Solar water heating system and photovoltaic floating cover to reduce evaporation: Experimental results and modeling

Taboada, María E.; Cáceres, Luis; Graber, Teófilo A.; Galleguillos, Héctor R.; Cabeza, Luisa F.; Rojas, René S.

doi:10.1016/j.renene.2016.12.094

Cited by 83 publications

(38 citation statements)

References 26 publications

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“…A further advantage of these systems consists of the evaporative cooling of the PV cells, which allows increasing the production efficiency as the temperature of the modules is abated with respect to a classic system on the ground, with the same climatic conditions 9 : energy‐water nexus. The benefits of putting solar modules a topwater bodies include increased economic output per unit of land, improved output (due likely to the cooling effect of water on solar panels) and reduced water evaporation 10,11 . As regards the reduction of evaporation there is a lack of literature studies that investigated the interaction between water body and FPV.…”

Section: Introductionmentioning

confidence: 99%

“…The benefits of putting solar modules a topwater bodies include increased economic output per unit of land, improved output (due likely to the cooling effect of water on solar panels) and reduced water evaporation. 10,11 As regards the reduction of evaporation there is a lack of literature studies that investigated the interaction between water body and FPV. Thus, it is worth of interest to define a methodology that allows determining the evaporation rate of a water body where floating PV system, is operative, so as to attribute an economic value to the water saved.…”

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confidence: 99%

“…Researches based on the energy balance of the basin are reported in Taboada et al and Kumar M. and Kumar A. 11,12 ; however, the possible types of installation and configuration of floating systems are not analyzed. Studies related to the reduction of the evaporation in water basin with coverage surfaces have been developed, where passive surfaces had the sole purpose of reducing evaporation to increase the water storage.…”

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confidence: 99%

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An assessment study of evaporation rate models on a water basin with floating photovoltaic plants

et al. 2020

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Summary Under the general topic of the impact of floating photovoltaics (FPVs) systems on water basins, the present study aims to model and analyze the effect of FPVs on the evaporation rate of water surfaces. The estimation of the evaporation of the water surface of a basin is usually calculated using mathematical evaporation models that require knowledge of some parameters (ie, solar radiation, humidity, air temperature, water temperature, and wind velocity). Thus, in the first section of this study, some evaporative models (EVM) for free water basin have been examined to evaluate which are the environmental variables used. On the basis of this analysis, new numerical models for the calculation of the daily evaporation rate have been developed using the design of experiments (DoE) method (three models) and the linear regression method (two models). The results of the developed models have been compared with the experimental measurements carried out by an evaporimeter; such comparison has highlighted the robustness of the proposed numerical models. Moreover, for estimating the evaporation rate in water basins partially covered by FPVs, further three numerical methods are proposed. Finally, the evaporation rates, arising by the installation of different typology of FPVs on water basins, have been evaluated as function of the energy balance on the water surface. It is possible to highlight that the amount of evaporated water depends not only on the percentage of surface covered but also on the characteristics of floating systems. Covering only 30% of the surface of a basin, it is possible to obtain up to 49% reduction in evaporation.

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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An assessment study of evaporation rate models on a water basin with floating photovoltaic plants

et al. 2020

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“…Similar designs have been reported by several authors like [10], [11]; under meteorological condition of Nigeria. [12] researched on the experimental behavior of a solar water heating system combined with floating covers and photovoltaic cells by using two similar ponds for holding water, one was heated with coil containing an enclosed circulating fluid and the other unheated. To minimize water evaporation the exposed surfaces of the two ponds were covered by floating elements with photovoltaic cells on top to supply energy for water pumping and to power auxiliary devices of the system.…”

Section: Previous Solar Collector Designsmentioning

confidence: 99%

Experimental Study on a Line-Axis Concentrating Solar Energy Collector for Water Heating

Ikpakwu¹

2017

IJFMTS

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This paper examines the experimental study on a line axis concentrating solar energy collector for water heating. The system considered consists of cylindrical solar radiation concentrator with a black coated tubular absorber positioned along its axis. A cold water tank is placed above the collector and a hot water tank positioned below it such that fluid flows in and out of the set up. Solar radiation absorber inlet header is connected to the cold water tank while its outlet header is connected to the hot water tank. These major components are supported by angle iron raised at a distance from the ground that depends on the location and function. Valves are used at strategic points on the connecting pipe lines to isolate the flow of water. When water is poured into the cold water chamber, and the control valve turned on, the water flows under gravity into the receiver/absorber tube. At the absorber section, heat is transferred from the steel tube to the circulating water and is consequently heated. The heated water, then flows into the returning tube against gravity, thereby restricting the heated water from flowing into the storage tank. At this stage, thermo-siphoning effect comes into play. As the temperature of the water increases, its density reduces while the mass remains constant in order to balance the effect of the reduction in density. Thus, there is a resultant increase in volume which consequently pushes the water level further along the returning pipe. Further increase in temperature reduces the water density and increases the volume of the water, thereby causing the heated water to flow into the insulated tank. Several experimental tests were carried out under meteorological condition at the Federal University of Technology Owerri, Nigeria at three different mass flow rates of 0.001kg/s, 0.002kg/s and 0.003kg/s. The solar water heater was tested while oriented in the East-West and North-South directions in order to determine the effects of orientation on the performance. Results obtained showed that a maximum temperature of 69.5°C, corresponding to 34.5°C increase in water temperature and a maximum instantaneous efficiency of 51.01% is possible. The aim of the study is to design a cheaper solar energy system capable of reducing energy bill within the developing countries of the world.

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“…Segundo (Taboada et al, 2017) os painéis solares reduzem em até 90% a evaporação da água dos lagos por evitar essa incidência direta dos raios solares.…”

Section: Considerações Sobre a Energia Fotovoltaicaunclassified

Metodologia Para Estimar O Impacto Do Potencial De Geração Fotovoltaica Nos Projetos Minha Casa Minha Vida Na Operação Do Sistema Elétrico Brasileiro

MANSUR¹

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Solar water heating system and photovoltaic floating cover to reduce evaporation: Experimental results and modeling

Cited by 83 publications

References 26 publications

An assessment study of evaporation rate models on a water basin with floating photovoltaic plants

An assessment study of evaporation rate models on a water basin with floating photovoltaic plants

Experimental Study on a Line-Axis Concentrating Solar Energy Collector for Water Heating

Metodologia Para Estimar O Impacto Do Potencial De Geração Fotovoltaica Nos Projetos Minha Casa Minha Vida Na Operação Do Sistema Elétrico Brasileiro

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