Impact of condenser heat transfer on energy and exergy performance of active single slope solar still under hot climate conditions

Hassan, Hamdy; Yousef, Mohamed; Fathy, M. E.; Ahmed, Mahmoud

doi:10.1016/j.solener.2020.04.026

Cited by 71 publications

(17 citation statements)

References 59 publications

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“…Energy efficiency gives a quantitative evaluation of the incoming and effective solar energy used by the NCLSS. While the exergy efficiency represents a qualitative view to evaluate the maximum productivity that can be produced by the still under certain weather conditions 53 . The energy efficiency of the NCLSS (

{\eta }_{{En}}

) is estimated based on the hourly distillate yield ( ṁ dh ), the latent heat of evaporation ( h fg ), and the total amount of solar radiation ( I o ) received by the still area ( A b ), as expressed by the following formula 54 :

{\eta }_{En}=\frac{{\dot{m}}_{dh}\times {h}_{fg}}{{I}_{o}\times {A}_{b}}.

…”

Section: Resultsmentioning

confidence: 99%

“…While the exergy efficiency represents a qualitative view to evaluate the maximum productivity that can be produced by the still under certain weather conditions. 53 The energy efficiency of the NCLSS (η En ) is estimated based on the hourly distillate yield (ṁ dh ), the latent heat of evaporation (h fg ), and the total amount of solar radiation (I o ) received by the still area (A b ), as expressed by the following formula 54 :…”

Section: Energy and Exergy Efficiencymentioning

confidence: 99%

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Effect of condenser design on the performance of the natural circulation loop solar still: An experimental study

Rahmani

Zaidi

2022

Heat Trans

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This paper deals with an experimental study performed to evaluate the condenser geometry effect on the natural circulation loop solar still (NCLSS) performance. Three configurations for the external condenser, namely smooth single-tube condenser, finned-tube condenser, and three-tube condenser, were tested under typical summer conditions. The experimental data show that the obtained daily productivity of the NCLSS for the three condenser designs was 2.057, 2.628, and 3.3 kg/m 2 , respectively. The comparison shows that adding external annular fins to the smooth single-tube condenser increases the still's daily productivity by about 27%. The increase in both internal and external areas of the condenser increases the freshwater daily productivity by 60.42% than the smooth single-tube design and by 25.57% than the finned-tube design. The calculations show that the daily thermal efficiency of the NCLSS was 16%, 20.8%, and 25.38% for the three test days, respectively. While, the daily exergy efficiency for the three condenser designs was 1.78%, 2.12%, and 2.22%, respectively.

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{\eta }_{{En}}

{\eta }_{En}=\frac{{\dot{m}}_{dh}\times {h}_{fg}}{{I}_{o}\times {A}_{b}}.

…”

Section: Resultsmentioning

confidence: 99%

Section: Energy and Exergy Efficiencymentioning

confidence: 99%

Effect of condenser design on the performance of the natural circulation loop solar still: An experimental study

Rahmani

Zaidi

2022

Heat Trans

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“…The general mass balance equation of SAH is written as (Akpinar and Koçyiĝit 2010;Hassan et al 2020e) (Hassan et al 2020c):…”

Section: Exergymentioning

confidence: 99%

Energy and exergy assessment of new designed solar air heater of V-shaped transverse finned absorber at single- and double-pass flow conditions

Abo-Elfadl

El-Dosoky

Hassan

2021

Environ Sci Pollut Res

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Flat plate solar collector is one of the main solar collectors that has a simple structure, reliable operation, large heat preoccupation area, and low cost. Its drawback is the low heat transfer between the working air and the absorber plate. A solar air heater of Vshaped transverse finned absorber having new designed absorber plate of lateral gaps and central holes to enhance its performance is investigated experimentally at single-pass and double-pass airflow conditions. Moreover, the energy and exergy assessment of its performance was studied and compared with traditional longitudinal finned heater having the same fin surface area and construction except for the absorber plate design. The study is investigated at air mass flow rates of 0.025, 0.05, and 0.075 kg/s. Findings show that the new heater achieves maximum outlet temperature rising of 28.2 °C at 0.025 kg/s and doublepass flow. Moreover, it has an average daily energy efficiency of 88.5%, 81.88%, and 61.3% at mass flow rates of 0.075, 0.05, and 0.025 kg/s with increments of 9.4%, 13.3%, and 9.66%, respectively, compared to the longitudinal finned heater. Additionally, it achieves exergy efficiencies of 2.5%, 2.1%, and 1.7% at mass flow rates of 0.025, 0.05, and 0.075 kg/s with increments 18%, 25.7%, and 18.2%, respectively, relative to longitudinal finned heater. Furthermore, the new heater design possesses greater energy efficiency comparing to former studied SAH designs.

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“…A parabolic trough collector (PTC) was built into a SS with forced air and water cooling to enhance the condensation (Hassan et al 2020). The PTC and SS were linked through a heat exchanger to transfer heat.…”

Section: Continuous Experiments From 2 To 3 Monthsmentioning

confidence: 99%

Effects of solar geometry and operation period on stability of solar desalination systems: a review

Arunkumar

Raj

Kabeel

et al. 2021

Environ Sci Pollut Res

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The sun is the primary source of life on the earth. The heating effect of the sun provides a more fruitful environment for mankind. In addition, solar energy in the form of thermal radiation has been utilized for solar thermal applications and space heating. With abundant solar radiation, the emergence of the solar desalination has been emerged as a viable solution for water purification by utilizing solar stills. However, solar-powered distillation is relatively a slow process due to the requirement of bulk heating. To suppress thermal conduction to bulk water, various photothermal materials were employed. However, there are many governing parameters which influence the productivity, including solar intensity, cloud, wind, ambient air temperature, humidity, solar absorption of blackened surface, depth of bulk water, feed water type, angle of condensation surface, water film thickness, underneath the condensing surface, and experiment period. Further, systematic and continuous experiments for extended periods are essential for determining the stability and durability of a solar desalination system. The main objective of this article is to review all the experimental studies conducted for two months at minimum up to 1-year duration. In addition, all the SDSs handled in this study further were examined by solar geometrical factors, including day length (DL) and position of the sun or zenith angle (θ z ). As a result, the sunshine hours, day length, and the solar zenith angle play an important role in the water evaporation rate. Lower solar zenith angle and longer day length (more sunshine hours) are desirable for higher water productivity.

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Impact of condenser heat transfer on energy and exergy performance of active single slope solar still under hot climate conditions

Cited by 71 publications

References 59 publications

Effect of condenser design on the performance of the natural circulation loop solar still: An experimental study

Effect of condenser design on the performance of the natural circulation loop solar still: An experimental study

Energy and exergy assessment of new designed solar air heater of V-shaped transverse finned absorber at single- and double-pass flow conditions

Effects of solar geometry and operation period on stability of solar desalination systems: a review

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