Field investigation of a hybrid photovoltaic-photothermic-radiative cooling system

Hu, Mingke; Zhao, Bin; Ao, Xianze; Zhao, Ping; Su, Yuehong; Pei, Gang

doi:10.1016/j.apenergy.2018.09.137

Cited by 54 publications

(23 citation statements)

References 52 publications

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“…These phenomena should be investigated more thoroughly (since it can affect the general economic aspect of the specific considered cooling techniques). Radiative cooling technique was investigated where hybrid solar collector was proposed and experimentally tested, which can produce electricity and thermal output and finally with provided cooling capacity at the night. Overall, electric/thermal efficiency of the hybrid collector ranged from about 40% to almost 57%.…”

Section: Introductionmentioning

confidence: 99%

Further progress in the research of fin‐based passive cooling technique for the free‐standing silicon photovoltaic panels

et al. 2019

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Summary The paper deals with a passive air‐based cooling technique of photovoltaic (PV) panels in operating conditions. Cooling technique is done by specific type of using aluminium fins, and its main purpose is to increase the electrical efficiency of the PV panel. An increase in electrical efficiency can be achieved because of temperature degradation effect, where the PV panel yields less power at higher operating temperatures (the PV panel's efficiency can drop by up to 0.5%/°C). To confirm a cooling technique, a medium‐sized PV system was used in a 2‐month experiment. The experiment was done in realistic operating conditions, and all working parameters were thoroughly measured. After the analysis of the data, no significant raise in electrical efficiency was recorded throughout the experiment. A numerical approach was conducted, based on gained experimental data. Developed numerical model gave explanations of experimental results and provided an insight in heat flow through the PV cell. Later on, developed numerical model was used to propose new cooling variations of the fin‐based technique and to further examine the overall potential of air based passive cooling techniques. It was shown that cooling effect by up to 5°C is a realistic expectation for this technique in described operating conditions.

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Section: Introductionmentioning

confidence: 99%

Further progress in the research of fin‐based passive cooling technique for the free‐standing silicon photovoltaic panels

et al. 2019

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“…Radiative Cooling efficiency: The efficiency for the radiative cooling mode is based on the one presented in [41] but considering the surface temperature of the RCE device instead of ambient temperature to determine the infrared radiation emitted in the effective outgoing infrared radiation term.…”

Section: Determination Of Performance Parametersmentioning

confidence: 99%

Combined Radiative Cooling and Solar Thermal Collection: Experimental Proof of Concept

et al. 2020

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Climate change is becoming more important day after day. The main actor to decarbonize the economy is the building stock, especially in the energy used for Domestic Hot Water (DHW), heating and cooling. The use of renewable energy sources to cover space conditioning and DHW demands is growing every year. While solar thermal energy can cover building heating and DHW demands, there is no technology with such potential and development for space cooling. In this paper, a new concept of combining radiative cooling and solar thermal collection, the Radiative Collector and Emitter (RCE), through the idea of an adaptive cover, which uses different material properties for each functionality, is for the first time experimentally tested and proved. The RCE relies on an adaptive cover that uses different material properties for each functionality: high spectral transmittance in the solar radiation band and very low spectral transmittance in the infrared band during solar collection mode, and high spectral transmittance in the atmospheric window wavelength during radiative cooling mode. Experiments were performed during the summer period in Lleida (Dry Mediterranean Continental climate). The concept was proved, demonstrating the potential of the RCE to heat up water during daylight hours and to cool down water during the night. Daily/nightly average efficiencies up to 49% and 32% were achieved for solar collection and radiative cooling, respectively.

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“…Due to the limitation of measurement instruments, the uncertainties of indirect measurement values (f) must be calculated, i.e., temperature difference, maximum output power, electrical efficiency. The uncertainty data (U f ) is defined as [26] U f ¼ ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffiffi…”

Section: Uncertainty Analysismentioning

confidence: 99%

Research on a floating thermoelectric power generator for use in wetland monitoring

Zhang

et al. 2020

PLoS ONE

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A floating power generation device is designed and fabricated to overcome the power supply limitations of wireless sensor networks for environmental monitoring. Once there is a temperature difference between the upper surface exposed to sunlight and the lower surface in the water, the device is capable of generating power while floating in the wetland environment. Fresnel lenses were applied to concentrate solar irradiation on a selective absorbing coat. Meanwhile two vertical axis rotors were used to cool the cold side of the thermoelectric power generator by catching the breeze. The effects of solar irradiation, temperature distribution, load resistance, wind speed, the maximum power and the electrical efficiency of the thermoelectric power generator were analyzed. When subjected to solar irradiation of 896.38 W/m 2 , the device generated a potential difference of 381.03 mV and a power output of 8.86 mW via thermoelectric generation. In addition, compared with the system without wind, the output power was increased by approximately 10.96% in our system. The low power wireless networks, used in wetland environments, could be operated by the thermoelectric power generated by the floating device. Besides, this system offers powering solution for self-power miniature devices that are applied in aqueous environment.

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Field investigation of a hybrid photovoltaic-photothermic-radiative cooling system

Cited by 54 publications

References 52 publications

Further progress in the research of fin‐based passive cooling technique for the free‐standing silicon photovoltaic panels

Further progress in the research of fin‐based passive cooling technique for the free‐standing silicon photovoltaic panels

Combined Radiative Cooling and Solar Thermal Collection: Experimental Proof of Concept

Research on a floating thermoelectric power generator for use in wetland monitoring

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