NFRC LONG TERM ENERGY PERFORMANCE RESEARCH PROJECT

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NFRC LONG TERMENERGY PERFORMANCE RESEARCH
PROJECT

• Final Report
• Issued By
• ETC Laboratories, Inc.
• Sam Yuan
• David Kehrli
• September 19, 2003

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INTRODUCTION
LONG TERM ENERGY PERFORMANCE

• Review of Tested Specimens
• Project Scope Assumptions
• Test Results - Pre / Post Cycling
• U-factors
• Glass deflection
• Air leakage
• CRF
• Analysis
• Recommendations

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Window / Door Specimens
LONG TERM ENERGY PERFORMANCE

• 27 specimens received tested (3 were duplicate
  samples)
• 26 samples in-tact, 1st test unit (tested at
  project initiation) was cut-up
• Samples are in storage at ETC waiting for further
  direction from SC (component/assembly analysis,
  cut-ups, etc)
• Data Analyses and Report Writing
• Test results were analyzed using ANOVA

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PROJECT SCOPE ASSUMPTIONS
LONG TERM ENERGY PERFORMANCE

• NFRC LTEP Subcommittee Agreed That
• 45 Temperature cycles (-20F to 125F with black
  plate temperature of 160F)
• 300 Wind pressure cycles (20 DP)
• 2500 Operational cycles
• would/may simulate actual installed exposure
  conditions on fenestration products.
• no time equivalent of field exposure is presumed
  or stated with these test parameters
• NFRC 100 used for U-factor and AAMA 1503 for CRF
• ASTM E283 for air leakage

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RESULTS AND ANALYSES
LONG TERM ENERGY PERFORMANCE

• U-Factor Results
• There are several outliers (2s limits)
• Average U-factor change is 8.7
• 10 U-factor changes are more than 10
• 10 U-factor changes are between 5 to 10
• Factor Effect Analysis of U-Factor Changes
• ANOVA (Analysis of Variance) was used with two
  factors with equal sample size

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LONG TERM ENERGY PERFORMANCE
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RESULTS AND ANALYSES
LONG TERM ENERGY PERFORMANCE
LONG TERM ENERGY PERFORMANCE

• Deflection Results
• There are two outliers (2s limits)
• Average deflection change is 54.5
• 5 Deflection changes are more than 100
• 8 Deflection changes are between 50 - 100
• Factor Effect Analysis of U-Factor Changes
• Frame material has effects on glass deflection
  changes for both window and door specimens

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RESULTS AND ANALYSES
LONG TERM ENERGY PERFORMANCE
LONG TERM ENERGY PERFORMANCE
LONG TERM ENERGY PERFORMANCE

• Air Leakage Results
• There are several outliers (2s limits)
• Average air leakage change is 136.6
• 9 Air leakage changes are more than 100
• 7 Air leakage changes are between 50 - 100
• 4 Specimens increased to failing AAMA/WMDA
  101/IS2 requirements
• Factor Effect Analysis of U-Factor Changes
• Both frame material and operator type have
  significant affects on air leakage change for
  doors but neither have affects on air leakage
  change for windows

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RESULTS AND ANALYSES
LONG TERM ENERGY PERFORMANCE
LONG TERM ENERGY PERFORMANCE
LONG TERM ENERGY PERFORMANCE
LONG TERM ENERGY PERFORMANCE

• CRF Results
• There are several outliers (2s limits)
• Average CRF change is 5
• 2 CRF changes are more than 10
• 8 CRF changes are between 5 - 10
• Factor Effect Analysis of U-Factor Changes
• Both frame materials and operator type have no
  significant effects on CRF change

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RECOMMENDATIONS
LONG TERM ENERGY PERFORMANCE
LONG TERM ENERGY PERFORMANCE
LONG TERM ENERGY PERFORMANCE
LONG TERM ENERGY PERFORMANCE
LONG TERM ENERGY PERFORMANCE

• Detailed research on a single factor effects on
  property changes should be conducted
• Additional research on specimens with different
  components such as IG designs, weather-stripping,
  method of glazing, etc.
• NFRC test protocol should be studied for
  correlation to actual changes of installed
  products and exposure time i.e., number and
  magnitude of cycles equals how many years of
  in-service exposure