HomeMy WebLinkAboutFile Documents.427 Rio Grande Pl.0016.2019 (75).ACBK BENDHEIM WALL SYSTEMS INC.
82 TOTOWA ROAD, WAYNE, NJ 07470 | PHONE: 800.221.7379 FAX: 973.458.0233
WWW.BENDHEIMWALL.COM
February 19, 2020
Rich Pavcek
Charles Cunniffe Architects Ph: 970-925-5590
610 East Hyman Avenue Email: richp@cunniffe.com
Aspen, Colorado 81611
RE: Aspen City Hall Thermal Performance
Dear Rich,
Several years ago we had to provide thermal analysis for the channel glass walls for the LEED
Platinum Silver Lake Branch Library (located at 2411 Glendale Blvd, Los Angeles CA -
https://bendheim.com/project/silver-lake-branch-library/. which involved integrating independent
data from two different manufacturers. The thermal data on the channel glass was derived from
NFRC test data and computer simulations for the Lamberts Linit Channel Glass and European
test data for the Wacotech TIMax GL thermal insulation.
A computer simulation performed with NFRC approved software by ETC Laboratories predicted
SHGC and U values for eight combinations of Lamberts Channel glass. The combinations
included a clear, uncoated channel glass as a base line and combinations of Azur (SHGC)
and/or Low-e (U-Value) coated channel glass. The computer simulation predicted a U-Value of
.52 for the clear glass combination (this tested at a value of .49). The computer simulation
predicted a U-Value of .42 for the Low-e coated glass combination (this tested at a value of .41).
We concluded that the addition of the Low-e coating reduced the U-Value by 0.08 under test
and 0.10 under simulation.
Wacotech’s literature shows that the U-Value (Ug-value W/m2K) of clear, uncoated channel
glass with TIMax GL insulation inserted between the channels has an average U-value of .246.
Our conclusion was that the addition of TIMax GL insulation should lower the U-Value by 0.24,
from 0.49 to 0.25.
There is no known test data combining the insulation with the Low-e coated glass and the
computer simulation did not allow the addition of the insulation. IF the effect of the coatings and
the insulation were directly additive, the total configuration theoretically would produce the U-
Value to approximately 0.17 under test and 0.15 under simulation. The conservative position
was taken that a true cumulative effect may not occur and used a 75% cumulative effect
resulting in the more conservative 0.19 under test (0.17 under simulation).
Regards,
Michael Tryon, General Manager
02/27/2020
ETC-05-926-16104.0
Page 2 of 7
Unit
in.
in.
in.
-
in.
in.
in.
-
-
%
in.
in.
in.
-
-
-
Unit
Btu/hr⋅ft2⋅°F
Btu/hr⋅ft2⋅°F
Btu/hr⋅ft2⋅°F
-
** CTS method is used in accordance with ASTM C1363 - 97 requirements.
Series 504/504 Glazing System
with LowE on Surface 3
NFRC Operating Type
Fixed, O
0.008
Standardized U-factor U ST
Item
CTS Method
2.250
Measured U-factor US
Measured US Uncertainty ∆US
0.42
0.41
Standardization method **
Gap 2 thickness
Spacer type
Overall IG nominal thickness
Gap 1 thickness
Low-e emssivity *
Low-e surface
Frame material
Summary of Results
0.383
* As stated by the manufacturer.
ETC-05-926-16104-2
Test Start Date: 03/09/05
Report Number: ETC-05-926-16104.0
Job Number:
44 x 48
Item
03/10/09
ASTM C1363 - 97 THERMAL TEST REPORT
Generic Size (in.)
Expiration Date:
Product Tested
Rendered To
Bendheim Wall Systems
62 Willet Street
Passaic, NJ 07055
Glass 3 thickness
Value
2
2.750
Overall width 43.500
Overall thickness 2.750
Overall height 48.000
03/10/05
Report Date: 03/22/05
AIR
-
Product Description
Number of glazing layers
-
-
IG gap fill *
Percent gap fill *
Glass 1 thickness
Glass 2 thickness
Test Finish Date:
Value
-
0.250
0.250
100.0
3
This document does not alleviate our concerns that the channel glass does not comply
with City of Aspen fenestration policy.
Option 5 of the policy for demonstrating compliance reads:
“U-ratings by an NFRC–accredited lab in accordance with NFRC-100. To document the
chain of custody, verification labels affixed to the units by an accredited independent
inspection agency or a certificate, affidavit or other evidence from the manufacturer
confirming compliance with the above simulation or testing.”
ETC Laboratories performed the simulations; they are not listed anywhere in NFRC’s
database so we are unable to verify that they are NFRC accredited:
http://nfrc.org/testing-verification-resources/
The letter states that the NFRC software will not allow the specific combination of
materials to be simulated, so they have separately simulated two separate components
of the system and then arbitrarily added them together (offsetting the a perfect
cumulative effect by reducing to 75%) to get an overall U-factor. This does not appear to
be in accordance with NFRC-100.
ETC-05-926-16104.0
Page 3 of 7
Symbol
QTOTAL 653.50 191.53 W
QSP 172.96 50.69 W
LSP 0.33 0.10 m
CSP 0.05 0.31
W/m2⋅K
QEX 55.80 16.35 W
QS 424.74 124.49 W
AS 14.50 1.35
m2
AMR 64.00 5.95
m2
AB1 64.00 5.95
m2
ASP 49.50 4.60
m2
th 70.05 21.14 °C
tc 0.26 -17.63 °C
tg 69.84 21.02 °C
tb1 69.95 21.08 °C
tb2 0.16 -17.69 °C
tSP1 64.49 18.05 °C
tSP2 0.60 -17.44 °C
RHMR 0.8 0.8 %
Vh 0.0 0.0 m/s
Vc 22.4 10.0 m/s
- 0.00 0.00 m3/(h-m2)
US 0.42 2.38
W/m2⋅K
US[CTS]0.41 2.32
W/m2⋅K
Measured Test Data
Heat Flows
Item
ft2
ft2
ft2
ft2
3. Metering room baffle area
5. Average cold side baffle temperature °F
4. Average warm side baffle temperature
°F
°F
6. Average warm side surround panel temperature
8. Average metering room relative humidity
7. Average cold side surround panel temperature
%
mph
Btu/hr⋅ft2⋅°F2. CTS method standardized U-factor
2. Average cold side air temperature
°F3. Average guard room air temperature
SI Unit
2. Metering room opening area
Surround panel conductance Btu/hr⋅ft2⋅°F
Btu/hr
1. Total measured input into the metering room
4. Net specimen heat flow
Btu/hr
Btu/hr
ft
3. Metering room extraneous heat flow
IP Unit
ASTM C1363 - 97 Thermal Transmittance (U-Factor) Measurement Data
Btu/hr
cfm/ft2
Surround panel thickness
°F
1. Specimen projected area
4. Surround panel exposed interior area
Areas
°F
Test Conditions
1. Average metering room air temperature
2. Surround panel heat flow
°F
mph
10. Cold side air velocity
9. Warm side air velocity
Btu/hr⋅ft2⋅°F
11. Maximum specimen air leakage before test
1. Measured specimen U-factor
U-Factor Results
ETC-05-926-16104.0
Page 4 of 7
Symbol
e1 0.84 0.84
eb1 0.93 0.93
t1 48.50 9.16 °C
t2 5.89 -14.50 °C
tb1 69.95 21.08 °C
hI 1.36 7.72
W/m2⋅K
hII,CTS 5.20 29.53
W/m2⋅K
CS 0.69 3.90
W/m2⋅K
K 0.28 1.85 W/m2⋅K1.25
QR1 235.30 68.96 W
QC1 189.44 55.52 W
qR1 16.23 51.20
W/m2
qC1 13.06 41.22
W/m2
hSTI 1.26 7.16
W/m2⋅K
hSTII 5.10 28.96
W/m2⋅K
UST[CTS]0.41 2.32
W/m2⋅K
1. 12:51 AM hrs. on .
2.
hrs., to hrs.; from hrs. to
hrs.
3. 6:51 AM hrs. to hrs.
4.
Upon arrival - in.
- in.
Before test -0.005 in.
- in.
After test -0.006 in.
- in.
No condensation was observed after test.
Location of the ETC guarded hot box Thermal testing area at ETC Laboratories, Inc.
Note 1: The specimen was sealed on the interior with tape to minimize air leakage during test.
The steady state was determined in accordance with ASTM C1363 - 97.
1. Emmitance of glass
Calculated Test Data
ASTM C1363 - 97 Thermal Transmittance (U-Factor) Standardization Calculation
Item SI Unit
Btu/hr⋅ft2⋅°F1.25
Btu/hr⋅ft2⋅°F
Btu/hr
IP Unit
14. Standardized warm side surface conductance
8:51 AM
8:51 AM
6:51 AM6:51 AM
15. Standardized cold side srface conductance
03/09/05
The test parameters were considered stable for two consecutive two-hour test periods from
The thermal test results were derived from
ASTM C1363 - 97 Thermal Transmittance (U-Factor) Test Duration
2. Metering room baffle emmitance
The ETC guarded hot box was started at
4:56 AM
16. Standardized thermal transmittance (U-factor)
5. Metering room baffle surface temperature
6. Measured warm side surface conductance
7. Calibrated CTS cold side surface conductane
Btu/hr⋅ft2
°F
°F
Equivalent "CTS" Method
Btu/hr⋅ft2⋅°F
4. Equivalent cold side surface temperature
3. Equivalent warm side surface temperature
8. Specimen surface conductance
9. CTS calibrated convection constant
Btu/hr⋅ft2
Btu/hr⋅ft2⋅°F
Btu/hr⋅ft2⋅°F
11. Specimen convective heat flow
°F
Btu/hr⋅ft2⋅°F
10. Specimen radiative heat flow
Btu/hr
12. Specimen radiative heat flux
Btu/hr⋅ft2⋅°F
Additional Results and Records
Item Result
Upper lite
13. Specimen convective heat flux
Lower lite
Upper lite
Lower lite
Upper lite
I.G. glazing deflection measurement
Condensation observation
Lower lite
Calibration date 07/09/04
Note 2: The airflow is perpendicular to the exterior side of the specimen during test.
ETC-05-926-16104.0
Page 5 of 7
Check
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
6. Material N/A
Manufacturer Fabrication Information
Comments
NOTE: The following information has been obtained from manufacturer of the test specimen. Checks and comments have
been made by ETC Laboratories based on the specimen, bill of materials, drawings and any documentation
provided by the manufacturer.
Manufacture
1. Number of glazing layers
2. Overall IG nominal thickness
Glazing:
Item
6. Glass thickness in inch (Layer 1, Layer 2, Layer3)
ARG, 90%
0.250, 0.250
3. Cavity thickness in inch (Gap 1, Gap 2)
4. Spacer type
5. IG gap fill (Argon, Krypton, Air and percent)
2
2.750
2.250
7. Emissivity of low-e surface
8. Low-e surface(s) number(s)
0.383
3
10. Other information: Both sides glazed with silicone
Sash (1):
7. Other information:
3. Corner construction (Mitered, Butt, Coped, etc.)
4. Corner fastening (Screws, Welded, Nailed, etc.)
N/A
N/A
2. Height (in.)
N/A
N/A
Frame:
1. Width (in.)
-
3. Operation type N/A
N/A1. Right vent width (in.)
2. Right vent height (in.) N/A
4. Corner construction (Mitered, Butt, Coped, etc.) N/A
5. Corner fastening (Screws, Welded, Nailed, etc.) N/A
6. Corner sealant (Silicone, Foam, Gasket, etc.)
2. Left vent height (in.) N/A
3. Operation type N/A
5. Corner fastening (Screws, Welded, Nailed, etc.)
7. Other information:
N/A
5. Corner sealant (Silicone, Foam, Gasket, etc.) N/A
6. Corner sealant (Silicone, Foam, Gasket, etc.) N/A
N/A
4. Corner construction (Mitered, Butt, Coped, etc.) N/A
1. Left vent width (in.) N/A
7. Other information:
9. IG edge sealant material (PIB, Urethane, etc.) PIB
Sash (2):
ETC-05-926-16104.0
Page 6 of 7
Check
X
X
X
X
X
X
X
X
X
X
CommentsItem Manufacture
Fixed Lite:
1. Daylight opening width (in.) 43.500
Drainage (Weep Size, Location, Coves, etc.):
None
2. Daylight opening height (in.) 48.000
3. Other information:
Reinforcement Location and Material:
None
Hardware Type and Location:
None
Weatherstripping Type, Size and Location:
None
Screen Size, Frame Material, Mesh Material, and Corner Construction:
Manufacturer Fabrication Information (Continued)
Anchorage Method, Number, Location and Type:
Review of Bill of Materials by ETC Laboratories:
1. Anchored in mask with duct tape
None
Review of Assembly and Detail Drawings by ETC Laboratories:BJM
This report, in its original form contains product drawings and a Bill of Materials.
ETC-05-926-16104.0
Page 7 of 7
in order to fulfill its contractual obligations for testing, engineering, and test equipment fabrication services.
FOR ETC LABORATORIES
Ben Meunier, Thermal Test Engineer
Thermal Testing Department
Sam Yuan, Director, Testing Services
Person in Responsible Charge
Conditions, Terms, and General Notes Regarding The Test
or solar radiation effects. As a consequence, the thermal transmittance results obtained do not reflect performances
which may be expected from field installations due to not accounting for solar radiation, air leakage effects, and
This test method does not include procedures to determine heat flow due to either air movement through the specimen
thermal bridge effects that may occur due to the specific design and construction of the fenestration system opening.
The latter can only be determined by in-situ measurements. Therefore, it should be recognized that the thermal
transmittance results obtained from this test method are for ideal laboratory conditions and should only be used for
fenestration product comparisons and as input for thermal performance analysis which also includes solar, air leakage,
of the work referred to herein. ETC Laboratories reserves the right to subcontract any and all work for its clients
or mark shall not be used in any circumstance to the public or in any advertising.
Limitation of Liability: Due diligence was used in rendering the professional opinion. By acceptance of this
report, the client agrees to hold harmless and indemnify ETC Laboratories, Inc. from and against all liability,
claims, and demands of any kind whatsoever, which arise out of or in any manner connected with the performance
ETC Laboratories letters, reports, its name or insignia or mark are for the exclusive use of the client so named
herein and any other use is strictly prohibited. The report, letters and the name of ETC Laboratories, its seal
the tested product and engineering information supplied by the client "Are Equivalent". The report will be retained for
four years from the date of initial test.
ETC Laboratories makes no opinions or endorsements regarding this product and its performance. This report
may not be reproduced or quoted in partial form without the expressed written approval of ETC Laboratories.
The product tested has been compared to the detailed drawings, bill of materials and fabrication information supplied
by the client so named herein. Our analysis, which includes dimensional and component description comparisons, indicate
and thermal bridge effects.
This report relates only to the fenestration products tested.
The rating values included in this report are for submittal to an NFRC-licensed IA and not meant to be used directly for
labeling purposes. Only those values identified on a valid Certification Authorization Report (CAR) by an NFRC accredited
Inspection Agency (IA) are to be used for labeling purposes.
This test was conducted in full accordance with the procedures established in"ASTM C1363 - 97:
Test Procedure for Measuring the Steady-State Thermal Transmittance of Fenestration Systems".
Data Sheet TIMax® GL Glass Fiber Insulation
TIMax GL is a translucent glass fiber insulation
material, which enhances the heat insulation (U-
value) of U-profiled glass facade systems. It scatters
incoming light nicely and fills the space between the
double glazing unit completely.
TIMax GL additionally offers sun protection,
because it reduces solar heat penetrating the
window in the summer.
TIMax GL is both, translucent and light scattering.
Due to the effect of scattering light, even deep
rooms can be illuminated evenly, without blending
and shading.
TIMax GL is UV-stable, temperature resistant up to
100°C and insensitive against humidity. It is easy to
install.
Standard dimensions: See delivery list
Installation: See installation manual
Tender text for download under:
www.wacotech.de
-> Downloads
-> TWD für Profilglas
-> Ausschreibungstext TIMax GL
Properties of TIMax GL glass fiber insulation
Material Glass fiber / Binder
Thickness Approx. 70mm, compressible
Density Approx. 4,5kg/m3
Flammability Self extinguishing
Temperature resistance 100°C
Technical data TIMax GL
Light transmission and heat insulation for TIMax GL insulation inlet for double glazed U-profiled glass
Glass Type Glass space light transm.
t direct
g-value
direct
Ug-value
[W/m2K]
noise red.
Rw [dB]
LINIT, 41mm Glas appr.
37mm 0,40 0,44 1,5 -
PROFILIT, 41mm Glas appr.
37mm 0,38 0,41 1,5 -
LINIT, 60mm Glas, xx/60/7 appr.
56mm 0,39* 0,43* 1,4* 44* **
PROFILIT, 60mm Glas, xx/60/7 appr.
56mm 0,36* 0,40* 1,4* 44* **
* measured values by Fraunhofer Institut ISE, IFT Rosenheim
** using TIMax insulation improves the noise insulation about 1dB
U-Value
BTU
0.246
04 I 0:4BAM ETC LABORATOR I ES
Laboratories
Up loYour Standur&r, Aryd lulore
No.26bg P,2
Corpnrrtc Offiq.. / Lrhurutorirri
197 Buetl Roud
Rochestcr. NY 1424-3 L02
Tol: (585) 128"76{t8
Faxr (585) 3l]8'7177
httpl.//www, ctclabs.cour
lnr.ulrting Glrnr Divinion
Jim Spcur Torting Laborurury
2.0633 l;rl*lald Blvd.
Wirklitfq OH 44ry)2-221)3
Report Number,
Job Number
ETC-0+926-14664.0 Simulation Date:
Report Date:
TG'lr (440) 944-36(rj
x: (44t1) 9.1+3d?l
05/0612004
-d5m'686G-ETC-04-926-146Ar.3
THEHULII, SJT{-I&ATION LEST RPT.gST
Rendered To
:,
Bendheint WallS]sbms
62 WlletS'heet
Passaic- NJ 07055
Product.$iq+l+$Pd
1" 5U Roughcast Clear Glass (Clear)
'2,504'RoughcaEt Low E on QlearGlass (Lors$
3- 504 Roughcast Azur Green Gla$s (Azud , t
$ummarv of Results
.-:,t .,! |
T,$+t..Overalt Glass;.l . ". .Sgyjty.,:::i,::GlaBE 2 Cehter Cenler Gr
No.fthickness FilI /Thickneiri
..LoWE..,,, Centgr
/ gurface SHGG sc. w
0.t
3
4
s
7
o
72.00
72.04
72.00
72"00
72.AA
72_A0
72.O0
LowE/7 00
cleert 7.00
Azuri 7.00
Clear/ 7.00
Azur 17.A0
LowE i 7.00
Azur/ 7.00
'LoryE7
00
Clear/7.00
Azur/ 7.00
AzxlT:0Q
Aeur 17.04
Lotrt'E / 7.00
'0;09,
0.61
0.66
0.56
0.60
0.50
0.53
0.59
Air
Air
Ari
Air
Air
Air
Air
Clear/?.oo 0.38it /2
0.383 i 3
0.383 / 2
0.383 r3
, qo_.
2.30
2.97
2.96
2.95
2.3S
2_38
.0.70
0.75
0.€5
0.69
0.5/
0_62
0.$1
0.64
0.64
0.53
0.53
0.40
0.48
0.48
0.238
0.283
0.359
0.358
0.s56
0.238
0.238
.ncsmCCons
1 . ln tre evaluation of various properties otgiass p#ucts, computer simulations were conducbd.
2. All values of glass thickness, cavity fill, ovemll product deptr and Lqu/.E surhcewere supplied by Bendheirn.
3. Solar spectral properties of all glass produc& evaluated'were supplibd b! Optical Dah Associates, LLC (ODA)
'4..,Qlass emmihnce vafues. uoed.in.the simulation$:vrete also provjded by OPA.
E" SC: qnaOing Coefficidnt,'lrf: Vis,lble TransmithnCe, l-ow pjL, oul Emimnce.
,6- The drawing on the right hand sidb shpws glazing diagram,
7. Alt simulations were conduclted on requirements from Eendheim.
8" No re'sulis €n be us6d for certlfictfon purposes-
23 4
Glass Glass
Exbrior
Side
lnterior
Side
21Director of Thermat Teetjng and $imulations
U-Value
BTU
0.53
0.42
0.42
0.52
0.52
0.52
0.42
0.42