Examination of a solar desalination system equipped with an air bubble column humidifier, evacuated tube collectors and thermosyphon heat pipes

Behnam, Pooria; Shafii, Mohammad Behshad

doi:10.1016/j.desal.2016.06.016

Cited by 99 publications

(28 citation statements)

References 36 publications

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“…There are various types of desalination systems including Reverse-Osmosis (RO), humidificationdehumidification (HDH) and etc [43,44]. Behnam et al [45] experimentally investigated a thermosyphon-assisted HDH desalination. The desalination system consisted of air humidifier, thermosyphon, dehumidifier, and evacuated tube collector.…”

Section: Solar Desalinationmentioning

confidence: 99%

A review on the solar applications of thermosyphons

Ramezanizadeh¹,

Nazari²,

Ahmadi³

et al. 2018

MMEP

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Thermosyphons are used in various energy systems due to their efficient performance in heat transfer. These devices can be employed in several solar energy systems because of their high effective thermal conductivity. The most important solar applications can be listed as PV cooling, desalination units, water heating systems and thermoelectric. In the current study, the mentioned applications and the key findings of the related researches are reviewed and represented. Based on the reviewed publications, the thermal specifications of the thermosyphons affect the overall performance of the systems assisted with thermosyphons. For instance, by using nanofluids, the thermal performance of these devices improves which results in higher efficiency of the systems. Using novel ideas such as using wick in the evaporator section is another approach to achieve more proper performance of the thermosyphons in solar energy systems.

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Section: Solar Desalinationmentioning

confidence: 99%

A review on the solar applications of thermosyphons

Ramezanizadeh¹,

Nazari²,

Ahmadi³

et al. 2018

MMEP

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“…On the other hand, for experiments conducted by Liu and Sharqawy [ 24 ], a decrease in the humidifier efficiency is measured with increasing superficial air velocity. Furthermore, Behnam and Shafii [ 25 ] noticed a negative impact of the superficial air velocity on system productivity for the morning hours, yet a positive impact in the afternoon. This impact is reasonable, as it needs to be taken into account that the heat for their system was provided by evacuated tube collectors with heat pipes and was therefore dependent on the solar irradiation.…”

Section: Introductionmentioning

confidence: 99%

Experimental analysis of the humidification of air in bubble columns for thermal water treatment systems

Eder

Preißinger

2020

Experimental Thermal and Fluid Science

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The humidification-dehumidification process (HDH) for desalination is a promising technology to address water scarcity issues in rural regions. However, a low humidifier efficiency is a weakness of the process. Bubble column humidifiers (BCH) are promising for HDH, as they provide enhanced heat and mass transfer and have low maintenance requirements. Previous studies of HDH-systems with BCHs draw different conclusions regarding the impact of superficial air velocity and liquid height on the humidification. Furthermore, the impact of flow characteristics has never been investigated systematically at all. In this study, an optimized BCH test setup that allows for optical analysis of the humidifier is used and evaluated. Our test setup is validated, since the influence of water temperature on the humidification, which is exponential, is reproduced. Measurements with seawater show that the normalised system productivity is increased by about 56% with an increase in superficial air velocity from 0.5 cm/s to 5 cm/s. Furthermore, the system productivity is increased by around 29% with an increase in liquid height from 60 mm to 378 mm. While the impact of superficial air velocity can be traced back to temperature changes at the humidifier and dehumidifier outlets, the impact of liquid height is shown to be caused by a smaller heat loss surface in the humidifier with an increase in liquid height. For the impact of sieve plate orifice diameter, a clear influence on the humidification is not apparent, this parameter needs to be investigated further. Finally, our new test setup allows for analysing the humidification of air (1) in a systematic way, (2) in relevant measurement ranges and (3) in comparison with optical analyses of the flow characteristics.

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“…Because of their great heat transfer capability, the application of heat pipes has been widely studied. The importance of heat pipes as devices for effective heat transfer has led to the development of various types such as loop heat pipes [17], wick type heat pipes [16][17], thermosyphon heat pipes [18], switchable heat pipes [16], pulsating heat pipes [19], variable conductance heat pipes [20]. THP also called two-phase close thermosyphon, is a gravity-assisted wickless heat pipe, using the evaporation and condensation of the inner working fluid to transfer heat.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of the increasing thermal efficiency of an indirect water bath heater by use of thermosyphon heat pipe

et al. 2020

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Natural gas must be preheated prior to pressure reduction in city gate stations (CGSs). Indirect water bath heaters are employed in CGSs for preheating, consume a considerable amount of natural gas for the process. This type of heater has a low efficiency therefore a significant amount of energy is wasted. Due to the high capacity of thermosyphon heat pipe (THP), its utilization in CGS heater were investigated experimentally in this paper. For this purpose, a heater setup was manufactured and its thermal efficiency was calculated. THPs were then designed, manufactured, and utilized between the fire tube and the gas tube. Further the type of working fluid and the range of filling ratio (FR) were discussed and the most effective state was suggested. Moreover, the thermal efficiency of the heater in the presence of THPs was investigated. The obtained results showed that the thermal efficiency of the heater improved up to 13% with the addition of THPs. The most effective state of THPs was associated with the water as working fluid with 20% FR in the front route and methanol as working fluid with 30% FR in the back route of the fire tube.

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Examination of a solar desalination system equipped with an air bubble column humidifier, evacuated tube collectors and thermosyphon heat pipes

Cited by 99 publications

References 36 publications

A review on the solar applications of thermosyphons

A review on the solar applications of thermosyphons

Experimental analysis of the humidification of air in bubble columns for thermal water treatment systems

Experimental investigation of the increasing thermal efficiency of an indirect water bath heater by use of thermosyphon heat pipe

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