1、BRITISH STANDARDBS EN 14175-6:2006Fume cupboards Part 6: Variable air volume fume cupboardsICS 71.040.10; 91.140.30nullnull nullnullnullnullnullnullnull nullnullnullnullnullnullnull nullnullnull nullnullnullnullnullnullnullnullnullnull nullnullnullnullnullnull nullnull nullnullnullnullnullnullnullnu
2、llnull nullnull nullnullnullnullnullnullnullnullnull nullnullnullIncorporating corrigendum January 2014National forewordThis British Standard is the UK implementation of EN 14175-6:2006. Together with BS EN 14175-1:2003, BS EN 14175-2:2003, BS EN 14175-3:2003, BS EN 14175-4:2004 and DD CEN/TS 14175-
3、5:2006, BS EN 14175-7:2012, it supersedes BS 7258-1:1994, BS 7258-2:1994, BS 7258-3:1994 and BS 7258-4:1994 which are withdrawn.The UK committee advises that prior to purchasing a fume cupboard, a risk assessment should be performed to assess the risks associated with the substances that are to be m
4、anipulated. This would ensure that the fume cupboard is suitable for its intended purpose and that current exposure limits for toxic substances are not exceeded. It is suggested, therefore, that users may need to draw up a specification appropriate to their particular requirements, within the overal
5、l permissible limits of this standard and the information on installation included in the National Annex. For users with little experience of purchasing fume cupboards, it may be helpful for trade associations, employers bodies or other organizations associated with a particular activity to give gui
6、dance on a suitable specification. An example would be Building Bulletin 88 from the Architects A = cross sectional area of the duct8 AirflowrateFigure 2 Typical installationThe static pressure measurement shall be performed according to EN 12589:2001, Annex A.All partswhich are functional component
7、s of the typetested VAV system shall be installed and connected inaccordance with the manufacturers instructions. If the regulation of the VAV system is achieved by controlling fan speed, the damper may be replaced by thevariable flow fan. The test procedure shall be modified in appropriate way.5.3.
8、2.4 Measurements to be takenThe following parameters shall be measured during the tests:a) P S Downstream duct static gauge pressure b) P Flow meter pressure difference (or the appropriate parameter that relates to the air flow rate q v ) EN 14175-6:20069 5.3.2.5 Test procedure With the sash in the
9、required position or fullyopen followthe test procedure given in EN 12589:2001, 5.3.1.2.1to 5.3.1.2.4. The manufacturer shall specifythe maximum and minimum pressure difference to be used in the test. Repeat this testprocedurewith the VAV system under test turned 90 on axis A-A (see Figure 2). 5.3.2
10、.6 Calculation of results Calculation of the test results shall be done in accordance with EN 12589:2001, 5.5.1 and 5.5.2. The minimumlength w shall be stated in the type test report (see 9.1). 5.3.2.7Presentation of results Presentation of the test results shall be done in accordance with EN 12589:
11、2001, 5.6. 5.3.3 Tests for dynamic control behaviour5.3.3.1 Test equipmentIn addition to the test equipment according to 5.3.2.2 a time measurement system with a time constant lessthan t = 0,3 s shall be used.5.3.3.2 Test installationA typical test installation is shown in Figure 2. No additional re
12、sistance, e.g. damper or valve, except the flow rate measurement device shall be installed between the extract air fan downstream of the test installation shown in Figure 2 and the V AV system undertest. No additional automatic duct pressure control system shall be installed. The air flow system sha
13、ll be sized so that the change in static pressure P S is minimized. NOTEAn automatic duct pressure control system can influence the control characteristic of the VAV system undertest. 5.3.3.3 Measurements to be takenThe following parameters shall be measured during the tests:a) P S Downstream duct s
14、tatic gauge pressure b) P Flow meter pressure difference (or the appropriate parameter that relates to the air flow rate q v ) c) t Timed) SPositions of the sash 5.3.3.4 Test of response time 5.3.3.4.1 General The air flow rate of the VAV system being tested should be at the minimum setting when the
15、 sash position hasits minimum opening. At the fully open position of the sash, the air flow rate should be at the maximum setting of the VAV system under test. During the following test procedure the person performing the test shall stand to the side of the testbox while opening and closing the sash
16、. If the VAV system being tested is combined with an air flow rate or velocitymeasurement system, the following tests shall be repeated with the VAV system turned 90 on axis A-A (see Figure 2). EN 14175-6:200610 If the VAV system being tested requires factory calibration for its operation in terms o
17、f air flowdirection (horizontal or vertical), repeat the following tests with air flow straight up and down.5.3.3.4.2 Test at maximum pressure difference Close the sash of the test box to the minimum opening. Adjust the pressure P S (see Figure 2) to the maximum value P S1 in accordance with the man
18、ufacturers instructions. Wait until the value for the volume flow rate iswithin the allowable tolerance. No other parameter, e.g. variable damper positions or fan speed than the VAV system under test shall influence the volume flow rate or the pressure of the air flow system during the test procedur
19、e. Start the recording of the measurements.After about 30 s (t = 0) open the sash to the maximum opening position within (1 0,2) s.After t = 40 s close the sash to the minimum opening within (1 0,2) s.After t = 80 s stop the recording of the measurements.5.3.3.4.3 Test at minimum pressure difference
20、 Open the sash of the test box to its maximum opening. Adjust the pressure P S (see Figure 2) to the minimumvalue P S2 in accordance with the manufacturers instructions. Wait until the value for the volume flow rate iswithin the allowable tolerance. Close the sash to its minimum opening. No other pa
21、rameter, e.g. variable damper positions or fan speed than the VAV system under test shall influence the volume flow rate or the pressure of the air flow system during the test procedure. NOTE If necessary, a bypass with fixed opening(s) can be used to keep the change of the duct pressure low duringt
22、he test procedure.Start the recording of the measurements.After about 30 s (t = 0) open the sash to the maximum opening position within (1 0,2) s.After t = 40 s close the sash to the minimum opening within (1 0,2) s.After t = 80 s stop the recording of the measurements.5.3.3.5 Calculation of results
23、 The response time is the time taken from the start of the sash movement until the air flow rate reaches and maintains,within 10 %, the default air flow rate specified bythe manufacturer.5.3.3.6 Presentation of results The results of each test performed shall be presented graphically as shown in Fig
24、ure 3. The pressure valuesP S1 and P S2 and the response time up and down shallbe stated. EN 14175-6:200611 KeyASash position, set and actual value B Time scale in s C Response time up (example)D Sash fullyopen E Set=minimum FResponse time down (example)G Set=100 % H Actual value of air flow rateI S
25、ash min. OpenJmin. +10 % Kmin. 10 % Figure 3 Example for result presentation5.3.4 Test of set points With the sash of the testbox fullyopen, set the flow rate at a required value. Measure the parameter that the VAV system uses forcontrol (volume flow rate, velocityor pressure difference) with the sa
26、sh at minimum opening, maximum opening and 50 % opening. Compare the measured values with the set values and report the differences. EN 14175-6:200612 5.4Test of VAV fume cupboards 5.4.1 Test installationThe test installation of the air flow system shall be as shown in 5.3.2.3 but with the VAV fume
27、cupboardconnected in place of the test box. The wayin which the VAV system is fitted to the fume cupboard shall be described in the test report. 5.4.2 Test of the integrated VAV system According to 5.3. The test box shall be replaced bythe fume cupboard. 5.4.3Test of the VAV fume cupboard 5.4.3.1 Co
28、ntainmentThe containment testat the outer measurement grid shall be performed in accordance with EN 14175-3:2003, 5.3.4 and 5.3.5.3 as follows:a) at the minimum pressure difference of the VAV system and the fume cupboard with the VAV systemadjusted to the minimum extract volume flow rate and at the
29、test sash opening specified b y the manufacturer of the fume cupboard, and b) at the maximum pressure difference of the VAV system and the fume cupboard with the VAV systemadjusted to the nominal extract volume flow rate specified by the manufacturer ofthe fum e cupboard and at closed sash position.
30、Data analysis and results shall be according to EN 14175-3:2003, 5.3.6.2. 5.4.3.2 Air exchange at minimum volume flow rateThe test shall be performed and evaluated according to EN 14175-3:2003, 5.5 with the minimum air volumeflow rate as specified bythe manufacturer for the minimum sash opening. 6 O
31、n-site test methods 6.1 General In addition to the on-site testmethods specified in EN 14175-4, the following test methods are suited for theon-site testing of VAV fume cupboards. 6.2Extract volume flow rate at set points The extract volume flow rate shall be measured byone of the test methods speci
32、fied in EN 14175-4:2004, 5.5,at the minimum opening and at 50 % of the test sash position (see EN 14175-3:2003, 4.4.2). 6.3Test of set points According to 5.3.4. EN 14175-6:200613 6.4Test of response time Open the sash to the test sash position and allow the flow to stabilise for 180 s. Measure the
33、pressure drop asspecified in EN 14175-4:2004, 5.6, or measure the volume flow rate as specified in EN 14175-4:2004, 5.5.Close the sash and allow the flow to stab ilise for 180 s.Open the sash in (1 0,2) s to the test sash position and record the time for either the pressure drop to returnto the init
34、ial value within 20 % or the volume flow rate to return to the initial value within 10 %.6.5 ContainmentAccording to EN 14175-4:2004, 5.10, or according to 5.4.3.1. Calculate the mean tracer gas (SF6 ) concentration in ppm for the test period from 60 s to 360 s and round the result to the second dec
35、imal place. 6.6Air exchange at minimum volume flowrateAccording to 5.4.3.2. 7 Product manual The product information shall complywith EN 14175-2:2003, Clause 10 with additional descriptions of all VAVcomponents including recommendations for service intervals and routine testing. 8 Marking and labell
36、ing Marking and labelling shall complywith EN 14175-2:2003, Clause 11, including the name of the manufacturerof the fume cupboard and of the VAV system, if different. Where appropriate, requirementsformarking resulting from the machinery directive shall be observed. 9 Test reports9.1Type test report
37、 for VAV systems The type test report for VAV systems shall include the following: a) name (or trade mark) and the address of the manufacturer;b) type designation of the VAV system; c) description of the VAV system including parameters to be specified by the manufacturer and the calibration of the V
38、AV system; d) name and address of the partywhich carries out the tests;e) date of the test, signature and name of the testing person; f) description of the instrumentation, including its specification and calibration, and the testprocedure used; g) description of the test room and the test condition
39、s maintained during the tests, including air temperatureand relative humidity; h) test sash positions employed in the tests;i) extract volume flow rate; EN 14175-6:200614 j) results of the containment tes t; k) result of the air exchange efficiency test; l) diagram of the VAV system according to Fig
40、ure 3; m) reference to this European Standard EN 14175-6:2006 and, if appropriate, any deviation.9.2Type test report for VAV fume cupboards The type test report for a VAV fume cupboard shall include the following: a) name (or trade mark) and the address of the manufacturer;b) type designation of the
41、 fume cupboard; c) description of the fume cupboard including the external and internal dimensions, fitting, services, outlet controls, taps, sinks etc.; d) name and address of the partywhich carries out the tests;e) date of the test, signature and name of the testing person; f) description of the i
42、nstrumentation, including its specification and calibration, and the testprocedure used; g) description of the test room and the test conditions maintained during the tests, including air temperatureand relative humidity; h) test sash positions employed in the tests;i) extract volume flow rate; j) r
43、esults of the containment test; k) result of the air exchange efficiency test; l) manufacturer and type designation of the VAV system, if different from the fume cupboard manufacturer;m) diagram of the VAV system according to Figure 3; n) reference to this European Standard EN 14175-6:2006 and, if a
44、ppropriate, any deviation.9.3On-site test report for VAV fume cupboards The on-site test report for a VAV fume cupboard shall include the following: a) name (or trade mark) and the address of the manufacturer;b) type designation of the fume cupboard; c) description of the fume cupboard including the
45、 external and internal dimensions, fitting, services, outlet controls, taps, sinks etc.; d) name and address of the partywhich carries out the tests;e) date of the test, signature and name of the testing person; f) description of the instrumentation, including its specification and calibration, and
46、the testprocedure used; g) conditions maintained during the tests, including air temperature and relative humidity; h) test sash positions employed in the tests;EN 14175-6:200615 i) results of the performed tests;j) as found data for extract volume flow rate and the finally attained extract volume f
47、low rate afteradjustment of the flow ratewith the date of adjustment; k) manufacturer and type designation of the VAV system, if different from the fume cupboard manufacturer;l) diagram of the VAV system according to Figure 3; m) reference to this European Standard EN 14175-6:2006 and, if appropriat
48、e, any deviation. EN 14175-6:200616 Bibliography1 EN 842, Safety of machinery Visual danger signals General requirements, design and testingEN 14175-6:2006BS EN 14175-6:2006 BSI 2007 17National annex NA (informative)Recommendations for the exchange of information and recommendations for installation
49、NA.1 IntroductionThe requirements contained in the BS EN 14175 series of standards for laboratory fume cupboards supersede the BS 7258 series of standards and these are now withdrawn. However, to ensure completeness of the requirements in the British implementation of these European standards, the safeguards containedin the BS 7258 series (i.e. recommendations for the exchange of information, installation,selection, use and maintenance) are retained. This informative national annex reproduces clauses 2.1 , 2.2 , 2.3, 2.4, 3.2and 3.3 of BS 7258-2:1994, plus cl
