Glazing¶
Glazing: panes and gas gaps from the outside (Buildings.HeatTransfer.Data.GlazingSystems.Generic), angular optics at the incidence angles 0, 10, ..., 90 degrees
FastSmoothBuildings.Data.Glazing, record (source)
Purpose
A glazing: its panes and the gas gaps between them, from the outside, and its angular optics, for Window.
Fields
| Field | Meaning |
|---|---|
nPan | number of panes; there are nPan − 1 gaps |
x, k, d, c |
thickness, thermal conductivity, density and specific heat capacity of each pane (the window takes its
cGla for a c of 0) |
xGas | thickness of each gap |
kGas, cGas, MGas |
thermal conductivity, specific heat capacity and molar mass of the gas of each gap |
muGas_a, muGas_b |
dynamic viscosity of the gas, μ = μa + μb T |
epsGap_a, epsGap_b |
long-wave emissivity of the pane faces on the outer and on the inner side of each gap |
tau[11] | solar transmittance of the glazing at the incidence angles 0, 10, ..., 90°, then the hemispherical value |
absPan[nPan, 11] | solar absorptance of each pane, at the same angles, then hemispherical |
absIR_a, absIR_b |
long-wave emissivity of the outer face of the outer pane and of the room face of the inner pane |
UFra | thermal transmittance of the frame |
The record carries the data of the gas, not resistances: the window computes the conductance of each gap at the
temperatures of its panes
(gapConductance). A single glazing
has nPan = 1 and empty gap arrays.
Relation to Buildings
Buildings.HeatTransfer.Data.GlazingSystems.Generic.
Use
Parameters¶
| Parameter | Type | Unit | Default | Description |
|---|---|---|---|---|
| nPan | Integer | Number of panes | ||
| x | Real | m | Thickness of the panes | |
| k | Real | W/(m.K) | Thermal conductivity of the panes | |
| d | Real | kg/m3 | Density of the panes | |
| c | Real | J/(kg.K) | Specific heat capacity of the panes | |
| xGas | Real | m | Thickness of each gas gap | |
| kGas | Real | W/(m.K) | Thermal conductivity of the gas of each gap | |
| muGas_a | Real | Pa.s | Dynamic viscosity of the gas: a_mu + b_mu*T | |
| muGas_b | Real | Pa.s/K | Dynamic viscosity of the gas: a_mu + b_mu*T | |
| cGas | Real | J/(kg.K) | Specific heat capacity of the gas | |
| MGas | Real | kg/mol | Molar mass of the gas | |
| epsGap_a | Real | Long-wave emissivity of the pane face on the outer side of each gap | ||
| epsGap_b | Real | Long-wave emissivity of the pane face on the inner side of each gap | ||
| tau | Real | Solar transmittance at the 10 incidence angles, then hemispherical | ||
| absPan | Real | Solar absorptance of each pane at the 10 incidence angles, then hemispherical | ||
| absIR_a | Real | Long-wave emissivity of the outer pane, outside face | ||
| absIR_b | Real | Long-wave emissivity of the inner pane, room face | ||
| UFra | Real | W/(m2.K) | 1.4 | Thermal transmittance of the frame |
Revisions¶
- October 2026: moved from trano's
FastModel.Data.