Improving the Solar Collector Base Model for PVT System

Minakova, Kseniia; Зайцев, Р. В.

doi:10.21272/jnep.12(4).04028

Cited by 18 publications

(7 citation statements)

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“…In earlier works [5][6][7], only options for heat removal from the tube along its surface were considered without losses when passing through the heat absorber plate that is a kind of heat absorber (absorber on which the tube is installed) and heat loss of the adsorbing surface.…”

Section: Introductionmentioning

confidence: 99%

Uniaxial Heat Balance Model of the Solar Collector

Minakova¹,

Зайцев²

2021

J. Nano- Electron. Phys.

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Section: Introductionmentioning

confidence: 99%

Uniaxial Heat Balance Model of the Solar Collector

Minakova¹,

Зайцев²

2021

J. Nano- Electron. Phys.

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“…where 𝑚̇ is the mass flow rate of the coolant in the collector, n is the number of parallel tubes in the collector [2]. Dividing by 𝑦, finding the limit when y tends to zero, and substituting equation (1) instead of 𝑞 𝑢 ′ , we get…”

Section: -2mentioning

confidence: 99%

“…This value is called the heat removal coefficient of the collector 𝐹 𝑅 . In the form of an equation, it is expressed [2]:…”

Section: (7)mentioning

confidence: 99%

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Biaxial Heat Balance Model of a Solar Collector

Minakova¹,

Zaitsev²

2022

J. Nano- Electron. Phys.

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In research, solar collectors and photovoltaic systems (PV/T) are considered, which are one of the most promising systems of renewable energy sources. Electricity, which is produced by photovoltaic panels, has great potential, but there may be technological shortcomings, which do not give maximum efficiency. The main goal of our research is to develop a universal model of heat exchange processes for optimizing the design features of PV/T systems at the stages of design and variability, which allows us to increase the term of service of such systems and their efficiency. The expanded model allows you to change more practical parameters for two coordinates of a flat collector, such as to change the consumption of thermal energy, thermal support of the absorber plate, heat exchange, operating temperature, etc. The results of model investigations correlate with the experimental data. On the basis of the proposed model, a software product for the modeling of PV/T systems was developed and tested on the experimental results of those ready-towear PV/T systems. In the course of carrying out the expansions, depending on the basic parameters, the heating was removed when one segment of the collector was passed by approximately 1.5 °C. The designated increase in temperature was reached at a heat transfer rate of 0.6 m/s, which allows high rates to be achieved. The most optimal will be the heating when passing through the collector by 5 °C, which will allow to reduce the heat transfer rate to 0.2 m/s and significantly reduce the amount of electricity consumed by the pump. The variation of the expanded model allows to implement a wide range of optimization tasks at the stages of designing and optimizing solar collectors and PV/T systems, to take the optimal design parameters to achieve the greatest efficiency and minimum occupancy.

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“…The quantity N() included in (4) can be expressed in terms of the light intensity ILI() [8], coming to the surface of the SC:…”

Section: -2mentioning

confidence: 99%

Analysis of Mechanisms to Increase the Industrial Silicon Solar Cell Efficiency

Kirichenko¹,

Зайцев²,

Minakova³

et al. 2021

J. Nano- Electron. Phys.

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Possibilities of increasing the efficiency by more than 20 % for silicon photoelectric converters made in China have been investigated. It has been established by the method of computer simulation that the lifetimes of nonequilibrium charge carriers, which are 520 s, realized in such photoelectric converters, do not limit the possibility of increasing their efficiency by more than 20 %. It has been shown that an increase in the photocurrent density to 43.1 mA/cm 2 leads to an increase in the efficiency to 20.1 %, and a decrease in the diode saturation current density to 3.1•10 -14 A/cm 2 leads to an increase in the efficiency to 20.4 %. Simultaneous change of these diode characteristics leads to an increase in the efficiency to 23.1 %. The paper proposes physical and technological approaches to increase the photocurrent density and reduce the diode saturation current density in ready-made photovoltaic converters. The study of the influence of operating temperature on the efficiency of crystalline silicon photoelectric converters has been carried out in the article. It has been shown that with increasing operating temperature the relative decrease in the efficiency of single-crystal devices is -0.7 relative %/C, which is significantly higher than in the device structures of European production and due to non-traditional decrease in short-circuit current density. Mathematical modeling of the influence of light-emitting diode characteristics on the efficiency of crystalline silicon solar cells showed that a decrease in the efficiency of device structures with increasing operating temperature is due not only to an increase in diode saturation current density from 10 -13 to 3•10 -13 A, which is 300 %, but also by reducing the shunt resistance from 2.5 to 1.5 kOhm. A study of the effect of operating temperature on the diode saturation current showed that the height of the potential barrier in the studied silicon photovoltaic converters is 0.87 eV due to the insufficient level of doping of the base material. The limited height of the potential barrier leads to an unconventional decrease in the shunt resistance with increasing operating temperature.

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Improving the Solar Collector Base Model for PVT System

Cited by 18 publications

References 0 publications

Uniaxial Heat Balance Model of the Solar Collector

Uniaxial Heat Balance Model of the Solar Collector

Biaxial Heat Balance Model of a Solar Collector

Analysis of Mechanisms to Increase the Industrial Silicon Solar Cell Efficiency

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