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BS EN 15026:2023 – TC

BS EN 15026:2023 – TC

$258.95

Tracked Changes. Hygrothermal performance of building components and building elements. Assessment of moisture transfer by numerical simulation

Published By Publication Date Number of Pages
BSI 2023 116
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This document specifies the model components to be used in a numerical hygrothermal simulation model for calculating the transient transfer of heat and moisture through building structures. This document specifies a method to be used for validating a numeric hygrothermal simulation model claiming conformity with this document.

PDF Catalog

PDF Pages PDF Title
66 undefined
74 1 Scope
2 Normative references
3 Terms, definitions, symbols and units
76 4 Hygrothermal formulae and material properties
4.1 Assumptions
77 4.2 Balance formulae
4.2.1 General
4.2.2 Internal energy density
78 4.2.3 Additional source terms
4.3 Relations between driving potentials and conserved quantities
4.4 Transport of heat and moisture
4.4.1 General
4.4.2 Heat and enthalpy transport inside materials
79 4.4.3 Moisture transport
80 4.4.4 Moisture transport across material interfaces/vapour retarders/foils
81 4.4.5 Internal air layers
4.5 Material properties
5 Boundary and initial conditions
5.1 Inside conditions
5.1.1 Usage conditions
82 5.1.2 Parameters
5.1.3 Sources of data
5.2 Outside conditions
5.2.1 Sources of data
83 5.2.2 Climate parameters
5.3 Interpolation of tabulated climatic data
84 5.4 Boundary heat and moisture flows
5.4.1 Heat transfer
5.4.1.1 General
5.4.1.2 Imposed surface temperature
5.4.1.3 Heat convection
85 5.4.1.4 Solar radiation
86 5.4.1.5 Long-wave radiation balance
87 5.4.2 Vapour diffusion
5.4.3 Convective latent heat flow
5.4.4 Wind driven rain
88 5.5 Initial conditions
6 Numerical simulation
6.1 Background
89 6.2 Geometrical modelling
6.3 Grid and time step sensitivity studies
90 7 Documentation of input data and results
7.1 General
7.2 Problem description
7.2.1 General
7.2.2 Scope and subject of simulation
7.3 Model geometry and input parameters
7.3.1 Simulated geometry
7.3.2 Initial conditions
7.3.3 Boundary conditions
91 7.3.4 Material parameters
7.3.5 Auxiliary models
7.3.6 Output specifications
7.4 Simulation method and numerical properties
7.4.1 General
7.4.2 Simulation tool
7.4.3 Numerical simulation properties
92 7.4.4 Numerical accuracy control
7.5 Calculation report
7.5.1 General
7.5.2 Display of results
7.5.3 Interpretation of the results
94 Annex A (informative)Material parameters
A.1 General
A.2 Heat storage
A.3 Heat transport
96 A.4 Moisture storage
97 A.5 Moisture transport properties
A.5.1 General
A.5.2 Water vapour diffusion resistance
99 A.5.3 Liquid transport properties
100 A.6 Material-related model limitations
A.6.1 General
A.6.2 Influence of material boundaries on liquid moisture transport
A.6.3 Hysteresis phenomena
101 A.6.4 Swelling
A.6.5 Weathering and ageing
102 Annex B (normative)Benchmark tests
B.1 General
B.1.1 General background
B.1.2 Reference implementation
B.2 Problem description
104 B.3 Results
106 B.4 Other benchmark cases and validation suites
107 Annex C (informative)Moisture design years
108 Annex D (normative)Inside boundary conditions for residential and office buildings
109 Annex E (normative)Auxiliary models for the simplified inclusion of special effects
E.1 General
E.2 Rear ventilation and venting of building components
110 E.3 Condensation caused by air flow through building components
111 E.4 Wind driven rain penetration

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BS EN 15026:2023 - TC
$258.95