Flexible management of heat/electricity of novel PV/T systems with spectrum regulation by Ag nanofluids

Zhang, Chunxiao; Shen, Chao; Wei, Shen; Zhang, Yingbo; Sun, Chuang

doi:10.1016/j.energy.2021.119903

Cited by 47 publications

(3 citation statements)

References 38 publications

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“…In contrast with the two step method, when the Ag NFSF prepared using the one step method was utilised, the HPVT system could have larger energy and exergy outputs. Zhang et al [27,28] proposed an HPVT system using Ag NFSF for the building integrated with photovoltaics. The HPVT system utilised Ag NFSF to regulate the operating modes to adapt to the changes in the external environment.…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Thermodynamic Performances of a Linear Fresnel Reflector Photovoltaic/Thermal System Using Ag/Water and Ag-CoSO4/Water Nano-Fluid Spectrum Filters

Jiang,

Zou,

Wang

2023

Sustainability

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Renewable energy represented by solar energy has played an important role in the transformation of the energy consumption structure of the world. This study describes and studies a hybrid photovoltaic/thermal (HPVT) system using a linear Fresnel reflector concentrator (LFRC) and nano-fluid spectrum filter (NFSF). The method of designing the HPVT system is provided. Ag/water and Ag-CoSO4/water NFSFs used for this HPVT system were prepared and experimentally tested. Optical analysing results indicate that the optical efficiencies of the PV cell module (PVCM) and NFSF are 0.7556 and 0.9053 under the condition of 0.3° solar tracking error (STE), demonstrating good adaptable capacity to the STE. Moreover, the operating performances of the HPVT system using different NFSFs are compared. The comparison results demonstrate that compared with the Ag/water NFSF, the introduction of CoSO4 can enhance the thermal performance but decrease the photovoltaic efficiency of the HPVT system. When the Ag-CoSO4/water (1.2 mg–3 g/130 mL) NFSF is used, the photovoltaic and thermal efficiencies of the whole HPVT system are 0.1366 and 0.4259, and the overall exergy efficiency is 0.209. The exergy efficiency of the HPVT system will be improved if the NFSF temperature is increased appropriately or if the external convection heat transfer coefficient and environment temperature are reduced.

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Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Thermodynamic Performances of a Linear Fresnel Reflector Photovoltaic/Thermal System Using Ag/Water and Ag-CoSO4/Water Nano-Fluid Spectrum Filters

Jiang,

Zou,

Wang

2023

Sustainability

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“…The researchers studied the effect of the proposed fluid numerically on the thermal and electrical properties of the system. Many studies investigated the addition of different nanoparticles that have metallic and non-metallic sources to form efficient cooling fluids [14][15][16]. Also, many studies focused on the type of base fluid and its effect on heat transfer in nanofluids [17][18][19].…”

Section: -Introductionmentioning

confidence: 99%

Photovoltaic Module Electrical Efficiency Enhancement Using Nano Fluids and Nano-Paraffin

Chaichan

Zaidi²,

Kazem

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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Today, photovoltaic modules have become accepted by the public and scientists in the production of clean electricity and as a possible alternative to electricity produced from fossil fuels. These modules suffer from a deterioration in their electrical efficiency as a result of their high temperature. Several researchers have proposed the use of high-efficiency hybrid photovoltaic (PV/T) systems that can cool PV modules and also produce hot water. Improving the PV modules’ electrical efficiency increases the investment attraction and commercialization of this technology. The possibility of restoring the electrical efficiency of the photovoltaic panel that was lost due to its high temperature was investigated in this study. A PV/T system designed to operate with a paraffin-filled thermal tank attached to the PV module was used. Inside the paraffin is a heat exchanger that circulates inside a nanofluid. This design is adopted to cool down the PV module temperature. The study was carried out in the climatic conditions of the month of May in the city of Baghdad - Iraq. The proposed PV/T system’s electrical efficiency was compared with similar systems from the literature. The proposed system has achieved an obvious enhancement as its electrical efficiency was 13.7%.

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“…Reference [15] proposed the use of nanofluid, which is a base fluid, in water, with nanoparticles added to it, to enhance heat transfer rate from the PV module body to a thermal collector. This method has been studied in detail by many researchers, using many types of nanoparticles, with metallic and non-metallic sources, to discover the best fluids to use in PV/T systems for optimal performance [16][17][18]. Many studies have also focused on evaluating several types of base fluid, and examining their effects on the rate of heat transfer [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Adding Nano-TiO2 to Water and Paraffin to Enhance Total Efficiency of a Photovoltaic Thermal PV/T System Subjected to Harsh Weathers

et al. 2022

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Iraq is characterized by hot and sunny weather with high radiation intensity. These conditions are suitable to produce photovoltaic electricity, on the one hand, but on the other hand are not suitable for photovoltaic modules whose efficiency decreases with increasing temperature. In this study, a photovoltaic module was practically cooled by two PV/T systems, one cooled by water and the other by nanofluid and nano-paraffin. Iraqi-produced paraffin was used in this study for its cheap price, and because its melting and freezing temperature (46 °C) is close to the operating range of photovoltaic modules. Nano-TiO2 was adopted as an additive to water and paraffin. The study results showed an obvious enhancement of the thermal conductivity of both water and paraffin, by up to 126.6% and 170%, respectively, after adding a 2% mass fraction of nano-TiO2. The practical experiments were carried out outdoors in the city of Baghdad, Iraq. A fluid mass flow rate of 0.15 kg/s was selected for practical reasons, since at this rate the system operates without vibration. The PV panel’s temperature, in the PV/T system (nano-fluid and nano-paraffin), decreased by an average of 19 °C when the tested systems operated during the peak period (12 PM to 3 PM). The decrease in temperatures of the PV module caused a clear improvement in its electrical efficiency, as it was 106.5% and 57.7% higher than the PV module (standalone) and water-cooled PV system, respectively. The thermal efficiency of this system was 43.7% higher than the case of the water-cooled PV/T system. The proposed system (nano-fluid and nano-paraffin) provides a greater possibility of controlling the heat capacity and increasing both efficiencies (electrical and thermal), when compared to a standalone PV module, in harsh Iraqi weather.

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Flexible management of heat/electricity of novel PV/T systems with spectrum regulation by Ag nanofluids

Cited by 47 publications

References 38 publications

Comparative Analysis of Thermodynamic Performances of a Linear Fresnel Reflector Photovoltaic/Thermal System Using Ag/Water and Ag-CoSO4/Water Nano-Fluid Spectrum Filters

Comparative Analysis of Thermodynamic Performances of a Linear Fresnel Reflector Photovoltaic/Thermal System Using Ag/Water and Ag-CoSO4/Water Nano-Fluid Spectrum Filters

Photovoltaic Module Electrical Efficiency Enhancement Using Nano Fluids and Nano-Paraffin

Adding Nano-TiO2 to Water and Paraffin to Enhance Total Efficiency of a Photovoltaic Thermal PV/T System Subjected to Harsh Weathers

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