1、BRITISH STANDARDBS EN 15255:2007Energy performance of buildings Sensible room cooling load calculation General criteria and validation proceduresThe European Standard EN 15255:2007 has the status of a British StandardICS 91.120.10; 91.140.99g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g5
2、4g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 15255:2007This British Standard was published under the authority of the Standards Policy and Strategy Committee on 28 September 2007 BSI 2007ISBN 978 0
3、580 55448 3National forewordThis British Standard is the UK implementation of EN 15255:2007.The UK participation in its preparation was entrusted to Technical Committee B/540, Energy performance of materials components and buildings.A list of organizations represented on this committee can be obtain
4、ed 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 application.Compliance with a British Standard cannot confer immunity from legal obligations. Amendments issued since publicationAmd. No. Date
5、 CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 15255August 2007ICS 91.140.99; 91.120.10English VersionEnergy performance of buildings - Sensible room cooling loadcalculation - General criteria and validation proceduresPerformance thermique des btiments - Calcul de la chargede refroidisse
6、ment en chaleur sensible dun local - Critresgnraux et procdures de validationWrmetechnisches Verhalten von Gebuden - Berechnungder wahrnehmbaren Raumkhllast - Allgemeine Kriterienund ValidierungsverfahrenThis European Standard was approved by CEN on 6 July 2007.CEN members are bound to comply with t
7、he 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 CEN Management Centre
8、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 status as theofficial vers
9、ions.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, Slovakia, Slovenia, Spai
10、n, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2007 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Membe
11、rs.Ref. No. EN 15255:2007: EEN 15255:2007 (E) 2 Contents Page Foreword3 Introduction .4 1 Scope 5 2 Normative references 5 3 Terms, definitions, symbols and units 6 3.1 Terms and definitions .6 3.2 Symbols and units.8 3.3 Subscripts 9 4 Basic assumptions 10 5 Data requirement .10 5.1 General10 5.2 C
12、limatic data.11 5.3 Descriptions of the envelope elements.11 5.3.1 General11 5.3.2 Boundary conditions.11 5.3.3 Heat transfer coefficients12 5.3.4 Geometrical and thermophysical parameters of the room envelope.13 5.4 Cooling system device14 5.4.1 General14 5.4.2 Convective device14 5.4.3 Cooled surf
13、ace device.14 5.5 Classification of the cooling load calculation method 15 6 Report of the calculation.15 6.1 General15 6.2 Input data15 6.3 Output data.16 7 Validation procedures .16 7.1 General16 7.2 Reference room17 7.3 Climatic data.21 7.4 Test cases.23 7.5 Parameters to be calculated.28 7.6 Tes
14、t results.29 Annex A (informative) Example of calculation method based on a simplified model .30 A.1 Introduction30 A.2 Calculation of internal air and operative temperatures for a given value of applied cooling power 30 A.2.1 Presentation .30 A.2.2 Determination of the air and operative temperature
15、s32 A.2.3 Terms in Equations (A.1), (A.2), (A.3), (A.4) and (A.5)34 A.3 Calculation of internal temperatures and required cooling power.38 A.3.1 General description .38 A.3.2 Calculation procedure for control on air temperature.42 A.3.3 Calculation procedure for control on operative temperature .43
16、Bibliography 45 EN 15255:2007 (E) 3 Foreword This document (EN 15255:2007) has been prepared by Technical Committee CEN/TC 89 “Thermal performance of buildings and building components”, the secretariat of which is held by SIS. This European Standard shall be given the status of a national standard,
17、either by publication of an identical text or by endorsement, at the latest by February 2008, and conflicting national standards shall be withdrawn at the latest by February 2008. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Asso
18、ciation (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
19、the whole set of standards is given in prCEN/TR 15615. Attention is drawn to the need for observance of EU Directives transposed into national legal requirements. Existing national regulations (with or without reference to national standards) may restrict for the time being the implementation of thi
20、s European Standard. This European Standard is one of a series of standards on general criteria and validation procedures for transient calculation methods for the design and the evaluation of the thermal and energy performance of buildings and building components. No existing European Standard is s
21、uperseded. The target audience of this European Standard are software developers of building simulation tools and policy makers in the building regulation sector. The standard specifies the boundary conditions and the simplifications needed to reach calculation results for the building part which ar
22、e comparable. It needs to be emphasized that there exist more sophisticated energy simulation methods and procedures including interactions with the heating, cooling, ventilating and lighting systems which may be used for the design and optimization process of a building but are not in line with exi
23、sting European Standards. This European Standard provides the means (in part) to assess the contribution that building products and services make to energy conservation and to the overall energy performance of buildings. According to the CEN/CENELEC Internal Regulations, the national standards organ
24、izations of the following 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, Ro
25、mania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 15255:2007 (E) 4 Introduction The proper design and sizing of air conditioning systems requires the calculation of the cooling load in the space to be conditioned (room cooling load). The variables affecting the room coolin
26、g load calculation are numerous, often difficult to define precisely and always intricately inter-related. Many cooling load components vary widely in magnitude during a 24-hour period. Since these cyclic changes are often out of phase with each other, they need to be analyzed to establish the maxim
27、um room cooling load for a building or zone. The maximum cooling capacity for a zoned building is the largest hourly total of the simultaneous zone loads throughout a design day; but it needs to handle the peak cooling load for each zone at its peak hour. This means that a calculation method needs t
28、o be able to determine the cooling load of each zone throughout the calculation period. A large number of calculation methods are available in Europe. These methods generally are based on different solution techniques that include simplifications of the real phenomena. According to those simplificat
29、ions they are able to consider specific or general situations. One specific situation is represented by the calculation of the maximum peak load of a single zone for convective source with the control of the air temperature. This European Standard includes the criteria and the level of input and out
30、put data required for a simplified calculation method of the cooling load of a single room. A simplified load calculation method is given in the informative Annex A. Any calculation method satisfies the standard if it complies with the assumptions, data requirements and the validation procedures des
31、cribed in Clause 7. The series of European Standards, giving general criteria and validation procedures for the building part of energy simulation models for the different calculation subjects, are listed below. European Standard Subject EN ISO 13791 EN ISO 13792 Temperature calculations (air and op
32、erative) EN 15255 Load calculations (sensible cooling) EN 15265 Energy need calculations (heating and cooling) EN 15255:2007 (E) 5 1 Scope This European Standard sets out the level of input and output data, and prescribes the boundary conditions required for a calculation method of the sensible cool
33、ing load of a single room under constant and/or floating temperature taking into account the limit of the peak cooling load of the system. It includes a classification scheme of the calculation method and the criteria to be met by a calculation method in order to comply with this European Standard.
34、The purpose of this European Standard is to validate calculation methods used to: evaluate the maximum cooling load for equipment selection and cooling system design; evaluate the temperature profile when the cooling capacity of the system is reduced; provide data for evaluation of the optimum possi
35、bilities for load reduction; allow analysis of partial loads as required for system design, operation and control. The validation procedure is used to check the room sensible heat balance model, taking into account: the external surface heat balance; the conduction through the building envelope; the
36、 effect of the thermal mass of the structures; the internal surface heat balance; the air heat balance; the heat balance solution method. All other aspects are given either by fixed boundary conditions or by input data and are not in the focus of the model validation. It is assumed that for all thes
37、e other matters e.g. embedded heating and cooling systems, prescriptive models have to be used according to existing European Standards. Informative Annex A gives a simplified method for cooling load calculation. 2 Normative references The following referenced documents are indispensable for the app
38、lication 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 410, Glass in building Determination of luminous and solar characteristics of glazing EN 13363-2, Solar protec
39、tion devices combined with glazing Calculation of total solar energy transmittance and light transmittance Part 2: Detailed calculation method EN 15377-1, Heating systems in buildings Design of embedded water based surface heating and cooling systems Part 1: Determination of the design heating and c
40、ooling capacity prEN ISO 6946, Building components and building elements Thermal resistance and thermal transmittance Calculation method (ISO/DIS 6946:2005) EN 15255:2007 (E) 6 EN ISO 7345:1995, Thermal insulation Physical quantities and definitions (ISO 7345:1987) EN ISO 9251:1995, Thermal insulati
41、on Heat transfer conditions and properties of materials Vocabulary (ISO 9251:1987) EN ISO 9288:1996, Thermal insulation Heat transfer by radiation Physical quantities and definitions (ISO 9288:1989) prEN ISO 9346:2007, Hygrothermal performance of buildings and building materials Physical quantities
42、for mass transfer Vocabulary (ISO/DIS 9346:2005) EN ISO 10077-1, Thermal performance of windows, doors and shutters Calculation of thermal transmittance Part 1: General (ISO 10077-1:2006) prEN ISO 13370, Thermal performance of buildings Heat transfer via the ground Calculation methods (ISO/DIS 13370
43、:2005) prEN ISO 13786, Thermal performance of building components Dynamic thermal characteristics Calculation methods (ISO/ 13786:1999) EN ISO 13792:2005, Thermal performance of buildings Calculation of internal temperatures of a room in summer without mechanical cooling Simplified methods (ISO 1379
44、2:2005) 3 Terms, definitions, symbols and units 3.1 Terms and definitions For the purposes of this document, the terms and definitions given in EN ISO 7345:1995, EN ISO 9288:1996, EN ISO 9251:1995, prEN ISO 9346:2007 and the following apply. 3.1.1 internal environment closed space delimited from the
45、 external environment or adjacent spaces by a building fabric component 3.1.2 envelope element element of a building fabric delimited by two parallel surfaces, one of them is exposed to the room under consideration 3.1.3 room air air of the internal environment 3.1.4 internal air temperature tempera
46、ture of the room air 3.1.5 internal surface temperature temperature of the internal surface of each element of the envelope 3.1.6 mean radiant temperature uniform surface temperature of an enclosure in which an occupant would exchange the same amount of radiant heat as in the actual non-uniform encl
47、osure EN 15255:2007 (E) 7 3.1.7 operative temperature uniform temperature of an enclosure in which an occupant would exchange the same amount of heat by radiation plus convection as in the actual non-uniform environment NOTE As approximation, the operative temperature is calculated as mean value of
48、the air temperature and the mean radiant temperature. 3.1.8 thermal source component which exchanges heat with the internal environment 3.1.8.1 convective thermal source thermal source that exchanges heat only with the air 3.1.8.2 surface source thermal source that exchanges heat with the surroundin
49、g surfaces by long-wave radiation and with the air by convection 3.1.9 internal design temperature internal temperature assumed as reference for the system control. NOTE The internal design temperature may be the internal air temperature or the operative temperature. EN 15255:2007 (E) 8 3.2 Symbols and units The principal symbols used are listed in the following table. Other symbols are defined where they are used within the standard. Symbol Quantity Unit A area m2Assunlit area m2cpspecific heat capacity of a
