Humidification–dehumidification desalination system driven by geothermal energy

Mohamed, A.M.I.; Elminshawy, Nabil A.S.

doi:10.1016/j.desal.2008.12.053

Cited by 71 publications

(12 citation statements)

References 17 publications

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“…It is greater than SECideal as given by Equation (5). Differentiation of Equation (11) shows that the minimum SECsideal = 2Posm occurs at r = 0.5.…”

Section: Figurementioning

confidence: 98%

“…The separator ensured that just distilled steam-flashed from the hot brine from the production well-circulated in the steam turbine; while the non-evaporated water fed the MSF unit. More recently, Bourouni et al [4], and subsequently Mohamed and El Minshawy [5], conducted theoretical and experimental studies on desalting water using humidification-dehumidification processes in Tunisia and Egypt respectively. Mahmoudi et al [6] proposed a new brackish water greenhouse desalination unit powered by geothermal energy for the development of arid and relatively cold regions, using Algeria as a case study.…”

Section: Introductionmentioning

confidence: 99%

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Self-Powered Desalination of Geothermal Saline Groundwater: Technical Feasibility

Davies

Orfi

2014

Water

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This theoretical study shows the technical feasibility of self-powered geothermal desalination of groundwater sources at <100 °C. A general method and framework are developed and then applied to specific case studies. First, the analysis considers an ideal limit to performance based on exergy analysis using generalised idealised assumptions. This thermodynamic limit applies to any type of process technology. Then, the analysis focuses specifically on the Organic Rankine Cycle (ORC) driving Reverse Osmosis (RO), as these are among the most mature and efficient applicable technologies. Important dimensionless parameters are calculated for the ideal case of the self-powered arrangement and semi-ideal case where only essential losses dependent on the RO system configuration are considered. These parameters are used to compare the performance of desalination systems using ORC-RO under ideal, semi-ideal and real assumptions for four case studies relating to geothermal sources located in India, Saudi Arabia, Tunisia and Turkey. The overall system recovery ratio (the key performance measure for the self-powered process) depends strongly on the geothermal source temperature. It can be as high as 91.5% for a hot spring emerging at 96 °C with a salinity of 1830 mg/kg. OPEN ACCESSWater 2014, 6 3410

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“…It is greater than SECideal as given by Equation (5). Differentiation of Equation (11) shows that the minimum SECsideal = 2Posm occurs at r = 0.5.…”

Section: Figurementioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Self-Powered Desalination of Geothermal Saline Groundwater: Technical Feasibility

Davies

Orfi

2014

Water

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“…A later study [14] constructed a large-scale pilot system with a 100 m 2 solar air heater field and demonstrated 1200 L/day fresh water production at an average solar radiation intensity of 550 W/m 2 . Past studies [15] also successfully demonstrated utilization of geothermal energy for heat input.…”

Section: Introductionmentioning

confidence: 95%

A highly effective multi-string humidifier with a low gas stream pressure drop for desalination

Zeng

Sadeghpour

2019

Desalination

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The humidification-dehumidification (HDH) process is appealing for small-scale distributed desalination of highsalinity water. We report a new design of compact lightweight humidifiers with high effectiveness and low electric energy consumption for HDH systems. The new design consists of a dense array of vertically aligned strings, along which thin films of a heated liquid feed are allowed to flow under gravity. A counterflowing gas stream makes direct contact with liquid films carrying the generated water vapor to a dehumidifier. The unique geometric configuration of our design affords high interface-to-volume ratios necessary for high heat/mass exchange effectiveness and straight contiguous gas flow paths for reduced gas-phase pressure drops. We constructed a 0.4 m-tall prototype and examined the effects of the liquid flow rate, air velocity and feed liquid salinity on the heat/mass transfer performance and the gas stream axial pressure drop. Compared with previously reported pad humidifiers and spray columns, the present multi-string humidifier achieves almost 5 times the evaporation rate per humidifier volume at comparable gas stream pressure drops or an order of magnitude reduction in the gas stream pressure drop at comparable total evaporate rates. Our work demonstrates a highlyeffective but compact and lightweight multi-string humidifier with a small gas stream axial pressure drop for HDH and related applications.

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“…The renewable energy resource of geothermal energy that is utilized in the HDH water desalination systems has a number of preferences compared with the conventional energy system. It has a number of benefits such as convenience for low‐temperature seawater desalination systems, no impact on the environment, stability in heat supply, effective cost, long lifetime, and the possibility of simultaneous electricity generation 42,78,79 . Most of the desalination thermal processes are conducted at relatively low temperatures; therefore, the geothermal energy WDS is suitable for the HDH desalination technology 79 .…”

Section: Classifications Of Hdh Systemsmentioning

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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Humidification–dehumidification desalination system driven by geothermal energy

Cited by 71 publications

References 17 publications

Self-Powered Desalination of Geothermal Saline Groundwater: Technical Feasibility

Self-Powered Desalination of Geothermal Saline Groundwater: Technical Feasibility

A highly effective multi-string humidifier with a low gas stream pressure drop for desalination

Desalination process using humidification–dehumidification technique: A detailed review

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