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IVIS-X 2011 Proceedings, pp. 143-148, 2012-09-16
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An investigation on long-term thermal performance of vacuum insulation panels (VIPs)
Mukhopadhyaya, Phalguni; Kumaran, M. Kumar; Sherrer, Gordon; van Reenen, David
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https://nrc-publications.canada.ca/eng/view/object/?id=0000f564-cf84-4dc9-91df-b9df6aef0ac9 https://publications-cnrc.canada.ca/fra/voir/objet/?id=0000f564-cf84-4dc9-91df-b9df6aef0ac9
An Investigation on Long-Term Thermal
Performance of Vacuum Insulation
Panels (VIPs)
16 September 2011
Phalguni Mukhopadhyaya, M. Kumar Kumaran, Gordon Sherrer & David van Reenen
Outline
• Aging of VIP – What do we know?
• What are the challenges?
• Experimental program
• Observations
Aging of VIP
– What do we know?
Depends on:
• Gas and vapor permeation properties
of barrier and sealed barrier joints
• Offgassing of core materials
• Properties of getter/desiccant
What are the challenges?
• Service life of vacuum insulation panel
(VIP) ??
• Design thermal resistance of VIP ??
• How to address aforementioned two
issues?
Blowing Agent Air Foam Lateral diffusion Surface Surface Core Normal Diffusion
Aging of Closed Cell Foam Insulation
Solid Polymer Matrix
LTTR of Closed Cell Foam Insulation
1. Elevated Temperature Conditioning 2.
Experimental Program
• Laboratory aging
• Field aging
Experimental Program
• Procured in 2003
• 20 specimens (300×300×20 mm)
• 4 specimens were exposed to 50% RH and 22°C temperature) for 60 days
• 4 specimens were exposed to 32°C and 90% RH conditions for 60 days
• Stored in controlled laboratory ambient condition and thermal performance was measured at regular intervals.
Experimental Program
Test hut @ NRC-IRC Ottawa, Canada
Test Hut
IRC/NRC Campus, Ottawa, Ontario, Canada
Experimental Program
Experimental Program
Accelerated Aging Conditions
Conditions Duration Temp (deg. C) RH (%)
1 7 days 22 95
2 7 days 70 Very low (below 5%)
Experimental Program
Nominal Dimensions of 5 VIP Products
VIP Product ID Nominal Dimensions (mm)
Length Width Thickness
482-171 300 300 20 487-61 300 300 20 487-88 300 300 25 487-115 300 300 25 499-106 560 460 12
Experimental Program
Initial Aging of Vacuum Panels
VIP Product ID Date of as
Received Test Date of Initial Test Time Period [days] Aging Rate [%/year] 482-171 2003.09.22 2010.11.02 2598 1.74% 487-61 2009.11.07 2010.10.30 358 7.11% 482-88 2010.01.28 2010.10.27 272 6.26% 487-115 2010.03.16 2010.10.28 227 4.22% 499-106 – 2010.10.29 – –
Observations
Aging (7 years) of VIPs in NRC-IRC laboratory
-20 -16 -12 -8 -4 0 0 500 1000 1500 2000 2500 3000 Cha n g e o f R -v a lu e (% ) No. of Days
Observations
Field aging (1.5 years) of VIP in Ottawa, Canada test hut
0 1 2 3 4 5
Dec-09 Mar-10 Jun-10 Aug-10 Nov-10 Feb-11 May-11
R
SI
(K
-m
Observations
Accelerated aging effects on 15 VIP specimens (5 products)
70 75 80 85 90 95 100 105 110 115 Re la ti v e T h e rma l Re si st a n ce [ % ] Cycle 482-171-A 482-171-B 482-171-C 487-61-A 487-61-B 487-61-C 487-88-A 487-88-B 487-88-C 487-115-A 487-115-B 487-115-C 499-106-A 499-106-B 499-106-C 499-106-B Envelope failure
Observations
Accelerated aging effects on 5 VIP products 70 75 80 85 90 95 100 105 110 Rela tive T h er ma l Res is ta n ce [% ] Cycle 482-171 487-61 482-88 487-115 499-106
Observations
Aging rate of VIPs
VIP Product ID Aging Rate During Cycling
%/cycle 482-171 0.72% 487-61 0.37% 482-88 0.84% 487-115 0.62% 499-106 3.51%
Conclusions - I
• Majority (13 out of 15) of VIPs investigated in this study keep their physical stability intact while subjected to extreme temperature and humidity conditions.
• Some VIPs (2 out of 15) physically failed to withstand repeated extreme temperature and humidity conditions.
Conclusions - II
• Apart from one exception, all VIP products investigated in this study showed reasonable thermal stability while exposed to extreme temperature and humidity conditions.
• Rate of thermal degradation of VIPs is as important as the initial thermal resistance of VIPs for its application in the construction industry.
Conclusions - III
• Relationship between field and laboratory aging of VIPs is the biggest challenge to predict the service life and design thermal resistance values of VIPs. • Most of the VIPs are thermally and physically
stable but some of them (minority) are not.
However, there exist no methods or
mechanisms to indentify good or bad VIP products or specimens.
Acknowledgements
• Natural Resources Canada (NRCan)
• Canada Mortgage and Housing Corporation • Anonymous VIP manufacturers
