15 r_bufé new room pressure technology

AirSystem LabSystem Clean roomLabSystem AirSystem

Cleanroom Technologies

Welcome at

the ACHEMA 2009

Dipl.-Ing Rainer Bufe

AirSystem LabSystem Clean room

2

Founded in: 1958

Employees: 48

Products: Aircontrol

LabControl

Medicine electronic

Consumer electronic

Own research and development

Own production

All products made in Germany

Company details


3Product overview LabSystem - AirSystem

1992 - SMD in line production

1995 - Fume hood monitor

1997 - Fume hood controller(1 st. generation)

1998 - Sash controller

1999 - VAV for supply and exhaust air (AirSystem)

2002 - Clean room controller

2006 - Fume hood controller(5 th. generation)

2008 - Airvolume priorised pressurecontroller VCP (EP-patent)


Typical clean room 4


material lock 5 Pa

changing room5 Pa 35 Pa

overpressure

equipment

clea

n ro

om

clea

n ro

om

clea

n ro

om

grey room

25 Pa

personnel lock 15 Pa

0 Pa

Room pressure and air change rate

Laboratory Clean roomAir change rate 8 times 60 - 600 timesRoom = 150 m3 1.200 m3/h 9.000 – 90.000 m3/h

5


Room pressure with Air Volume Controller

Mechanical CAV

Tolerance ± 15 % (one CAV)

Tolerance ± 22 % (two CAV´s)

Electrically operated CAV/VAV

Tolerance ± 5 % (one CAV/VAV)

Tolerance ± 7,5 % (two CAV´s/VAV´s)35 Pa

overpressure

VAV or CAV

Clean room(+) = overpressure

VAV or CAV

Room height = 3,06 mRoom volume = 150 m3

Supply air 1.500 m3/h Exhaust air 1.300 m3/h

Room leakage200 m3/h

7,00 m

7,00

m

6


7

A µ 3600 ∆p = ▬▬ ▬▬▬▬▬▬▬

Vρ

2

2

General views

Bernoulli - formula

ρ = air density 1,2 kg/m3

µ = constant value 0,72


8

A µ 3600 ∆p = ▬▬ ▬▬▬▬▬▬▬

Vρ

2

2

Detailed view (with tolerances)

VSUPPLY – VEXHAUST = VDIFF

1500 m3/h - 1300 m3/h = 200 m3/h

=> 35 Pa with 0,01 m2 room leakage

With tolerances ± 7,5 %

1500 m3/h ± 7,5 % = ± 112,5 m3/h

VMAXDIFF = 200 + 112,5 = 312,5 m3/h

VMINDIFF = 200 - 112,5 = 87,5 m3/h

∆pMIN=6,8 Pa∆pMAX=87,2 Pa

pressure range 6,8…35…87,2 !!!

=> not acceptable!!!


Room pressure with VAV - Controller

RESULT: Room pressure with CAV/VAV - ControllerEven with very low tolerances not suitable in airtight rooms (small room leakage)

air volume, room volume and room leakagehave strong impact on differential pressure

SOLUTION: Room pressure with pressure controller CRPBetter than CAV/VAV - Controller but even notsatisfying in airtight rooms (very small roomleakage)

be careful with high air volume and very small roomleakage

9


Room pressure with CRP - Controller

Floor(-) = underpressure

Air lock(+) = overpressure

Roo

mex

haus

t air

(con

stan

t)

CAV

Roon

exha

ust a

ir(c

onst

ant)

Roomsupply air(variable)

CRP

- +dP

24V AC


CRP

- +dP

24V AC


CRP

-

+dP

24V AC

CAV

CAV

Roo

mex

haus

t air

(con

stan

t)

Room 1(+) = operpressure

against air lock

Room 2(+++) = overpressure

against floor

instable control

Very important:use common reference - --

---point for measuring the --------underpressure (-)

reference point must be --------nonventilated

use actuators without -------hystersis (instaed of -.-analogue input direct ------------drive actuator)

use actuators with high --- ----resolution (< 0,5 ° => 0,5 %)

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Room pressure with CRP - Controller

35 Pa overpressure

VAV or CAV


CRP

Room height = 3,06 mRoom volume = 150 m3

Supply air1.500 m3/h

Exhaust air 1.300 m3/h

Room leakage200 m3/h

7,00 m

7,00

m

- +dP

Electrically operated CAV/VAV and CRP


Tolerance ± 1,11 % with actuatorresolution 1 ° (usual value)

Tolerance ± 0,5 % with CRP and directdrive actuator from SCHNEIDER (resolution < 0,5 ° and non hysteresis)

11


12

A µ 3600 ∆p = ▬▬ ▬▬▬▬▬▬▬

Vρ

2

2

Room pressure controller CRP

=> 35 Pa with 0,01 m2 room leakage

With tolerances ± 0,5 % (CRP-resolution)

1500 m3/h ± 0,5 % = ± 7,5 m3/h

VMAXDIFF = 200 + 7,5 = 207,5 m3/h

VMINDIFF = 200 - 7,5 = 192,5 m3/h

∆pMIN=33,1 Pa∆pMAX=38,4 Pa

pressure range 33,1…35…38,4

=> acceptable with given room --------leakage ≥ 0,01 m2


Room pressure with VAV - Controller

RESULT: Room pressure with pressure controller CRPAcceptable with high resolution actuator and non hysteresis actuator in airtight rooms(room leakage > 0,01 m2)

not suitable in airtight rooms(room leakage < 0,01 m2)

SOLUTION: Air volume priorised constant room pressurecontroller VCP (European-Patent)

Highest accuracy in the market with electricalcontroller

Very stable control even in airtight rooms withroom leakage < 0,001 m2

equals to 1mm clearance between door frame and door leave!!

13


VCP-L

Floor(-) = underpressure


VAV-L

-+ dP

24V AC

Building management system

R

LON-NETWORK, FTT-10A

room pressure

room air volume

Volume priorised pressure controller VCP

35 Pa overpressure

Electrically operated CAV/VAV and VCP


Tolerance ± 7,5 % (two CAV/VAV)

Tolerance ± 1,11 % with actuatorresolution 1 ° (usual value)

Tolerance ± 0,5 % with VCP and directdrive actuator from SCHNEIDER (resolution < 0,5 ° and non hysteresis)1500 m3/h

1500 m3/h± 7,5 %

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± 0,5 %±112,5 m3/h


15

=> 35 Pa with 0,001 m2 room leakage => Air volume VDIFFERENTIAL = 20 m3/h

With tolerances:

1. Air volume: 1500 m3/h ± 7,5 % = ± 112,5 m3/h

2. Room pressure: ± 112,5 m3/h ± 0,5 % (VCP-resolution) = ± 0,5625 m3/h

35 Pa => VDIFFERENTIAL = 20 m3/h

VMAXDIFF = 20 + 0,5625 = 20,56 m3/h

VMINDIFF = 20 – 0,5625 = 19,44 m3/h

∆pMIN=33,75 Pa ∆pMAX=37,75 Pa

pressure range 33,75…35…37,75

=> very good result with given ------ room leakage 0,001 m2 or ----------even smaller




Very important:use common reference - --

---point for measuring the --------underpressure (-)

reference point must be --------nonventilated

use VCP for airtight rooms--- with small room leakage

use actuators with high --- ----resolution (< 0,5 ° => 0,5 %)

16


17

Advantages of the VCP and room pressure control via bypass:very high resolution of the actuator in the bypass. Controlling of the roompressure via actuator with Direct-Drive-Modus (no hysteresis, resolution < 0,5 °)

avoids oscillating of the system

multitasking system with one common microprocessor unit and internalcommunicating between air volume control device and pressure controldevice

max. allowed range of ± 3 Pa always possible, even over different pressure steps

suitable for controlling of safety laboratory class S1-S4 as well as clean room class A-D

for controlling laboratory class S4 it is mandatory for safety reasonsto use redundant systems



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More advantages of the VCP:sudden loss of room pressure (open of door or window) will berecongised and the damper gets „freezed“ for a certain time (max. 20 s)

no door contacts needed

very precise and stable room pressure control system

room pressure damper (bypass) always between 20…80 % => good control position

complete parametrising via service module SVM100 or PC-softwarePC2500

suitable for safety laboratory with very high airtight doors and rooms(e.g. animal laboratory)

suitable for supply or exhaust air systems

BMS controlling via network. LON, BACnet or Modbus available



Reference project with VCP 19

Reference project: Paul-Ehrlich-Institut, Langen – safety laboratoryclass S3, animal laboratory for BSE-research


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Reference project: Paul-Ehrlich-Institut, Langen – safety laboratory classS3, animal laboratory for BSE-research

Room specification:- Room volume 48,7 m³- Room air change rate 8/12/16 h-1 (Night-Day-Cleaning)- Exhaust air volume 390-585-780 m³/h- Pressure control value - 40 Pa - External differential pressure transmitter with 2------ analogue outputs (controlling and monitoring via LON-network to Honeywell-BMS)

Reference project with VCP


21VCP- drawing with additional manual damper


Remote maintenance and diagnosis via Internet/Intranet

Easy administrating of error- and maintenance reports

Building management systemIntranet Infranet Internet

22


23LabSystem – Reference list

Chemie/Pharmacie■ AVENTIS AG

■ BASF AG

■ BAYER AG

■ BOEHRINGER Ingelheim

■ BYK GULDEN

■ CLARIANT

■ HOFFMANN LA ROCHE AG

■ GOEDECKE / PFIZER

■ GRÜNENTHAL

■ NOVARTIS AG

■ SCHERING AG

Universities■ Freiburg■ Potsdam/Golm

■ Regensburg

■ Tübingen

■ Wuppertal

■ Zürich

Instituts■ MAX-PLANCK-INSTITUT

■ FRAUNHOFER-INSTITUT

■ ADLERSHOF … and more


24Our main customers - Fume cupboard maker


25Our main customers – projects


26

Thank you for your attention

More information www.schneider-elektronik.de

[email protected]

Discussion Questions

Welcome at our Stand

Hall 6.2, Stand C27-C29

15 r_bufé new room pressure technology

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