ISO 13789:2017
Thermal performance of buildings — Transmission and ventilation heat transfer coefficients — Calculation method
ISO 13789:2017 specifies a method and provides conventions for the calculation of the steady‐state transmission and ventilation heat transfer coefficients of whole buildings and parts of buildings. It is applicable both to heat loss (internal temperature higher than external temperature) and to heat gain (internal temperature lower than external temperature). For the purpose of ISO 13789:2017, the heated or cooled space is assumed to be at uniform temperature.
Annex C provides a steady‐state method to calculate the temperature in unconditioned spaces adjacent to conditioned spaces.
NOTE Table 1 in the Introduction shows the relative position of ISO 13789:2017 within the set of EPB standards in the context of the modular structure as set out in ISO 52000-1.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and subscripts
4.1 Symbols
4.2 Subscripts
5 Description of the method
5.1 Output
5.2 General description
6 Calculation of heat transfer coefficients
6.1 Output data
6.2 Calculation time intervals
6.3 Input data
6.4 Measurement of dimensions
6.5 Boundaries of conditioned space
7 Transmission heat transfer coefficient
7.1 Basic formula
7.2 Mean thermal transmittance of building fabric
7.3 Direct transmission between internal and external environments
7.4 Transmission heat transfer coefficient through the ground
7.5 Transmission heat transfer coefficient through unconditioned spaces
7.6 Heat transfer to adjacent buildings
8 Ventilation heat transfer coefficient
9 Additional conventions
9.1 General
9.2 Transmission heat transfer coefficient through the ground
9.3 Variable thermal transmittance
9.4 Air change rates of unconditioned spaces
9.5 Conventional values of surface heat transfer coefficient
10 Report
Annex A (normative) Input and method selection data sheet — Template
Annex B (informative) Input and method selection data sheet — Default choices
Annex C (normative) Temperature in an unconditioned space
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and subscripts
4.1 Symbols
4.2 Subscripts
5 Description of the method
5.1 Output
5.2 General description
6 Calculation of heat transfer coefficients
6.1 Output data
6.2 Calculation time intervals
6.3 Input data
6.4 Measurement of dimensions
6.5 Boundaries of conditioned space
7 Transmission heat transfer coefficient
7.1 Basic formula
7.2 Mean thermal transmittance of building fabric
7.3 Direct transmission between internal and external environments
7.4 Transmission heat transfer coefficient through the ground
7.5 Transmission heat transfer coefficient through unconditioned spaces
7.6 Heat transfer to adjacent buildings
8 Ventilation heat transfer coefficient
9 Additional conventions
9.1 General
9.2 Transmission heat transfer coefficient through the ground
9.3 Variable thermal transmittance
9.4 Air change rates of unconditioned spaces
9.5 Conventional values of surface heat transfer coefficient
10 Report
Annex A (normative) Input and method selection data sheet — Template
Annex B (informative) Input and method selection data sheet — Default choices
Annex C (normative) Temperature in an unconditioned space
Bibliography