1 medical office building. 2 occupancy – 400 persons 8 a.m. – 5 p.m. monday - friday building...
TRANSCRIPT
1
Medical Office Building
2
Medical Office Building
• Occupancy – 400 persons• 8 a.m. – 5 p.m. Monday - Friday
• Building Characteristics• Three stories• 40,000 square feet (200’ x 200’) per floor• Standard construction
3
Office Application
4
Office Application
5
Office Application
6
Hot Water Systems
• Primary Pumps• Secondary Pumps• Tertiary Pumps• Heat Recovery Pumps• Air Handlers• Fan Coils• Radiant Floor• Convection Units• Filter Pumps
7
Hot Water Systems
P3P3
Bo
iler
1
Bo
iler
2
Type of PumpsP1 Primary P2 Secondary P3 Tertiary P4 Domestic HWP5 Heat Recovery
P6 Filter
P5
P4
P3
P2
P1
P6
P5
Radiators In-floorFan Coils
Filter System
HWAir Handler withHeat Recovery
HWR
CW
Heat Exchanger
8
VS/VV Hot Water Systems
Return
Supply
SecondaryPumps
Boi
ler
1*
Boi
ler
2*
P1*P2*
*Sequenced
VSP1*VSP2* ΔPSensor
VS Pumpsand Controls
9
Chilled Water Applications
• Primary Pumps• Secondary Pumps• Condenser Water Pumps• Fan Coils• VAV• Air Handlers• Chilled Beams
10
Chilled Water Applications
Type of PumpsP1 Primary P2 Secondary P3 Tertiary P4 Condenser WaterP5 Air HandlersP6 Filter
P2
P6
P5
RadiantFan Coils
Filter System
Air Handlers
Ch
ille
r
ChilledBeams
CoolingTower
CondenserWater
P1
P4
Expansion TankAir Separator
Common Pipe
P3 P3P3
Ch
ille
r
P1
CHW System Differences
• Pumps are typically 3-4 times larger• Condensation concerns• Air separator location• Primary pump location• Open loop system piping
12
Parallel Pumping
• Single pumps versus multiple pumps• Advantages• Common configurations
13
Single vs. Multiple Pump Comparison Single Pump Design
• Higher HP• No redundancy• Less piping• Less maintenance• Less complicated• Higher operating cost
Multiple Pump Design• Lower HP• Redundancy• More piping• More maintenance• More complicated• Lower operating cost
14
Parallel Pumping
Common Configurations – Closed loop systems
50% Duty Pump
50% Duty Pump
(2) 50% Duty Pump
(1) 50% Standby Pump
100% Duty Pump
100% Standby Pump
15
Parallel Pumping
Parallel Pumps - What?
1000 GPM@ 100 Ft
1000 GPM@ 100 Ft
2000 GPM
2000 GPM@ 100 Ft
16
Parallel Pumping
Parallel Pumps - Why? • Parallel pumping provides additive flow at the same point of head.
17
Single Pump Curve
Flow
Head
Pump Curve
Point of Selection
18
Parallel Pump Curve
Head
Flow
Flow 1, Pump 1 Flow 1, Pump 2
Single Pump Curve
Point of Selection Duty Point
Parallel Pump Curve
19
Parallel Pumping
Parallel Pumps - Advantages• Smaller pumps• Smaller motors• Lower operating cost• Standby options• Right size pump operating more often
20
Parallel Pumping
90
80
70
60
50
40
30
20
10
0 10 1009080706050403020
100
% F
ull
Loa
d H
P
% Flow
Parallel C/S2 Pumps
Single C/S
Single ParallelC/S
• Getting more out of your pump!
21
Parallel Pumping
Pump 1 selection:500 gpm @ 100 ft
Pump 1 & 2 selection:1000 gpm @ 100 ft
Pump 1 operation:820 gpm @ 68 ft
System Curve
Operation Beyond Selection Point
22
Parallel Pumping Review
Selection Criteria•Select pumps for 50% of total flow (500 gpm, each)•Make sure each pump can cross system curve
Parallel Pump Advantage•Pump runs out to 820 gpm•Operate one pump for ≥ 80% of the time•Save operational cost!
23
Parallel Pumping Cautions
• Pumps too smallo End of curve
• Unequal sized pumpso Erratic operation
Improper parallel pump selection
24
Parallel Pumping Caution
0 200 400 600 800 1000 1200 1400Flow (gpm)
150
120
90
60
30
0
Pump 1 Pump 2 Pump 3
System Curve
Pump 1 selection:333 gpm @ 90 ft
Pump 1& 2 selection:666 gpm @ 90 ft
Pump 1, 2, &3 selection:1000 gpm @ 90 ft
Head (
ft)
End of Curve
25
Parallel Pump Caution
Unequal Size Pump Selection
26
Sequencing Parallel Pumps
Pump sequencing methods:‒ Head‒ Differential Head‒ Temperature‒ Flow‒ Current sensing
27
Sequencing Parallel Pumps
P1
P1&2
Staging point
Duty point
40
35
30
25
20
15
10
5
0
Head (
ft)
0 100 200 300 400 500 600 700 Flow (gpm)
28
Parallel Pumping
Parallel pumps - Operation• How many can you add?
• Practical limit – 6 pumps
29
Maximum Number of Parallel Pumps
P2P1
P4P3 P5 P7P6
Parallel VS Operation
30
Point E Point D
Point C
Point B
Point A
31
VS/VV Pumping
Add:• Variable frequency drive (VFD)• Programmable logic controller (PLC)• Differential pressure sensors (∆P)• Direct digital controls (DDC)
Save operating cost versus CS/CV system!
32
VS/VV Pump Energy Consumption
CS/CV
CS/VV
VS/VV
33
VS/VV Pumping
Add:• Variable frequency drive (VFD)• Programmable logic controller (PLC)• Differential pressure sensors (∆P)• Direct digital controls (DDC)
Or add…
34
Demand More
Magna3!
35
Demand More – Intelligent Control
Traditional methods• Previously discussed
Sequencing Parallel Pumps
36
Demand More - Intelligent Control
Optimized solution not only for the pumps, but for the total system conditions
• Uncontrolled (constant volume) curve• Constant pressure• Proportional pressure• Temperature control• FLOWADAPT
• AUTOADAPT
37
Demand More - Intellegent Control
Q100%25%
H
1. Uncontrolled
2. Constant pressure
3. Proportional pressure (calculated)
4. Proportional pressure (measured)
5. Temperature control
0 20 40 60 80 100
100
80
60
40
20
0
Flow in %
Eff
ect
in % 1.
2.
3.4.
5.
Get Additional Energy Savings
38
Demand More – Life Cycle Costing