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

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

Pipe Head Loss

Fittings

Pump curves NPSHR = Net Positive Suction Head Required

Pumps Raise pressure and produce flow Main type Centrifugal Example of Turbine pump Base mounted Inline Reading (textbook) Page 3-36 - 3-45

Changing Pump Speed

Net Positive Suction Head (cavitation)

Curve for Multiple Pumps

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

Find a system curve for this plumbing configuration

Primary/Secondary and Tertiary Pumping (schematics A&B below) 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_C oolToolsChilledWater.pdf

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

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

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

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