SIST EN 13141-8:2014
(Main)Ventilation for buildings - Performance testing of components/products for residential ventilation - Part 8: Performance testing of un-ducted mechanical supply and exhaust ventilation units (including heat recovery) for mechanical ventilation systems intended for a single room
Ventilation for buildings - Performance testing of components/products for residential ventilation - Part 8: Performance testing of un-ducted mechanical supply and exhaust ventilation units (including heat recovery) for mechanical ventilation systems intended for a single room
EN 13141-8 specifies the laboratory test methods and test requirements for the testing of aerodynamic, thermal and acoustic performance, and the electrical power of an un-ducted mechanical supply and exhaust ventilation unit used in a single room. The purpose of this European Standard is not to consider the quality of ventilation but to test the performance of the equipment. In general, a ventilation unit contains: - supply and exhaust air fans; - air filters; - air to air heat exchanger or air storage mass for exhaust air heat and humidity recovery; - control system; - inlet and outlet grilles. Such equipment can be provided in more than one assembly, the separate assemblies of which are designed to be used together. Such equipment can contain alternating heat exchangers which provide separate supply and exhaust air flows. In certain cases, i.e. alternating ventilation unit, the manufacturer may recommend that the equipment can be installed in such a way that it serves more than one room. For the purpose of this European Standard, these products are assessed in a single room. This European Standard does not deal with ducted units or units with heat pumps. Safety requirements are given in EN 60335-2-80:2003
Lüftung von Gebäuden - Leistungsprüfung von Bauteilen/Produkten für die Lüftung von Wohnungen - Teil 8: Leistungsprüfung von mechanischen Zuluft- und Ablufteinheiten ohne Luftführung (einschließlich Wärmerückgewinnung) für ventilatorgestützte Lüftungsanlagen von einzelnen Räumen
Diese Europäische Norm legt die Laborverfahren für und die Anforderungen an die Prüfung des aero¬dyna-mischen, wärmetechnischen und akustischen Verhaltens sowie die elektrische Leistung einer mechanischen Zuluft- und Ablufteinheit ohne Luftführung in einem einzelnen Raum fest.
Im Allgemeinen besteht eine derartige Einheit aus:
- Zuluft- und Fortluftventilatoren;
- Luftfiltern;
- Luft/Luft-Wärmeübertrager oder Luftspeichermasse für die Wärmerückgewinnung aus der Fortluft;
- Regel- und Steuereinrichtung;
- Einlass- und Austrittsluftgitter.
Derartige Ausrüstung kann in mehr als einer Baugruppe geliefert werden, wobei die einzelnen Bau¬gruppen für die gemeinsame Verwendung ausgelegt sind.
Derartige Ausrüstung kann Umschalt-Wärmeübertrager mit getrennten Zuluft- und Fortluftströmen ent¬halten.
Einheiten mit Luftführung oder mit Wärmepumpen sind in dieser Europäischen Norm nicht behandelt.
Die Sicherheitsanforderungen sind in EN 60335-2-80 angegeben.
Ventilation des bâtiments - Essais de performance des composants/produits pour la ventilation des logements - Partie 8: Essais de performance des unités de soufflage et d'extraction (y compris la récupération de chaleur) pour les systèmes de ventilation mécaniques non raccordés prévus pour une pièce
La présente Norme européenne spécifie les méthodes d’essai de laboratoire et les exigences correspondantes pour la détermination des performances aérauliques, thermiques et acoustiques ainsi que de la puissance électrique d’une unité de soufflage et d’extraction pour système de ventilation mécanique non raccordé prévu pour une pièce.
D’une manière générale, ce type d’unité comprend :
- des ventilateurs de soufflage et d’extraction d'air ;
- des filtres à air ;
- un échangeur thermique air/air ou un stockage d'air pour la récupération de chaleur de l’air extrait ;
- un système de commande ;
- des grilles d'entrée et de sortie.
Cet équipement peut se composer de plusieurs assemblages conçus pour être utilisés ensemble.
Cet équipement peut contenir des échangeurs de chaleur alternatifs fournissant des flux d'air de soufflage et d'extraction séparés.
La présente Norme européenne ne traite pas des bouches raccordées ou équipées de pompes à chaleur.
Les exigences de sécurité sont données dans l’EN 60335-2-80.
Prezračevanje stavb - Preskušanje lastnosti stanovanjskih prezračevalnih komponent/izdelkov - 8. del: Preskušanje lastnosti mehanskih brezkanalnih dovodnih in odvodnih prezračevalnih enot (vključno z rekuperacijo toplote) za mehanske prezračevalne sisteme za mehansko prezračevanje posameznih prostorov
Standard EN 13141-8 določa laboratorijske preskusne metode ter preskusne zahteve za preskušanje aerodinamičnih, toplotnih in akustičnih lastnosti ter električno napajanje brezkanalne dovodne in odvodne prezračevalne enote za posamezne prostore. Ta evropski standard ni namenjen obravnavanju kakovosti prezračevanja, ampak preskušanju lastnosti opreme. Prezračevalna enota na splošno zajema: – dovodne in odvodne zračne ventilatorje; – zračne filtre; – zračni toplotni prenosnik ali maso za skladiščenje zraka za rekuperacijo toplote in vlage iz odvodnega zraka; – nadzorni sistem; – dovodne in odvodne rešetke. Taka oprema se lahko zagotovi v več sestavih, pri čemer so ločeni sestavi oblikovani tako, da se uporabljajo skupaj. Taka oprema lahko zajema izmenične toplotne izmenjevalnike, ki zagotavljajo ločena pretoka dovodnega in odvodnega zraka. V nekaterih primerih, tj. pri izmenični prezračevalni enoti, lahko proizvajalec priporoča, da se oprema namesti tako, da prezračuje več prostorov. Za namen tega evropskega standarda se ti izdelki ocenijo v enem samem prostoru. Ta evropski standard ne obravnava kanalnih enot ali enot s toplotnimi črpalkami. Varnostne zahteve so navedene v standardu EN 60335-2-80:2003
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.HYDOQLKNDQDOQLKLKSURVWRURYLüftung von Gebäuden - Leistungsprüfung von Bauteilen/Produkten für die Lüftung von Wohnungen - Teil 8: Leistungsprüfung von mechanischen Zuluft- und Ablufteinheiten ohne Luftführung (einschließlich Wärmerückgewinnung) für ventilatorgestützte Lüftungsanlagen von einzelnen RäumenVentilation des bâtiments - Essais de performance des composants/produits pour la ventilation des logements - Partie 8: Essais de performance des unités de soufflage et d'extraction (y compris la récupération de chaleur) pour les systèmes de ventilation mécaniques non raccordés prévus pour une pièceVentilation for buildings - Performance testing of components/products for residential ventilation - Part 8: Performance testing of un-ducted mechanical supply and exhaust ventilation units (including heat recovery) for mechanical ventilation systems intended for a single room91.140.30VLVWHPLVentilation and air-conditioningICS:Ta slovenski standard je istoveten z:EN 13141-8:2014SIST EN 13141-8:2014en,fr,de01-september-2014SIST EN 13141-8:2014SLOVENSKI
STANDARDSIST EN 13141-8:20061DGRPHãþD
SIST EN 13141-8:2014
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 13141-8
June 2014 ICS 91.140.30 Supersedes EN 13141-8:2006English Version
Ventilation for buildings - Performance testing of components/products for residential ventilation - Part 8: Performance testing of un-ducted mechanical supply and exhaust ventilation units (including heat recovery) for mechanical ventilation systems intended for a single room
Ventilation des bâtiments - Essais de performance des composants/produits pour la ventilation des logements - Partie 8 : Essais de performance des unités de soufflage et d'extraction (y compris la récupération de chaleur) pour les systèmes de ventilation mécaniques non raccordés prévus pour une pièce
Lüftung von Gebäuden - Leistungsprüfung von Bauteilen/Produkten für die Lüftung von Wohnungen - Teil 8: Leistungsprüfung von mechanischen Zuluft- und Ablufteinheiten ohne Luftführung (einschließlich Wärmerückgewinnung) für ventilatorgestützte Lüftungsanlagen von einzelnen Räumen This European Standard was approved by CEN on 6 February 2014.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2014 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 13141-8:2014 ESIST EN 13141-8:2014
EN 13141-8:2014 (E) 2 Contents Page Foreword . 4 Introduction . 5 1 Scope . 7 2 Normative references . 7 3 Terms, definitions and classification . 8 3.1 Terms and definitions . 8 3.2 Classification . 10 4 Symbols and abbreviations . 10 5 Test methods . 12 5.1 General . 12 5.2 Performance testing of aerodynamic characteristics . 12 5.2.1 General . 12 5.2.2 Internal leakages and mixing . 12 5.2.3 Air flow . 16 5.2.4 In/out airtightness . 17 5.2.5 Filter bypass . 17 5.3 Specific performance testing of aerodynamic characteristics for alternating ventilation unit including a storage type heat exchangers . 17 5.3.1 Reference air flow . 17 5.3.2 Leakages . 19 5.3.3 In/out airtightness . 20 5.4 Performance testing of thermal characteristics . 20 5.4.1 Temperature and humidity ratios on supply air side (mandatory measurement) . 20 5.4.2 Temperature and humidity ratios on exhaust air side (optional measurement) . 20 5.4.3 Test requirements . 20 5.4.4 Test operating conditions . 21 5.4.5 Temperature conditions . 21 5.4.6 Test procedure . 22 5.4.7 Test model for testing alternating ventilation units . 23 5.5 Effective power input . 25 6 Classification . 25 6.1 Leakage classification . 25 6.2 Airflow sensitivity classification . 25 6.3 Indoor/outdoor airtightness of the complete unit . 26 7 Requirements . 26 8 Calculations . 27 8.1 General calculations . 27 8.2 Special calculations for alternating heat exchangers . 28 9 Performance testing of acoustic characteristics . 29 9.1 General . 29 9.2 Radiative sound power in the indoor or outdoor space . 29 9.2.1 General . 29 9.2.2 Reverberant room method . 29 9.2.3 Anechoic or semi-anechoic room method . 30 9.2.4 Free field method . 30 9.3 Airborne sound insulation . 31 10 Test results . 31 10.1 Test report . 31 SIST EN 13141-8:2014
EN 13141-8:2014 (E) 3 10.2 Product specifications . 32 10.3 Additional information related to the performance of the product . 32 10.4 Leakages . 32 10.5 Air flow . 33 10.6 Effective power input . 33 10.7 Temperature and humidity ratios . 33 10.8 Acoustic characteristics . 34 11 Cleaning and maintenance . 35 Annex A (informative)
Test layouts . 36 Annex B (normative)
Pressure leakage test method . 38 B.1 External leakage test . 38 B.2 Internal leakage test . 38 Annex C (normative)
Indoor mixing . 40 C.1 General. 40 C.2 Determination of indoor mixing - First test . 40 C.3 Determination of indoor mixing - Second test . 40 C.4 Indoor mixing calculation . 40 Bibliography . 41
SIST EN 13141-8:2014
EN 13141-8:2014 (E) 4 Foreword This document (EN 13141-8:2014) has been prepared by Technical Committee CEN/TC 156 “Ventilation for buildings”, the secretariat of which is held by BSI. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by September 2014, and conflicting national standards shall be withdrawn at the latest by September 2014. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 13141-8:2006. In comparison to EN 13141-8:2006 the following changes have been made: — alternating ventilation units including a storage type heat exchangers have been included; — measurement of the deviation of air flow rate due to façade pressures in normal use has been introduced; — temperature conditions have been modified to be the same as in EN 13141-7 that is to say 7 °C / 20 °C. EN 13141 consists of the following parts, under the general title Ventilation for buildings componentsiproducts for residential ventilation: — mart 1: Externally and internally mounted air transfer devices; — mart l: bxhaust and supply air terminal devices; — mart m: oange hoods for residential use; — mart 4: cans used in residential ventilation systems; — mart o: Cowls and roof outlet terminal devices; — mart 6: Exhaust ventilation system packages used in a single dwelling; — mart 7: merformance testing of a mechanical supply and exhaust ventilation units bincluding heat recoveryc for mechanical ventilation systems intended for single family dwellings; — mart 8: merformance testing of un-ducted mechanical supply and exhaust ventilation units bincluding heat recoveryc for mechanical ventilation systems intended for a single room; — mart 9: bxternally mounted humidity controlled air transfer device; — mart 1M: eumidity controlled extract air terminal device. — mart 11: mositive pressure ventilation systems. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. SIST EN 13141-8:2014
EN 13141-8:2014 (E) 5 Introduction This European Standard specifies methods for the performance testing of components used in residential ventilation systems to establish the performance characteristics as identified in EN 13142 [1]. This European Standard incorporates many references to other European and International Standards, especially on characteristics other than the aerodynamic characteristics, for instance on acoustic characteristics. In most cases some additional tests or some additional conditions are given for the specific use in residential ventilation systems. This European Standard can be used for the following applications: — laboratory testing; — attestation purposes. The position of this European Standard in the field of standards for the mechanical building services is shown in Figure 1. SIST EN 13141-8:2014
EN 13141-8:2014 (E) 6
Figure 1 — Position of EN 13141-8 in the field of the mechanical building services SIST EN 13141-8:2014
EN 13141-8:2014 (E) 7 1 Scope This European Standard specifies the laboratory test methods and test requirements for the testing of aerodynamic, thermal and acoustic performance, and the electrical power of an un-ducted mechanical supply and exhaust ventilation unit used in a single room. The purpose of this European Standard is not to consider the quality of ventilation but to test the performance of the equipment. In general, a ventilation unit contains: — supply and exhaust air fans; — air filters; — air to air heat exchanger or air storage mass for exhaust air heat and humidity recovery; — control system; — inlet and outlet grilles. Such equipment can be provided in more than one assembly, the separate assemblies of which are designed to be used together. Such equipment can contain alternating heat exchangers which provide separate supply and exhaust air flows. In certain cases, i.e. alternating ventilation unit, the manufacturer may recommend that the equipment can be installed in such a way that it serves more than one room. For the purpose of this European Standard, these products are assessed in a single room. This European Standard does not deal with ducted units or units with heat pumps. Safety requirements are given in EN 60335-2-80:2003 [2]. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 306, eeat exchangers - Methods of measuring the parameters necessary for establishing the performance EN 779, marticulate air filters for general ventilation - aetermination of the filtration performance EN 12792:2003, Ventilation for buildings - pymbolsf terminology and graphical symbols EN 13141-4, Ventilation for buildings - merformance testing of componentsiproducts for residential ventilation - mart 4: cans used in residential ventilation systems EN ISO 717-1, Acoustics - Rating of sound insulation in buildings and of building elements - mart 1: Airborne sound insulation bfpl 717-1c EN ISO 3741, Acoustics - aetermination of sound power levels and sound energy levels of noise sources using sound pressure - mrecision methods for reverberation test rooms bfpl m741c EN ISO 3743-1, Acoustics - aetermination of sound power levels and sound energy levels of noise sources using sound pressure - bngineering methods for small movable sources in reverberant fields - mart 1: Comparison method for a hard-walled test room bfpl m74m-1c SIST EN 13141-8:2014
EN 13141-8:2014 (E) 8 EN ISO 3743-2, Acoustics - aetermination of sound power levels of noise sources using sound pressure - bngineering methods for smallf movable sources in reverberant fields - mart l: Methods for special reverberation test rooms bfpl m74m-lc EN ISO 3744, Acoustics - aetermination of sound power levels and sound energy levels of noise sources using sound pressure - bngineering methods for an essentially free field over a reflecting plane bfpl m744c EN ISO 3745, Acoustics - aetermination of sound power levels and sound energy levels of noise sources using sound pressure - mrecision methods for anechoic rooms and hemi-anechoic rooms bfpl m74oc EN ISO 9614-1, Acoustics - aetermination of sound power levels of noise sources using sound intensity - mart 1: Measurement at discrete points bfpl 9p14-1c EN ISO 9614-2, Acoustics - aetermination of sound power levels of noise sources using sound intensity - mart l: Measurement by scanning bfpl 9p14-lc EN ISO 10140-1:2010, Acoustics - iaboratory measurement of sound insulation of building elements - mart 1: Application rules for specific products bfpl 1M14M-1:lM1Mc EN ISO 10140-2, Acoustics - iaboratory measurement of sound insulation of building elements - mart l: Measurement of airborne sound insulation bfpl 1M14M-lc EN ISO 10140-5, Acoustics - iaboratory measurement of sound insulation of building elements - mart o: oequirements for test facilities and equipment bfpl 1M14M-oc 3 Terms, definitions and classification For the purpose of this document, the terms and definitions given in EN 12792:2003 and the following apply. 3.1 Terms and definitions 3.1.1 external leakage leakage to or from the air flowing inside the casing of the unit to or from the air external to the equipment under test 3.1.2 internal leakage leakage inside the unit between the exhaust and the supply air flows 3.1.3 filter bypass leakage air bypass around filter cells 3.1.4 indoor/outdoor airtightness maximum of air flow at – 20 Pa and + 20 Pa corresponding to the setting when the fans are off 3.1.5 outdoor mixing mixing of the two airflows external to the equipment under test between discharge and intake ports at outdoor terminal points caused by short circuiting 3.1.6 indoor mixing mixing of the two airflows under test between discharge and intake ports at indoor terminal points caused by short circuiting SIST EN 13141-8:2014
EN 13141-8:2014 (E) 9 3.1.7 maximum air volume flow air flow corresponding to that at the maximum setting and at no pressure difference, 0 Pa, between indoor and outdoor Note 1 to entry: If the supply and exhaust air volume flows are different, then the maximum air volume flow is equal to the smaller of the two air volume flows. 3.1.8 minimum air volume flow air flow corresponding to that at the minimum setting and at no pressure difference, 0 Pa, between indoor and outdoor Note 1 to entry: If the supply and exhaust air volume flows are different, then the minimum air volume flow is equal to the smaller of the two air volume flows. 3.1.9 reference air volume flow airflow at 70 % of the maximum air volume flow Note 1 to entry: If the supply and exhaust air volume flows are different, then the reference air volume flow is equal to the smaller of the two air volume flows. Note 2 to entry: If the air volume flow cannot be adjusted on the product itself, the closest value above 70 % is selected. 3.1.10 air flow sensitivity sensitivity to variations in the balance between supply airflow and exhaust airflow due to pressure difference variations over the façade Note 1 to entry: Unbalanced (unequal) supply and exhaust air streams influence the thermal efficiency of the ventilation unit and its air exchange capacity. 3.1.11 air exchange capacity ability of the ventilation unit to exchange the used indoor air by fresh outdoor air in a room, under the varying occurring circumstances 3.1.12 temperature ratio temperature difference between inlet and outlet of one of the airflows divided by the temperature difference between the inlets of both airflows 3.1.13 humidity ratio difference of water content between inlet and outlet of one of the air flows divided by the difference of water content between the inlets of both air flows 3.1.14 effective power input average electrical power input to the equipment within a defined interval of time obtained from: — power input of the fans; — power input for operation of any power input including the control, the transformer and for defrosting, excluding additional electrical heating devices not used for defrosting; — power input of all controls, transformers, power supplies and safety devices of the equipment Note 1 to entry: Effective power input is expressed in watts. SIST EN 13141-8:2014
EN 13141-8:2014 (E) 10 3.1.15 test voltage voltage used for supplying the components during the testing 3.2 Classification The classification of heat exchangers is the following: — Category I: Recuperative heat exchangers (e.g. air-to-air plate or tube heat exchanger) Recuperative heat exchangers are designed to transfer thermal energy (sensible or total) from one air stream to another without moving parts. Heat transfer surfaces are in form of plates or tubes. This heat exchanger may have parallel flow, cross flow or counter flow construction or a combination of these. Plate and tube heat exchangers with vapour diffusion (for instance cellulose) are also in this category. — Category II: Regenerative heat exchangers (e.g. rotary or alternating heat exchanger) A rotary heat exchanger is a device incorporating a rotating “thermal wheel” for the purpose of transferring energy (sensible or total) from one air stream to the other. It incorporates material allowing latent heat transfer, a drive mechanism, a casing or frame, and includes any seals which are provided to retard bypassing and leakage or air from one air stream to the other. Regenerative heat exchangers have varying degrees of moisture recovery, depending on the material used (e.g. “condensation rotor/non hygroscopic rotor”, “hygroscopic rotor” and “sorption rotor” heat exchangers). 4 Symbols and abbreviations For the purpose of this document, the symbols and abbreviations given in EN 12792:2003 and the following apply. The symbols used in this document are listed in Table 1. Table 1 — Symbols Symbol Designation Unit =Air temperature °C 11 Air temperature for extract air °C 12 Air temperature for exhaust air °C 21 Air temperature for outdoor air °C 22 Air temperature for supply air °C w11 Wet bulb temperature for extract air °C w21 Wet bulb temperature for outdoor air °C
Temperature ratio of the unit on exhaust air side
=Temperature ratio of the unit on supply air side
x, ex Humidity ratio of the unit on exhaust air side
x, su=Humidity ratio of the unit on supply air side
11 Extract air (see Figure 2)
SIST EN 13141-8:2014
EN 13141-8:2014 (E) 11 12 Exhaust air (see Figure 2)
21 Outdoor air (see Figure 2)
22 Supply air (see Figure 2)
C11 Concentration of tracer gas on extract air side using one of the test configuration a), b), c) or d) of Figure 2 or Figure 4 mg/m3 C22 Concentration of tracer gas on supply air side using one of the test configuration a), b), c) or d) of Figure 2 or Figure 4 mg/m3 C12 Concentration of tracer gas on exhaust air side using one of the test configuration a), b), c) or d) of Figure 2 or Figure 4 mg/m3 Dn,e Airborne sound insulation in third octave bands dB Dn,e,w Global airborne sound insulation index dB LW Sound power level dB LWA A-weighted sound power level dB PE Electric power input W ps Static pressure Pa qm Mass air flow rate kg.s−1 or g.s−1 qm11 Mass extract air flow rate kg.s−1 or g.s−1 qm12 Mass exhaust air flow rate kg.s−1 or g.s−1 qm21 Mass outdoor air flow rate kg.s−1 or g.s−1 qm22 Mass supply air flow rate kg.s−1 or g.s−1 qme Outdoor mixing (calculated) % qmi Indoor mixing m3.s−1 or l.s−1 qv Volume air flow rate m3.s−1 or l.s−1 qvd Maximum air flow rate m3.s−1 or l.s−1 qvmax Maximum air volume flow rate m3.s−1 or l.s−1 qve External leakage air volume flow rate m3.s−1 or l.s−1 qvi Internal leakage air volume flow rate m3.s−1 or l.s−1 qvio Average volume flow rate for alternating ventilation unit m3.s−1 or l.s−1 qvies Internal leakage from exhaust to supply flow m3.s−1 or l.s−1 qvise Internal leakage from supply to exhaust flow m3.s−1 or l.s−1 qvmeasured Measured air volume flow rate m3.s−1 or l.s−1 SIST EN 13141-8:2014
EN 13141-8:2014 (E) 12 qvref Reference air volume flow m3.s−1 or l.s−1 qvs Supply air volume flow m3.s−1 or l.s−1 R Recirculation fraction, measured with tracer gas test
t1 “On” period of the cycle with alternating ventilation units working in one way s t2 “Off” period of the cycle for alternating ventilation units s t3 “On” period of the cycle with alternating ventilation units working in the other way s t4 “Off” period of the cycle for alternating ventilation units s tcycle Time of an operating cycle for alternating ventilation units s x Water content kg water / kg dry air x11 Water content for extract air kg water / kg dry air x12 Water content for exhaust air kg water / kg dry air x21 Water content for outdoor air kg water / kg dry air x22 Water content for supply air kg water / kg dry air 5 Test methods 5.1 General Tests shall be conducted with a unit containing all components (including wall ducts and grilles, if applicable) as supplied for intended use, and installed according to the manufacturer's instructions. The mass flows qm11 and qm22 shall be balanced to within 3 % without any pressure difference between the two climatic test chambers unl
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