1、BRITISH STANDARDBS EN 15241:2007Ventilation for buildings Calculation methods for energy losses due to ventilation and infiltration in buildingsICS 91.140.30g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55
2、g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58Incorporating corrigendum2011FebruaryNational forewordThis British Standard is the UK implementation of EN 15241:2007, incorporating corrigendum February 2011.With respect to the Energy Performance of Buildings Directive (EPBD) requirements, a
3、ttention is drawn to the text of the fourth paragraph of the EN foreword. This recognizes at the present time that, if there is a conflict, existing national regulations take precedence over any requirements set out in this standard.The UK participation in its preparation was entrusted to Technical
4、Committee RHE/2, Ventilation for buildings, heating and hot water services.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct
5、application.Compliance with a British Standard cannot confer immunity from legal obligations.BS EN 15241:2007Amendments/corrigenda issued since publicationDate Comments 30 June 2011 Incorporation of CEN corrigendum February 2011: Modification of titleThis British Standard was published under the aut
6、hority of the Standards Policy and Strategy Committee on 31 July 2008 BSI 2011ISBN 978 0 580 74698 7EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 15241May 2007ICS 91.140.30English VersionVentilation for buildings - Calculation methods for energy lossesdue to ventilation and infiltration in build
7、ingsVentilation des btiments - Mthode de calcul des pertesdnergie dues la ventilation et aux infiltrations dans lesbtiments Lftung von Gebuden - Berechnungsverfahren fr denEnergieverlust aufgrund der Lftung und Infiltration inThis European Standard was approved by CEN on 26 March 2007.CEN members ar
8、e 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 th
9、e CEN 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 translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same st
10、atus as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania,
11、Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNG 2011 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 15241:2007: EIn
12、corporating corrigendum February 2011Management Centre: Avenue Marnix 17, B-1000 Brussels GebudenEN 15241:2007 (E) 2 Contents Page Foreword. 3 1 Scope 6 2 Normative references . 6 3 Terms and definitions. 6 4 Symbols and abbreviations . 7 5 General approach 8 6 Steady state calculation . 9 6.1 Basis
13、 of the calculation method 9 6.2 Air entering through infiltration, passive air inlets or windows 9 6.3 Air entering through balanced or supply only system calculation . 9 6.3.1 General. 9 6.3.2 Duct heat losses 10 6.3.3 Duct flow losses 10 6.3.4 Fan 10 6.3.5 heat exchanger 13 6.3.6 Mixing boxes . 1
14、5 6.3.7 Pre-heating 16 6.3.8 Pre-cooling 16 6.3.9 Humidifying in winter 17 6.3.10 Dehumidification . 17 7 Implementation of the method. 18 7.1 General. 18 7.2 Hourly method. 18 7.3 Monthly methods 19 7.3.1 System with no or low humidity impact .19 7.3.2 System with medium or high humidity impact 19
15、7.4 Statistical approach to be applied at national level 20 Annex A (informative) A simplified model of a Ground to Air Heat Exchanger. 21 A.1 Background and summary. 21 A.2 Overview of program links, variables, parameters and constants 22 A.3 Physical description of the ground to air heat x-change
16、model 23 Bibliography . 26 BS EN 15241:2007EN 15241:2007 (E) 3 Foreword This document (EN 15241:2007) 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, eit
17、her by publication of an identical text or by endorsement, at the latest by November 2007, and conflicting national standards shall be withdrawn at the latest by November 2007. This standard has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Associa
18、tion (Mandate M/343), and supports essential requirements of EU Directive 2002/91/EC on the energy performance of buildings (EPBD). It forms part of a series of standards aimed at European harmonisation of the methodology for the calculation of the energy performance of buildings. An overview of the
19、 whole set of standards is given in CEN/TR 15615, Explanation of the general relationship between various CEN standards and the Energy Performance of Buildings Directive (EPBD) (“Umbrella document“). Attention is drawn to the need for observance of relevant EU Directives transposed into national leg
20、al requirements. Existing national regulations with or without reference to national standards, may restrict for the time being the implementation of the European Standards mentioned in this report According to the CEN/CENELEC Internal Regulations, the national standards organizations of the followi
21、ng countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Sloven
22、ia, Spain, Sweden, Switzerland and United Kingdom. BS EN 15241:2007EN 15241:2007 (E) 4 Introduction This standard defines the way to calculate the energy impact of airflows due to the ventilation system. Ventilation system impact is calculated as direct (energy devoted to the air treatment and move
23、in the ventilation system), and indirect (impact on cooling and heating of the building). The relationships with some other standards are as follows: Figure 1 - Scheme of relationship between standards Table 1 - Relationship between standards from To Information transferred variables 15251 15243 Ind
24、oor climate requirements Heating and cooling Set points 13779 15251 15242 Airflow requirement for comfort and health Required supply and exhaust Air flows 15242 15241 Air flows Air flows entering and leaving the building 15241 13792 Air flows Air flow for summer comfort calculation 15241 15203- 1531
25、5 ;15217 energy Energies per energy carrier for ventilation (fans, humidifying, precooling, pre heating), + heating and cooling for air systems 15241 13790 data for heating and cooling calculation Temperatures, humilities and flows of air entering the building 15243 15243 Data for air systems Requir
26、ed energies for heating and cooling 15243 15242 Data for air heating and cooling systems Required airflows when of use 15243 13790 data for building heating and cooling calculation Set point, emission efficiency, distribution recoverable losses, generation recoverable losses 13790 15243 Data for sys
27、tem calculation Required energy for generation BS EN 15241:2007EN 15241:2007 (E) 5 EN titles are: prEN 15217, Energy performance of buildings Methods for expressing energy performance and for energy certification of buildings prEN 15603, Energy performance of buildings Overall energy use and definit
28、ion of energy ratings prEN 15243, Ventilation for buildings Calculation of room temperatures and of load and energy for buildings with room conditioning systems prEN ISO 13790, Thermal performance of buildings Calculation of energy use for space heating and cooling (ISO/DIS 13790:2005) EN 15242, Ven
29、tilation for buildings Calculation methods for the determination of air flow rates in buildings including infiltration EN 15241, Ventilation for buildings Calculation methods for energy losses due to ventilation and infiltration in commercial buildings EN 13779, Ventilation for non-residential build
30、ings Performance requirements for ventilation and room-conditioning systems EN 13792, Colour coding of taps and valves for use in laboratories EN 15251, Indoor environmental input parameters for design and assessment of energy performance of buildings addressing indoor air quality, thermal environme
31、nt, lighting and acoustics The target audience of this standard is policy makers in the building regulation sector, software developers of building simulation tools, industrial and engineering companies. BS EN 15241:2007EN 15241:2007 (E) 6 1 Scope This European Standard describes the method to calcu
32、late the energy impact of ventilation systems (including airing) in buildings to be used for applications such as energy calculations, heat and cooling load calculation. Its purpose is to define how to calculate the characteristics (temperature, humidity) of the air entering the building, and the co
33、rresponding energies required for its treatment and the auxiliaries electrical energy required. This standard can also be used for air heating and cooling systems when they assure the provision of ventilation, considering that prEN 15243 will provide the required heating or cooling load and the corr
34、esponding air flows and/or air temperatures. 2 Normative references The following referenced documents 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 am
35、endments) applies. EN 12792:2003, Ventilation for buildings Symbols, terminology and graphical symbols EN 13053:2006, Ventilation for buildings Air handling units Rating and performance for units, components and sections EN 13779, Ventilation for non-residential buildings Performance requirements fo
36、r ventilation and room-conditioning systems prEN 15232, Energy performance of buildings Impact of Building Automation, Controls and Building Management EN 15242, Ventilation for buildings Calculation methods for the determination of air flow rates in buildings including infiltration prEN 15243, Vent
37、ilation for buildings Calculation of room temperatures and of load and energy for buildings with room conditioning systems prEN ISO 13790, Thermal performance of buildings Calculation of energy use for space heating and cooling (ISO/DIS 13790:2005) 3 Terms and definitions For the purposes of this do
38、cument the terms and definitions given in EN 12792:2003 and the following apply. 3.1 defrosting coil coil used before the heat exchanger to prevent its frosting 3.2 pre-heating coil coil used to warm up the air entering the supply ducted system to a predefined value (e.g.; not controlled according t
39、o indoor temperature) 3.3 pre-cooling coil coil used to cool down the air entering the supply ducted system to a predefined value BS EN 15241:2007EN 15241:2007 (E) 7 3.4 building height height of the building from the entrance ground level to the roof top level 3.5 building leakage overall leakage a
40、irflow for a given test pressure difference across building 3.6 building volume volume within internal outdoor walls of the purposely conditioned space of the building (or part of the building). This generally includes neither the attic, nor the basement, nor any additional structural annex of the b
41、uilding 3.7 building air temperature average air temperature of the rooms 4 Symbols and abbreviations Table 2 symbols and abbreviations Symbol Unit descriptionA m area Bh m building height Cductleakad coefficient taking into account lost air due to duct leakages Csystad coefficient taking into accou
42、nt the component and system design tolerances Cusead coefficient taking into account the switching on and off of fans Ccontad coefficient depending on local air flow control Eff ad efficiency H W/K heat lossqv(dP) curve or airflow/pressure difference characteristic formula qv4Pa,n or m3/h external e
43、nveloppe airtightness expressed as an airflow for a given pressure n50,n difference, exponent qv4Pa,n or m3/h partial air tightnesss for altitude (z), orientation (or), tilt angle (Tilt) n50,n qv-exhm3/h exhaust air flow qv-supm3/h supply air flow P W heating powerR Ad ratio C temperature x g/kg of
44、dry air moisture content of the air BS EN 15241:2007EN 15241:2007 (E) 8 Table 3 Indices used in the documents sup Concerns supply air as defined in EN 13779 rec Concerns recirculation exh Concerns exhaust air as defined in EN 13779 ductsurr Concerns air surrounding the duct e1 Concerns exhaust air e
45、ntering unit e2 Concerns exhaust air at units exit s1 Concerns supply air entering unit s2 Concerns supply air at units exit PC Concerns precooling PH Concerns pre-heating hum Concerns humidifying Fan or f Concerns fan HE Concerns heat exchanger f,r Concerns heat recovered from fan ext external int
46、internal duct Concerns the duct cont control 5 General approach EN 15242 defines the procedure to calculate the following air flows (either entering or leaving the heated/conditioned area) through leakages, opened windows, purpose provided openings (considered as part of the ventilation system) and
47、the ventilation system. For overall heating and cooling needs calculation, prEN ISO 13790, uses directly the airflows entering the building through leakages, opened windows, and purpose provided opening, as theres is no additional energy impact when these air flows are known. Therefore this standard
48、 focuses on the impact on the ventilation system itself both for the air treatment and move. For air heating and cooling system, prEN 15243 provides the required airflow and supply temperatures. 23415Key 1 ventilation system 4 leakage 2 window opening 5 internal reference pressure 3 opening Figure 2
49、 general scheme for airflows BS EN 15241:2007EN 15241:2007 (E) 9 The ventilation system here considered does not directly include room controlled heating and cooling, but only preheating and precooling coils. The local heating or cooling system description and calculation is not considered directly. Its possible impact on the exhaust air temperature or on the required airflows set points and controls can nevertheless be taken into account. The aim of this standard is therefore to provide the “air information“ for heating and co
