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Lecture Objectives:

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... ft 2 gpm 10 gpm 10 ft Valves Section 5-14 and 6-15 in the textbook Types Butterfly Valves Ball Valves Globe Valves Three way valves Valve Sizing and Flow ... – PowerPoint PPT presentation

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Title: Lecture Objectives:


1
Lecture Objectives
  • Learn about
  • Pumps and
  • System Curves

2
Hydronic Terms
  • Head loss
  • Open-loop vs. closed loop
  • Open System
  • Closed System

h
Pump
Cooling coil in AHU
Chiller
Pump
3
Is this open or closed system ?
Cooling towers
4
Relationship between velocity in a pipe and
pressure drop
?p v2 ?p Constant v2
Required power (P) for the pump
P V ?p P power W,
V volume flow rate m3/s,
v velocity m/s
?p pressure drop Pa
?p v2 (?p V2 when same pipe
is used) P V V2 when same pipe is used P
V3 P2/P1 (V2/V1)3 For the same
pipe When different pipe is used for the same
flow rate For the same flow rate V Reduction of
D
smaller pipe
larger pipe
?p Pa or ft water
P2/P1 (D1/D2)4 - for the same flow rate or
50 smaller diameter of the pipe for the same
flow rate wee have 4 times larger velocity 16
times larger pressure drop and 16 times lager
power for the pump
v m/s or fpm
5
Head Loss
6
Fittings
7
Pumps
  • Raise pressure and produce flow
  • Main type
  • Centrifugal

Example of Turbine pump
Base mounted
Inline
Reading (textbook) Page 3-36 - 3-45
8
Pump curves
  • NPSHR Net Positive Suction Head Required

9
(No Transcript)
10
Changing Pump Speed
11
Net Positive Suction Head(cavitation)
12
Curve for Multiple Pumps
13
System Curves
?p
?p
AB
AB
B
A
B
A
V
A
B
V
A
B
Parallel
Serial
14
Find a system curve for this plumbing
configuration
15
Primary/Secondary and Tertiary Pumping
(schematics AB below)
16
System balancing
AHU1
AHU2
HC1
HC2
100 ft
1000 ft
10 gpm
2 gpm
10 ft
pump
BOILER
17
Valves
  • Section 5-14 and 6-15 in the textbook
  • Types
  • Butterfly Valves
  • Ball Valves
  • Globe Valves
  • Three way valves

18
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
esrcssourcewebcd1cadrjauact8ved0CCUQFj
AAurlhttp3A2F2Fbookstore.ashrae.biz2Fjournal
2Fdownload.php3Ffile3Dhegberg.pdfeiIvcqU_O1KM
uE2AWgloHgDAusgAFQjCNFRAMzPnbzDpAluhyk4l8u_SKKTd
w
19
Control Valve Selection For Hydronic Systems
Before DC we tried to do this
Valve authority
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