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Article
Publication date: 3 October 2016

Fahim Ullah, Min Kang, Lubna Hassan, Ninghui Li, Jun Yang, Xingsheng Wang and Mansoor Khan Khattak

The purpose of the study was to develop a performance flat-plate solar collector that would be used as a solar drier for fruit fig (Ficus carica L). This study proposes…

Abstract

Purpose

The purpose of the study was to develop a performance flat-plate solar collector that would be used as a solar drier for fruit fig (Ficus carica L). This study proposes how and why solar energy is important for drying the agricultural products. This study aims to expand the domain of solar collector for different purposes and, most important, for agricultural resource normally found in the literature.

Design/methodology/approach

The paper opted for an exploratory study using the flat-plate solar collector with drying chamber for drying purposes of agricultural products. During the experiment, the data were collected with moisture content, drying rate of the product and solar irradiation falls on the collector.

Findings

This paper describes that how flat-plate collector works for agricultural products and how to reduce the moisture content in the product (fig). Efficiency of collector was evaluated under the ambient temperatures of 24°C. Efficiency also significantly increased from 53 to 55 per cent with an increase in ambient temperature from 22 to 24 °C. Figs (Ficus carica L) were dried in the drying chamber of the flat-plate solar collector. The products were dried at temperature of 55-65°C and 15 to 20 per cent humidity.

Research limitations/implications

Because of this research chosen, the research results are beneficiary for agricultural users for drying purposes. Therefore, the researchers are encouraged to dry the agricultural product with flat-plate solar collector, because it reduced the moisture content of the product very fast.

Originality/value

This paper fulfills an identified need to study that how flat-plat solar collector can be used.

Details

World Journal of Engineering, vol. 13 no. 5
Type: Research Article
ISSN: 1708-5284

Keywords

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Article
Publication date: 1 August 2005

M.A. Alghoul, M.Y. Sulaiman, B.Z. Azmi and M.Abd. Wahab

To cover the main contributions and developments in solar thermal collectors through focusing on materials, heat transfer characteristics and manufacturing challenges.

Abstract

Purpose

To cover the main contributions and developments in solar thermal collectors through focusing on materials, heat transfer characteristics and manufacturing challenges.

Design/methodology/approach

A range of published papers and internet research including research work on various solar thermal collectors (flat plate, evacuated tubes, and heat pipe tube) were used. Evaluation of solar collectors performance is critiqued to aid solar technologies make the transition into a specific dominant solar collector. The sources are sorted into sections: finding an academic job, general advice, teaching, research and publishing, tenure and organizations.

Findings

Provides information about types of solar thermal collectors, indicating what can be added by using evacuated tube collectors instead of flat plate collectors and what can be added by using heat pipe collectors instead of evacuated tubes.

Research limitations/implications

Focusing only on three types of solar thermal collectors (flat plate, evacuated tubes, and heat pipe tube).

Practical implications

Useful source of information for consultancy and impartial advice for graduate students planning to do research in solar thermal technologies.

Originality/value

This paper fulfils identified information about materials and heat transfer properties of materials and manufacturing challenges of these three solar thermal collectors.

Details

Anti-Corrosion Methods and Materials, vol. 52 no. 4
Type: Research Article
ISSN: 0003-5599

Keywords

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Article
Publication date: 5 October 2015

N. H. Waziri, A.M. Usman and J. S. Enaburekhan

– The purpose of this paper is to determine the optimum temperature and solar radiation periods from November 2008 to April 2009.

Abstract

Purpose

The purpose of this paper is to determine the optimum temperature and solar radiation periods from November 2008 to April 2009.

Design/methodology/approach

Four flat plate collectors were constructed and inclined at an angle ß = 0o, Φ°, (Φ + 15)o and (Φ − 15)° tilt angles where Φ is the latitude of the location (12.1o). The tests were conducted for a period of six months spanning from November 2008 to April 2009. Readings were taken for solar radiation, absorber surface temperature and ambient temperature from 10 a.m. to 3 p.m. on an hourly basis. The amount of solar energy in W/m2 for Kano metropolis, which lies on latitude 12.1°, was determined experimentally.

Findings

It was observed that the maximum temperature was 100°C, and it falls in April at the 12.1° tilt angle followed by 99.9°C and 99.8°C at –2.9° and 0°, respectively, within same month. April is the optimum period having the highest temperature. The maximum solar radiation for the six months recorded was 1070.4 W/m2 and fell on 4th and 8th of February at the 27.1° tilt angle and the highest mean monthly solar radiation was 953.7593W/m2 in November at the 27.1° tilt angle followed by 895.7321 and 888.6286W/m2 in February at the 27.1° and 12.1° tilt angle, respectively.

Research limitations/implications

The research is limited to six-month periods and Kano metropolis.

Originality/value

The research was carried out in the Department of Mechanical Engineering Bayero University Kano, Nigeria.

Details

Journal of Engineering, Design and Technology, vol. 13 no. 4
Type: Research Article
ISSN: 1726-0531

Keywords

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Article
Publication date: 12 February 2018

Ranga Babu J.A., Kiran Kumar K. and Srinivasa Rao S.

This paper aims to present an analytical investigation of energy and exergy performance on a solar flat plate collector (SFPC) with Cu-CuO/water hybrid nanofluid, Cu/water…

Abstract

Purpose

This paper aims to present an analytical investigation of energy and exergy performance on a solar flat plate collector (SFPC) with Cu-CuO/water hybrid nanofluid, Cu/water and CuO/water nanofluids as collector running fluids.

Design/methodology/approach

Heat transfer characteristics, pressure drop and energy and exergy efficiencies of SFPC working on these nanofluids are investigated and compared. In this study, a comparison is made by varying the mass flow rates and nanoparticle volume concentration. Thermophysical properties of hybrid nanofluids are estimated using distinctive correlations available in the open literature. Then, the influence of these properties on energy and exergy efficiencies of SFPC is discussed in detail.

Findings

Energy analysis reveals that by introducing the hybrid nanoparticles in water, the thermal conductivity of the working fluid is enhanced by 17.52 per cent and that of the individual constituents is enhanced by 15.72 and 15.35 per cent for Cu/water and CuO/water nanofluids, respectively. This resulted in 2.16 per cent improvement in useful heat gain for hybrid nanofluid and 1.03 and 0.91 per cent improvement in heat gain for Cu/water and CuO/water nanofluids, respectively. In line with the above, the collector efficiency increased by 2.175 per cent for the hybrid nanofluid and 0.93 and 1.05 per cent enhancement for Cu/water and CuO/water nanofluids, respectively. Exergy analysis elucidates that by using the hybrid nanofluid, exergy efficiency is increased by 2.59 per cent, whereas it is 2.32 and 2.18 per cent enhancement for Cu/water and CuO/water nanofluids, respectively. Entropy generation is reduced by 3.31, 2.35 and 2.96 per cent for Cu-CuO/water, Cu/water and CuO/water nanofluids, respectively, as compared to water.

Research limitations/implications

However, this is associated with a penalty of increment in pressure drop of 2.92, 3.09 and 2.74 per cent for Cu-CuO/water, Cu/water and CuO/water nanofluids, respectively, compared with water.

Originality/value

It is clear from the analysis that Cu-CuO/water hybrid nanofluids possess notable increment in both energy and exergy efficiencies to use them in SFPCs.

Details

World Journal of Engineering, vol. 15 no. 1
Type: Research Article
ISSN: 1708-5284

Keywords

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Article
Publication date: 11 October 2018

Soroush Sadripour

In this study, the effects of using corrugated absorber plate (instead of flat plate) and also using aerosol/carbon-black nanofluid (instead of air) on heat transfer and…

Abstract

Purpose

In this study, the effects of using corrugated absorber plate (instead of flat plate) and also using aerosol/carbon-black nanofluid (instead of air) on heat transfer and turbulent flow characteristics in solar collectors were numerically investigated.

Design/methodology/approach

The 3D continuity, momentum and energy equation were solved by finite volume and SIMPLE algorithm. As a result, the corrugated absorber plate was inspected in the case of triangle, rectangle and sinuous with the wave length of 1 mm and wave amplitude of 3 mm in turbulent flow regime and Reynolds number between 2,500 and 4,000. Choosing the proper geometry was carried out based on the best performance evaluation criteria (PEC) and increasing the air temperature from collector inlet to outlet.

Findings

The results revealed that for all times of the year the highest PEC was obtained for corrugated Sinusoidal model; however, the highest temperature increase from inlet to outlet was obtained for rectangular corrugated model. In addition, the results indicated that in sinusoidal model, the nanoparticles volume fractions increase leads to heat performance coefficient increase and the best heat performance conditions were attained in volume fraction of 0.1 per cent and Reynolds number of 4,000 for both six months period. In model with rectangular corrugated plate, usage of nanofluid in all range of Reynolds numbers leads to reduction of outlet temperature.

Originality/value

The effect of some nanoparticles on heat transfer using thermal– hydraulic performances in heat exchangers has been assessed, but the effects of atmospheric aerosol-based nanofluid using carbon-black nanoparticles (CBNPs) on the heat transfer in corrugated heat sink solar collectors by 3D numerical modeling has not been yet investigated. In present study, usage of CBNPs with different volume fractions in range of 0 to 0.1 per cent in turbulent regime of fluid flow is analyzed. Furthermore, in this paper, besides the effects of using CBNPs, a solar absorber located in Shiraz, as one of the best solar irradiation receiver cities in Iran is evaluated.

Details

International Journal of Numerical Methods for Heat & Fluid Flow, vol. 29 no. 4
Type: Research Article
ISSN: 0961-5539

Keywords

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Article
Publication date: 10 August 2010

Mohamed Louajari, Ahmed Ouammi and Abdelaziz Mimet

The purpose of this paper is to demonstrate the possibility of the use of a solar adsorption refrigeration machine, using the pair activated carbon/ammonia within the…

Abstract

Purpose

The purpose of this paper is to demonstrate the possibility of the use of a solar adsorption refrigeration machine, using the pair activated carbon/ammonia within the framework of sustainability and development of rural areas.

Design/methodology/approach

The limited availability of electrical grid in rural areas of Morocco makes necessary the adoption of new methods in order to provide the needs of energy services, which represent an important factor affecting the quality of life. The studies that were undertaken in this current paper investigated the sensitivity of the COP as well as the production of the cold at various refrigeration machine temperatures.

Findings

It can be recognized that the feasibility of the machine with significant production of cold in the form of ice is between 3.33 and 4.14 kg/m2 for a solar flat plate collector; and between 7.16 and 9.94 kg/m2 for solar flat plate.

Originality/value

The paper presents a model of decision‐making support for selecting the optimal conditions for the use of a solar adsorption refrigeration machine. The model optimises the quantity of cold produced and the coefficient of performance (COP) of the machine and investigates the sensitivity of the COP to the characteristic temperatures of the cycle of the machine.

Details

Management of Environmental Quality: An International Journal, vol. 21 no. 5
Type: Research Article
ISSN: 1477-7835

Keywords

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Article
Publication date: 4 August 2021

Akbar Alidadi Shamsabadi, Mehdi Jahangiri, Tayebeh Rezaei, Rouhollah Yadollahi Farsani, Ali Seryani and Siavash Hakim

In this study, a solar water heating system along with a seasonal thermal energy storage and a heat pump is designed for a villa with an area of 192 m2 in Tehran, the…

Abstract

Purpose

In this study, a solar water heating system along with a seasonal thermal energy storage and a heat pump is designed for a villa with an area of 192 m2 in Tehran, the capital of Iran.

Design/methodology/approach

According to the material and the area of the residential space, the required heating of the building was calculated manually and then the thermodynamic analysis of the system and simulation was done in MATLAB software. Finally, regarding the waste of system, an efficient solar heating system, providing all the required energy to heat the building, was obtained.

Findings

The surface area of the solar collector is equal to 46 m2, the capacity of the tank is about 2,850 m3, insulation thickness stands at 55 cm and the coefficient of performance in required heat pump is accounted to about 9.02. Also, according to the assessments, the maximum level of received energy by the collector in this system occurs at a maximum temperature of 68ºC.

Originality/value

To the best of the authors’ knowledge, in the present work, for the first time, using mathematical modeling and analyzing of the first and second laws of thermodynamics, as well as using of computational code in MATLAB software environment, the solar-assisted ground source heat pump system is simulated in a residential unit located in Tehran.

Details

Journal of Engineering, Design and Technology , vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 1726-0531

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Article
Publication date: 10 August 2015

Uroš Stritih, Halime Paksoy, Bekir Turgut, Eneja Osterman, Hunay Evliya and Vincenc Butala

Bilateral project with Slovenia and Turkey with the title thermal energy storage for efficient utilization of solar energy was the basis for this paper. The paper aims to…

Abstract

Purpose

Bilateral project with Slovenia and Turkey with the title thermal energy storage for efficient utilization of solar energy was the basis for this paper. The paper aims to discuss this issue.

Design/methodology/approach

The paper is the review of solar thermal storage technologies with examples of use in Slovenia and Turkey.

Findings

The authors have found out that compact and cost effective thermal energy storage are essential.

Research limitations/implications

Research on the field of thermal energy storage in Slovenia and Turkey is presented.

Practical implications

The paper presents solar systems in Slovenia and Turkey.

Originality/value

The paper gives information about the sustainable energy future on the basis of solar energy.

Details

Management of Environmental Quality: An International Journal, vol. 26 no. 5
Type: Research Article
ISSN: 1477-7835

Keywords

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Article
Publication date: 6 August 2019

Ab Kasaeian, Reza Daneshazarian, Fathollah Pourfayaz, Sahar Babaei, Mojgan Sheikhpour and Shima Nakhjavani

Because of its increased absorptance in fluid and reduced heat loss, direct absorption nanofluid (DANF) is receiving intense interest as an efficient way to harvest solar

Abstract

Purpose

Because of its increased absorptance in fluid and reduced heat loss, direct absorption nanofluid (DANF) is receiving intense interest as an efficient way to harvest solar energy. This work aims to investigate, for the first time, the application of DANF in parabolic trough collectors (PTC), a promising collector for solar thermal systems.

Design/methodology/approach

A representative flow and heat transfer study of different fluids in a straight tube is conducted, and the basic energy equation and radiative transfer equations are numerically solved to obtain the fluid temperature distribution and energy conversion efficiency. Ethylene glycol (EG) and different concentrations of (i.e., 0.1-0.6 per cent) multi-wall carbon nanotubes (MWCNT) in EG are used as sample fluids. Four cases are studied for a traditional PTC (i.e., using metal tube) and a direct absorption PTC (i.e., using transparent tube) including a bare tube, a tube with an air-filled glass envelope and a tube with vacuumed glass envelop. The numerical results are verified by an experimental study using a copper-glass absorber tube, which reveals the good potential of DANFs.

Findings

Compared with a conventional PTC, using DANF shows an increase of 8.6 per cent and 6.5 K, respectively, in thermal efficiency and outlet temperature difference at a volume fraction (0.5 per cent) of nanoparticles. The results also show that the improvement in solar efficiency increases with increasing particle concentrations, and the vacuum insulated case has the highest efficiency.

Originality/value

In all previous studies, an important section was missing as the effect of photons on the direct solar absorption trough collector, which is considered in this study. This paper proposes a new concept of using direct solar absorption nanofluids for concentrated solar collectors and analyzes the performance of both absorptance and transmittance efficiency considerations. To reveal the potential of the new concept, an analytical model based on energy balance is developed, and two case studies are performed.

Details

International Journal of Numerical Methods for Heat & Fluid Flow, vol. 30 no. 1
Type: Research Article
ISSN: 0961-5539

Keywords

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Article
Publication date: 1 February 1998

Jyoti Lata Pandey and M.K. Banerjee

Solar selective coatings are designed and formulated for effective collection and retention of solar energy. Several types of coatings can be utilized for economical…

Abstract

Solar selective coatings are designed and formulated for effective collection and retention of solar energy. Several types of coatings can be utilized for economical collection of solar energy, the most common and simplest will be ordinary non‐glass, heat resistant black paint. The coatings may be moderately selective or non‐selective absorbers, consisting of organic or inorganic matt black paints. These are easiest to apply and the least expensive of all collector coatings. In this category other types are ceramic and organic enamels and chemical or electrochemical metal conversion coatings. An impending energy crisis has already aroused interest and scientific pursuit in the field. An analysis of the state‐of‐the‐art in solar selective coatings was felt necessary at this time.

Details

Anti-Corrosion Methods and Materials, vol. 45 no. 1
Type: Research Article
ISSN: 0003-5599

Keywords

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