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1、BRITISH STANDARD BS EN 15255:2007 Energy performance of buildings Sensible room cooling load calculation General criteria and validation procedures The European Standard EN 15255:2007 has the status of a British Standard ICS 91.120.10; 91.140.99 ? Licensed Copy: London South Bank University, London
2、South Bank University, Fri Oct 05 03:01:23 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS EN 15255:2007 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 28 September 2007 BSI 2007 ISBN 978 0 580 55448 3 National foreword This British Standard i
3、s 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 obtained on request to its secretary. This publication
4、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 publication Amd. No. DateComments Licensed Copy: London South Bank Univ
5、ersity, London South Bank University, Fri Oct 05 03:01:23 GMT+00:00 2007, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 15255 August 2007 ICS 91.140.99; 91.120.10 English Version Energy performance of buildings - Sensible room cooling load calculation - General crit
6、eria and validation procedures Performance thermique des btiments - Calcul de la charge de refroidissement en chaleur sensible dun local - Critres gnraux et procdures de validation Wrmetechnisches Verhalten von Gebuden - Berechnung der wahrnehmbaren Raumkhllast - Allgemeine Kriterien und Validierung
7、sverfahren This European Standard was approved by CEN on 6 July 2007. 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 bibliographi
8、cal references concerning such national standards may be obtained on application to the 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 translation under the responsibility of a CE
9、N member into its own language and notified to the CEN Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, I
10、taly, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B
11、-1050 Brussels 2007 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 15255:2007: E Licensed Copy: London South Bank University, London South Bank University, Fri Oct 05 03:01:23 GMT+00:00 2007, Uncontrolled Copy, (c) BSI EN 15255:200
12、7 (E) 2 Contents Page Foreword3 Introduction.4 1 Scope 5 2 Normative references5 3 Terms, definitions, symbols and units6 3.1 Terms and definitions .6 3.2 Symbols and units.8 3.3 Subscripts 9 4 Basic assumptions10 5 Data requirement .10 5.1 General10 5.2 Climatic data.11 5.3 Descriptions of the enve
13、lope 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 surface device.14 5.5 Classification of the cool
14、ing 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 Test results.29 Annex A (informative) Example of
15、 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 temperatures32 A.2.3 Terms in Equations (A.1), (A.2), (A.
16、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 Bibliography45 Licensed Copy: London South Bank
17、 University, London South Bank University, Fri Oct 05 03:01:23 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 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
18、 is held by SIS. 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 February 2008, and conflicting national standards shall be withdrawn at the latest by February 2008. This document has been prepare
19、d under a mandate given to CEN by the European Commission and the European Free Trade Association (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 t
20、he methodology for the calculation of the energy performance of buildings. An overview of 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
21、reference to national standards) may restrict for the time being the implementation of this 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 e
22、nergy performance of buildings and building components. No existing European Standard is superseded. 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
23、and the simplifications needed to reach calculation results for the building part which are 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
24、be used for the design and optimization process of a building but are not in line with existing 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
25、buildings. 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, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Irela
26、nd, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Licensed Copy: London South Bank University, London South Bank University, Fri Oct 05 03:01:23 GMT+00:00 2007, Uncontrolled Copy, (c) BS
27、I 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 cooling load calculation are numerous, often difficult to define precisely and
28、 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 maximum room cooling load for a building or zone. The maximum cooling capacit
29、y 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 to be able to determine the cooling load of each zone throughout the calc
30、ulation 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 simplifications they are able to consider specific or general situations. One speci
31、fic 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 output data required for a simplified calculation method of the cooling loa
32、d 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 described in Clause 7. The series of European Standards, giving general cri
33、teria 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 operative) EN 15255 Load calculations (sensible cooling) EN 15265 Energy n
34、eed calculations (heating and cooling) Licensed Copy: London South Bank University, London South Bank University, Fri Oct 05 03:01:23 GMT+00:00 2007, Uncontrolled Copy, (c) BSI EN 15255:2007 (E) 5 1 Scope This European Standard sets out the level of input and output data, and prescribes the boundary
35、 conditions required for a calculation method of the sensible cooling 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 c
36、alculation method in order to comply with this European Standard. 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 s
37、ystem is reduced; provide data for evaluation of the optimum possibilities 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 surfa
38、ce heat balance; the conduction through the building envelope; the 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
39、the focus of the model validation. It is assumed that for all these 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 reference
40、s 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 amendments) applies. EN 410, Glass in building Determination of lumi
41、nous and solar characteristics of glazing EN 13363-2, Solar protection 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
42、 cooling systems Part 1: Determination of the design heating and cooling capacity prEN ISO 6946, Building components and building elements Thermal resistance and thermal transmittance Calculation method (ISO/DIS 6946:2005) Licensed Copy: London South Bank University, London South Bank University, Fr
43、i Oct 05 03:01:23 GMT+00:00 2007, Uncontrolled Copy, (c) BSI EN 15255:2007 (E) 6 EN ISO 7345:1995, Thermal insulation Physical quantities and definitions (ISO 7345:1987) EN ISO 9251:1995, Thermal insulation Heat transfer conditions and properties of materials Vocabulary (ISO 9251:1987) EN ISO 9288:1
44、996, 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 for mass transfer Vocabulary (ISO/DIS 9346:2005) EN ISO 10077-1, Thermal performance of windows,
45、 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 13370:2005) prEN ISO 13786, Thermal performance of building components Dynamic thermal characteristic
46、s 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 13792:2005) 3 Terms, definitions, symbols and units 3.1 Terms and definitions For the purposes of th
47、is 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 external environment or adjacent spaces by a building fabric component 3.1.2 envelope element e
48、lement 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 temperature of the room air 3.1.5 internal surface temperature temperature of the internal surface of e
49、ach 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 enclosure Licensed Copy: London South Bank University, London South Bank University, Fri Oct 05 03:01:23 GMT+00:00 2007, Uncontrolled Copy, (c) BSI EN 15255:2007 (E) 7 3.1.7 operative temperature uniform temperature of an enclosure in which