cool roof rating council technical committee november 17, 2008 tri presentation tile rating...
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Cool Roof Rating CouncilTechnical Committee
November 17, 2008
TRI PresentationTRI PresentationTile Rating Tile Rating
RecommendationsRecommendations
Scope of Research
Evaluate the current methods available.
Provide recommendations back to the CRRC for tile testing.
What we looked at
The 2 methods suggested by the CRRC were;
ASTM C1549 CRRC-1 utilizing the Reflectometer.
ASTM E1918 (modified) as per
Hashem outline utilizing the Pyranometer.
What the TRI did
Commissioned Ron OgawaRon Ogawa and Associates a certified CRRC lab to provide evaluation of the above test methods. Collaborated with Andre’ at ORNL.ORNL.
Provided a round robin test program in May of 2008.
Provided more in depth research with 2 independent labs
Testing Procedure Ron Ogawa performed the
following;
ASTM C1549 utilizing the Monte Carlo approach.
ASTM E1918 (Modified) utilizing the 9 tile (3 Meter) configuration per panel.
Simulated template method on tile
for C1549
Issue Considerations
The ability to provide delineation for tile profile effects.
The ability to address tiles with variegated color within the tile body.
We worked as Industry to Research We worked as Industry to Research the right approach for tilethe right approach for tile
ASTM C1549ASTM C1549ReflectometerReflectometer
ASTM E1918 ASTM E1918 PyranometerPyranometer
What the Round Robin Found Our research collaborated the
initial findings.The 1918 Pyranometer test
method as provided did not did not delineate the profilesdelineate the profiles of the tile as suggested.
Found Similar results as the Found Similar results as the Metal IndustryMetal Industry in not being able to get reliable data from E1918 method.
What we found
No ability to correlateability to correlate the C1549 results to the E1918.
Lack of consistencyLack of consistency in readings for similar tiles with the E1918.
The Method IS NOT Ready While E1918 does have positive
attributes as a test method, it is not repeatable and consistentnot repeatable and consistent for use; External affects of color and heat
come into play. Change in readings possible during
course of time frame (10:00AM – 2:00 PM)
Ability to have constant “clear” sky not likely. Small amounts of haze affect.
Reflectometer Approach
Attempts to follow the C1549 Monte Carlo testing procedure seemed to provide the most consistent readings.
Able to read flat and some curvature with consistent readings.
While not a perfect test method, seems to offeroffer the best we can the best we can identify at this timeidentify at this time.
Sample of Concrete tiles Looked at
Sample of Clay tiles Looked at
MFG Profile
Color C 1549 Avg.
# of Read
Std Dev
E 1918
Temp-late
MCA Low Tobacco* 0.302 30 0.003 0.282 0.359
MCA Med Tobacco* 0.293 30 0.005 0.284 0.348
MCA High Tobacco 0.358 30 0.004 0.257 0.357
MCA Low Irnwood* 0.181 30 0.002 0.180 0.231
MCA Med Irnwood* 0.173 30 0.004 0.169 0.224
MCA High Irnwood 0.232 30 0.005 0.183 0.238
Hanson
Low Bronze 0.227 60 0.015 0.207 0.227
Hanson
Med Bronze 0.246 48 0.009 0.159 0.240
Hanson
High Bronze 0.256 60 0.007 0.208 0.249
TRI – Cool Roof Rating Research Project
* Specimens sealed before ORNL tests
ORNLDATA
MFG Profile Color C 1549 Avg.
# of Read
Std Dev
E 1918
Temp-late
Hanson
Low Brown 0.136 60 0.008 0.117 0.128
Hanson
Med Brown 0.141 48 0.010 0.110 0.127
Hanson
High Brown 0.128 66 0.007 0.086 0.116
Eagle Low Terra-cotta
0.273 60 0.009 0.225 0.266
Eagle Med Terra-cotta
0.225 48 0.009 0.201 0.227
Eagle High Terra-cotta
0.253 60 0.007 0.201 0.247
Eagle Low Tan 0.219 60 0.011 0.188 0.223
Eagle Med Tan 0.186 48 0.007 0.128 0.183
Eagle High Tan 0.206 60 0.007 0.149 0.192
TRI – Cool Roof Rating Research Project
ORNLDATA
What we propose at this time ASTM C1549 with a TemplateASTM C1549 with a Template Create a template for a tile.
(Allows tile to be tested at same location at the 3 year mark)
Measure readings at 6 locations determined to best represent the tile and color variegation.
Perform on 9 tiles Total of 54 readings per test.
Had Ron Ogawa re-runC1549 Actual templateMethod on a flat tile
MFG Profile Color C 1549 Avg.
# of Read
Std Dev
E 1918
Temp-late
Hanson
Low Brown 0.136 60 0.008 0.117 0.128
Hanson
Med Brown 0.141 48 0.010 0.110 0.127
Hanson
High Brown 0.128 66 0.007 0.086 0.116
Eagle Low Terra-cotta
0.273 60 0.009 0.225 0.266
Eagle Med Terra-cotta
0.225 48 0.009 0.201 0.227
Eagle High Terra-cotta
0.253 60 0.007 0.201 0.247
Eagle Low Tan 0.219 60 0.011 0.188 0.223
Eagle Med Tan 0.186 48 0.007 0.128 0.183
Eagle High Tan 0.206 60 0.007 0.149 0.192
TRI – Cool Roof Rating Research Project
0.2760.276
Ron OgawaRon OgawaTemplateTemplate
Use exteriorexterior Paint and a small brushto add the information on back
Add “N”“N” on This side to
Indicate North for any retest for
Template alignment
Add MLT
Add Tile # (1 through 9)
Add SAP #
TRI Suggestion for a testing method. What we found Clay seemed to need less than
30 readings to meet the criteria. Concrete needed about 45-50 Our suggestion of 54 would
insure we have made the best possible effort to obtain a fair and proper reading.
Summary
We would recommend the C1549 test method with the Template configuration as suggested.
While not perfectnot perfect, it is the best best we can offer at this timewe can offer at this time.
We ask for the CRRC blessingCRRC blessing to utilize this method, since the time is running on the implementation date for formal ratings.