1. Announcements 1) The take home exam: will be handed out on April 23rd
should be turn in on April 28th
2) Final project due date:
May 12th

2. Lecture Objectives: Learn about plumbing systems
Discuss district heating and cooling systems

3. Pipe Head Loss

4. Fittings

5. Pump curves
NPSHR = Net Positive Suction Head Required

6. Pumps Raise pressure and produce flow Main type Centrifugal Example of
Turbine pump
Base mounted
Inline
Reading (textbook)
Page

8. Changing Pump Speed

9. Net Positive Suction Head (cavitation)

10. Curve for Multiple Pumps

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

12. Find a system curve for this plumbing configuration

13. Primary/Secondary and Tertiary Pumping (schematics A&B below)
Reading Assignment:
Taylor, S., P. Dupont, B. Jones, T. Hartman and M. Hydeman Chilled water plant design guide. San Francisco: Pacific Gas & Electric Company.
engineering.com/downloads/cooltools/EDR_DesignGuidelines_C oolToolsChilledWater.pdf

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

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

16. Valve Sizing and Flow Coefficient
Cv value:
in liter/hour or….
in Pa
Control Valve Selection For Hydronic Systems
reference:

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