CAV VAV. Bart Pennewaert

Transcription

1 CAV VAV Christian Malevez Bart Pennewaert Rendez-vous ATIC bijeenkomst

2 Luchthoeveelheidsregeling Constant en Variabel Régulation de débit Constant et Variable Programma Program Meting en regeling Evoluties Toepassingen: Ruimteregeling Drukregeling Speciale oplossingen Atex Labcontrol Selectie Mésurer et régler Evolutions Applications Régulation d une pièce Régulation de pression Solutions spéciales Atex Labcontrol Selection 2

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4 CAV Controller RN / EN function leaf spring under bellow inflating increased tension damper closing duct volume pressure flow increased changed volume volume flow flow under regulated control

5 Mechanical system-powered VFL VFC RN EN

6 VAV Controller Basic function duct pressure increases volume flow control device damper is moved direction of flow flow volume is maintained constant effective pressure increases effective pressure sensor damper actuator damper differential pressure transducer volume flow controller command signal from room temperature controller q V = C * p w 6

7 VAV Controller Measuring methods air velocity effective pressure static effective pressure dynamic

8 VAV Controller Comparison of methods Feature dynamic static range of airflow 10 to 100% app. 17% (20%) to 100% costs 100% app. 250% critical dusty air contaminated air length of tubing gravity dependency drift commissioning parallel measuring not possible parallel measuring possible maintenance none once a year recommended

9 Streaming profile after elbow 8 D 9

10 Dynamic sensor / optimized 10

11 VAV Controller Test rig in our factory in Anholt 11

12 VAV Controller Acoustic designing vav device source duct sound reduction sound source air-regenerated noise grille sound reduction elbow sound reduction reflection air-regenerated noise room absorption sound pressure level in the room

13 VAV Controller Acoustic desining Log 10 Katalog - Tabelle 6 : Air-regenerated noise without attenuator Pst = 100 Pa Pst = 250 Pa Pst = 500 Pa DN V LW in db LW in db LW in db l/s m³/h fm in Hz L in db(a) NC fm in Hz L in db(a) NC fm in Hz L in db(a) NC Linear < < < < < < < <

14 TROX 2011 New Control Components Volume flow controllers LVC-Low Velocity TZ-Silenzio / TA-Silenzio 14

15 Megatrend Green Buildings Energy saving is of most importance To show how innovative a product is, the sustainability is of most interest 15

16 Actual demands Decree for the Energy Law (Basel 2001) Bei der Dimensionierung des Luftkanalnetzes und der Auswahl der. Apparate muss auf geringe Druckverluste geachtet werden. Die maximalen Strömungsgeschwindigkeiten in den Luftaufbereitungsgeräten darf bezogen auf die Nettoquerschnittsfläche des Gehäu - ses 1,5 m/s, bezogen auf die Nettoquerschnittfläche der Apparate 2,0 m/s betragen. In den für den Druckverlust maßgebenden Strängen des Kanalnetzes dürfen fo lgende Geschwindigkeiten nicht überschritten werden: bis m³/h 3 m/s bis m³/h 4 m/s bis m³/h 5 m/s bis m³/h 6 m/s über m³/h 7 m/s Grössere Luftgeschwindigkeiten werden toleriert, wenn: a) weniger als 1000 Betriebsstunden pro Jahr erreicht werden; b) sie wegen einzelner räumlicher Hindernisse nicht vermeidbar sind; c) mit einer fachgerechten Energiebedarfsrechnung nachgewiesen wird, dass kein erhöhter Energieverbrauch auftritt-.für bestehende Klima- und lüftungstechnische Anlagen können. 16

17 Specific Fan Power => SFP Sie definiert in der Klimatechnik das Verhältnis von verbrauchter elektrischer Ventilatorleistung zum geförderten Luftvolumenstrom und wird specific fan power genannt. Die spezifische Ventilatorleistung dient zur Kennzeichnung des elektrischen Energieverbrauchs und kennzeichnet den Leistungsgrad einer Ventilatoranlage, inkl. Riementrieb, Getriebe und Frequenzumrichter. SFP = P q P = used Power [W]. q = V = Transported Volume flow [m³/s] Important: The SFP says nothing about the total energy consumption! (In comparison with DID a cooling with air could have a better SFP!) 17

18 SFP-Classes EN Today: Big HVAC systems SFP-3... SFP-4 and small ones between SFP-5... SFP-7 According to the energy saving decree (ENEV-2007) new HVAC systems with more then 4000m³/h are allowed to work with max. SFP-4 What does that mean for us? Less duct-pressure Less velocities in the ductwork 18

19 The border of todays measuring principles Air velocities in between ca m/s Less dynamic pressure during Vmin control (for dynamic transducers about 2Pa and less then 2 m/s) 19

20 Volume flow measurement p w [ qv= α ε A 2 p w / ρ] q = C* p v w 1,2 kg/m³ ρ = C This method is not possible with LVC-LowVelocity! 20

21 Low velocity in main duct 21

22 High velocity in main duct 22

23 TROX LVC-LowVelocity Controller Very low air velocity in the duct High effective pressures on the plastic nozzle (variable C-value / Deposit of a C-value curve) 23

24 New: TROX LVC-LowVelocity Sizes Optimised for low air velocities from 0,6-6m/s Optimised for low duct pressure from 30Pa - 300Pa Direct connection to main duct possible, no straight lenght required Available in four sizes Compact construction, 310 mm long TROX specific controller 24

25 LVC-LowVelocity / optimized installation options 25

26 LVC-LowVelocity / acoustic data Different pressure area! This little detail caused acoustic problems! 26

27 LVC-LowVelocity / short installation dimensions 27

28 New: LVC-LowVelocity 28

29 TVR-Easy Philosophy also for the LVC EASY EASY EASY Selection according to nominal size of the duct system Flow rate adjustment without adjustment tool Functional testing with service button EASY Functional check by indicator light 29

30 Flow rate tolerance Size

31 New: VAV-Silenzio type TZ- or TA Silenzio with rectangular sides 31

32 TROX Volume Flow Control Devices VAV units with auxiliary power TVR (Easy) LVC-LowVelocity TVJ/TVT (Easy) TVZ/TVA (Easy) TZ(A)-Silenzio TVM 32

33 Toepassingen Applications 33

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38 EASYLAB Basics of pressure control Not so easy to keep him on the same size

39 EASYLAB Basics of pressure control Roomleakage: 0,001 m 2 About 1 mm gap below the door Physical Backround Raumdruck 463 Pa Room pressure = 463 Pa 100 m³/h Vol.-Difference = Volume flow difference A = Roomleakage ρ density of air 1,2 kg/m 3 p According to Bernoulli: = ρ 2 * V A 2 If the area is nearly zero this part of the formular is nearly unlimited! Then little canges in the volume flow have extreme effects

40 EASYLAB Basics of pressure control The volume flow difference is independet of the room size! about 1mm gap p = ρ V * 2 A* µ 2

41 %-control. supply set = exhaust act. % 500m 3 /h Exhaust air 100% means 1,0 +10% means 1,1-10% means m3 /h Supply air

42 Constant difference-control supply set = exhaust act. + Difference 500m 3 /h Exhaust air Difference ± 0 Difference + 50 m 3 /h Difference- 50 m 3 /h m3 /h Supply air

43 EASYLAB Basics of pressure control

44 Possible reference room: Room pressure control -Shaft (all floors and the technical control room are combined) - 15 Pa - constant reference pressure - 15 Pa P - 25 Pa - 10 Pa - 10 Pa

45 Applications spéciales Speciale toepassingen 45

46 ATEX Trox solution TVR-Ex electronic Ex-plugs for all connection wires Ex-Connection box, Ex- actuator and Extransducer under cover blade Material: Sheet metal, Stainless steel, Powder coated Ground wire

47 Principle of the TVR-EX Electronic controller TCU II TVR-EX with all electronic components Power supply 230 / 24 VAC

48 RN-Ex, EN-Ex ATEX Certificate RN-Ex EN-Ex TVR-Ex

49 Everything started with the fume hood The fume hood the start of LABCONTROL A source of possibiliies

50 All necessary components from single source The LABCONTROL system Silencer Diffusers Fire dampers VAV units for all necessary applications for example: -Fume hoods -supply and exhaust side CAV-units Room pressure control and monitoring

51 Minimized wiring EASY to install Easy Wiring: - Connections integrated in the casing - Easy Patch Wire technology 1 LED for failure indication (on both sides) 2 Connection for the 500mm switch (EN 14175) 3 Connection user terminal 1 4 Connection user terminal 2 5 Connection actuator 6 Connection VS-TRD (face velocity sensor) 7 Connection KL (Communication Patch-Wire) 8 Connection KL (Communication Patch-Wire)

52 That is fast!! The wiring can be done within minutes!

53 Selectie en voorbeelden Selection et exemples 53

54 The Easy Philosophy EASY EASY EASY Selection according to nominal size of the duct system Flow rate adjustment without adjustment tool Functional testing with service button EASY Functional check by indicator light 54

55 Size selection, Determination of percentages in % % Volumenstrom flow in % % Luftgeschwindigkeit Air velocity v in m/s D 100 m 3/h l/s 1, ,6 3,9 3,9 m/s5,2 6,5 7,89,1 9,1 m/s 10,4 11, m 3/h l/s m 3/h l/s m 3/h l/s select nominal V max min size 55

56 Determination and adjustment of percentages on site TVR-Easy D 200 LVC-Low Velocity % m 3 /h l/s % 86% Example:. V min Set = 450 m3/h. V max Set = 1250 m3/h 56

57 Connection examples Variable flow rate control Raumtemperatur Room temperature -Regler controller like... If V min is set higher than V max, then V min min is provided as a constant flow rate.. If. V min is set on 0 %, then control is between shut-off and V max. If the control signal falls below 0.1 VDC, the control damper closes (leakage flow only). 57

58 Connection examples Constant volume flow rate control like The. constant flow rate can be set with the V min potentiometer.. The setting of the V max -potentiometer is unimportant. 58

59 Connection examples.. V min / V max changeover Override controls OPEN / CLOSED S2 S1 S3 i.e. Diode 1N S1 open: V min like. S1 closed: V max like S2 closed: Damper blade CLOSED S3 closed: Damper blade OPEN 59

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61 Thanks for your interest! 61