Productivity intensification of humidification–dehumidification desalination unit by using pulsed water flow regime

El-Shazly, A.H.; Al‐Zahrani, Ahmed; Alhamed, Yahia A.; Nosier, S. A.

doi:10.1016/j.desal.2012.02.023

Cited by 20 publications

(7 citation statements)

References 30 publications

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“…MD exhibits many advantages over the conventional desalination techniques [6][7][8] such as lower energy consumption than that the multi-stage flash distillation, lower working pressure than that the Reverse Osmosis (RO) processes, low fouling phenomena compared to the RO desalination process [9][10][11] and almost 100% salt rejection. One of the major factors hindering MD development is the existence of membranes with a reasonable cost [12,13].…”

Section: Introductionmentioning

confidence: 99%

Triple-Layer Nanocomposite Membrane Prepared by Electrospinning Based on Modified PES with Carbon Nanotubes for Membrane Distillation Applications

et al. 2020

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In this work, a novel triple-layer nanocomposite membrane prepared with polyethersulfone (PES)/carbon nanotubes (CNTs) as the primary bulk material and poly (vinylidene fluoride-co-hexafluoro propylene) (PcH)/CNTs as the outer and inner surfaces of the membrane by using electrospinning method is introduced. Modified PES with CNTs was chosen as the bulk material of the triple-layer membrane to obtain a high porosity membrane. Both the upper and lower surfaces of the triple-layer membrane were coated with PcH/CNTs using electrospinning to get a triple-layer membrane with high total porosity and noticeable surface hydrophobicity. Combining both characteristics, next to an acceptable bulk hydrophobicity, resulted in a compelling membrane for membrane distillation (MD) applications. The prepared membrane was utilized in a direct contact MD system, and its performance was evaluated in different salt solution concentrations, feed velocities and feed solution temperatures. The results of the prepared membrane in this study were compared to those reported in previously published papers. Based on the evaluated membrane performance, the triple-layer nanocomposite membrane can be considered as a potential alternative with reasonable cost, relative to other MD membranes.

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Section: Introductionmentioning

confidence: 99%

Triple-Layer Nanocomposite Membrane Prepared by Electrospinning Based on Modified PES with Carbon Nanotubes for Membrane Distillation Applications

et al. 2020

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“…From the above it is clear that pulsation or vibration can be considered as a good tool for enhancing the rate of mass and/or heat transfer in the humidification process. Previous investigations by the authors [31] on the effect of pulsation on humidification unit performance showed that the unit productivity has been increased by increasing the off time i.e. decreasing the frequency of pulsed water flow up to certain levels and that increasing the amplitude of water pulsation (water flow per pulse) was found to increase the unit productivity as well.…”

Section: Introductionmentioning

confidence: 92%

“…In a previous investigation by the authors of the same system [31] the performance of the condenser under different conditions of water flow rate was studied and the heat transfer coefficient was found to be 38.25 W/m·K. The tabulated data for the average overall heat transfer coefficient for finned tube heat exchanger where there is water flowing inside tubes and air in the cross flow is within the range from 25 to 50 W/m·K [33].…”

Section: Analysis Of the Condenser Unitmentioning

confidence: 99%

Effect of fixed bed characteristics on the performance of pulsed water flow humidification-dehumidification solar desalination unit

El-Shazly

Al‐Zahrani

Alhamed

et al. 2013

Desalination and Water Treatment

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Nosier (2013) Effect of fixed bed characteristics on the performance of pulsed water flow humidification-dehumidification solar desalination unit, Desalination and Water A B S T R A C TThis work investigates the effect of fixed bed characteristics on the performance a of pulsed flow humidification-dehumidification (HD) solar desalination unit. The results show that the unit performance has been improved by increasing the Raschig ring diameter and increasing the distance between layers up to a certain limit and by decreasing the bed height. The solar collector located in Jeddah Saudi Arabia was investigated under different conditions of feed water flow rate, tilt angle, and area of the collector. An equation for the collector efficiency and performance was derived. The power loss in the condenser was calculated to be 2.125 W. The results showed that the productivity of the unit within the range of data studied can be within the range from 1.3 to 1.9 l/m 2 ·h and the gain output ratio of the pulsed flow system to be within the range of 1.80-2.74.

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“…Yamali and Solmus 3 conducted experimental investigation of HDH system and compared the obtained results with the results obtained from the theoretical analysis, and they reported that increasing the raw water temperature and flow rate increases the fresh water productivity. Investigation of the effect of pulsed water flow on the performance of HDH system has been conducted by El‐Shazly et al 4 It has been found that the fresh water productivity increases by using pulses water flow compared to continuous flow. Humidification process can be performed either by spray humidifier or pad humidifier, and previous studies revealed that pad humidifier is more appropriate for air humidification 5 .…”

Section: Introductionmentioning

confidence: 99%

Augmentation of solar‐assisted humidification‐dehumidification water desalination system using heat recovery and thermal energy storage system

et al. 2020

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Summary In previous investigations, humidification‐dehumidification (HDH) solar‐assisted desalination systems were designed produce the daily fresh water during sun hours which lead to big sizes and unsteady systems. In the present study, integration of solar‐assisted HDH desalination system with heat recovery and thermal energy storage unit is developed to enhance system productivity, reduces auxiliary power consumptions and system size and assure system continuous operation. The mathematical modelling based on energy and mass conservation equations is presented and solved using iterative techniques by C++ and engineering equation solver software. Detailed parametric study of the developed system is conducted for wide ranges of operating conditions and design parameters to study the effects of integrating the HDH system with solar collectors, heat recovery and thermal energy storage units on the system performance. The results revealed that (i) this integration improves system productivity and reduces operating cost, (ii) increasing air to water mass ratio and sea water temperature and decreasing ambient humidity decrease water productivity and gained output ratio (GOR) and increase operating cost parameter (OCP) and (iii) increasing air inlet temperature and sea water flow rates increase GOR and decrease OCP. Comparison with previous systems showed that the proposed system reduces the electric heating power of the system at solar noon by 37% at MR = 0.5 and gives daily fresh water productivity (123.7 kg/h) two times more than previous systems with comparable OCP (0.099 $/kg).

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Productivity intensification of humidification–dehumidification desalination unit by using pulsed water flow regime

Cited by 20 publications

References 30 publications

Triple-Layer Nanocomposite Membrane Prepared by Electrospinning Based on Modified PES with Carbon Nanotubes for Membrane Distillation Applications

Triple-Layer Nanocomposite Membrane Prepared by Electrospinning Based on Modified PES with Carbon Nanotubes for Membrane Distillation Applications

Effect of fixed bed characteristics on the performance of pulsed water flow humidification-dehumidification solar desalination unit

Augmentation of solar‐assisted humidification‐dehumidification water desalination system using heat recovery and thermal energy storage system

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