1 medical office building. 2 occupancy – 400 persons 8 a.m. – 5 p.m. monday - friday building...

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Medical Office Building

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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

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Office Application

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Office Application

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Office Application

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Hot Water Systems

• Primary Pumps• Secondary Pumps• Tertiary Pumps• Heat Recovery Pumps• Air Handlers• Fan Coils• Radiant Floor• Convection Units• Filter Pumps

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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

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VS/VV Hot Water Systems

Return

Supply

SecondaryPumps

Boi

ler

1*

Boi

ler

2*

P1*P2*

*Sequenced

VSP1*VSP2* ΔPSensor

VS Pumpsand Controls

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Chilled Water Applications

• Primary Pumps• Secondary Pumps• Condenser Water Pumps• Fan Coils• VAV• Air Handlers• Chilled Beams

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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

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Parallel Pumping

• Single pumps versus multiple pumps• Advantages• Common configurations

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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

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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

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Parallel Pumping

Parallel Pumps - What?

1000 GPM@ 100 Ft

1000 GPM@ 100 Ft

2000 GPM

2000 GPM@ 100 Ft

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Parallel Pumping

Parallel Pumps - Why? • Parallel pumping provides additive flow at the same point of head.

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Single Pump Curve

Flow

Head

Pump Curve

Point of Selection

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Parallel Pump Curve

Head

Flow

Flow 1, Pump 1 Flow 1, Pump 2

Single Pump Curve

Point of Selection Duty Point

Parallel Pump Curve

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Parallel Pumping

Parallel Pumps - Advantages• Smaller pumps• Smaller motors• Lower operating cost• Standby options• Right size pump operating more often

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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!

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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

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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!

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Parallel Pumping Cautions

• Pumps too smallo End of curve

• Unequal sized pumpso Erratic operation

Improper parallel pump selection

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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

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Parallel Pump Caution

Unequal Size Pump Selection

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Sequencing Parallel Pumps

Pump sequencing methods:‒ Head‒ Differential Head‒ Temperature‒ Flow‒ Current sensing

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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)

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Parallel Pumping

Parallel pumps - Operation• How many can you add?

• Practical limit – 6 pumps

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Maximum Number of Parallel Pumps

P2P1

P4P3 P5 P7P6

Parallel VS Operation

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Point E Point D

Point C

Point B

Point A

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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!

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VS/VV Pump Energy Consumption

CS/CV

CS/VV

VS/VV

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VS/VV Pumping

Add:• Variable frequency drive (VFD)• Programmable logic controller (PLC)• Differential pressure sensors (∆P)• Direct digital controls (DDC)

Or add…

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Demand More

Magna3!

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Demand More – Intelligent Control

Traditional methods• Previously discussed

Sequencing Parallel Pumps

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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

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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

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Demand More – Life Cycle Costing