Energy and exergy analysis of a thermosiphon and forced-circulation flat-plate solar collector using MWCNT/Water nanofluid

Eltaweel, Mahmoud; Abdel‐Rehim, Ahmed A.

doi:10.1016/j.csite.2019.100416

Cited by 95 publications

(36 citation statements)

References 25 publications

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“…It has been found that the solar water freshener's productivity is about 3.95, 3.6, and 4.25 L per day for the double‐slope solar water freshener, single‐slope solar water freshener, and pyramid solar water freshener, respectively . Other researchers of the passive solar water fresheners have used various materials and/or porous environments with saline water in the solar water freshener's pan for increasing the performance of the device . Some other studies have succeeded in enhancing the performance of the solar water freshener device using adsorbents .…”

Section: Introductionmentioning

confidence: 99%

Experimental evaluation of solar still efficiencies as a basic step in treatment of wastewater

Taherizadeh

Farahbod

Ilkhani

2019

Heat Trans. Asian Res.

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The present study investigates a unit for making use of freshwater in a kiln in a practical manner. At first, in this unit, the saline wastewater flowing out of the MED unit in Mobin Petrochemical Complex enters a gravitational bed and is subjected to preliminary treatment. In the next stage, the same saline wastewater enters the first pretreatment reactor for undergoing a coagulation procedure; then, it enters a second biological reactor for undergoing both coagulation and biological treatment. Afterwards, the output current of the biological reactor enters a solar pond for the separation of the dissolved salt in the wastewater, for which, it enters an antiseptic system that uses ultraviolet (UV) for treatment. Finally, the saline wastewater is transformed into a soft treated current. In the present study, the performance of a solar condensation unit installed on the path of the output wastewater of the UV antiseptic unit has been examined. In this study, the thermal output, conduction output, and freshwater production output have been altogether subjected to practical evaluation.The results offered herein are indicative of the relative error rates equal to about 7.2% and 4.9% for thermal output of day and night, respectively. Moreover, the conduction efficiency relative errors have been about 7% and 5.6% for day and night, respectively. In addition, on average, the relative cumulative error of the thermal energy storage substrate's output was about 3.5% per day over a month. K E Y W O R D Sconduction efficiency, production rate, solar-powered desalination unit, thermal output, wastewater treatment

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Section: Introductionmentioning

confidence: 99%

Experimental evaluation of solar still efficiencies as a basic step in treatment of wastewater

Taherizadeh

Farahbod

Ilkhani

2019

Heat Trans. Asian Res.

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“…Higher increasing rate in the mass flow rate can be observed for water relative to MWCNT/water nanofluid for the same temperature difference. This can be explained by the higher viscosity of MWCNT/water nanofluid compared to water, which results in a lower velocity in the collector as explained by the authors . This reduction in the velocity becomes very clear with twisted tubes where the resistance is higher, or the pressure drop is higher.…”

Section: Resultsmentioning

confidence: 79%

“…This can be explained by the higher viscosity of MWCNT/water nanofluid compared to water, which results in a lower velocity in the collector as explained by the authors. 30 This reduction in the velocity becomes very clear with twisted tubes where the resistance is higher, or the pressure drop is higher. The figure shows also that the twisted tubes-based design is superior on the normal tubes where more temperature differences are obtained even with lower flow rates.…”

Section: Resultsmentioning

confidence: 99%

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Indirect thermosiphon flat‐plate solar collector performance based on twisted tube design heat exchanger filled with nanofluid

2020

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Summary Stationary solar collector such as flat‐plate collector is a thermal device, which traps solar energy and converts it into heat that can be used in industrial and domestic applications such as water heating. Flat‐plate collector thermal performance enhancement is investigated in this research paper. Two cross‐sectional geometries of the tube in the heat exchanger were investigated; a normal circular tube and a twisted tube were used in the experiment. The aim of the twisted tube exchanger is to enhance the performance of heat transfer of the tubes and to reduce the shell pressure drop; flat‐plate solar collector is the used application to study the heat exchanger performance. Both twisted tubes heat exchanger and normal circular tubes heat exchanger were examined in the same location and conditions with the same solar collector, both were used in the heat exchanger to study their effect, with two different working fluids, which are distilled water and multiwalled carbon nanotube (MWCNT)/water nanofluid. The system shows an increase in the performance when twisted tubes were used in the system compared with the circular tubes in both distilled water and MWCNT/water nanofluid by 12.8% and 12.5%, respectively, with an improvement by 34% for twisted tubes with MWCNT compared with normal circular tubes with distilled water.

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“…By the end of 2016, evacuated tube collectors accounted for 13.7% of the total water collectors' area in Europe [1]. Flat plate solar collectors are the cheapest and have a simple design, but the problem is that they have a low thermal efficiency and low outlet temperature [2]. Evacuated tube solar collectors have higher efficiency at higher temperatures (above 80 °C) and cold climates, compared to flat plate ones [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigations of Energy and Exergy Efficiencies of an Evacuated Tube Solar Collector

Siuta-Olcha

Cholewa

Dopieralska-Howoruszko

2019

Innovations-Sustainability-Modernity-Openness Conference (ISMO’19)

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The main purpose of the analysis is to determine the influence of the weather and operating conditions on the energy and exergy efficiencies of an evacuated tube solar collector, heat pipe type with a mixture of water and propylene glycol (50%/50%) as a working fluid under the Polish climate conditions (the geographical coordinates for Lublin: Latitude 51°15′ N and longitude 22°34′ E), according to the experimental data. The solar collector with an aperture area of 3.6 m2 is a main component of the solar hot water test installation located in the laboratory of the Faculty of Environmental Engineering, Lublin University of Technology. Studies have been presented for August. Based on the results, the average daily energy efficiency of the solar collector at the level of 34% (14.3–58.8%) and the average daily exergy efficiency of the solar collector at the level of 2.25% (0.86–3.75%) were established.

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Energy and exergy analysis of a thermosiphon and forced-circulation flat-plate solar collector using MWCNT/Water nanofluid

Cited by 95 publications

References 25 publications

Experimental evaluation of solar still efficiencies as a basic step in treatment of wastewater

Experimental evaluation of solar still efficiencies as a basic step in treatment of wastewater

Indirect thermosiphon flat‐plate solar collector performance based on twisted tube design heat exchanger filled with nanofluid

Experimental Investigations of Energy and Exergy Efficiencies of an Evacuated Tube Solar Collector

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