Performance analysis of proposed solar HDH water desalination systems for hot and humid climate cities

Summary A study of the performance enhancement of a humidification‐dehumidification (HDH) system integrated with multiple evaporators/condensers heat pump (HP) and heat recovery units is presented. The HP unit is intended to deliver necessary heating for humidifier and heating/cooling for dehumidifier in a new strategy. The proposed integrated system is capable to produce fresh water from the HDH system and HP unit. Four different configurations of the system formed by excluding/adding condensers and evaporators were investigated; mode‐A (seawater precooling and reheating), mode‐B (seawater reheating), mode‐C (seawater precooling and humid air reheating), and mode‐D (humid air reheating). Fresh water productivity, fresh water ratio, system water recovery, gain output ratio, specific work consumption, and fresh water production cost were used as performance measuring parameters of the system. The influences of operating parameters on the system performance were analytically studied and experimentally validated for different system configurations. The results indicate the enhancement of the systems' performance with increasing ambient air temperature and humidity, seawater and air flow rates, and with decreasing seawater temperature. The system configuration of mode‐B shows the best performance with fresh water production of 61.94 kg/h and gain output ratio of 4.97 which are higher than those of the other configurations by 13%, 55%, 85% and 11%, 48%, and 75%, respectively. Comparisons of the proposed configurations with the other HDH desalination systems available in the literature were presented and better performance of the proposed systems was noticed.

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“…The dehumidifier effectiveness as presented by Fouda et al 15 and Lawal et al 28 is

ε_{deh} = \max ((),, \frac{((), h_{normala 2} - h_{normala 4})}{((), h_{normala 2} - h_{normala 4, ideal})}, \frac{((), h_{w 4} - h_{w 3})}{((), h_{w 4, ideal} - h_{w 3})})

…”

Section: Mathematical Modelmentioning

confidence: 99%

“…Recently, several solar assisted HDH water desalination systems were developed to improve the zero‐energy enhancement of the system 15‐17 . Shalaby et al 18 developed a mathematical model for the thermal analysis of the HDH solar water desalination systems.…”

Section: Introductionmentioning

confidence: 99%

Humidification‐dehumidification water desalination system integrated with multiple evaporators/condensers heat pump unit

et al. 2020

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“…Open air, closed water, and air heated (OACW‐AH) system 110 [Colour figure can be viewed at wileyonlinelibrary.com]…”

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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“…The average productivity of the proposed unit was found to be 22 L/day, and the mean GOR was approximately 2. More recently, several systems configurations of solar HDH systems were studied and compared to find the optimum configuration that gives optimum system performance 25,26 . Some of these systems combined VC refrigeration cycle with HDH and solar thermal systems to improve the productivities of the systems 26 …”

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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Performance analysis of proposed solar HDH water desalination systems for hot and humid climate cities

Cited by 74 publications

References 43 publications

Humidification‐dehumidification water desalination system integrated with multiple evaporators/condensers heat pump unit

Humidification‐dehumidification water desalination system integrated with multiple evaporators/condensers heat pump unit

Desalination process using humidification–dehumidification technique: A detailed review

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

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