Danfoss Training Module 2 v3 Balancing Valves Compressed

8/20/2019 Danfoss Training Module 2 v3 Balancing Valves Compressed

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C O M F O R T C O N T R O L S -

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Introduction

Danfoss Training Module-2

* * * * * *

Balancing Valves for Heating

and Cooling Systems

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Introduction

Hello and welcome to Danfoss trainingmodule

‘Balancing Valves for Heating andCooling Systems.’

The purpose of this training module isto eamine the types of valves usedto balance hydronic systems! and howto select the correct product for theapplication they are to "e used in.




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Introduction

This module ta#es around $% minutesand forms part of a‘Continuous ProfessionalDevelopment’ training course.

&nce ' modules are complete you can

apply to Danfoss fora certi(cate of your achievement.

)ow let us "egin*.



C O M F O R T C O N T R O L S

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The Danfoss +roup is a globalproducer of components andsolutions for ,efrigeration - irConditioning! Heating - /ater! and0otion Controls.

The History of the

Automatic Balancing Valve




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The History of

Danfoss Balancing Valve

1989 2003

1n 2343 Danfoss produced its (rstseries of 0SV commissioning andSV automatic "alancing valves.

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2009


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1989 2003

1n $%%' Danfoss was the rst ma5orvalve manufacturer to introduce acombined control and automaticbalancing valve, the AB-Q.

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The History of


2009



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1989 2003

The 67)& 0SV8&! uni!ue commissioning valve was launched"y Danfoss in $%%3.

By choosing Danfoss you have over

9: years of e"pertise "ehind you*

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2009

The History of




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What is a Balancing Valve

"alancing valve is a device thatcontrols water #o$ and balances heat and cooling distribution todi;erent locations.

The purpose of the valve is to ena"leus to supply the correct amount ofheat and cooling to each part of the"uilding.

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What is a Balancing Valve

%$o types of "alancing valves areused in heating and cooling systems.

They are manual "alancing valves!such as commissioning sets!and automatic "alancing valves!such as di&erential pressure

control valves.

Danfoss have a full range of manualand automatic "alancing valves! andaim to cover all applications.

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The system "elow has*a boiler!a +-$a( control valve!a controller!and thermostatic radiatorvalves.

+

.

/0

/1

%emperature re!uired 2 3

Why Balance a !ystem

However it has no balancing valves. This results in the rst radiator getting toomuch heat**and the last radiator not having enough heat.




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By putting a "alancing valve oneach of our risers we can ensurethey each get the pressure and #o$ they re<uire. This means heat is correctlydistributed throughout thesystem.

Why Balance a !ystem

By getting the re!uired amount of heat to each area of the "uilding! we ensure our users get there!uired temperature in each of theirradiators.1mproving user comfort and reducing energ(usage is the outcome of good "alancing.




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6et us loo# at theoperation of manual "alancing valves.

These are commonlycalled commissioning ordouble

regulating valves.

Commissioning wor#s "ylimiting the 4v value inthe"alancing valves.

=v is a measure of an

orice.

1t is dened as the >ow incu"ic metres per hour5m+6h?*that can pass through anorice at / Barpressure.

Ho" does a Balancing Valve "or#




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By closing a commissioningvalve we reduce it’s =vvalue and thus the >ow itcan pass.

By setting all theindividual valves in the

system! to deliver there<uired =v! we ensure eacharea of the "uilding gets itscorrect >ow.

By ensuring the correct#o$ to each part of thesystem! we ensure the

correct temperature.

Ho" does a Balancing Valve "or#




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To balance a system we need a methodof measuring and calculating thewater #o$.

/e can therefore prove the correcttemperatures are "eing provided to allareas of the "uilding.

This measuring is carried out "y acommissioning engineer using a #o$measuring device.

Danfoss commissioning valves comewith measuring test points to ena"leorice measurement.

Measuring on $ommissioning Valves




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The t$o types of commissioning valvemeasuring points are "ed orice andvariable orice.

Danfoss 78-9 commissioning valvesutilise a separate :i"ed 8enturiorice for >ow measurement.

This means the =v of the measuringori(ce stays the same as the valvecloses.

Danfoss 78-BD variable orice commissioning valves di;er from (edori(ce valves as the 4v of the ori(ce

drops as the valve is closed;


:i"ed 9rice




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/hen using a variable orice valve!the commissioning engineer re<uires a4v signal chart to calculate >ow fromthe measured pressure.

@sing an 78-9 :i"ed 8enturi orice commissioning valve ma#escommissioning simpler than using avariable orice valve

Aor this reason Danfoss recommend the use of the 78-9 type valve wherepossi"le.

Installation of $ommissioning Valves

:i"ed 9rice




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%raditional commissioning valves needto "e installed in a straight piece ofpipe.

Then you would need to have a length ofstraight pipe e<ual to . times thediameter of the pipe before the valveupstream?.

After the valve downstream? youdneed at least times the diameter ofthe pipe.

This is needed to guarantee theaccurac( of measuring the >ow! whichis otherwise in>uenced "y turbulence.





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1n Danfoss 67)& valves! the >owdirection is not changed li#e in atraditional valve The >ow through the valve iss(mmetrical in all directions.

This means the measurement is notin>uenced "y turbulence of othercomponents in the system** such as elbo$s or pipe-<oints.

67)& 78-BD and 78-9 valves can"e mounted in any spot that isconvenient **and they will still en5oy the

e"ceptionall( high measuringaccurac(.

Installation of $omissioning Valves




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/e use Commissioning valves to "alanceconstant #o$ pumped systems.

constant >ow pumped system is wherethe pump delivers a set-capacit( ofwater at all times.

6et us demonstrate*

Balancing $onstant %lo" &um'ed !ystems




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Here we have a system pictured witha series of chilled panels in theoccupied areas of the "uilding.

These have a commissioning valve tobalance, and a control valve tocontrol the temperature.

s parts of our system reachestemperature! the control valvecloses;

/hen the control valve closes itb(passesthe water a$a( from the chilled

panel.





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By b(passing the panel thecommissioningvalve receives a constant pressure!and constant #o$ from the pump.

This ma#es a commissioning valve!which is a constant 4v valve!suita"le for this application.




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1n a constant #o$ pumped system!the pump uses the same energ(!whether the system is open whenpeople need cooling or closedwhen people don’t. This ma#es the system very energ(in-e*cient.

Because of this in-e*cienc(!constant >ow pumped systems are"ecoming less common.




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8ariable #o$ s(stems are thealternative to constant >owsystems.

The use of varia"le >ow systems iscovered in the Danfoss %rainingodule +-Pressure Control8alves;




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1n a constant #o$ pumpeds(stem! we "alance using theproportional balancing method.

@sing this method we re!uirecommissioning valves

&osition in system

E at all terminal units for local

temperature balance;

E at all branches for circuit temperature

balance;

E at all risers for area temperature

balance;

E at the pump for building temperature

balance;




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&osition in system

The pipe8wor# gets bigger! the closer we

get to thepump.Aor this reason Danfoss o;ercommissioning valves in siFes /.mm, for local balance! up to >33mm for largebuilding balance.

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)ow we have established in what

systemscommissioning valves are installed!and $here in the system they arepositioned! we can then loo# at theselection of valve si?e and how to calculate it’s setting.

/e will do this "y using an e"amplewhere an 0SV8BD variable orice valve is "eing selected.

:i"ed orice valves are calculatedusing thesame method.

$alculating (e)uired !election and !etting




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Aor this eample we will use a >ow

rate of 3;.. l6s! and a valve pressureloss of 3 @Pa or %.$ Bar?.

/e calculate the si?e of valvere<uired "y consulting a #o$selection chart! this can "e found inthe Danfoss product datasheet;

3;.. l6s #o$ is mar#ed on the chartand a line red? drawn directlythrough the 3 @Pa mar@er.

/e follow this "y drawing anotherline green? hori?ontall( through the4v mar@er.

The smallest si?ed valve which canachieve the re!uired >ow! is thenselected. This is a D3 valve mar#ed in"lue?.





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The di&erential pressure loss re<uired in the valve is $% #Ga whiche!uals 3; Bar$%#Ga2%% I%.$"ar?

fter determining the re!uired valvesi?eJthe valve setting is calculated usingthefollowing formula water "asedsystemsK?

1n this case we have >ow rate of 3;..l6s whiche!uals m+6h %.::ls L '.M I $m 'h?


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4v 5m+6h2 m+6hE

3; BarE

4v2

3;>>F2>;>F4v 2

m+6hE

G Di&erential Pressure BarE

4v2:lo$ Hate m+6hE

G Di&erential Pressure BarE

&ur calculation gives us a 4v value of>;>F

This formula re<uires us to s!uare-root this pressure loss 5N%.$ I%.OO9?




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/e then consult the setting chart inthe Danfossdatasheet! and select the setting thatgives this =v value of higher than >;>F.

The setting value of >; is then set inthe valve.


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Danfoss o;er two types of threadedcommissioning valve in the 6eno range.

They are the 78-BD 8ariable orice commissioning valve!and the 78-3 :i"ed 8enturi ori(cecommissioning valve.

Aor #anged re<uirements Danfoss o;er the 78-: valve!and for drain and isolation we have the 78-7 valve.

6et us eplore the range*

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Danfoss eno (ange of $ommissioning Valves




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The 67)& 0SV8& and 0SV8BD ranges are "otht$o-valves in one.

They are a balancing valves**with an in-built /33I shut o& valve.

nd when the handle is pressed do$n to loc@

the setting** the 67)& transforms into a ball valve.

This means that with 5ust a !uarter turn of thehandle you close the valve and its /33Iinternal lea@age free.

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The "all valve is completel( independent of thesetting mechanism so when the valve is opened againyou return it to the e"act same position as "eforeclosing the valve.

Aor convenience there is an indication on the valve that shows if the valve is open or closed.

/hen the valve is closed a red indicator covers thesetting.




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The valves measuring accurac( is plus or minus1I, down to $:Q of the valve maimum =vvalue! ma#ing the valve much better than whatis re<uired "y the Kuropean standard for"alancing valves B7F+.3/LL3;

This 7uropean standard re<uires valves to "e

accurate to plus or minus /1I, at .I of the valves ma"imum 4v value;

/hen using the 0SV8&! loc@ing the setting ise"tremel( eas(. &nce the valve is set we 5ustpush do$n the head and the valve is loc@ed.

This prevents the setting "eing tampered $ith and the s(stem balance "eing a;ected.

The Danfoss 0SV8& features an in8"uilt /33Ishut o& valve.

78-9J :i"ed 9rice




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1n addition to our (ed ori(ce valves! Danfoss alsoo;er a variable orice commissioning valve.

This is the Danfoss 67)& type 78-BD

The 0SV8BD is a user8friendly! versatile "alancing

valvewhich features

8 compact design with remova"le head.

8 loc@able setting.

8n in8"uilt /33I shut-o& ball valve.

8 The 0SV8BD is also accurate to plus or minus 1I, down to $:Q of the valves ma"imum 4v value.


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78-BDJ 8ariable 9rice




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The drain point on the 6eno 0SV8BD ena"lesthe user to drain the circuit "y opening themeasuring point with a 2'mm spanner.

This ena"les the system to "e drained fromthe valve!and removes the cost of installing separatedrain coc@s.

The 6eno 0SV8BD uni<uely features +03Mturning test points! that can "e turned toena"le measuring at an( angle.

This feature ma#e it much easier for thecommissioning engineer to get the #o$measurement device onto the valve whateverthe valve position.Back NextBack Next


78-BDJ 8ariable 9rice




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Aor applications where #anged valves arere<uired! Danfoss o;er the 78-: valve in si?es/.->33mm;

These have the option to come with variableorice measuring points! or to use a separate"ed orice measurement plate.

The 0SV8A$ features

E a digital scale for eas( setting andad<ustment;E a N-shaped design in siFes up to D)2:%! toreduce the overall height of the valve! this isuseful when space is at a premium.

The 0SV8A$ has a high 4v value in all siFescompared to its competitors! this prevents theneed to go to a larger si?e of valve than pipe8wor#! to deliver the re!uired #o$.

Danfoss o;er this valve in P/0 and P. pressure range options.Back NextBack Next





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1n addition to our commissioning valves! Danfosshaveanother valve in the Oeno range;

This is a high !ualit( shut8o; and drain valve!which is Danfoss t(pe 78-7.

The 0SV8S is designed to "e used in con<unction

withthe 0SV8BD and 0SV8& valves.

1n com"ination with a commissioning set! the 0SV8Sensures accurate #o$! measuring! circuit shut-o&,and drain.

The Valve features /33I closing shut-o& function. Practical and simple draining. Kas( mounting.Back NextBack Next

Danfoss eno (ange of !hut-off + Drain Valves




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)ow you are familiar with the 67)& range we haveone

more product to loo# at.

This is a device to ena"le >ow measurement.

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Danfoss eno (ange of !hut-off + drain Valves




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Balancing of water systems re<uire us to "e a"le tomeasure pressure and to calculate #o$.

Danfoss o;er a system to provide simple,accurate and reliable measurement.

This is done using an instrument type P: >333.

The GA0 O%%% uses a main pressure unit which isconnected to the test points on the valves.

The measured pressure is sent via Bluetoothtechnolog( to the HG 1GR hand-held computer;

The setting value in the valve is entered into thesoft$are on the hand8held computer "y the user.

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What do "e use to Measure !ystem %lo"




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By #nowing the valve! its setting**and "y measuring the pressure**we can calculate the #o$ through the valve.

/hen due to variations in the s(stem! the actual>ow is notat the re!uired level to "alance*

*we can use the GA0 O%%% to calculate thecorrect setting inthe valve! to achieve the balance we need.

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What do "e use to Measure !ystem %lo"




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What do "e use to Measure %lo"

The GA0 O%%% comes with

E main pressure unit to measure the pressure.E oses and nipples to connect to various types oftest points.E n HG 1GR handheld computer with built-insoft$are.E charger and GC s(nchronisation cable.E 1n8"uilt valve details and settings for all ma<or

manufacturers valves not 5ust Danfoss?.E The a"ility to calculate the re<uired valve setting toachieve the correct >ow.E K"port capabilities to ena"le pro5ectmeasurements to "e transferred to an K"cel spreadsheet.E The a"ility to print the measured data;E speciall( moulded case.

ll other functions of the handheld computer canalso "e used! such as 0icrosoft &utloo#.

%he P: >333 is a complete pac@age to enable

accurate #o$ measurement and balance;

Gressure @nit

Hand8heldComputer




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ou now have all the information re<uired to specify!

select! and understand the Danfoss range of 0anualBalancing Valves.

Before we (nish! let us review the information youhave learned.

Balancing valves are used to ensure the correct #o$s to areas of a "uildings heating or cooling system.

They wor# "y closing the orice in the valve! whichbalances #o$.

A final revie"




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A final revie"

Constant #o$ pumped s(stems use manualbalancing valves! these are commonly calledcommissioning valves.

8ariable #o$ pumped s(stems re<uireautomatic balancing valves;

Danfoss o;er a complete range of "oth

automatic and manual "alancing valves.




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A final revie"

The Danfoss range has "oth "ed and variable ori(ce commissioning valves.

The 78-BD variable orice valve featuresE +03M rotating test points.E "uilt8in /33I shut-o& isolation valve.E compact design and removable head forcon(ned spaces.

E loc@ing function with simple push8down action




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A final revie"

The Danfoss 78-9 valve features

digital pre-setting scale which is viewa"le fromall angles*and a :i"ed 8enturi orice for simplermeasurement;




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A final revie"

1n addition to commissioning valves Danfoss

also o;er a shut-o& drain valve, type 78-7.




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A final revie"

To commission the system! Danfoss o;er a #o$measuringdevice called the P:>333.

The GA0 O%%% featuresE The capa"ility to measure pressure andcalculate #o$s;E hand-held computer with commissioning

soft$are.E The a"ility to e"port and print pro5ectmeasurements.

By selecting Danfoss you have ever(application covered.



Congratulations for

completing (our secondtraining moduleR

ou now understand all that is re<uired toselect,and specif( Danfoss "alancing valves.

0odule ' has a title of ‘@nderstandingGressure Control Valves’

&nce you have completed three modulesyoucan apply to Danfoss ,andall for your‘Continuous Grofessional Development’

Certi(cate.

Aor more information on Danfoss productsorfor Danfoss8,andall’s contact detailsplease visit ourwe"site at www.danfoss8randall.co.u#

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Danfoss Training Module 2 v3 Balancing Valves Compressed

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