Coffee-based colloids for direct solar absorption

被引：31

作者：

Alberghini, Matteo ^{[1
]}

Morciano, Matteo ^{[1
]}

Bergarnasco, Luca ^{[1
]}

Fasano, Matteo ^{[1
]}

Lavagna, Luca ^{[2
]}

Humbert, Gabriele ^{[1
]}

Sani, Elisa ^{[3
]}

Pavese, Matteo ^{[2
]}

Chiavazzo, Eliodoro ^{[1
]}

Asinari, Pietro ^{[1
]}

机构：

[1] Politecn Torino, Dept Energy, Corso Duca Abruzzi 24, I-10129 Turin, Italy

[2] Politecn Torino, Dept Appl Sci & Technol, Corso Duca Abruzzi 24, I-10129 Turin, Italy

[3] CNR, CNR INO, Natl Inst Opt, Largo E Fermi 6, I-50125 Florence, Italy

来源：

SCIENTIFIC REPORTS | 2019年 / 9卷 / 1期

关键词：

THERMAL-CONDUCTIVITY; OPTICAL-CONSTANTS; HEAT-TRANSFER; NANOFLUIDS; TEMPERATURE; WATER; NANOMATERIALS; OPTIMIZATION; PERFORMANCE; RECEIVERS;

D O I：

10.1038/s41598-019-39032-5

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Despite their promising thermo-physical properties for direct solar absorption, carbon-based nanocolloids present some drawbacks, among which the unpleasant property of being potentially cytotoxic and harmful to the environment. In this work, a sustainable, stable and inexpensive colloid based on coffee is synthesized and its photo-thermal properties investigated. The proposed colloid consists of distilled water, Arabica coffee, glycerol and copper sulphate, which provide enhanced properties along with biocompatibility. The photo-thermal performance of the proposed fluid for direct solar absorption is analysed for different dilutions and compared with that of a traditional flat-plate collector. Tailor-made collectors, opportunely designed and realized via 3D-printing technique, were used for the experimental tests. The results obtained in field conditions, in good agreement with two different proposed models, show similar performance of the volumetric absorption using the proposed coffee-based colloids as compared to the classical systems based on a highly-absorbing surface. These results may encourage further investigations on simple, biocompatible and inexpensive colloids for direct solar absorption.

引用

页数：11

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