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

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

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

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

6. Curve for Multiple Pumps

7. Changing Pump Speed

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

9. Primary/Secondary and Tertiary Pumping 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_C oolToolsChilledWater.pdf Reading Assignment:

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

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

12. Multiple chiller (or boilers) Parallel Serial

13. Primary-Loop Only Variable Speed Flow Single chiller Multiple chillers

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

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

16. Primary/Secondary and Tertiary Pumping

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

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

19. Impact of plumbing on a cooling coil

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

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

22. 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%2Fdow nload.php%3Ffile%3Dhegberg.pdf&ei=IvcqU_O1KMuE2AWgloHgDA&usg=AFQjCNF RAMzPnbzDpAluhyk4l8u_SKKTdw

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