Energy-saving performance of a sunspace envelope with nano-SiO2 aerogel felt rolling curtain in rammed earth buildings dataset

This study hypothesizes that traditional sunspaces in severely cold-region rammed-earth buildings exhibit significant nocturnal heat loss and summer overheating. Integrating a nano-SiO₂ aerogel felt roller-shutter system (NSAS) into the envelope—forming a composite structure with outer inert gas-filled insulating glass and an inner retractable NSAS—enables coordinated diurnal heat gain/nocturnal insulation without compromising daylighting. This achieves optimal balance among energy conservation, carbon emission reduction, and economic feasibility.
Sheet1, the core dataset, presents orthogonal experimental results for nine solutions (Ca–Ci) across four metrics: annual energy consumption (kWh), initial investment (¥), payback period (yr), and carbon reduction (kg). It details entropy weight-based standardization, weighting, and comprehensive ranking. All solutions reduced energy use versus reference model (Co), with savings rates of 9.5–15.6%. Solution Ce (9mm aerogel + argon filling + 6mm gas layer + 100mm spacing) emerged as optimal, achieving 15.12% energy savings, 5,337.31 kg carbon reduction, and 5.45-year payback.
Contrastingly, Cc’s minimal investment (¥25,105.60) yielded the weakest energy (33,322.10 kWh) and carbon reduction (3,633.84 kg) performance, demonstrating cost-cutting’s efficiency trade-offs. High-thickness solutions (Cf, Ci) showed marginally lower energy use but >8-year payback periods due to material costs, revealing thickness-related diminishing returns.
Entropy-derived weights (energy: 45.14%, investment: 23.62%, payback: 15.78%, carbon: 15.45%) confirm energy efficiency as the paramount feasibility determinant in cold rural contexts, followed by economy. Carbon reduction’s lower weight underscores the "cost-benefit-performance" trilemma in technology adoption.
Standardization differentiated positive (carbon reduction) and negative (energy, investment, payback) indicators. Entropy analysis measured intra-indicator dispersion: payback’s high entropy (0.9607) indicated low variation (5.45–14.27 yr), yielding minimal discriminative weight. Energy consumption’s low entropy (0.8875) reflected high dispersion and rich discriminative information, justifying its dominant weighting. This objective method eliminated subjective bias.
Ce’s superiority lies not only in leading individual metrics but in its Pareto-optimal position—balancing moderate investment (¥14,085.19) with exceptional efficiency and rapid returns. This integrates innovation, environmental benefit, and rural affordability, offering a scientifically rigorous, engineerable paradigm for rammed-earth building decarbonization. Intermediate tables detail calculation parameters, while the final table presents post-verification results.