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Best Practice Design

Best Practice Design. Best Practice Design. Optimize Pump Impeller. Why Constant speed pump Variable speed pump. Best Practice Design. Why Equipment over-sizing Cost penalty Mandate by ASHRAE 90.1 when > 10HP. Optimize Pump Impeller. Best Practice Design. Constant speed pump. 4.

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Best Practice Design

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  1. Best Practice Design

  2. Best Practice Design Optimize Pump Impeller • Why • Constant speed pump • Variable speed pump

  3. Best Practice Design Why Equipment over-sizing Cost penalty Mandate by ASHRAE 90.1 when > 10HP Optimize Pump Impeller

  4. Best Practice Design Constant speed pump 4 • Trim the impeller • Utilize the affinity laws • Follow the system curve • Save operating cost • First costs

  5. Best Practice Design Variable speed pump • Impeller optimization • Follows affinity laws • First cost impacts • Does not correct for poor engineering • Over-sized pumps minimize turndown ratio • Over-sized pumps and motors operate at lower efficiencies

  6. Best Practice Design Primary Piping for Hot Water Systems • Pump out of a boiler • Keep the boiler at the lowest possible pressure • Remember NPSH! P2 P1 Boiler 1 Boiler 2

  7. Best Practice Design Primary Piping for Chilled Water Systems • Pump into a chiller • Largest pressure drops after the pump Chiller Chiller Chiller Primary Pumps

  8. Condenser Water Piping Condenser Water Piping Tips • Installation • Maintenance

  9. Condenser Water Piping Condenser Pump Cooling Tower Evaporator Condenser Chiller Sediment and Air Separator 9 • Installation • Pump suction flooded • Watch NPSHa

  10. Condenser Water Piping Cooling Tower Evaporator Condenser Obstacle Chiller Condenser Pump 10 • Operation • Air pockets • End of curve

  11. Condenser Water Piping Cooling Tower Condenser Pump Evaporator Condenser Sediment/Air Separator And Relief Valve: Alternate Locations Chiller 11 • Maintenance • Strainers • Air vents

  12. Best Practice Design System Bypass Options Secondary CS Pump(s) Supply Chiller 2 Chiller 3 Chiller 1 Pump Controller Common Pipe Return

  13. Best Practice Design System Bypass Options • Locate bypass near end of system • Locate bypass near end of major loops • Selectively leave 3-way valves • Bypass with pressure activated control • Variable speed considerations

  14. 120 100 % Speed 110 100 90 80 70 Head 60 30% Speed 50 40 30 20 10 0 % Flow 60 70 80 90 100 0 10 20 30 40 50 Best Practice Design • Below 30% speed: CS, but still VV Effect at program minimum VFD speed

  15. Pump 1 Variable Speed: 500GPM @ 100 Ft 1000 GPM Wrong! Pump 2 Constant Speed: 500 GPM @ 100 Ft 1000 GPM Mixing CS and VS Pumps Best Practice Design

  16. ∆P Sensor Pump Controller Best Practice Design Sensor Location Secondary Pumps Supply Chiller 3 Chiller 1 Chiller 2 VFDs Return Primary Pumps

  17. Best Practice Design Sensor Location • The Traditional Way • Hydronically, the farthest load • Typically the largest, farthest load • Maximize the variable head loss • Multiple sensors are a benefit

  18. Best Practice Design • Optimized solution not only for the pumps, but for the total system conditions • Proportional pressure, calculated • Proportional pressure, measured • FLOWADAPT and AUTOADAPT 18

  19. Best Practice Design • Uncontrolled • Constant pressure • Proportional pressure (calculated) • Proportional pressure (measured) • Temperature control 100 80 60 40 20 0 1. Effect in % H 2. 3. 4. 5. 0 20 40 60 80 100 Flow in % 25% 100% Q Get Additional Energy Savings 19

  20. Best Practice Design - Demand More Total Efficiency vs. Control Modes

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