| Photovoltaic/therma(PV/T)utilization technology is attracting more and more attention because it can obtain electric energy and heat energy simultaneously.Among them,the photoelectric thermoelectric system combined with the temperature difference power generation technology and PV/T system effectively alleviates the problem of high heat load of PV battery,and converts the heat energy in PV/T system into electric energy.However,the current photoelectric thermoelectric system is passive cooling of PV cells,which does not fundamentally solve the problem of spectral mismatch of PV cells.Therefore,in this paper,the electro-optical and thermoelectric system based on nano-fluid frequency division is proposed.ZnO nano-fluid is used as the frequency division liquid to build the electro-optical and thermoelectric system based on nano-fluid frequency division and the electro-optical and thermoelectric system based on nano-fluid concentrated light frequency division.The thermal and electrical properties of the two systems are studied experimentally.ZnO nanofluids were prepared by one-step method.The stability of ZnO/ Ethylene glycol(EG)nanofluids with different concentrations was verified by sedimentation observation method.The optical properties of ZnO/EG nanofluids were investigated by ultraviolet and visible near-infrared spectrophotometer.The results show that there is no precipitation in the ZnO/EG nanofluid standing still for 7 days,and the prepared egbased ZnO nanofluid has excellent stability.ZnO/EG nanofluids have good transmission properties in the frequency division window range of 400-1100 nm band and good absorption properties in the infrared band.A photoelectric thermoelectric experimental platform based on nano-fluid frequency division is built.The influence of nano-fluid concentration,nano-fluid flow and cooling water temperature on the power generation performance of the system was studied.The output power of the thermoelectric battery was calculated by voltammetry.The results show that when the cooling water temperature is 5 ?,the current of the thermoelectric battery reaches 112.56 m A.Compared with the cooling water at 25 ?,the current of the thermogenerator increased by 3.56 times.Under the conditions of 80 PPM ZnO/EG nanofluid as circulating liquid,flow rate of 5 m L/min,cooling water temperature of 20 ?,and ambient temperature of 26 ?,the maximum output power of the thermoelectric battery in the system is 1.31 m W.Combined with the concentrator to further improve the electrical performance of the system,the electro-optical and thermoelectric experimental system based on nanofluid concentrator frequency division was constructed.The effects of nano-fluid concentration,nano-fluid flow rate and cooling water temperature on the power generation performance of the nano-fluid concentration-frequency division optoelectronic and thermoelectric system were studied,and the stability of the system was verified.The results show that when the cooling water temperature is 5 ?,the current of the thermoelectric battery reaches 139.70 m A.Compared with the cooling water at 25 ?,the current of the thermoelectric battery increased by 2.77 times.The stability of the whole system is good.When 80 PPM ZnO/EG was used as circulating liquid,flow rate was 5 m L/min,cooling water temperature was 20 ?,and ambient temperature was 26 ?,the maximum output power was 2.73 m W. |
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