Thermodynamic Superiority of Calcium Hydroxide-Based Thermochemical Energy Storage over Ammonia-Based Systems in Concentrated Solar Power
Bibliographic record
Abstract
Thermochemical energy storage technology is a promising step in the development of renewable energy and the transition to sustainable energy systems.Thermochemical energy storage systems store thermal energy through reversible chemical reactions and can provide a stable and continuous energy source with appropriate efficiency.This study investigates and compares the performance of two promising thermochemical energy storage systems when integrated with a concentrated solar thermal power plant.Calcium hydroxide-and ammonia-based thermochemical energy storage systems, due to their suitable temperature range and energy density, are coupled with a 20 MW concentrated solar plant.Results show that, in terms of roundtrip efficiency, the calcium hydroxide-based system performs better, achieving 93.6 % thermal-to-thermal efficiency with the capability of generating 2.28 MW of electrical power, while the ammonia-based system achieves 84 % thermal-to-thermal efficiency with a capability of 2.04 MW of electrical power.From a secondlaw thermodynamics perspective, during the charging phase, the endothermic reactor in the ammonia-based system demonstrates better performance, with approximately 10 % higher exergy efficiency compared to the calcium hydroxide-based system.During the discharging phase, reactors in both systems show similar performance.For the proposed integrated configurations, a heliostat field is designed with an area of 0.055 km 2 and an efficiency of 72.44%.
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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".