Experimental and Numerical Investigation of Thermal Storage Medium for Ground Source Heat Pump Applications
Bibliographic record
Abstract
<p>The thesis begins with a literature review of the current status of ground source heat pump (GSHP) systems. The limitations of these systems are discussed and the potential to couple phase change material (PCM) with a GSHP system is explored and presented. The research focuses on a paraffin- based PCM for the experimental studies in this thesis due to its low-cost/non-toxic properties.</p> <p>The development of a bentonite-sand tank experiment is presented in Chapter 2. A steel casing, which emulates a single borehole positioned at the centre of a 1 m diameter tank was used to study the energy transfer rate from the borehole to the surrounding material in the tank. Using the obtained experimental results, the numerical model for this experiment was developed and validated in Chapter 4. A series of studies were performed in order to determine the temperature distribution profile of the tank for different bentonite thermal conductivity values. Due to a lack of drilling space, a bentonite-based thermal storage medium (TSM) is not a viable solution for many building owners and developers in urban settings. As such, the findings from this study were used towards the design of the concrete tank for testing in Chapter 3 in regards to the placement of the boreholes and PCM tubes.</p> <p>The development of a concrete tank experiment is presented in Chapter 3. Four boreholes and eight PCM tubes were installed in order to characterize the heat transfer performance and the potential for energy storage with PCM for concrete-based applications. Due to the high thermal conductivity value of concrete, the temperature distribution at various depths and angular positions of the tank were relatively uniform.</p> <p>In Chapter 5 a numerical model of the concrete tank experiment was developed and validated. The performance of a concrete-based heat exchanger tank with and without PCM were investigated. The findings from these results were essential to inform the design and installation of a full-scale system that is now being used for heating and cooling a residential dwelling.</p>
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
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 teacher head, 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".