1、NF EN 1886janvier 2008Ce document est usage exclusif et non collectif des clients Saga Web.Toute mise en rseau, reproduction et rediffusion, sous quelque forme que ce soit,mme partielle, sont strictement interdites.This document is intended for the exclusive and non collective use of Saga Web custom
2、ers.All network exploitation, reproduction and re-dissemination,even partial, whatever the form (hardcopy or other media), is strictly prohibited.Saga Web Pour SHANGHAI INTERNAT SCIENCE b) units for residential buildings; c) units producing ventilation air mainly for a manufacturing process. Except
3、for the thermal and acoustic performance of the casing, the test methods and requirements are applicable to both complete units and any separate sections. The filter bypass test is not applicable to the testing of high efficiency particulate air filters (HEPA). NOTE HEPA filters are recommended to b
4、e installed downstream of the air handling unit. Such installations should be leak tested in accordance with the appropriate filter standards. The test method for the thermal performance of the casing is applicable to the comparison of different constructions, but not to the calculation of thermal l
5、osses through casing or the risk of condensation. Similarly, the test method for the acoustic performance of the casing is applicable to the comparison of different constructions, but not to the provision of accurate acoustic data for specific units. 2 Normative references The following referenced d
6、ocuments are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 779, Particulate air filters for general ventilation Determination of th
7、e filtration performance EN 1507, Ventilation for buildings Sheet metal air ducts with rectangular section Requirements for strength and leakage EN 12237, Ventilation for buildings Ductwork Strength and leakage of circular sheet metal ductsEN 12792:2003, Ventilation for buildings Symbols, terminolog
8、y and graphical symbolsEN 13053:2001, Ventilation for buildings - Air handling units Ratings and performance for units, components and sectionsEN 13501-1, 1Fire classification of construction products and building elements Part : Classification using test data from reaction to fire testsEN 61310-1,
9、1Safety of machinery Indication, marking and actuation Part : Requirements for visual, auditory and tactile signals 6131011995(IEC -: )EN ISO 3743 (all parts), Acoustics Determination of sound power levels of noise sources Engineering methods for small, movable sources in reverberant fields EN ISO 3
10、744, Acoustics Determination of sound power levels of noise sources using sound 37441994pressure Engineering method in an essentially free field over a reflecting plane (ISO : ) EN 1886:2007 (E) 8EN ISO 11546-2, Acoustics Determination of sound insulation performances of enclosures 2 1154621995Part
11、: Measurements in situ (for acceptance and verification purposes) (ISO -: ) EN ISO 12100-2, 2Safety of machinery Basic concepts, general principles for design Part : 1210022003Technical principles (ISO -: )3 Terms and definitions For the purposes of this European Standard, the terms and definitions
12、given in EN 12792:2003 and EN 13053:2001 and the following apply. 3.1air handling unit real unitfactory made encased unit serving as a prime mover of a ventilation or air conditioning installation where outdoor air, recirculated air or extract air is treated, consisting of a fan section where a filt
13、er section and heat exchanger may be connected. In addition the unit may consist of an inlet section with one or more louvres and dampers, a mixing section, heat recovery section, one or more heating and cooling coils, humidifiers, sound attenuators and additional equipment such as controls, measuri
14、ng sections etc. 3.2air handling unit model boxspecial test unit (defined in 8.3.2) used to execute measurements for general classification, comparison or categorisation of series or individual casings 4 Usage of real units and/or model boxes for the verification of mechanical performances For clear
15、 and non-ambiguous differentiation, it shall always be indicated whether the measurement has been made on the real unit or on the model box by using the letter “M“ for the model box and “R“ for the real unit in documentation. Test criteria of model boxes and real units are presented in Table 1. EN 1
16、886:2007 (E) 9Table 1 Test criteria of model box and real unit Kind of casing Test criteria Model box (M) Real unit (R) Mechanical strength General classification of casing construction Particular classification of casing construction and individual evaluationAir leakage General classification of ca
17、sing construction Particular classification of casing construction and individual evaluationFilter bypass leakage General classification of casing construction Particular classification of casing construction and individual evaluationThermal transmittance General classification of casing constructio
18、n -Thermal bridging General classification of casing construction -Acoustic insulation General classification of casing construction -5 Mechanical strength of casing 5.1 Requirements and classification Air handling unit casings shall be categorised into classes in accordance to Table 2. Table 2 Casi
19、ng strength classification of air handling units Casing class Maximum relative deflection mm m-1D1D2D3410exceeding 10 NOTE The leakage test shall be done after the strength test. For clear and non-ambiguous differentiation it shall always be indicated whether the measurement was made on the real uni
20、t or on the model box by using letter “M“ for the model box and “R“ for the real unit in documentation. EXAMPLE D1 (M) Class D1 and Class D2 casings shall be designed and selected so that the maximum deflection of any span of the panels and/or frames does not exceed the limits in Table 2 (see Figure
21、 2). EN 1886:2007 (E) 10The casings of class D1, D2 and D3 have to withstand the maximum fan pressure (not shock pressure) at the selected design fan speed. No permanent deformation (hysteresis maximum 2,0 mm per m frame/panel span) of the structural parts (structures and supports) or damage of the
22、casing may occur. Table 3 Test pressures Kind of casing Test criteria Model box (M) Real unit (R) Deflection 1 000 Pa Normal operating conditions at selected design fan speed Withstand maximum fan pressure 2 500 Pa Maximum fan pressure at selected design fan speed Parts of the real unit, which are r
23、unning under positive pressure, shall be tested under positive pressure. Parts of the real unit, which are running under negative pressure, shall be tested under negative pressure. Deviating test pressures shall be specified between the manufacturer and purchaser. EN 1886:2007 (E) 11Key A Panel defl
24、ection B Frame deflection Figure 2 Illustration of panel and frame spans of air handling units The ability of the real unit to withstand the maximum designed fan pressure may be demonstrated by prior agreement between the manufacturer and purchaser, by blanking off the inlets to the unit and running
25、 the fan up to its design operating speed. Downstream sections of blow-through units shall be proved by blanking off the air handling units outlets. Any special requirements, for example the ability to survive shock loading caused by sudden closure of fire dampers, should be clearly specified. EN 18
26、86:2007 (E) 12Figure 3 Deflection of panels and frames of air handling units 5.2 Testing Deflection shall be measured within an accuracy of 0,5 mm whilst the air handling unit is operating under test conditions. For example, referring to Figure 3, deflection XX“ is measured for span RS, deflection X
27、X“ is measured for span PQ. Deflection XX“ is a function of panel stiffness. Deflection XX“ is a function of both frame and panel stiffness. Frame deflection is RR and SS. EXAMPLE PQ = 2m RS = RS = 1 m Measured deflection XX“ = 8 mm Measured deflection XX“ = 5 mm EN 1886:2007 (E) 13Hence, the deflec
28、tion of span RS is 5 mm m-1 and that of span PQ is 4 mm m-1. The class is determined by the highest value of the measured relative deflections. In this example the deflection of RS (the shortest span) determines that class D2 is met. 6 Casing air leakage 6.1 Requirements and classification The leaka
29、ge test shall be done after the strength test. 6.1.1 Units operating under negative pressure only The air leakage of the assembled air handling unit shall be tested at 400 Pa negative pressure and it shall not exceed the applicable rate given in Table 4. Table 4 Casing air leakage classes of air han
30、dling units, 400 Pa negative test pressure Leakage class of casing Maximum leakage rate (f400)l s-1 m-2Filter class (EN 779) L1L2L30,150,441,32superior to F9F8 to F9 G1 to F7 NOTE The maximal leakage rates given in Table 4 are according to the ductwork leakage classes specified in EN 1507 and EN 122
31、37, (e.g. L2 = B), but the test pressures are different. NOTE Class L1 for units for special application e.g cleanrooms. In the case of units tested at a pressure deviating from 400 Pa the measured leakage rate shall be converted into a value at reference pressure, using the following formula: 0,65m
32、400 pressuretest400ff (1) where:fm is the measured leakage rate at the actual test pressure; f400 is the converted leakage rate at 400 Pa , see Table 4. Unless otherwise specified, the applicable rate shall be a function of the efficiency of the air filters within the air handling unit. Where there
33、is more than one stage of air filtration, the classification shall be based on the efficiency of the highest grade of filter. NOTE For special applications by agreement, leakage class may be chosen independent from the filter class. Even if the unit is not equipped with filters, class L3 is still re
34、commended. EN 1886:2007 (E) 146.1.2 Units operating under both negative and positive pressure Air handling units with sections operating under positive pressure shall, in all cases, have the positive pressure sections tested separately from the rest of the unit where the operating pressure immediate
35、ly downstream of the fan exceeds 250 Pa positive pressure. If the positive pressure does not exceed 250 Pa, a negative pressure test shall be sufficient. The test pressure applied to the positive pressure sections shall be 700 Pa positive pressure or the air handling units maximum positive operating
36、 pressure, whichever is the greater. The remainder of the unit shall be tested in accordance with 6.1.1, with the applicable leakage rate being governed by the efficiency of the filter immediately upstream of the fan. It is also allowed to test the entire unit under positive and negative pressure. T
37、he air leakage from the sections subjected to 700 Pa positive pressure shall be in accordance with Table 5. Table 5 Casing air leakage classes of air handling units, 700 Pa positive test pressure Leakage class of casing Maximum leakage rate (f700)l s-1 m-2L1L2L30,220,631,90NOTE Class L1 for units fo
38、r special application e.g cleanrooms. In the case of units tested at a pressure deviating from 700 Pa the measured leakage rate shall be converted into a value at reference pressure, using the following formula: 0,65m700 pressuretest700ff (2) where fm is the measured leakage rate at the actual test
39、pressure; f700 is the converted leakage rate at 700 Pa , see Table 5.Air leakage tests on model boxes shall be performed at both 400 Pa negative pressure and 700 Pa positive pressure.6.2 Testing 6.2.1 Test apparatus The test apparatus shall be as shown in Figure 4, using a fan with a duty at least c
40、apable of meeting the anticipated leakage rate at the respective test pressure(s). If the air handling unit is too large for the capacity of the leakage test apparatus (accuracy 3,0 %), or a restriction of access for delivery requires that the unit should be tested in sections or sub-assemblies, the
41、 breakdown should be agreed by the manufacturer and purchaser prior to the test date. EN 1886:2007 (E) 15Where heat recovery devices are installed, the supply and extract sections shall be tested together as a single unit. Key 1 AHU under test 5 Flow measurement device 2 AHU test pressure gauge 6 In
42、let plate 3 Bleed valve as alternative to variable speed fan 7 Outlet plate 4 Variable speed fan Figure 4 Apparatus for testing the casing air leakage (negative pressure test). Typical example 6.2.2 Preparation for test The unit to be tested shall be put up in the plane in which it is intended to op
43、erate with its sections connected or joined by the method given in the installation instructions. EN 1886:2007 (E) 16Where it is necessary to fit blanking plates, the plates shall be fitted by a similar method to that of the intended installed joint. Openings for electrical, air or water services sh
44、all be closed prior to testing. Dampers shall be dismounted before testing or fitted with blanking plates if the damper is inside. The air handling unit shall not incorporate any additional sealing over that of the standard product or, where applicable, of the agreed specification. 6.3 Test procedur
45、e Turn on the test apparatus fan unit and adjust until the static test pressure inside the test unit is within 5 % of the specified figure. Keep this pressure constant for 5 minutes, and do not record any readings until the pressure has stabilised. Record the leakage flow rate and the test pressure.
46、 6.4 Determination of allowable leakage rates Calculate the casing surface area from the nominal external dimensions, including the area of the blanked inlet and outlet airflow aperture. The area of components which does not form part of the airtight casing shall be excluded, as well as the area of blanking plates on openings of separately tested unit sections.Leakage results obtained from test pressures deviating from the specified standard test pressure (maximum deviation 5 %), shall be converted into leakage rates in a
