Standard Practice for Determining the Effects of Temperature Cycling on Fenestration Products

Importancia y uso:

5.1 Fenestration products, when exposed to differential temperatures (constant higher or lower temperatures on the exterior and room temperature on the interior), or temperature cycling (relatively constant room temperature on the interior and repeated cycling of higher and lower temperatures on the exterior), will have stresses induced on components that may cause failure or changes in overall system performance. Some of these changes may be temporary, with their effects on system performance lasting only during the cyclical temperature exposure. Other changes may be more permanent because of the failure of critical components or irreversible changes in those critical components that control overall system performance.

5.2 In this practice, a procedure is provided for evaluating the effects of exposure to temperature cycling at standardized conditions on fenestration products. It is useful for product evaluation and development. Interrelationships between window components can be studied under laboratory conditions simulating in-service temperature extremes.

5.3 Laboratory approximation of in-service temperature cycling and temperature extremes is a useful tool for the fenestration designer. These conditions help in evaluating designs and components for absolute and relative interactions on overall performance when these products are installed and functioning in residential and commercial buildings.

5.4 This practice is limited to temperature exposure and temperature cycling only. Temperature is only one of many environmental factors that affect field performance of fenestration products. Products made with different materials or construction methods may show specific sensitivity to different environmental factors, such as humidity, ultraviolet radiation, or airborne chemicals.

5.5 Because of the complexity and cost of a single apparatus capable of measuring window performance, providing temperature cycling, and providing infrared radiation exposure, more than one test apparatus may be required to complete this practice. If multiple test apparatus are used, care shall be taken when moving the specimen from one apparatus to another to protect them from damage by racking, twisting, dropping, or other causes of distortion.

5.6 In this practice, specimens are subjected to one of a variety of possible variations of ambient air temperature or surface temperature cycling conditions by using either convective hot air or exposure to infrared radiation. Therefore, the results are valid only for the test method and conditions used.

5.7 At present, no correlation data exists that relates this practice to field performance.

Subcomité:

E06.51

Referida por:

E2813-24

Volúmen:

04.12

Número ICS:

91.060.50 (Doors and windows)

Palabras clave:

accelerated aging; air leakage; convective hot air; differential air temperatures; durability; fenestration; infrared radiation; temperature cycling; window performance;