Mathematical modeling and sensibility analysis of a solar humidification-dehumidification desalination system considering saturated air

Campos, Bruno Lacerda de Oliveira; Costa, Andréa Oliveira Souza da; Junior, Esly Ferreira da Costa

doi:10.1016/j.solener.2017.08.029

Cited by 33 publications

(9 citation statements)

References 29 publications

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“…0.08% v/v and 12.00% v/v), a better distribution of each point's importance can be made with introducing weights. Common approaches are the inverse of squared experimental value, 45,46 the inverse of the squared simulated value, 47 or the inverse of experimental multiplied by simulated value. 48 Here, the inverse of the squared experimental value was used as weights.…”

Section: Estimation Of the Active Catalytic Areamentioning

confidence: 99%

Surface reaction kinetics of the methanol synthesis and the water gas shift reaction on Cu/ZnO/Al₂O₃

et al. 2021

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Section: Estimation Of the Active Catalytic Areamentioning

confidence: 99%

Surface reaction kinetics of the methanol synthesis and the water gas shift reaction on Cu/ZnO/Al₂O₃

et al. 2021

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“…Eslamimanesh et al [4] modeled a CAOW-AH HDH process and concluded that, heating the air at humidifier inlet and cooling water at dehumidifier inlet increase system productivity, while increasing mass flowrate ratio in humidification column led to lower freshwater flowrate. Campos et al [5] theoretically studied a CAOW-WH through mathematical modeling, and observed that the water productivity can be enhanced by increasing the heat absorption in the solar collector, increasing the humidifier height and decreasing seawater flowrate. The model also showed that the temperature of surrounding environment has marginal to no significant effect on the distillate flowrate.…”

Section: Introductionmentioning

confidence: 99%

Energy and Entropy Analyses of a Pilot-Scale Dual Heating HDH Desalination System

Lawal

Jawad

Sharqawy

et al. 2021

Entropy

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This study focuses on energy and entropy analysis to theoretically investigate the performance of a pilot scale dual heated humidification-dehumidification (HDH) desalination system. Two cases of HDH systems are considered in the analysis. The first case is a dual heated (DH) cycle consisting of 1.59 kW air heater and 1.42 kW water heater with a heat rate ratio of 0.89 (CAOW-DH-I). Whereas the second case is a dual heated HDH cycle comprising of 1.59 kW air heater and 2.82 kW water heater with a heat rate ratio of 1.77 (CAOW-DH-II). As a first step, mathematical code was developed based on heat and mass transfer and entropy generation within the major components of the system. The code was validated against the experimental data obtained from a pilot scale HDH system and was found to be in a good agreement with the experimental results. Theoretical results revealed that there is an optimal mass flowrate ratio at which GOR is maximized, and entropy generation is minimized. Furthermore, the degree of irreversibility within the humidifier component is low and approaches zero, while the specific entropy generation within other components are relatively high and are of the same order of magnitude. Entropy analysis also showed that the dual heated system with heat rate ratio greater than unity is better than the one with heat rate ratio less than unity.

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“…In these regions, the implementation of HDH as a viable technology to supply freshwater would require the use of an alternative heating source. In [7] it is shown that the water temperature plays an important role in the productivity of the freshwater and that an extra heat source, when available, should be located immediately before or after the solar collector. Additional energy sources are also mandatory to guarantee a continuous operation.…”

Section: Introductionmentioning

confidence: 99%

Humidification–dehumidification desalination process using green hydrogen and heat recovery

Brunini

García

Melgarejo

et al. 2021

Environ. Res.: Infrastruct. Sustain.

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We propose the use of green hydrogen as a fuel for a seawater heater in a humidification / dehumidification (HDH) desalination plant to increase its productivity, to allow scaling to large dimensions without negative environmental effects, and to guarantee continuous operation. We develop a mathematical model of the proposed HDH configuration. For operating conditions that guarantee very low NOX production, the fuel consumption is ~0.03 kg of H2 per kg of pure water produced. If the exhaust gases from the seawater heater are used for heat recovery, the GOR of the equipment may increase by up to 39 % in relation to the same equipment operating without heat recovery. The operation cost of freshwater is comparable to the costs obtained by other equipment in the literature. If the water produced in the combustion of hydrogen is condensed during the heat recovery process and then added to the freshwater produced, the production cost is reduced by 20 %. We found that an excess of air in the air+fuel mix beyond the minimum value appropriate for a low NOX generation does not provide significant benefits. The efficiency of the seawater heater has an impact on the production of pure water, but this impact is strongly mitigated by the heat recovery process. Fuel consumption increases proportionally with the decrease in the effectiveness of the heat recovery device, which is a key parameter for optimal performance. A hydrogen heater is also a good alternative as an auxiliary power source to guarantee continuous operation. On sunny hours a H2 heater may be used to increase productivity preheating the seawater, and at night the system could operate 100 % based on H2.

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Mathematical modeling and sensibility analysis of a solar humidification-dehumidification desalination system considering saturated air

Cited by 33 publications

References 29 publications

Surface reaction kinetics of the methanol synthesis and the water gas shift reaction on Cu/ZnO/Al₂O₃

Surface reaction kinetics of the methanol synthesis and the water gas shift reaction on Cu/ZnO/Al₂O₃

Energy and Entropy Analyses of a Pilot-Scale Dual Heating HDH Desalination System

Humidification–dehumidification desalination process using green hydrogen and heat recovery

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Mathematical modeling and sensibility analysis of a solar humidification-dehumidification desalination system considering saturated air

Cited by 33 publications

References 29 publications

Surface reaction kinetics of the methanol synthesis and the water gas shift reaction on Cu/ZnO/Al2O3

Surface reaction kinetics of the methanol synthesis and the water gas shift reaction on Cu/ZnO/Al2O3

Energy and Entropy Analyses of a Pilot-Scale Dual Heating HDH Desalination System

Humidification–dehumidification desalination process using green hydrogen and heat recovery

Contact Info

Product

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Surface reaction kinetics of the methanol synthesis and the water gas shift reaction on Cu/ZnO/Al₂O₃

Surface reaction kinetics of the methanol synthesis and the water gas shift reaction on Cu/ZnO/Al₂O₃