The curtain wall is also designed to be resistant to surface condensation. To be resistant
however, the aluminum curtain wall must incorporate various features such as quality thermal
breaks for the aluminum frames, double or triple glazing for the vision area and an insulated
spandrel pan area. Connections and fasteners may also include thermal breaks or thermal
separators. The condensation resistance of the aluminum curtain wall in winter is governed by
the indoor conditions of temperature and relative humidity and the outdoor temperature. In
summer, the condensation resistance of the aluminum curtain wall is governed by the outdoor
temperature, the outdoor relative humidity and the indoor air conditioned temperature.
Condensation occurs on the glass or aluminum surfaces when the humidity of the surrounding
air comes in contact with a cold surface to change from a vapour to liquid. The temperature at
which this change occurs is known as the dewpoint temperature of the surrounding air. To
determine the dewpoint temperature of the surrounding air, two conditions must be known or
selected (conditions are selected when designing a new project), the (dry bulb or ordinary)
temperature and the relative humidity. Using a psychrometric chart (see Fig. 10) the dewpoint
(or condensation) temperature of any mass of air at a given temperature and relative humidity
may be determined (see ASHRAE Fundamentals).
The curtain wall is also designed to be resistant to surface condensation. To be resistant
however, the aluminum curtain wall must incorporate various features such as quality thermal
breaks for the aluminum frames, double or triple glazing for the vision area and an insulated
spandrel pan area. Connections and fasteners may also include thermal breaks or thermal
separators. The condensation resistance of the aluminum curtain wall in winter is governed by
the indoor conditions of temperature and relative humidity and the outdoor temperature. In
summer, the condensation resistance of the aluminum curtain wall is governed by the outdoor
temperature, the outdoor relative humidity and the indoor air conditioned temperature.
Condensation occurs on the glass or aluminum surfaces when the humidity of the surrounding
air comes in contact with a cold surface to change from a vapour to liquid. The temperature at
which this change occurs is known as the dewpoint temperature of the surrounding air. To
determine the dewpoint temperature of the surrounding air, two conditions must be known or
selected (conditions are selected when designing a new project), the (dry bulb or ordinary)
temperature and the relative humidity. Using a psychrometric chart (see Fig. 10) the dewpoint
(or condensation) temperature of any mass of air at a given temperature and relative humidity
may be determined (see ASHRAE Fundamentals).
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