ANSI NFRC 500-2020 pdf free download – Procedure for Determining Fenestration Product Condensation Index Ratings An American National Standard.
5.1 Significance and Use
A. This test method shall only be used when the product cannot have the Condensation Index simulated using the simulation method per Section 4 of this procedure.
B. This test method references the calibration and testing procedures as defined in the NFRC 102 and necessary additional temperature instrumentation required for the NFRC test procedure to measure the Condensation Index of fenestration systems in the vertical orientation only. Skylights are simulated at a 20º tilt and since no NFRC-accredited chamber exists to physically test products less then vertical, skylights shall not use Section 5 to determine Condensation Index.
C. Since both temperature and surface air film conditions affect results, this test method requires the use of standardized environmental conditions. The test conditions for the NFRC test procedure to measure Condensation Index shall be identical to those used in the NFRC 102.
D. This test method does not include procedures to measure the condensation potential due to either air movement through the test specimen or solar radiation effects.
E. The Condensation Index of a test specimen may be affected by its size and three-dimensional geometry. If the test specimen size is non-standard [± 12.7 mm (0.5 in)] in width and/or height from the model size referenced in Table 4-3 of ANSI/NFRC 100, then the text “non-standard size” shall be indicated in the final report as per Section 5.4.
5.2 Test Method
5.2.1 Test Specimen Testing Requirements The fenestration system shall be tested in accordance with NFRC 102.
5.2.2 Temperature Measurement The fenestration system shall be instrumented in accordance with Section 7 of NFRC 102.
A. Additional thermocouples shall be applied to the interior surface of the product as defined in Appendix B of this procedure.
B. All measurements specified in NFRC 102 shall be made.
C. The attachment of thermocouples shall be performed using a nominal 25 mm wide by 100 mm long (4 in. by 1 in.) adhesive-backed aluminum foil tape, with a surface emittance equal to that of the base surface (± 0.1). The 100 mm (4 in.) dimension parallel to the thermocouple wire.
D. For Dynamic Glazing Products that utilize a shading or diffusing system, thermocouples shall be applied to the most indoor glazing surface. They shall not be applied to any shade or blind component which may be present on the indoor side of the product.
5.3 Test Procedure Calculations This section defines the method of calculating the Condensation Index from test data.
A. Determination of the Index of the fenestration product to the formation of condensation in any form, referred to as the Condensation Index, shall be accomplished using the conditions listed in Section 5.1.B.
B. The Condensation Index using this procedure shall be determined as follows.
i. Record interior surface temperature for each individual thermocouple location.
ii. Determine Condensation Index of the frame, CI f , center-of- glazing, CI c , and of the edge-of-glazing, CI e , using Equation 5-1, Equation 5-2, and Equation 5-3:
5.3.1 Determine Condensation Index of the Frame, CI f The coldest temperature recorded from the attachment of thermocouples on the frame and sash (when applicable) shall be used to determine the CI f . The CI of the frame shall be calculated per Equation 5-1.ANSI NFRC 500 pdf download