Experimental investigation of heat recovery in a humidification-dehumidification desalination system via a heat pump

Shafii, Mohammad Behshad; Jafargholi, Hamed; Faegh, Meysam

doi:10.1016/j.desal.2018.03.004

Cited by 98 publications

(10 citation statements)

References 38 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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“…The results reported that the greatest system productivity was 82.12 kg/h and the highest GOR was 5.14. Shafii et al 31 tested experimentally a hybrid HDH water desalination system combined with a HP. It was noticed that, the maximum fresh water productivity and GOR obtained were 2.79 kg/h and 2.08, respectively.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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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 world economy has developed rapidly, the scale of industrial activities has continued to increase, and the population has accelerated, resulting in global water shortages [1]. By consuming the least amount of energy to produce freshwater, desalination systems can play a significant role in areas where water resources are scarce.…”

Section: Introductionmentioning

confidence: 99%

“…Traditional desalination methods include MED (multi-effect distillation), MSF (multi-stage flash evaporation), VC (vapor compression), RO (reverse osmosis), ED (electrodialysis) [1], solar distillation [2], and nanofiltration, which usually require high construction costs and large amounts of fossil fuels [1]. HDH (humidification-dehumidification) desalination technology is a promising option to ensure the safe supply of freshwater in regions with scarce water resources [3].…”

Section: Introductionmentioning

confidence: 99%

Design and Experimental Study on a New Closed-Cycle Desalination System Based On Ambient Temperature

Liu

Sun²,

Yv³

et al. 2020

Processes

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The use of seawater desalination technology to solve water shortages in energy- and resource-scarce regions has attracted widespread attention worldwide. In this paper, the performance of a closed-cycle humidification–dehumidification desalination system with a heat pump was experimentally investigated. The system is a closed-cycle system, which includes humidifiers, a heat pump, dehumidifiers, and an air heat exchanger. The heat pump is used by the system to carry energy. The effects of different parameters on the system performance were studied. Scale and economic analyses of the system were conducted to explore the application prospects of the system. The maximum gained output ratio of the system was 4.82. The maximum freshwater production was 960 kg/h, and the cost per kilogram of freshwater was USD 0.03, which are more considerable compared with other systems. This system provides an effective way to save energy in remote areas with energy shortages and freshwater resource shortages.

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Experimental investigation of heat recovery in a humidification-dehumidification desalination system via a heat pump

Cited by 98 publications

References 38 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

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

Design and Experimental Study on a New Closed-Cycle Desalination System Based On Ambient Temperature

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