTEM DESIGN

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  1. ME444 ENGINEERING PIPING SYSTEM DESIGN CHAPTER 10 : CONTROL VALVES IN CLOSED LOOP SYSTEMS

  2. CONTENT • CIRCULATION SYSTEM • CONTROL VALVES • SELECTION PROCESS

  3. 1. CIRCULATION SYSTEM Air Handling Unit (AHU) Expansion tank Cooling Tower Chilled Water Pump Chiller Condenser Water Pump

  4. CHILLED WATER/CONDENSER WATER PUMPS

  5. CHILLERS/ COOLING TOWERS

  6. AIR HANDLING/ FANCOIL UNITS

  7. EXPANSION TANKS

  8. REQUIRED FLOW

  9. CHILLED WATER CIRCULATION CHILLER

  10. PRIMARY/SECONDARY SYSTEM

  11. BASIC EQUATION BERNOULLI EQUATION TOTAL PRESSURE = VELOCITY PRESSURE + STATIC PRESSURE ENERGY GRADE LINE = VELOCITY PRESSURE + STATIC PRESSURE + ELV HYRRAULIC GRADE LINE = STATIC PRESSURE + ELEVATION

  12. LOSS MAJOR LOSS: PRESSURE DROP IN PIPE MINOR LOSS: PRESSURE DROP IN FITTINGS AND VALVES

  13. CLOSED LOOP SYSTEM 1 2 3 4 20 GPM 40 30 35 UNBALANCED PRESSURE DROP FOR EACH CIRCUIT

  14. BALANCE THE PRESSURE DROP 1 2 3 4 BALANCING VALVE, CONTROL VALVE OR REGULATOR

  15. REVERSE RETURN DESIGN

  16. TWO WAY VS. THREE WAY VALVE variable flow rate constant flow rate

  17. 2. CONTROL VALVES (A) PROCESS CONTROLLING (B) REGULATING, FLOW BALANCING DO NOT USE SUITABLE

  18. CONTROL VALVE Cv AND Kv QIN GPM DPIN PSI S.G. = SPECIFIC GRAVITY QIN CU.M./HR DPIN BAR S.G. = SPECIFIC GRAVITY Kv = 0.86 x Cv

  19. VALVE CHARACTERISTIC

  20. CONTROL VALVE CONSTRUCTION

  21. CONTROL VALVE RANGE

  22. 3. SELECTION PROCESS Pump capacity: 900lpm@30m.WG.

  23. Size the Pipes

  24. Compute Pressure Drops

  25. Valve Selection

  26. VALVE AUTHORITY PRESSURE DROP AT VALVE VALVE AUTHORITY = OVERALL PRESSURE DROP EXPECT 30%-40% AUTHORITY LARGE PIPES + HIGH HEAD PUMP LEAD TO HIGH AUTHORITY

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