Experimental investigation of a multi-stage humidification-dehumidification desalination system heated directly by a cylindrical Fresnel lens solar concentrator

Wu, Gang; Zheng, Hongfei; Ma, Xinglong; Kutlu, Çağrı; Su, Yuehong

doi:10.1016/j.enconman.2017.04.011

Cited by 93 publications

(18 citation statements)

References 14 publications

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“…It is worth noting that most of the systems with higher GOR are lab-scale system where most of the operating conditions are well controlled with minimum heat lost by the system. Solar Energy (Experiment) 2.1 [21] Solar Energy (Experiment) 0.3154 [17] Solar Energy (Experiment) 0.53 [18] Electric Heater (Experiment) 0.42 [19] Electric Heater (Experiment) 2.7 [22] Electric Heater (Experiment) 1.3 [23] Heat Pump (Experiment) 2.08 [24] Heat Pump (Theory) 2.532 [25] Heat Pump (Theory) 0.76 [26] Heat Pump (Experiment) 2.05 [27] Heat Pump (Theory) 2.476 [28] Heat Pump (Theory) 3.91 [29] Electric Heater (Experiment) 0.756 Present…”

Section: Model Validation With Experimental Datamentioning

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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Section: Model Validation With Experimental Datamentioning

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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“…Wu et al 71 investigated the HDH technique using a direct solar concentrated heating desalination device. The cylindrical Fresnel lens that was utilized as a solar concentrator constructed from a three‐stage isothermal heating mode.…”

Section: Classifications Of Hdh Systemsmentioning

confidence: 99%

“…Therefore, HDH desalination units driven by water heating systems with solar energy could be cost-effective. 27 The solar collectors can be evacuated tube collector (ETC), 85,103,104 flat-plate collector (FPC), [147][148][149] F I G U R E 2 0 Schematic diagram of HDH desalination unit 143 [Colour figure can be viewed at wileyonlinelibrary.com] parabolic trough collector (PTC), 69,70,91 Fresnel lens collector (FLC), 71,150 solar still (SS), 63,64,151,152 or solar pond systems. 72 Different types of electrical energy for heating water in HDH desalination systems were presented by a number of researchers based on electrical heaters 95,100,153 and electrical resistances.…”

Section: Water Heating Systemmentioning

confidence: 99%

Desalination process using humidification–dehumidification technique: A detailed review

et al. 2020

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Summary The lack of fresh water resources is one of the important reasons obstructing progress all over the world. To overcome this crucial situation, the water desalination system (WDS) is progressed, enhanced, and modified. The desalination plant is mostly powered by nonrenewable energy resources, mainly by fossil fuels that make it an expensive and high‐energy‐consuming technology. Therefore, it is indispensable to depend on renewable energy supplies to drive desalination systems. Recently, the total thermal energy desired to operate the humidification–dehumidification desalination systems can be gained from renewable/sustainable energy resources such as geothermal energy and solar energy. Among the different desalination techniques, the HDH is considered one of the most effective desalination techniques to manage the critical issue of shortage of drinking water. The current paper presents a comprehensive review of diverse types of HDH desalination systems as well as their fundamental components. The present work revealed that the seawater HDH system is a promising technology to produce fresh water, particularly for decentralized demand. The packed bed humidifier is the most utilized type in the HDH water desalination system than other types of humidifiers. Furthermore, the direct dehumidifier enhances the performance of HDH desalination system compared to the indirect one. The present study concludes that the hybrid energy systems have the highest gain output ratio, while the thermal energy systems have the lowest gain output ratio. Water heating with solar energy has a significant enhancement in system productivity compared with solar air heating. The HDH WDS incorporated with heat pump achieves appropriate system productivity and gain output ratio with the lowest cost per liter.

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“…The samples are randomly chosen, using the scattering distribution as a probability density. This allows the well-developed techniques of raytracing to be used to model scattering [32]. Solid models were created to obtain the light rays on the receiver.…”

Section: The Optical Simulation Analysis Of the Fixed-focus Fresnel Lmentioning

confidence: 99%

Simulation and Experimental Study on the Optical Performance of a Fixed-Focus Fresnel Lens Solar Concentrator Using Polar-Axis Tracking

et al. 2018

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Most sun-tracking systems of solar concentrators are expensive, sensitive to operational costs, and complicated in optical design in which the receiver must be free to rotate about the axis. To overcome the aforementioned problems, this study presents a fixed-focus Fresnel lens solar concentrator (FFFSC) using polar-axis tracking which allows the Fresnel lens to concentrate sunlight to a fixed small heat-receiving area and the receiver remained fixed in location and rotation. Experimental research has been conducted to obtain the optical characteristics of the FFFSC for different solar times, tracking errors, and periodical adjustment errors. It has been found that maximum values of the relative optical efficiency loss (η re-opt,loss) and minimum value of the optical efficiency (η opt) of the FFFSC for different solar times are 1.87% and 71.61%, respectively. The mean value and maximum value of the local concentration ratio of the solar flux on the receiver are more than 86.64 and 1319.43, respectively. When the tracking error and periodical adjustment error are within 1 • , the η opt of the FFFSC can reach 70.38% and 68.94%, respectively. The optical characteristics of FFFSC is also verified numerically. Especially, according to the total year simulation of the FFFSC's optical characteristics, maximum value of η re-opt,loss is 0.116%, which means the proposed the FFFSC can achieve fixed-focus.

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Experimental investigation of a multi-stage humidification-dehumidification desalination system heated directly by a cylindrical Fresnel lens solar concentrator

Cited by 93 publications

References 14 publications

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

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

Desalination process using humidification–dehumidification technique: A detailed review

Simulation and Experimental Study on the Optical Performance of a Fixed-Focus Fresnel Lens Solar Concentrator Using Polar-Axis Tracking

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