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Vapor diffusion and condensation risk on a wall surface and inside it (We…

- - - - where TEMPERATURE COEFFICIENT for thermal bridges are given in catalogs
- - - - PERMEABILITY
      - WATER VAPOR DIFFUSION RESISTANCE
      - PERMEANCE
    - - where TEMPERATURE COEFFICIENT for thermal bridges are given in catalogs
- - - - The boundary of the building consists of all the building elements separating the conditioned space or spaces under consideration from the external environment (air, ground or water) or from adjacent buildings or unconditioned spaces
        
        If necessary the building shall be divided into calculation zones
      - A ZONE is part of a conditioned space with a given set point temperature throughout which the internal temperature is assumed to have
        negligible spatial variations and which is
        controlled by a single system
        
        Depending on the conditions:
        
        the whole building may be modelled as a single zone,
        
        the building may be partitioned into several zones, accounting for
        thermal coupling between the zones (multi-zone coupled calculation),
        
        the building may be partitioned into several zones, taking no account of
        thermal coupling between the zones (multi-zone uncoupled calculation)
        
        SINGLE ZONE
        
        Set-point temperatures for heating of the spaces differ not more than 4 K.
        
        The spaces are all not mechanically cooled or all mechanically cooled and setpoint temperatures for cooling of the spaces differ not more than 4 K.
        
        The spaces are serviced by the same heating system (if any) and the same cooling system (if any)
        
        If there is a ventilation system, and at least 80 % of the floor areas of the spaces are serviced by the same ventilation system (the other spaces are then considered to be serviced by the main ventilation system).
        
        The amount of ventilation in the spaces, expressed in cubic metres per square metre floor area per unit of time differs by not more than a factor of 4 within 80% of the floor area or the doors between the spaces are likely to be frequently open.
    - - COOLING ENERGY BALANCE
        
        FREE HEAT GAINS UTILIZATION FACTOR
        It's a function of BUILDING TIME COSTANT \tau and GAINS-TO-LOSSES RATIO
        
        BUILDING TIME CONSTANT
        
        Ht and Hv are the overall heat transfer coefficient respectively by transmission and ventilation, adjusted for the indoor-outdoor temperature difference, in W/K
        Cm is the internal heat capacity of the building or building zone, in J/K
         is the internal heat capacity per area of the building element j, with maximum effective thickness = 0.1 m #
        
        LENGTH OF COOLING SEASON
        
        BUILDING TIME CONSTANT
        
        Ht and Hv are the overall heat transfer coefficient respectively by transmission and ventilation, adjusted for the indoor-outdoor temperature difference, in W/K
        Cm is the internal heat capacity of the building or building zone, in J/K
         is the internal heat capacity per area of the building element j, with maximum effective thickness = 0.1 m
      - HEATING ENERGY BALANCE
        
        TRANSMISSION
        
        Adjustment factor b
        (ISO 13789)
        
        a=adjacent conditioned space
        
        Cold Bridges
        (simplified procedure)
        
        Presence of shutter for windows
        
        VENTILATION
        
        Adjustment factor b
        (ISO 13789)
        
        INTERNAL HEAT GAINS
        
        Semplified Calculation
        (UNI/TS 11300-1)
        
        SOLAR HEAT GAINS
        
        Heat flow by solar gains per building element
        
        Effective solar collecting area of GLAZED elements
        
        Movable SHADING provisions
        
        TOTAL SOLAR energy TRANSMITTANCE for GLAZING
        
        REDUCTION of g due to PERMANENT CURTAINS
        
        Effective solar collecting area of OPAQUE elements
        
        Thermal RADIATION to the SKY
        
        FREE HEAT GAINS UTILIZATION FACTOR
        It's a function of BUILDING TIME COSTANT \tau and GAINS-TO-LOSSES RATIO
        
        Deviation from REFERENCE T
        
        BUILDING TIME CONSTANT
        
        Ht and Hv are the overall heat transfer coefficient respectively by transmission and ventilation, adjusted for the indoor-outdoor temperature difference, in W/K
        Cm is the internal heat capacity of the building or building zone, in J/K
         is the internal heat capacity per area of the building element j, with maximum effective thickness = 0.1 m
        
        LENGTH OF HEATING SEASON
        
        BUILDING TIME CONSTANT
        
        Ht and Hv are the overall heat transfer coefficient respectively by transmission and ventilation, adjusted for the indoor-outdoor temperature difference, in W/K
        Cm is the internal heat capacity of the building or building zone, in J/K
         is the internal heat capacity per area of the building element j, with maximum effective thickness = 0.1 m
- - - - 1D FLOW
      - 2D or 3D FLOW
        
        where TEMPERATURE COEFFICIENT for thermal bridges are given in catalogs
    - - by using the Mollier Diagram
      - by comparing the vapour pressure with the saturation pressure, function of T
  - - - FICK'S LAW (1D FLOW)
        
        similar to the Fourier's Law
        
        PERMEABILITY
        
        WATER VAPOR DIFFUSION RESISTANCE
        
        PERMEANCE
      - 2D or 3D FLOW
        
        where TEMPERATURE COEFFICIENT for thermal bridges are given in catalogs
    - - by using the Mollier Diagram
      - by comparing the vapor pressure with the saturation pressure, function of T