ISO INTERNATIONAL STANDARD 13370 Third edition 2017-06 Thermal performance of buildings Heat transfer via the ground - Calculation methods Performance thermique des batiments - Transfert de chaleur par le sol - Méthodes de calcul Reference number IS0 13370:2017(E) International Organization for Standardization @ IS0 2017 see=ZHEJIANG INST OF STANDARDIZATION C1 5956617 mitted without license from IHS IS0 13370:2017(E) COPYRIGHT PROTECTED DOCUMENT @ IS0 2017, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form written permission. Permission can be requested from either Iso at the address below or Iso's member body in the country of the requester. ISO copyrightoffice Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyright@iso.org www.iso.org Licensee-ZHEJIANG INST OF STANDARDIZoISQ37 -All rights reserved HS und Not for Resale, 2017/9/12 02:47:17 No reproduction or networking permited without license from IHS IS0 13370:2017(E) Contents Page Foreword ..V Introduction. ...vi 1 Scope. 2 Normative references 3 Terms and definitions 4 Symbols and subscripts. ..3 4.1 Symbols .3 4.2 Subscripts. .3 5 Description of the method ..4 5.1 Output. .4 5.2 General description. 5.3 Periodic coefficients. ..5 6 Calculation of heat transfer via the ground .5 6.1 Output data 6.2 Calculation time intervals .6 6.3 Input data. 6.4 Thermal properties. 7 6.4.1 Thermal properties of the ground .7 6.4.2 Thermal properties of building materials .8 6.4.3 Surface resistances. .8 6.5 Internal temperature and climatic data .8 6.5.1 Internal temperature.. ..8 6.5.2 Climatic data ..8 6.6 Thermal transmittance and heat flow rate 9 6.6.1 Thermal transmittance. .9 6.6.2 Thermal bridges at edge of floor 9 6.6.3 Calculation of heat flow rate. ..9 6.6.4 Effect of ground water. .9 6.6.5 Special cases .10 6.7 Parameters used in the calculations .10 6.7.1 Characteristic dimension of floor .10 6.7.2 Equivalent thickness.. .11 7 Calculation of thermal transmittances .11 7.1 Slab-on-ground floor. .11 7.2 Suspended floor ..13 7.3 Heated basement .15 7.3.1 General. .15 7.3.2 Basement floor .17 7.3.3 Basement walls ..17 7.3.4 Heat transfer from whole basement ..18 7.4 Unheated basement. ..18 7.5 Partly heated basement ..19 7.6 Effective thermal resistance of floor construction. .19 Annex A (normative) Input and method selection data sheet - Template ..20 Annex B (informative) Input and method selection data sheet Default choices ..23 Annex C (normative) Calculation of ground heat flow rate. ..26 Annex D (normative) Slab-on-ground with edge insulation. ...32 Annex E (informative) Heat flow rates for edge and central regions of a building Annex F (normative) Application to dynamic calculation programmes ..38 ntemaionalganzation7All rights reserved iii Licensee-ZHEJIANG INST OF STANDARDIZATION C1 5956617 with ISt ed without license from IHS Not for Resale, 2017/9/12 02:47:17