Announcements

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 3-36 - 3-45
7
(No Transcript)
8
Changing Pump Speed
9
Net Positive Suction Head(cavitation)
10
Curve for Multiple Pumps
11
System Curves
?p
?p
AB
AB
B
A
B
A
V
A
B
V
A
B
Parallel
Serial
12
Find a system curve for this plumbing
configuration
13
Primary/Secondary and Tertiary Pumping
(schematics AB 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/downloa
ds/cooltools/EDR_DesignGuidelines_CoolToolsChilled
Water.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 http//www.google.com/url?satrctjq
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2Fdownload.php3Ffile3Dhegberg.pdfeiIvcqU_O1KM
uE2AWgloHgDAusgAFQjCNFRAMzPnbzDpAluhyk4l8u_SKKTd
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17
Control Valve Selection For Hydronic Systems
Before DC we tried to do this
Valve authority