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Objectives

Learn about district cooling and heating systems and explore pump and plumbing examples, including system curves, pump types, and valve selection. This resource provides in-depth information on system balancing, primary/secondary pumping, and different types of valves used in hydronic systems.

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Objectives

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  1. Objectives - Learn about district cooling and heating systems - Finish with pumps and plumbing example

  2. System Curves ∆p ∆p A+B A+B B A B A V A B V A B Parallel Serial

  3. System balancing AHU1 AHU2 HC1 HC2 100 ft 1000 ft 10 gpm 2 gpm 10 ft pump BOILER

  4. Pumps • Raise pressure and produce flow • Main type • Centrifugal Example of Turbine pump Base mounted Reading (textbook) Page 3-36 - 3-45 Inline http://www.taylor-engineering.com/downloads/cooltools/EDR_DesignGuidelines_CoolToolsChilledWater.pdf

  5. Curve for Multiple Pumps

  6. Changing Pump Speed

  7. HW5: Find a system curve for this plumbing configuration

  8. Primary/Secondary and Tertiary Pumping Reading Assignment: Taylor, S., P. Dupont, B. Jones, T. Hartman and M. Hydeman. 2000. Chilled water plant design guide. San Francisco: Pacific Gas & Electric Company. http://www.taylor-engineering.com/downloads/cooltools/EDR_DesignGuidelines_CoolToolsChilledWater.pdf

  9. Hydronic systems for district cooling/heating and buildings Constant-Flow System, Single Chiller, Multiple Coils Constant-Flow System, Single Chiller, Single Coil Mixing valve that control by-pass flow Major pumping force is the chiller pump

  10. Control of coil temperature Mixing valve that control the flow through the coil Flow Variation as a Function of Valve Position Same pressure drop like a cooling coil Major pumping force is the chiller pump

  11. Multiple chiller (or boilers) Serial Parallel

  12. Primary-Loop Only VariableSpeed Flow Single chiller Multiple chillers

  13. Primary and Secondary Loop Variable Flow Design Parallel chillers Serial chillers

  14. Large Plant or Building Distribution Systems Primary/Secondary Loops with Variable Flow and Distributed Pumping

  15. Primary/Secondary and Tertiary Pumping

  16. Primary Pump Arrangements Dedicate a pump for each chiller Provide a common header for the pumps

  17. Coil Pumping Strategies Variable speed pumps vs. Single pas Valve vs. Mixing valves vs. Diverting Valves

  18. Impact of plumbing on acooling coil

  19. Plumbing Arrangement in Building’s hydronic systems Radiators Fan coil systems Baseboard heaters

  20. Valves • Section 5-14 and 6-15 in the textbook • Types • Butterfly Valves • Ball Valves • Globe Valves Three way valves

  21. Valve Sizing and Flow Coefficient Cv value: in liter/hour or…. in Pa Control Valve Selection For Hydronic Systems reference: http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0CCUQFjAA&url=http%3A%2F%2Fbookstore.ashrae.biz%2Fjournal%2Fdownload.php%3Ffile%3Dhegberg.pdf&ei=IvcqU_O1KMuE2AWgloHgDA&usg=AFQjCNFRAMzPnbzDpAluhyk4l8u_SKKTdw

  22. Control Valve Selection For Hydronic Systems Before DC we tried to do this Valve authority

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