EN 13053:2006

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Ventilation for buildings - Air handling units - Rating and performance for units, components and sectionsVHNFLMVentilation des bâtiments - Caissons de traitement d'air - Classification et performance des unités, composants et sectionsLüftung von Gebäuden - Zentrale raumlufttechnische Geräte - Leistungskenndaten für Geräte, Komponenten und BaueinheitenTa slovenski standard je istoveten z:EN 13053:2006SIST EN 13053:2007en91.140.30VLVWHPLVentilation and air-conditioningICS:SIST EN 13053:2001/AC:2004SIST EN 13053:20011DGRPHãþDSLOVENSKI
STANDARDSIST EN 13053:200701-februar-2007

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 13053August 2006ICS 91.140.30Supersedes EN 13053:2001
English VersionVentilation for buildings - Air handling units - Rating andperformance for units, components and sectionsVentilation des bâtiments - Caissons de traitement d'air -Classification et performance des unités, composants etsectionsLüftung von Gebäuden - Zentrale raumlufttechnischeGeräte - Leistungs-kenndaten für Geräte, Komponentenund BaueinheitenThis European Standard was approved by CEN on 26 June 2006.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2006 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 13053:2006: E

Figure 1 — Position of this standard in the field of mechanical building services

EN 308, Heat exchangers — Test procedures for establishing performance of air to air and flue gases heat recovery devices EN 779, Particulate air filters for general ventilation - Determination of the filtration performance EN 1216, Heat exchangers — Forced circulation air-cooling and air-heating coils — Test procedures for establishing the performance EN 1751, Ventilation for buildings — Air terminal devices — Aerodynamic testing of dampers and valves EN 1886:1998, Ventilation for buildings — Air handling units — Mechanical performance EN 12792:2003, Ventilation for buildings - Symbols, terminology and graphical symbols EN 13779, Ventilation for non-residential buildings - Performance requirements for ventilation and room-conditioning systems EN ISO 3741, Acoustics — Determination of sound power levels of noise sources using sound pressure — Precision methods for reverberation rooms (ISO 3741:1999) EN ISO 3744, Acoustics — Determination of sound power levels of noise sources using sound pressure — Engineering method in an essentially free field over a reflecting plane (ISO 3744:1994) EN ISO 3746, Acoustics — Determination of sound power levels of noise sources using sound pressure — Survey method using an enveloping measurement surface over a reflecting plane (ISO 3746:1995) EN ISO 5136, Acoustics — Determination of sound power radiated into a duct by fans and other air-moving devices — In-duct method (ISO 5136:2003)

functions are combined 3.16 functions
3.16.1 air treatment process by which the state of the air is modified with respect to one or more of its characteristics such as temperature, moisture content, dust content, bacterial count, gas and vapour content 3.16.2 air type designation of air moving through a ventilation, air conditioning or air treatment installation as a function of its location relative to the installation, e.g. outdoor air, exhaust air, extract air etc 3.16.3 cooling removal of
latent and/or sensible heat 3.16.4 dehumidification controlled reduction of water vapour from the air 3.16.5 filtration removal of particulate material from the airstream 3.16.6 heating transfer of heat from one body or medium to another medium 3.16.7 humidification controlled addition of water vapour to an air stream or space 3.16.8 sound reduction controlled reduction of sound energy 3.17 characteristics
3.17.1 air flow movement of air within set boundaries (such as ducts) 3.17.2 air flow rate mass or volume flow of air passing a given plane divided by time

deformation in mm of the external surfaces of the enclosure when subjected to a positive (bulging) or negative (caving) pressure. It is given as the measured difference in distance between a reference plane and the maximum point of deflection when subjected to air pressure 3.17.6 defrosting heat factor ratio between the energy transferred into the air supply and the maximum recoverable energy in exhaust air, excluding the energy input for defrosting 3.17.7 air leakage factor f air tightness expressed as the air leakage per unit envelope area and pressure difference (external air leakage) 3.17.8 air leakage rate qvl air leakage of the air handling unit, subject to air pressure (external air leakage) 3.17.9 external total pressure difference difference between the total pressure at the outlet of the air handling unit and the total pressure at the inlet 3.17.10 humidification efficiency ratio between the mass of water evaporated by the humidifier and the theoretical mass needed to achieve saturation at a given temperature 3.17.11 internal air leakage rate air leakage in between the two air streams within a section 3.17.12 thermal bridging factor kb ratio between the lowest temperature difference between any point on the external surface and the mean internal air temperature and the mean air to air temperature difference 3.17.13 thermal transmittance U heat flow per unit of area and temperature difference 4 Symbols and abbreviations For the purposes of this standard, symbols and units given in EN 12792:2003 and in Table 1 apply together with those defined by the formulae, text and annexes of this standard.

pt Total fan pressure Pa ptu External total pressure difference of the unit Pa Qdefr Total energy input for defrosting during one complete frosting/defrosting cycle J pv
Partial pressure of water vapour Pa qmn Nominal air mass flow rate of the recovery device kg × s-1 qm Air mass flow rate kg × s-1 qv Air volume flow rate m3 × s-1

Table 1 (continued) Symbol Term Unit qvm Measured and converted air volume flow rate m3 × s-1 qvs Specified air volume flow rate m3 × s-1 ta
Dry-bulb temperature °C tm,i
Local temperature at measurement point °C ti Mean internal air temperature °C t Tolerance range % u Uncertainty range of measured data % U Range of uniformity of flow after the mixing section - U
Thermal transmittance of the casing W × (m2 × K)-1 v
Velocity of air at a point m × s-1 x Absolute humidity g x kg-1 ∆τ Sampling interval time s ∆p1 Pressure drop on exhaust-air side Pa εD Defrosting heat ratio - ηh Humidifier efficiency - ηmix Mixing efficiency % ϕ Relative humidity % ρ Density kg × m-3

5 Ratings and performance of the entire air handling unit 5.1 General The performance of the entire air handling unit cannot be defined as the sum of the individual components and sections. Hence, the procedures that follow shall be applied to a complete air handling unit. In particular, and under agreed circumstances these procedures can be applied to a part of an air handling unit. The methods described in 5.2 cover measuring air volume flow together with the external total pressure of the unit and power consumption. By selecting an appropriate test system, these procedures can be extended to include measuring the sound level transmitted from the air handling unit into the ductwork at a known volume flow, as described in 5.3. 5.2 Testing of aerodynamic performance 5.2.1 Characteristics and quantities 5.2.1.1 Characteristics a) External total pressure difference of the unit/Air volume flow - characteristic. The difference in total pressure between outlet and inlet of the air handling unit related to the air volume flow at the measurement plane.

ISO 5801, ISO 5221, EN ISO 5167-1 or ISO 3966, e.g. a nozzle, an orifice plate or a pitot-static tube. b) External total pressure difference of the unit (ptu) shall be calculated from the pressure measurements defined in 5.2.3.2 and is the difference between the total pressure at the outlet of the air handling unit and the total pressure at the inlet. The duct sizes shall be the sizes defined by the manufacturer. NOTE The external total pressure difference ptu is defined in terms of the difference in stagnation pressures between outlet and inlet, but the Mach Number applicable to an air handling unit will be sufficiently low (less than 0,15) for total pressures determined by conventional means. Hence, an external total pressure difference of the unit is: tu1tu2tuppp−= (1) where
ptu is the sum of the static pressure psu and the dynamic pressure pdu, expressed in Pa;
ptu2
is the sum of the static pressure and the dynamic pressure for outlet, expressed in Pa;
ptu1
is the sum of the static pressure and the dynamic pressure for inlet, expressed in Pa. c) Density of air (ρ) shall be given in kg x m-3, by the following expression according to
ISO 5801: ()avat273287p0,378p+−=ρ (2) where
pa is the atmospheric pressure, expressed in Pa;
pv is the partial
pressure of water vapour in the air, expressed in Pa;
287 is the gas constant of dry air, expressed in J x kg-1 x K-1;
ta is the dry-bulb temperature, expressed in °C. d) Temperature of the air (ta,) shall be measured at the point of flow measurement. e) Rotational speed of the fan (nF) shall be measured at each test point. f) Electrical motor input power (PE), the power to the fan motor, shall be measured at each test point. The applied voltage and the current to each phase shall also be recorded when measured.

ISO 5801:1997. 5.2.2.3 Ducted test method The common parts of a ducted system, for Types B, C or D installations, shall conform to the requirements of clause 30 of ISO 5801:1997. The cross-sectional dimensions of the air outlet shall be used to determine the dimensions of the outlet ducting required in a Type B or Type D installation, and the inlet ducting required in a Type C or Type D installation. 5.2.3 Measurement procedure 5.2.3.1 Conditions for measurements Dampers that control the flow of air in the part of the air handling unit to be tested shall be fully open. Other dampers that form part of a different air circuit, e.g. bypass and recirculation dampers, shall be fully closed. All elements included in the design of the air handling unit shall be fitted as intended with filters (average of the measured initial and defined final pressure loss at designed airflow – see 6.9.2) and dry coils. If there is no negative influence on the internal pressure of the unit, the average filter pressure drop shall be simulated by increasing the external total pressure difference of the unit with a value equal to the difference between rated average and initial filter pressure drop. Where the duty specified is for an initial or final filter condition; the artificial external total pressure difference applied shall be the rated design value or shall be increased by the difference between the rated final and initial filter pressure drop (as appropriate). 5.2.3.1.1 Testing of unit with heat recovery Testing shall be performed taking the leakage between the air streams into consideration.

Key 1 Pressure drop on exhaust air side
2 Pressure drop on supply air side 3 EF exhaust air fan 4 SF supply air fan Figure 2 — Testing of complete unit The airflow shall be measured at the supply air side and at the extract air side. The external pressures shall be set to design pressure conditions. Unless otherwise stated, the pressure drop on the outdoor airside and exhaust airside is set to 50 Pa. The remainder of the external pressures shall be set on the supply and extract air openings. In order to avoid leakages from the extract air stream to the supply air stream, the pressure p2 should be higher than the pressure p3. The two pressures p2 and p3 shall be measured. The leakage and the extra pressure drop are the responsibility of the manufacturer. 5.2.3.1.1.2 Testing of one air stream
Key 1 Inlet plate
2 Outlet plate 3 EF exhaust air fan 4 SF supply air fan Figure 3 — Testing of one air stream

additional observations to be made should the test be prolonged. Pressure measurements, at the locations and in the manner described in ISO 5801, shall be recorded at a sufficient number of test points enabling the characteristic curve to be plotted through the specified duty point or over the full operating range, whichever is required. Rotational speed of the fan and the electrical input to the fan motor shall be recorded at each of the test points. 5.2.4 Evaluation of results For each operating point, the external total pressure of the unit and air volume flow shall be calculated in accordance with ISO 5801. It is sufficient, in most circumstances, to adopt the simplified procedures applicable when the Mach Number is less than 0,15 and the fan pressure ratio is less than 1,02 (corresponding to a pressure rise less than 2 000 Pa in ambient air). The external total pressure and the electrical motor input power described in 5.2.1.1 b) shall be converted to values corresponding to a standard air density of 1,20 kg × m-3. 5.3 Testing of acoustic performance 5.3.1 General 5.3.1.1 Acoustic tests 5.3.1.1.1 Duct borne noise tests Measurement of the sound levels transmitted by the unit into the inlet ducting and the outlet ducting shall be conducted in accordance with the test methods specified in one of the following Standards: EN ISO 3741, EN ISO 3744, EN ISO 3746, EN ISO 9614 and EN ISO 5136 5.3.1.1.2 Casing radiated noise test The casing radiated noise emitted by the complete air handling unit shall be determined in accordance with one of the following test methods: EN ISO 3741, EN ISO 3744, EN ISO 3746 and EN ISO 9614 NOTE In the case of air handling units with free inlets or outlets, the casing radiated sound level includes the sound emitted by the free inlet or outlet. 5.3.1.2 Operating point The air handling unit shall work at the operating point defined by the air handling unit manufacturer. 5.3.1.3 Ductwork The ductworks shall be sized to match the manufacturer's recommended outlet or inlet opening and shall maintain a constant cross section. Ductwork lengths shall be at least 3 effective duct diameters, but not less than 2,6 m.

Casing radiated noise tests 5.3.2.1.1 Test set-up The measurement of the sound power level emitted by the air openings and casing of the unit shall be performed using one of the test set-ups shown in Figure 4. Figures 4a) and 4b) show the test set-ups for measurement using a reverberation room. Measurement shall be performed according to EN ISO 3741. Figure 4c) shows the test set-up for measurement using the free field method. Measurement shall be performed according to EN ISO 3744 (accuracy class 2), EN ISO 3746 (accuracy class 3) or EN ISO 9614.

Key 1 Reverberation room 2 Measuring surface Figure 4 — Measurement of airborne noise emitted by the air openings and the casing of the unit 5.3.2.1.2 Noise emitted from the ductwork The ducts shall be of high transmission loss construction to avoid sound radiating from the ducting, contributing to the airborne noise measurements. Confirmation tests shall be conducted to verify that the acoustic contribution from the ductwork is insignificant. For example, successive layers of a low absorption acoustical barrier shall be added to the exterior of the ductwork until the resulting sound measurement indicates no change greater than 1 dB on octave bands from the previous sound measurement in the band of interest. 5.3.2.1.3 Throttling device If a throttling device is necessary for adjusting the unit to the operating point it shall be placed far away from the casing or outside the room in order to avoid its contribution to the resulting sound power level.

Key 1 Reverberation room 2 Baffle 3 Measuring surface Figure 5 — Measurement of noise transmitted by the unit into the ductwork

E
is the duct end correction, expressed in dB;
f is frequency, expressed in Hz;
c is the speed of sound in air, expressed
m × s-1
(344 m/s at 20ºC);
d is the effective diameter of the duct, expressed in m. and Adc4= (5) where
Ac
is the duct cross-sectional area, expressed in m2.

ISO 5801:1997. The tolerance should be applied to a specified duty or duties, not to every point on the air handling unit characteristic. The characteristic is drawn from the measured data and mathematically converted to the standard density 1,2 kg × m-3. The tolerances to define the acceptability of an air handling unit are given in Table 2, in which the values correspond to tolerance grade AN 3 defined in ISO/FDIS 13348. The permissible deviation of the specified duty point from the operating point on the air handling unit characteristic is the sum of the tolerance range of the specified duty point and the uncertainty range of the measured data. This uncertainty range derives from the measuring uncertainty of the methods of measurement and the measuring instruments and test rig used and is to be stated for a confidence level (probability) of 95 %.
For example, the departure for air volume flow is indicated in Figure 6
where
t is the tolerance range of duty point, expressed in %;
u is the uncertainty range of measured data, expressed in %;
qvs is the specified air volume flow, expressed in m3 × s-1;
qvm is the measured and converted air volume flow, expressed in m3 × s-1;
qvm - qvs = ∆qv ≤ t × qvs + u × qvm is the allowable difference in air volume flow, expressed in m3 × s-1.

PE in W *) + 8 % ∆PE = (tP/100 %) × PE Negative deviations are permissible. Total sound power level emitted to the ductwork and by the casing LWA in dB + 4 dB ∆LWA = tLWA The value tLWA in dB is identical to the numerical value for the deviation limit for sound power level of the sound power level stated in dB(A). Negative deviations are permissible. NOTE Uncertainties of the measured data, measuring instruments, and methods are considered in clause 16 of ISO 5801:1997 and ISO 5168. An example taken from clause 16.7 of ISO 5801:1997 is given in Figure 6.
*) A simultaneous tolerance range of 5 % on air volume performance as well as external total pressure difference is acceptable. For electrical motor input power 8 % tolerance range at rated performance is allowed. Consequently, the measured electrical input power at a duty point deviating from the specified value should be converted to a value corresponding to the rated performance. A proportional relationship between input power and air volume flow and/or external total pressure difference may be assumed
5.5 Test report The test report shall include the following information. The following list can be applied for testing any component or section with the relevant items completed and with additional items defined for the component or section. a) Date of the test. b) Name and location of the test laboratory. c) Names of the test engineer and of any witness to the test. d) Type number and description of the air handling unit tested, including details from its rating plate. e) Test standard applied. f) Test method and configuration adopted. g) Description and sketch of the air handling unit and test facility used including the position(s) of damper(s) in the unit. h) Detailed description of the joints between the unit and the ductwork. i) Identification of the instruments used. j) Tabulations of all measured quantities and the calculated values derived from them; the acoustic data shall be supplemented by the following information: Operating point of the unit i
...