Danfoss Training Module 2 v3 Balancing Valves Compressed

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Transcript of Danfoss Training Module 2 v3 Balancing Valves Compressed

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Hello and welcome to Danfoss training module
‘Balancing Valves for Heating and Cooling Systems.’
 The purpose of this training module is to eamine the types of valves used to balance hydronic systems! and how to select the correct product for the application they are to "e used in.
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Introduction
 This module ta#es around $% minutes and forms part of a ‘Continuous Professional Development’  training course.
&nce ' modules are complete you can
apply to Danfoss for a certi(cate of your achievement.
)ow let us "egin*.
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 The Danfoss +roup is a global producer of components and solutions for ,efrigeration - ir Conditioning! Heating - /ater! and 0otion Controls.
The History of the
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The History of
Danfoss Balancing Valve
1989 2003
1n 2343 Danfoss produced its (rst series of 0SV commissioning and SV automatic "alancing valves.
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1989 2003
1n $%%' Danfoss was the rst ma5or valve manufacturer to introduce a combined control and automatic balancing valve, the AB-Q.
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The History of
Danfoss Balancing Valve
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1989 2003
 The 67)& 0SV8&! uni!ue  commissioning valve was launched "y Danfoss in $%%3.
By choosing Danfoss you have over
9: years of e"pertise "ehind you*
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What is a Balancing Valve
"alancing valve is a device that controls water #o$ and balances  heat and cooling distribution to di;erent locations.
 The purpose of the valve is to ena"le us to supply the correct amount of heat and cooling to each part of the "uilding.
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What is a Balancing Valve
%$o types of "alancing valves areused in heating and cooling  systems.
 They are manual "alancing valves! such as commissioning sets! and automatic "alancing valves! such as di&erential pressure 
control valves.
Danfoss have a full range of manual and automatic "alancing valves! and aim to cover all applications.
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+
.
%emperature re!uired 2 3
Why Balance a !ystem
However it has no balancing valves.  This results in the rst radiator getting too much heat* *and the last radiator not having enough heat.
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By putting a "alancing valve on each of our risers we can ensure they each get the pressure and  #o$ they re<uire.  This means heat is correctly distributed throughout the system.
Why Balance a !ystem
By getting the re!uired amount of heat to each  area of the "uilding! we ensure our users get the re!uired temperature in each of their radiators. 1mproving user comfort and reducing energ( usage is the outcome of good "alancing.
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6et us loo# at the operation of manual  "alancing valves.
 These are commonly called commissioning or double
regulating valves.
Commissioning wor#s "y limiting the 4v value in the "alancing valves.
=v is a measure of an
orice.
1t is dened as the >ow in cu"ic metres per hour 5m+6h?* that can pass through an orice at / Bar pressure.
Ho" does a Balancing Valve "or#
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By closing a commissioning valve we reduce it’s =v value and thus the >ow it can pass.
By setting all the individual valves in the
system! to deliver there<uired =v! we ensure each area of the "uilding gets its correct >ow.
By ensuring the correct #o$ to each part of the system! we ensure the
correct temperature.
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 To balance a system we need a method of measuring and calculating the water #o$.
/e can therefore prove the correct temperatures are "eing provided to all areas of the "uilding.
 This measuring is carried out "y a commissioning engineer using a #o$ measuring device.
Danfoss commissioning valves come with measuring test points to ena"le orice measurement.
Measuring on $ommissioning Valves
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 The t$o types of commissioning valve measuring points are "ed orice and variable orice.
Danfoss 78-9 commissioning valves utilise a separate :i"ed 8enturi orice for >ow measurement.
 This means the =v of the measuring ori(ce stays the same as the valve closes.
Danfoss 78-BD variable orice  commissioning valves di;er from (ed ori(ce valves as the 4v of the ori(ce
drops as the valve is closed;
Measuring on $ommissioning Valves
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/hen using a variable orice valve! the commissioning engineer re<uires a 4v signal chart to calculate >ow from the measured pressure.
@sing an 78-9 :i"ed 8enturi orice  commissioning valve ma#es commissioning simpler than using a variable orice valve
Aor this reason Danfoss recommend  the use of the 78-9 type valve where possi"le.
Installation of $ommissioning Valves
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%raditional commissioning valves need to "e installed in a straight piece of pipe.
 Then you would need to have a length of straight pipe e<ual to . times the diameter of the pipe before the valve upstream?.
After the valve downstream? youd need at least times the diameter of the pipe.
 This is needed to guarantee the accurac( of measuring the >ow! which is otherwise in>uenced "y turbulence.
Measuring on $ommissioning Valves
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1n Danfoss 67)& valves! the >ow direction is not changed li#e in a traditional valve  The >ow through the valve is s(mmetrical in all directions.
 This means the measurement is not in>uenced "y turbulence of other components in the system* * such as elbo$s or pipe-<oints.
67)& 78-BD and 78-9 valves can "e mounted in any spot that is convenient * *and they will still en5oy the
e"ceptionall( high measuring accurac(.
Installation of $omissioning Valves
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/e use Commissioning valves to "alance constant #o$ pumped systems.
constant >ow pumped system is where the pump delivers a set-capacit( of water at all times.
6et us demonstrate*
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Here we have a system pictured with a series of chilled panels in the occupied areas of the "uilding.
 These have a commissioning valve to balance, and a control valve to control the temperature.
s parts of our system reaches temperature! the control valve closes;
/hen the control valve closes it b(passes the water a$a( from the chilled
panel.
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Balancing $onstant %lo" &um'ed !ystems 
By b(passing  the panel the commissioning valve receives a constant pressure! and constant #o$ from the pump.
 This ma#es a commissioning valve! which is a constant 4v valve! suita"le for this application.
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Balancing $onstant %lo" &um'ed !ystems 
1n a constant #o$ pumped system! the pump uses the same energ(! whether the system is open when people need cooling or closed when 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 >ow systems.
 The use of varia"le >ow systems is covered in the Danfoss %raining odule +-Pressure Control 8alves;
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1n a constant #o$ pumped s(stem! we "alance using the proportional balancing method.
@sing this method we re!uire commissioning valves
&osition in system
temperature balance;
balance;
balance;
balance;
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 The pipe8wor# gets bigger! the closer we
get to the pump. Aor this reason Danfoss o;er commissioning valves in siFes /.mm, for  local balance! up to >33mm for large building balance.
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)ow we have established in what
systems commissioning valves are installed! and $here in the system they are positioned! we can then loo# at the selection 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 calculated using the same method.
$alculating (e)uired !election and !etting
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Aor this eample we will use a >ow
rate of 3;.. l6s! and a valve pressure loss of 3 @Pa or %.$ Bar?.
/e calculate the si?e of valve re<uired "y consulting a #o$ selection chart! this can "e found in the Danfoss product datasheet;
3;.. l6s #o$ is mar#ed on the chart and a line red? drawn directly through the 3 @Pa mar@er.
/e follow this "y drawing another line green? hori?ontall( through the 4v mar@er.
 The smallest si?ed valve which can achieve the re!uired >ow! is then selected.  This is a D3 valve mar#ed in "lue?.
$alculating (e)uired !election and !etting
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 The di&erential pressure loss re<uired in the valve is $% #Ga which e!uals 3; Bar $%#Ga2%% I%.$"ar?
fter determining the re!uired valve si?eJ the valve setting is calculated using the following formula water "ased systemsK?
1n this case we have >ow rate of 3;.. l6s which e!uals m+6h %.::ls L '.M I $m 'h?
$alculating (e)uired !election and !etting
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3; BarE
m+6hE
&ur calculation gives us a 4v value of >;>F
 This formula re<uires us to s!uare- root this pressure loss 5N%.$ I %.OO9?
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/e then consult the setting chart in the Danfoss datasheet! and select the setting that gives this =v value of higher than >;>F.
 The setting value of >; is then set in the valve.
$alculating (e)uired !election and !etting
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Danfoss o;er two types of threaded commissioning valve in the 6eno range.
 They are the 78-BD 8ariable orice  commissioning valve! and the 78-3 :i"ed 8enturi ori(ce commissioning 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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 The 67)& 0SV8& and 0SV8BD ranges are "oth t$o-valves in one.
 They are a balancing valves* *with an in-built /33I shut o& valve.
nd when the handle is pressed do$n to loc@
the setting* * the 67)& transforms into a ball valve.
 This means that with 5ust a !uarter turn of the handle you close the valve and its /33I internal lea@age free.
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Danfoss eno (ange of $ommissioning Valves
 The "all valve is completel( independent of the setting mechanism so when the valve is opened again you return it to the e"act same position as "efore closing 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 the setting.
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Danfoss eno (ange of $ommissioning Valves
 The valves measuring accurac( is plus or minus 1I, down to $:Q of the valve maimum =v value! ma#ing the valve much better than what is re<uired "y the Kuropean standard  for "alancing valves B7F+.3/LL3;
 This 7uropean standard re<uires valves to "e 
accurate to plus or minus /1I, at .I of the  valves ma"imum 4v value;
/hen using the 0SV8&! loc@ing the setting is e"tremel( eas(. &nce the valve is set we 5ust push do$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 /33I shut o&  valve.
78-9J :i"ed 9rice
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1n addition to our (ed ori(ce valves! Danfoss also o;er a variable orice commissioning valve.
 This is the Danfoss 67)& type 78-BD
 The 0SV8BD is a user8friendly! versatile "alancing
valve which features
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.
Danfoss eno (ange of $ommissioning Valves
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 The drain point on the 6eno 0SV8BD ena"les the user to drain the circuit "y opening the measuring point with a 2'mm spanner.
 This ena"les the system to "e drained from the valve! and removes the cost of installing separate drain coc@s.
 The 6eno 0SV8BD uni<uely features +03M turning test points! that can "e turned to ena"le measuring at an( angle.
 This feature ma#e it much easier for the commissioning engineer to get the #o$ measurement device onto the valve whatever the valve position.Back NextBack Next
Danfoss eno (ange of $ommissioning Valves
78-BDJ 8ariable 9rice
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Aor applications where #anged valves are re<uired! Danfoss o;er the 78-: valve in si?es /.->33mm;
 These have the option to come with variable orice measuring points! or to use a separate "ed orice measurement plate.
 The 0SV8A$ features
E a digital scale for eas( setting and ad<ustment; E a N-shaped design in siFes up to D)2:%! to reduce the overall height of the valve! this is useful when space is at a premium.
 The 0SV8A$ has a high 4v value in all siFes compared to its competitors! this prevents the need to go to a larger si?e of valve than pipe8 wor#! to deliver the re!uired #o$.
Danfoss o;er this valve in P/0 and P.  pressure range options.Back NextBack Next
Danfoss eno (ange of $ommissioning Valves
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1n addition to our commissioning valves! Danfosshave another valve in the Oeno range;
 This is a high !ualit( shut8o; and drain valve! which is Danfoss t(pe 78-7.
 The 0SV8S is designed to "e used in con<unction 
with the 0SV8BD and 0SV8& valves.
1n com"ination with a commissioning set! the 0SV8 S ensures accurate #o$! 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 have one
more product to loo# at.
 This is a device to ena"le >ow measurement.
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Balancing of water systems re<uire us to "e a"le tomeasure pressure and to calculate #o$.
Danfoss o;er a system to provide simple, accurate and reliable measurement.
 This is done using an instrument type P: >333.
 The GA0 O%%% uses a main pressure unit which is connected to the test points on the valves.
 The measured pressure is sent via Bluetooth technolog(  to the HG 1GR hand-held computer;
 The setting value in the valve is entered into thesoft$are on the hand8held computer "y the user.
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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 not at the re!uired level to "alance*
*we can use the GA0 O%%% to calculate thecorrect setting in the valve! to achieve the balance we need.
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 The GA0 O%%% comes with
E  main pressure unit to measure the pressure. E oses and nipples to connect to various types of test points. E n HG 1GR handheld computer with built-in soft$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 to achieve the   correct >ow. E K"port capabilities to ena"le pro5ect measurements 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 can also "e used! such as 0icrosoft &utloo#.
%he P: >333 is a complete pac@age…