Abstract
The paper presents a low wind-load linear Fresnel concentrator (LFR) for solar energy harvesting on high-rise building façades. This concentrator, characterized by a significantly reduced thickness compared to conventional designs, is termed “flattened linear Fresnel concentrator.” The concentrator imitates the “Shade Avoidance Response” of plants by attaching a rod to the mirror to form an Off-axis mirror that mitigates inter-mirror blocking in a constrained space. The paper initially outlines a comprehensive overview of the bionic theory of the concentrator. Subsequently, the paper develops an optimization model and parameter calculation procedure for the two competing objectives of flattening profile and boosting optical efficiency. Based on this, the paper discusses in detail the advantages of flattened Off-axis concentrators for building facades. Finally, this paper conducted a photothermal comparison experiment with a conventional LFR device installed vertically, and by analyzing the experimental data, it was revealed that the photothermal efficiency of the Off-axis flattened concentrator was 10.82% higher than that of the conventional LFR device, and the photothermal efficiency in one day reached 57.43%. Additionally, the paper examines the sunlight self-adaptive feature of the flattened Off-axis concentrator, demonstrating its advantages for façade integration through experimental data analysis.
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