Experimental investigation of performance for the novel flat plate solar collector with micro-channel heat pipe array (MHPA-FPC)

Deng, Yuechao; Zhao, Yi; Wang, Wei; Quan, Zhenhua; Wang, Lin-Cheng; Dan, Yu

doi:10.1016/j.applthermaleng.2013.02.001

Cited by 125 publications

(41 citation statements)

References 17 publications

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“…Figure 1 gives a sketch of the collector. The model and the disposition of the system´s parts of the panel were based on model described by Deng et al (2013).…”

Section: Flat Plate Collectormentioning

confidence: 99%

<b>Analysis of absorbed energy and efficiency of a solar flat plate collector

et al. 2017

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ABSTRACT. The highest percentage in home electricity demands in Brazil lies with the water heating systems, where the electric shower has a great contribution in consumption. The use of solar thermal panels is an alternative to minimize the strain on the electrical system by heating water. Current study evaluates a water heating system built with materials commonly used in home constructions. The tested collector is a 1 m² flat plate. Experiments were conducted at the State University of Western Paraná (UNIOESTE), campus Cascavel, Paraná State, Brazil. Temperature data were collected by PT100 sensors and solar radiation was measured with a pyranometer, coupled to a CR-1000 datalogger, with readings and collection every 5 minutes for 1 year. Data collection and analysis showed that the system presented monthly efficiency ranging between 33.7 and 53.54%, and energy absorbed between 30.79 and 75.29 kWh m -².month. Results show the system is a good option for use in residential or rural water heating due to decrease in the electric bill.Keywords: flat plate collector, electricity demand, water heating system, solar radiation, pyranometer.Análise da energia absorvida e eficiência de um coletor solar de placa plana RESUMO. A maior parcela da demanda de energia elétrica no setor residencial no Brasil é consumida por sistemas de aquecimento de água, e o chuveiro elétrico tem grande contribuição no consumo. Visando minimizar a pressão sobre o sistema elétrico por parte do aquecimento de água, uma alternativa é o uso dos painéis termossolares. O objetivo deste trabalho foi avaliar um sistema de aquecimento termossolar construído com materiais comumente encontrados em construção civil, sendo o coletor ensaiado do tipo placa plana com 1 m² de dimensão. Os experimentos foram conduzidos na Unioeste (Universidade Estadual do Oeste do Paraná), no campus de Cascavel-PR, sendo que a coleta dos dados de temperatura foi feita com sensores PT100, a radiação solar com um Piranômetro, todos acoplados a um datalogger CR-1000, que realizou leituras e coleta a cada 5 min durante um ano. Após a coleta e análise dos dados, verificou-se que o sistema apresentou eficiências mensais variando de 33,7 a 53,54%, e a energia absorvida mensal variou de 30,79 a 75,29 kWh m -² mês. Assim, este sistema representa uma boa opção para ser utilizado em aquecimento de água residencial ou rural, reduzindo a conta de energia elétrica.Palavras-chave: coletor placa plana, demanda de energia elétrica, sistema de aquecimento de água, radiação solar, piranômetro.

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“…Figure 1 gives a sketch of the collector. The model and the disposition of the system´s parts of the panel were based on model described by Deng et al (2013).…”

Section: Flat Plate Collectormentioning

confidence: 99%

<b>Analysis of absorbed energy and efficiency of a solar flat plate collector

et al. 2017

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“…In traditional solar thermal systems, round copper heat pipes are applied to the solar heat collectors [5][6][7]; however, this type of heat pipe is not a desired solution due to its high weight, small surface-volume ratio, and large size [8]. A novel micro flat aluminium heat pipe array (MF-AHPA) [9] provides a promising method for significantly improving solar heat collection due to its high in-plane thermal conductivity, high reliability, strength, and relatively low cost.…”

Section: Introductionmentioning

confidence: 99%

“…For example, Deng et al developed a flat plate solar collector using a MF-AHPA to achieve a maximum efficiency of 80%, accounting for 25% enhancement over the average efficiency on other alternatives [8]. Zhu et al developed a solar air heater using flat micro heat pipe arrays.…”

Section: Introductionmentioning

confidence: 99%

Thermal Characterisation of Micro Flat Aluminium Heat Pipe Arrays by Varying Working Fluid and Inclination Angle

et al. 2018

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Featured Application: solar collector; solar thermal system; thermal energy storage system; heat exchanger.Abstract: A micro heat pipe array is desirable owing to its high heat transfer capacity, compact size, and high surface-volume ratio compared with conventional heat pipes. In this study, micro flat aluminium heat pipe arrays (MF-AHPA) were developed and systematically characterised by varying working fluid and inclination angle. Three MF-AHPAs with different working fluids, i.e., acetone, cyclopentane, and n-hexane, were fabricated. The acetone MF-AHPA achieved the best thermal performance. The underlying mechanism is the small flow viscous friction and small shearing force of liquid vapour. Additionally, the experimental results show a strong dependence of MF-AHPAs' thermal resistance on the orientation due to the gravitational effect on axial liquid distribution. Finally, a criterion is proposed to determine the optimal inclination angle of the MF-AHPA. In the present study, a volumetric fraction (α a,c ) of 74 ± 7% has been shown to well predict an optimal inclination angle of the MF-AHPAs with various working fluids and heat loads.

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“…Some scholars who have applied micro-channels to solar collectors include Mansour [28]; who looked at flat plate rectangular channelled absorber plate, Sharma and Diaz [29]; who investigated its application in evacuated tube collector and Deng, et al [30] who studied a novel FPC with micro-channel heat pipe array. Moss et al [31] presented a method for identifying the optimum channel size based on pumping power limit.…”

Section: Introductionmentioning

confidence: 99%

Characterising micro-channel absorber plates for building integrated solar thermal collectors

Oyinlola

Shire

2018

Building Services Engineering Research and Technology

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Abstract.This paper discusses the characterisation of micro-channel absorber plates for Compact Flat Plate solar thermal collectors. Experimental and computational studies were carried out at typical operating conditions for flat plate solar collectors; overall heat loss coefficient in the range 2 -8 W/m 2 .°C, flow rate in the range 0.01 -0.1 kg/s/m 2 and heat transfer coefficients in the range 100 -1000 W/m 2 .°C. Three Dimensional numerical analysis using commercial CFD package, Ansys CFX, showed that heat transfer occurred on only three surfaces of the channel and there was a peripheral variation of the heat flux density. It was also observed that axial thermal conduction could modify the surface boundary at the inlet and outlet, however, the middle section of the channel could be approximated as a rectangular channel with three walls transferring heat under a H1 boundary condition. Experimental studies were used to estimate the standard parameters (channel efficiency, F, collector efficiency factor, F', heat removal factor, FR, and flow factor F") for predicting performance of the flat plate collectors. An alternate parameter, channel efficiency, F, was proposed to replace Fin efficiency, F, used in standard collector analysis. The results showed that values of F and F', very close to unity could be achieved with this design when the overall heat loss coefficient is below 2 W/m 2 .°C. The analysis further revealed that increasing the fluid-plate heat transfer coefficient beyond 300 W/m 2 .°C has marginal effect on the collector efficiency factor at a given UL value. The collector flow factor F" and the heat removal factor could be improved by increasing the collector capacitance rate; this can be achieved by increasing the mass flow rate per collector area ̇/ , as well as reducing the overall heat loss, UL . This analysis is important for optimizing design and operating parameters, especially to minimize temperature gradient in the transverse and longitudinal directions.

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Experimental investigation of performance for the novel flat plate solar collector with micro-channel heat pipe array (MHPA-FPC)

Cited by 125 publications

References 17 publications

<b>Analysis of absorbed energy and efficiency of a solar flat plate collector

<b>Analysis of absorbed energy and efficiency of a solar flat plate collector

Thermal Characterisation of Micro Flat Aluminium Heat Pipe Arrays by Varying Working Fluid and Inclination Angle

Characterising micro-channel absorber plates for building integrated solar thermal collectors

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