Design and Construction of a Guarded Hot Plate Apparatus to Evaluate the Thermal Resistance of Vacuum Insulated Panels using a New Accelerated Ageing Procedure
Bibliographic record
Abstract
When bringing a structure up to current building standards, or voluntarily constructing to higher insulating levels, adjustments to the thickness of walls may be required.To meet the energy and space saving requirements of today's building market, builders are looking for new materials and practices to insulate their walls.Vacuum insulation panels (VIP) have shown potential to meet or exceed today's high insulating levels while keeping the thickness of the building envelope down.One of the problems facing owners and builders wanting to use VIPs, is their unknown service life.As such, recent research has focused on developing methods to accelerate ageing in order to determine the service life of VIPs.However, a disconnect exists between results obtained from accelerated ageing and real time degradation.The process outlined within this thesis presents a method to link the results obtained from accelerated ageing with real degradation.In addition, the thesis presents the design, construction and commissioning of a new guarded-hot-plate testing apparatus to evaluate the thermal resistance of the VIPs as they are artificially aged.The latter focuses on the moisture accumulation and thermal resistance of climate aged panels.The rate of moisture accumulation in the VIPs located in the climate chambers can be determined when comparing to climate profiles of VIP walls that were found in-situ.To study the effect of moisture on the thermal performance of VIPs, VIPs from two manufacturers were held in a climate chamber at 30℃ and 90% RH for 30 days.The panels from the first manufacturer experienced a 0.2% mass increase from an initial mass of 840 g due to moisture and experienced a decrease of 5% in thermal resistance.The panels from the second manufacturer experienced a decrease of 6.5% in thermal resistance from a 0.05% gain in mass from an initial 246 g, proving that iii that even a small amount of moisture can negatively affect the thermal resistance of the panel.The accelerated ageing method described in this thesis builds on these findings and aims to determine the service life of panels in different climate zones.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.002 | 0.002 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.002 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.002 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".