Oct 2010 ASHRAE PICV Presentation

8/15/2019 Oct 2010 ASHRAE PICV Presentation

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PICV Seminar


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AgendaAgenda

1 . Pr e c i s io n

2 . S im p l e

3 . Fl e x i b l e

4 . En e r g y s a v i n g s

5 . Su m m a r y

extra Re f e r e n ce s

1 . Pr e c i s io n

2 . S im p l e

3 . Fl e x i b l e

4 . En e r g y s a v i n g s

5 . Su m m a r y

extra Re f e r e n ce s


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1. Precision1. Precision


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WhatWhat is PICV?is PICV?

Two in one

Simple setting

Perfect balance

Perfect control

Cost saving

Compact design

Two in one

Simple setting

Perfect balance

Perfect control

Cost saving

Compact design

PrecisionPrecision


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A control valve…AA controlcontrol valvevalve……

How does it work?How does it work?

PrecisionPrecision

...and a differential pressure controller...and a...and a differentialdifferential pressurepressure controllercontroller


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The differential pressure controller keeps a

constant pressure across the control valve

TheThe differentialdifferential pressurepressure controllercontroller keepskeeps aa

constantconstant pressurepressure acrossacross thethe controlcontrol valvevalve


Cv x √∆pCCv xv x √∆√∆ppconstantconstantconstantQ =Q =Q =

PrecisionPrecision


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So, stable control with maximal precisionSoSo,, stablestable controlcontrol withwith maximalmaximal precisionprecision


Conclusion:

Constant ∆p across the control valve, resulting in accurateflow limitation and 100% authority.

PrecisionPrecision


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Facts:Long stroke

No 100% authority each setting

Facts:Long stroke

No 100% authority each setting

PICV designconcept A (example AB-QM)PICV designconcept A (example AB-QM)PICV conceptdesign BPICV conceptdesign B

MMM

PrecisionPrecision

Facts:limiting the stroke

100% authority at each setting

Facts:limiting the stroke

100% authority at each setting


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PICV concept BPICV concept BPICV concept APICV concept A

MMMMMM

M

10V

0V

M

10V

0V

PrecisionPrecision


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Uitleg:

-100% autoriteit

-door verkorten van slaglengte

Test and research organisation BSRIAtested different PICV Brands !Test and research organisation BSRIATest and research organisation BSRIAtested different PICV Brands !tested different PICV Brands !

PrecisionPrecision


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AvailibilityAvailibility

Types ½ “ till 10”

Control flow from 0.8 GPM till 1232 GPM

Types ½ “ till 10”

Control flow from 0.8 GPM till 1232 GPM

8” – 10” 88” ” –– 1010” ” 1/2”- 1 ¼” 1/21/2” ” -- 11 ¼” ¼” 1 ½” – 4” 11 ½” ½” –– 44” ” 5” – 6” 55” ” –– 66” ”

PrecisionPrecision

New !New !New !


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2. Simple2.Simple


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07/10/2010 13

SelectionSelection

Selection is dependent only on the flow

No calculation

Selection is dependent only on the flow

No calculation

66 GPM

2 ½”3”

SimpleSimple


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CalculateCalculate the setting:the setting:

QQmaximummaximum (AB(AB--QM)QM) _____________ _____________ QQDesignDesign XX 100%100%

Setting /Setting / SelectionSelection

ExampleExample::

Design =Design = 2.4 GPM2.4 GPM

½”½” valvevalve,,

maxmax flowflow = 4 GPM= 4 GPM

SimpleSimple


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CalculationCalculation::

2.4/4 x 100% =2.4/4 x 100% =

60%60%

Setting /Setting / selectionselection

Simple:

In the whole range settingis done on percentage !

Simple:Simple:

In the whole range settingIn the whole range setting

is done on percentage !is done on percentage !

SimpleSimple


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PICV saves money at every stage:PICV saves money at every stage:

Calculation

Installation / Commissioning

Daily use

Calculation

Installation / Commissioning

Daily use

SimpleSimple


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CalculationCalculation

NoNo CCvv calculationscalculations neededneeded !!

v

pC Flow Δ=

SimpleSimple


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Save money on calculationsSave money on calculations

A=Δp open valve

Δp closed valve

(x 100%)

Recommendation: A > 0.5

Time saving on calculation: No Authority calculationsneeded, just selection

Time saving on calculation: No Authority calculationsneeded, just selection

To calculate a normal control valve you need to size theCv value and the Authority

To calculate a normal control valve you need to size theCv value and the Authority

SimpleSimple


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Savings during installation/commissioningSavings during installation/commissioning

Possible savings:

• Installation time ½” valve

approx. 70 minutes

• Installation time 1 ½” approx. 80 minutes

• Installation time 3” approx. 120minutes

• Commissioning (normally atleast 15 min./valve)

Possible savings:

• Installation time ½” valve

approx. 70 minutes

• Installation time 1 ½” approx. 80 minutes

• Installation time 3” approx. 120minutes

• Commissioning (normally atleast 15 min./valve)

Terminal Unit

SimpleSimple


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InIn variablevariable flowflow systemssystems thethe

availableavailable differentialdifferential pressurepressure

variesvaries

Savings during daily useSavings during daily use

SimpleSimple


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BecauseBecause ofof thisthis thethe

roomtemperatureroomtemperature willwill fluctuatefluctuate

and the actuator has toand the actuator has to

compensatecompensate for for thatthat


SimpleSimple


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Because the PICV

automatically corrects for

varying pressures…

BecauseBecause the PICVthe PICV

automaticallyautomatically correctscorrects for for

varyingvarying pressurespressures……


SimpleSimple


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… the actuator needs

much less movements to

maintain a constant

roomtemperature.

…… the actuatorthe actuator needsneeds

muchmuch lessless movementsmovements toto

maintainmaintain a constanta constant

roomtemperatureroomtemperature..


SimpleSimple


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So: More stable

roomtemperatures and a

longer actuator life span.

SoSo: More: More stablestable

roomtemperaturesroomtemperatures and aand a

longer longer actuatoractuator lifelife span.span.


SimpleSimple


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3. Flexible3. Flexible


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Fancoil unit cooling heating Fancoil unit cooling heating

PICVPICV applicationsapplications

FlexibleFlexible


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PICVPICV applicationsapplications

• AHU cooling/heating•• AHUAHU coolingcooling / /heatingheating

FlexibleFlexible


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4. En e r g y s a v i n g s 4. En e r g y s a v i n g s


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SavingsSavings

Efficient

production of heat/cool

Efficient pumping

Efficient temperturecontrol

Valves cost is typcally lessthen 2% of total investment

in mechanical equipment,

however sound hydronic

yields high efficency of

capital investment.

Energy SavingsEnergy Savings


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Energy saving potentialEnergy saving potential

40%

30%

25%

5%

Chiller

Fans

Pumps

Other

Avoid low dt

syndrome

Variable primary –

more efficient

chiller operation

Variable flow

Dynamic flow

limitation

Better temperature

control allow higheraverage temperature –

thus decrease total

energy usage



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Ashrae ArticleAshrae Article

Facts*:

Most (80%) of complaint are of thermal sensation nature.

In average 20% of maintenance cost are due to solving those complaints.

According to survey made on 280 th m2, with 7.500 occupants there were 2300complaints out of which 1650 were thermal sensation caused by poor controlperformance and HVAC faults. In average 1,8 hours of maintenance work wasspend for one complaint, meaning almost 3.000 man hours per year – in thisparticular case 20% of all energy costs.

*Extracts from article: Predicting the Frequency and Cost of Hot and Cold Complaints inBuildings,Clifford C. Federspiel, Ph.D., Associate Member ASHRAE

Facts*:

Most (80%) of complaint are of thermal sensation nature.

In average 20% of maintenance cost are due to solving those complaints.

According to survey made on 280 th m2, with 7.500 occupants there were 2300complaints out of which 1650 were thermal sensation caused by poor controlperformance and HVAC faults. In average 1,8 hours of maintenance work wasspend for one complaint, meaning almost 3.000 man hours per year – in thisparticular case 20% of all energy costs.

*Extracts from article: Predicting the Frequency and Cost of Hot and Cold Complaints inBuildings,Clifford C. Federspiel, Ph.D., Associate Member ASHRAE



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Temparature control performanceTemparature control performance

Benefits of good temperature control can be seen in:

• Less claims and cost related to them

• Energy savings due to improved temperature setting policy thatallows smaller temperature difference between building and itssurounding

Benefits of good temperature control can be seen in:

• Less claims and cost related to them

• Energy savings due to improved temperature setting policy thatallows smaller temperature difference between building and itssurounding



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σmean temperature σ


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Better control means

less possibility for claim

Better control means

allows to change settingpolicy keeping same

claim ratio but increase

mean temperature and

thus reduce heat

transfer fromsurrounding

A

C

DB


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Standard deviation of room temperature

N u m b e r o f c o m p l a i n t s

Slow rate of change

Fast rate of change

Result of survey - Predicting complaints

Good

Bad



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Diagnostic Logger

Coil Water

TempIn & Out

Air Temp In Air Temp Out

AB-QM Energy SavingsAB-QM Energy Savings


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watersensor

airsensor

data

logger

Data loggerData logger



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Set up Hydronic AnalyzerSet up Hydronic Analyzer

FCU /AHU

AB-QM

M

Traditional controlvalve with circuitsetter

FCU /AHU



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SavingsSavings

Savings as a result of the cases compares to

conventional solution:

• Pump: from 10% to 50%

• Control performance: 5 to 10% on total energy• Chiller/boiler: 10 to 25% increased efficiency

Savings as a result of the cases compares to

conventional solution:

• Pump: from 10% to 50%

• Control performance: 5 to 10% on total energy• Chiller/boiler: 10 to 25% increased efficiency


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5. Summary5. Summary


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SummarySummary

1 . Pr e c i s i o n

100% authority at each flow(setting)

Accurate at low P

2 . Si m p l e

Easy selection

No calculation on kv and authority needed.

Only setting the flow

3 . Fl e x i b le

For each application we have a sollution

4 . En e r g y sa v i n g s

With PICV can be saved on energy, so money

1 . Pr e c i s i o n

100% authority at each flow(setting)

Accurate at low P

2 . Si m p l e

Easy selection

No calculation on kv and authority needed.

Only setting the flow

3 . Fl e x i b le

For each application we have a sollution

4 . En e r g y sa v i n g s

With PICV can be saved on energy, so money


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6. Re f e r e n ce s 6. Re f e r e n ce s


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Rabobank HQ,The Netherlands

World Expo PerformanceCenter, Shanghai, China

Airbus Hangar, France

Deutsche Bank, Germany

Head office of W.SAtkins, Dubai -

United Arab Emirates

Sea Towers Gdynia,

Poland

South DanishUniversity, Denmark

AB-QM ReferencesAB-QM References

UMKC Student Union Building,

Kansas City, United States


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Questions?Questions?

Oct 2010 ASHRAE PICV Presentation

Documents

Transcript of Oct 2010 ASHRAE PICV Presentation