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Carbonbased nanofluid has a higher heat transfer coefficient than other nanofluids and is relatively cheap. Graphene nanofluid has a high heat transfer coefficient, and reduced graphene oxide nanofluid has good stability. So, this article developed a new type of carbonbased composite nanofluid (waterbased graphene/reduced graphene oxide composite nanofluid) as the heat transfer medium in PV/T collectors by twostep method. The radiation intensity, flow rate, and composite nanofluid were analyzed. The effect of proportion on the water temperature at the outlet of the collector was studied, and the proportion of waterbased graphene/reduced graphene oxide with better heat transfer performance was obtained in different compound proportion ranges of the experiment. Experimental results show: the higher the radiation intensity, the faster the flow rate, the higher the water temperature at the outlet of the PV/T collector, the better the heat transfer effect of the nanofluid; when the composite ratio is 8:2, the heat transfer effect of the nanofluid is the best, the thermal efficiency and electrical efficiency of the PV/T system are 23.49% and 20.18% respectively. Compared with waterbased graphene and reduced graphene oxide, nanofluid has better heat transfer effect. The research of this article provides reference for the practical development of carbon nanofluids in heat transfer media.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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