1、BSI Standards PublicationBS EN ISO 11855-2:2015Building environment design Design, dimensioning,installation and control ofembedded radiant heating andcooling systemsPart 2: Determination of the design heatingand cooling capacity (ISO 11855-2:2012)BS EN ISO 11855-2:2015 BRITISH STANDARDNational fore
2、wordThis British Standard is the UK implementation of EN ISO11855-2:2015. It is identical to ISO 11855-2:2012.The UK participation in its preparation was entrusted to TechnicalCommittee RHE/24, Central heating installations.A list of organizations represented on this committee can beobtained on requ
3、est to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2015. Published by BSI StandardsLimited 2015ISBN 978 0 580 88071 1ICS 91.040.01; 91.140.10; 91.140.30Compli
4、ance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 August 2015.Amendments issued since publicationDate Text affectedBS EN ISO 11855-2:2015EUROPEAN STANDARD NORME EUROPEN
5、NE EUROPISCHE NORM EN ISO 11855-2 August 2015 ICS 91.140.10; 91.140.30 English Version Building environment design - Design, dimensioning, installation and control of embedded radiant heating and cooling systems - Part 2: Determination of the design heating and cooling capacity (ISO 11855-2:2012) Co
6、nception de lenvironnement des btiments - Conception, dimensionnement, installation et contrle des systmes intgrs de chauffage et de refroidissement par rayonnement - Partie 2 : Dtermination de la puissance calorifique et frigorifique la conception (ISO 11855-2:2012) Umweltgerechte Gebudeplanung - P
7、lanung, Auslegung, Installation und Steuerung flchenintegrierter Strahlheizungs- und -khlsysteme - Teil 2: Bestimmung der Auslegungs-Heiz- bzw. Khlleistung (ISO 11855-2:2012)012) This European Standard was approved by CEN on 30 July 2015. CEN members are bound to comply with the CEN/CENELEC Internal
8、 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
9、 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 versio
10、ns. 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, Po
11、land, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CEN All rights of exploitatio
12、n in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 11855-2:2015 EBS EN ISO 11855-2:2015ISO 11855-2:2012(E) ISO 2012 All rights reserved iiiContents Page Foreword iv Introduction . v 1 Scope 1 2 Normative references 1 3 Terms and definitions . 2 4 Symbols and
13、abbreviations 2 5 Concept of the method to determine the heating and cooling capacity . 3 6 Heat exchange coefficient between surface and space 4 7 Simplified calculation methods for determining heating and cooling capacity or surface temperature 6 7.1 Universal single power function 7 7.2 Thermal r
14、esistance methods 9 8 Use of basic calculation programs 11 8.1 Basic calculation programs . 11 8.2 Items to be included in a complete computation documentation 11 9 Calculation of the heating and cooling capacity 12 Annex A (normative) Calculation of the heat flux . 13 Annex B (normative) General re
15、sistance method . 36 Annex C (normative) Pipes embedded in wooden construction . 42 Annex D (normative) Method for verification of FEM and FDM calculation programs 50 Annex E (normative) Values for heat conductivity of materials and air layers 54 Bibliography 56 BS EN ISO 11855-2:2015ISO 11855-2:201
16、2(E) iv ISO 2012 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body i
17、nterested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechn
18、ical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by th
19、e technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights
20、. ISO shall not be held responsible for identifying any or all such patent rights. ISO 11855-2 was prepared by Technical Committee ISO/TC 205, Building environment design. ISO 11855 consists of the following parts, under the general title Building environment design Design, dimensioning, installatio
21、n and control of embedded radiant heating and cooling systems: Part 1: Definition, symbols, and comfort criteria Part 2: Determination of the design and heating and cooling capacity Part 3: Design and dimensioning Part 4: Dimensioning and calculation of the dynamic heating and cooling capacity of Th
22、ermo Active Building Systems (TABS) Part 5: Installation Part 6: Control Part 1 specifies the comfort criteria which should be considered in designing embedded radiant heating and cooling systems, since the main objective of the radiant heating and cooling system is to satisfy thermal comfort of the
23、 occupants. Part 2 provides steady-state calculation methods for determination of the heating and cooling capacity. Part 3 specifies design and dimensioning methods of radiant heating and cooling systems to ensure the heating and cooling capacity. Part 4 provides a dimensioning and calculation metho
24、d to design Thermo Active Building Systems (TABS) for energy-saving purposes, since radiant heating and cooling systems can reduce energy consumption and heat source size by using renewable energy. Part 5 addresses the installation process for the system to operate as intended. Part 6 shows a proper
25、 control method of the radiant heating and cooling systems to ensure the maximum performance which was intended in the design stage when the system is actually being operated in a building. BS EN ISO 11855-2:2015ISO 11855-2:2012(E) ISO 2012 All rights reserved vIntroduction The radiant heating and c
26、ooling system consists of heat emitting/absorbing, heat supply, distribution, and control systems. The ISO 11855 series deals with the embedded surface heating and cooling system that directly controls heat exchange within the space. It does not include the system equipment itself, such as heat sour
27、ce, distribution system and controller. The ISO 11855 series addresses an embedded system that is integrated with the building structure. Therefore, the panel system with open air gap, which is not integrated with the building structure, is not covered by this series. The ISO 11855 series shall be a
28、pplied to systems using not only water but also other fluids or electricity as a heating or cooling medium. The object of the ISO 11855 series is to provide criteria to effectively design embedded systems. To do this, it presents comfort criteria for the space served by embedded systems, heat output
29、 calculation, dimensioning, dynamic analysis, installation, operation, and control method of embedded systems. BS EN ISO 11855-2:2015BS EN ISO 11855-2:2015INTERNATIONAL STANDARD ISO 11855-2:2012(E) ISO 2012 All rights reserved 1Building environment design Design, dimensioning, installation and contr
30、ol of embedded radiant heating and cooling systems Part 2: Determination of the design heating and cooling capacity 1 Scope This part of ISO 11855 specifies procedures and conditions to enable the heat flow in water based surface heating and cooling systems to be determined relative to the medium di
31、fferential temperature for systems. The determination of thermal performance of water based surface heating and cooling systems and their conformity to this part of ISO 11855 is carried out by calculation in accordance with design documents and a model. This should enable a uniform assessment and ca
32、lculation of water based surface heating and cooling systems. The surface temperature and the temperature uniformity of the heated/cooled surface, nominal heat flow density between water and space, the associated nominal medium differential temperature, and the field of characteristic curves for the
33、 relationship between heat flow density and the determining variables are given as the result. This part of ISO 11855 includes a general method based on Finite Difference or Finite Element Methods and simplified calculation methods depending on position of pipes and type of building structure. The I
34、SO 11855 series is applicable to water based embedded surface heating and cooling systems in residential, commercial and industrial buildings. The methods apply to systems integrated into the wall, floor or ceiling construction without any open air gaps. It does not apply to panel systems with open
35、air gaps which are not integrated into the building structure. The ISO 11855 series also applies, as appropriate, to the use of fluids other than water as a heating or cooling medium. The ISO 11855 series is not applicable for testing of systems. The methods do not apply to heated or chilled ceiling
36、 panels or beams. 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 amendments) applies. ISO 1185
37、5-1:2012, Building environment design Design, dimensioning, installation and control of embedded radiant heating and cooling systems Part 1: Definition, symbols, and comfort criteria EN 1264-2, Water based surface embedded heating and cooling systems Part 2: Floor heating: Prove methods for the dete
38、rmination of the thermal output using calculation and test methods BS EN ISO 11855-2:2015ISO 11855-2:2012(E) 2 ISO 2012 All rights reserved3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 11855-1:2012 apply. 4 Symbols and abbreviations For the purpose
39、s of this document, the symbols and abbreviations in Table 1 apply. Table 1 Symbols and abbreviations Symbol Unit Quantity i Parameter factors for calculation of characteristic curves AAm2Surface of the occupied area AF2Surface of the heating/cooling surface area ARm2Surface of the peripheral area b
40、u Calculation factor depending on the pipe spacing B, BG, B0W/(m2K) Coefficients depending on the system D m External diameter of the pipe, including sheathing where used dam External diameter of the pipe dim Internal diameter of the pipe dMm External diameter of sheathing cWkJ/(kgK) Specific heat c
41、apacity of water htW/(m2K) Total heat exchange coefficient (convection + radiation) between surface and space KHW/(m2K) Equivalent heat transmission coefficient KWL Parameter for heat conducting devices kfin Parameter for heat conducting devices kCL Parameter for heat conducting layer LWLm Width of
42、heat conducting devices Lfinm Width of fin (horizontal part of heat conducting device seen as a heating fin) LRm Length of installed pipes m Exponents for determination of characteristic curves mHkg/s Design heating/cooling medium flow rate n, nG Exponents q W/m2Heat flux at the surface qAW/m2Heat f
43、lux in the occupied area qdesW/m2Design heat flux qGW/m2Limit heat flux qNW/m2Nominal heat flux qRW/m2Heat flux in the peripheral area quW/m2Outward heat flux Rom2K/W Partial inwards heat transmission resistance of surface structure Rum2K/W Partial outwards heat transmission resistance of surface st
44、ructure R,Bm2K/W Thermal resistance of surface covering BS EN ISO 11855-2:2015ISO 11855-2:2012(E) ISO 2012 All rights reserved 3R,insm2K/W Thermal resistance of thermal insulation shm In Type B systems, thickness of thermal insulation from the outward edge of the insulation to the inward edge of the
45、 pipes (see Figure 2) slm In Type B systems, thickness of thermal insulation from the outward edge of the insulation to the outward edge of the pipes (see Figure 2) sinsm Thickness of thermal insulation sRm Pipe wall thickness sum Thickness of the layer above the pipe sWLm Thickness of heat conducti
46、ng device S m Thickness of the screed (excluding the pipes in type A systems) W m Pipe spacing W/(m2K) Heat exchange coefficient s,maxC Maximum surface temperature s,minC Minimum surface temperature iC Design indoor temperature mC Temperature of the heating/cooling medium RC Return temperature of he
47、ating/cooling medium VC Supply temperature of heating/cooling medium uC Indoor temperature in an adjacent space HK Heating/cooling medium differential temperature H,desK Design heating/cooling medium differential temperature H,GK Limit of heating/cooling medium differential temperature NK Nominal he
48、ating/cooling medium differential temperature VK Heating/cooling medium differential supply temperature V,desK Design heating/cooling medium differential supply temperature W/(mK) Thermal conductivity K Temperature drop VR Conversion factor for temperatures Content by volume of the attachment burrs
49、in the screed 5 Concept of the method to determine the heating and cooling capacity A given type of surface (floor, wall, ceiling) delivers, at a given average surface temperature and indoor temperature (operative temperature i), the same heat flux in any space independent of the type of embedded system. It is therefore possible to establish a basic formula or characteristic curve for cooling and a basic formula or characteristic curve for heating, for each of
