scholarly journals An Experimental Work on the Performance of Single Solar Still with Parabolic Trough Collector in Hot Climate Conditions

2021 ◽  
Vol 39 (5) ◽  
pp. 1627-1633
Author(s):  
Hawraa Fadhel ◽  
Qahtan A. Abed ◽  
Dhafer M. Hachim
Keyword(s):  
Weather Conditions ◽  
Working Fluid ◽  
Distilled Water ◽  
Fluid Temperature ◽  
Productivity Analysis ◽  
Solar Still ◽  
Parabolic Trough ◽  
Parabolic Trough Collector ◽  
Climate Conditions ◽  
Hot Climate

This study investigated the production of single slope solar still and the influence of combining with a parabolic trough collector. The effect of the different working fluid types on freshwater productivity, outlet working fluid temperature, heat gain, and thermal efficiency has been studied under the weather conditions of south city of Iraq/ Najaf (32° 1' N / 44° 1' E). The first type was water and the second type is nanofluid. The results of the comparison showed when using water as a working fluid flowing inside the receiving tube for different days; the highest temperatures were obtained at 12:00 pm, and the average productivity of distilled water was obtained in May and June 2021 were 4.5358 and 6.733 kg/m2/day respectively. While when using the nanofluid as a working fluid flowing inside the Parabolic Trough Collector (PTC) receiver tube, the outlet temperatures were rising for the same comparison days with an increase in the productivity of distilled water. Where the freshwater productivity during the day was 8.745328 kg /m2 /day as, and it was 9.018119 kg/m2/day during the other day. A productivity analysis was carried out for two different working fluid types (Water and nanofluid instead of water) as a fluid running inside the receiving tube of PTC. The freshwater produced from PTC (with nanofluid) was a 42.2% improvement in productivity compared with conventional PTC.

scholarly journals EXPERIMENTAL INVESTIGATIONS OF A SOLAR PARABOLIC TROUGH COLLECTOR FOR CIRCULAR AND ELLIPTICAL ABSORBER

2017 ◽  
Vol 13 (7) ◽  
pp. 6348-6355
Author(s):  
Suresh. R ◽  
Subash Chandra Bose.R ◽  
Arumugam. K ◽  
Anbazhagan. R ◽  
Sathiyamoorthy. V ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Rate ◽  
Energy Demand ◽  
Transfer Rate ◽  
Working Fluid ◽  
Experimental Investigations ◽  
Outlet Temperature ◽  
Fluid Temperature ◽  
Parabolic Trough ◽  
Parabolic Trough Collector

             Solar parabolic trough collector is one of the most efficient and an effective technology to deal with environmental pollution and it has gained much attention due to the recent energy demand. The solar parabolic trough collector is one of the most promising techniques for absorbing the heat from the sun. This heat is utilized for electricity generation and other industrial heating applications. This paper describes the theoretical and experimental assessment of performance of the circular and elliptical absorbers used in solar parabolic trough collector. The absorber tube of parabolic trough collector is used to transfer the heat to the working fluid. The working fluid considered over here is water which is the best operating medium in direct steam generation. The mass flow rate of water in absorber tube is analyzed in 3 stages as 0.016, 0.024 and 0.030 kg/s respectively. The experimental test is done in Chennai-Tamilnadu, Southern part of India which experiences a superior temperature throughout the year. The experiment is conducted for the period of one year from June 2015 to May 2016. The performance improvement focuses on collector efficiency, useful heat transfer rate, outlet temperature of working fluid, temperature gradient, overall heat transfer rate and the thermal losses.

scholarly journals Mathematical Model of a Sun-Tracked Parabolic Trough Collector and Its Verification

Energies ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 4168
Author(s):  
Wiesław Zima ◽  
Artur Cebula ◽  
Piotr Cisek
Keyword(s):  
Working Fluid ◽  
Energy Yield ◽  
Measured Temperature ◽  
Fluid Temperature ◽  
Parabolic Trough ◽  
Ansys Fluent ◽  
Model Calculations ◽  
Parabolic Trough Collector ◽  
One Dimensional ◽  
Heat Intake

The paper presents a one-dimensional distributed parameter model for simulating the transient-state operation of a parabolic trough collector (PTC). The analyzed solar collector has a module design and is equipped with a two-axis sun-tracking system to increase the solar energy yield. The single module is composed of an evacuated tube and a set of parabolic mirrors acting as reflectors. In each of the collector tubes, two aluminum U-tubes are installed, enabling heat intake by the solar fluid. The collector is intended for household applications, as well as other medium thermal energy demand uses. During the numerical model development, appropriate energy balance differential equations are formulated for the collector individual components. The equations are solved using different schemes. As a result, a time- and space-dependent temperature series for each of the collector components and the working fluid are obtained. To select an appropriate time and spatial steps for the developed model and to verify the reliability of the results received, the collector model is also implemented in ANSYS Fluent. The results of the one-dimensional model calculations and comparisons carried out in ANSYS demonstrate considerable agreement. In particular, the values of the fluid temperature at the collector outlet, calculated using the model developed, show high consistency with the ANSYS Fluent results. Furthermore, a preliminary experimental verification of the proposed model is carried out on a test stand currently under construction. The computed and measured temperature course of the fluid at the collector outlet is compared. In this case, the results are also satisfactory.

scholarly journals Experimental investigation of simultaneous effect of parabolic trough collector and flat external reflectors on performance of stepped solar still

2021 ◽  
Author(s):  
Jamasb Pirkandi ◽  
Farshid Kassaei ◽  
Mahdi Hashemabadi
Keyword(s):  
Electrical Conductivity ◽  
Experimental Investigation ◽  
Solar Energy ◽  
Saline Water ◽  
Distilled Water ◽  
Solar Still ◽  
Parabolic Trough ◽  
Parabolic Trough Collector ◽  
Chemical Substances ◽  
Water Output

Abstract In this research, the performance of stepped solar still has been experimentally evaluated. For this purpose, a parabolic trough collector has been used to preheat the saline water entering the solar still. Also, two flat external reflectors have been employed to increase the amount of solar energy received by the steps and the collector of the system. The findings of this research indicate that the use of two flat external reflectors is more effective than using the trough collector. Also, it is more efficient to apply both mechanisms simultaneously than to use them separately. According to the obtained results, the distilled water output of the solar still is 760, 1,560, 2,440 and 2,760 ml/m2, respectively, for operating the conventional solar still, using the trough collector, using the two flat external reflectors, and using the collector and reflectors simultaneously. The electrical conductivity due to the presence of salt and chemical substances dissolved in the distilled water discharged from the still is 255, 215, 62 and 38 micro Siemens per centimetre, respectively, for each of the four mentioned cases. These experiments show that by applying the proposed mechanisms, the amount of distilled water can be increased, and its purity can be enhanced.

Development of an Innovative Code for the Design of Different Parabolic Trough Solar Fields

2009 ◽  
Author(s):  
Ennio Macchi ◽  
Giampaolo Manzolini ◽  
Paolo Silva
Keyword(s):  
Solar Energy ◽  
Energy Demand ◽  
Working Fluid ◽  
Fluid Temperature ◽  
Parabolic Trough ◽  
High Solar Radiation ◽  
Power Block ◽  
The Usa ◽  
Solar Field ◽  
Steam Cycle

The role of renewable energies and in particular solar energy could be fundamental in future scenarios of worldwide increase of energy demand: thermodynamic solar energy can play an important role in country with high solar radiation. This paper discusses the development and testing of an innovative code for the prediction of thermodynamic performances at nominal conditions and the estimation of costs of the whole plant, for different parabolic trough solar fields. The code allows a preliminary design of the solar field lay-out, the sizing of the main components of the plant and the optimization of the steam cycle. The code, named PATTO (PArabolic Trough Thermodynamic Optimization), allows to separately calculate the thermal efficiency of (i) parabolic trough systems in commerce as well as (ii) combination of components of various commercial systems, in order to exploit different technology solutions: combination of mirrors, receivers and supports. Using the selected parabolic troughs, the plant configuration is then completed by connecting pipes, heat exchangers, the steam cycle, and storage tanks. The code is also flexible in terms of working fluid, temperature and pressure range. Regarding the power block, a conventional steam cycle with super-heater and re-heater sections and up to seven regenerative bleedings is adopted. It is possible to use also simpler configuration as without re-heater or with less regenerative bleedings. Moreover, thanks to simple or sophisticated economic correlations depending on available data, the code calculates the overall investment cost for the considered solar field and the power block. The code performs steady state analysis at nominal conditions, while future developments are planned regarding part load analysis and transient simulations. The model is tested towards real applications and reference values found in literature; in particular, focusing on SEGS VI plant in the USA. Detailed results showing code potentiality, are presented in terms of solar field and power block energy balances, plant auxiliaries, piping and economic analysis.

scholarly journals A Zero-Liquid Discharge Model for a Transient Solar-Powered Desalination System for Greenhouse

Water ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 1440 ◽  
Author(s):  
Mohammad Akrami ◽  
Alaa Salah ◽  
Mahdieh Dibaj ◽  
Maxime Porcheron ◽  
Akbar Javadi ◽  
...  
Keyword(s):  
Rainwater Harvesting ◽  
Weather Conditions ◽  
Maximum Amount ◽  
Distilled Water ◽  
Solar Still ◽  
Discharge System ◽  
Sustainable Technologies ◽  
Solar Radiation Intensity ◽  
Liquid Discharge ◽  
The Uk

The need for sustainable desalination arises from fast-occurring global warming and intensifying droughts due to increasing temperatures, particularly in the Middle East and North African (MENA) regions. Lack of water resources has meant that the countries in these regions have had to desalinate seawater through different sustainable technologies for food supplies and agricultural products. Greenhouses (GH) are used to protect crops from harsh climates, creating a controlled environment requiring less water. In order to have a sustainable resilient GH, a zero-liquid-discharge system (ZLD) was developed by using solar still (SS) desalination techniques, humidification-dehumidification (HDH), and rainwater harvesting. An experiment was designed and carried out by designing and manufacturing a wick type solar still, together with an HDH system, implemented into a GH. Using a pyrometer, the solar intensity was recorded, while the microclimate conditions (temperature and relative humidity) of the GH were also monitored. The GH model was tested in the UK and was shown to be a successful standalone model, providing its water requirements. In the UK, for one solar still with a surface area of 0.72 m2, maximum amount of 58 mL of distilled water was achieved per day. In Egypt, a maximum amount of 1090 mL water was collected per day, from each solar still. This difference is mainly due to the differences in the solar radiation intensity and duration in addition to the temperature variance. While dehumidification generated 7 L of distilled water, rainwater harvesting was added as another solution to the greenhouse in the UK, harvested a maximum of 7 L per day from one side (half the area of the greenhouse roof). This helped to compensate for the less distilled water from the solar stills. The results for the developed greenhouses showed how GHs in countries with different weather conditions could be standalone systems for their agricultural water requirement.

Dynamic Analysis of Direct Steam Generating Parabolic Trough Collector System

2020 ◽  
Vol 143 (3) ◽  
Author(s):  
C. V. Chachin Vishal ◽  
Jayaraj Krishnan ◽  
G. Venkatesan ◽  
V. Samson Packiaraj Raphael ◽  
Purnima Jalihal
Keyword(s):  
Pressure Drop ◽  
Working Fluid ◽  
Maximum Pressure ◽  
Parabolic Trough ◽  
Thermal Systems ◽  
Parabolic Trough Collector ◽  
Collector System ◽  
Multi Stage ◽  
Direct Steam ◽  
Mass Flowrate

Abstract Conventional desalination technologies like multi stage flashing, multi-effect desalination (MED) using steam as motive fluid can be made sustainable by obtaining the motive steam from solar thermal systems. In this study, a transient simulation has been performed to determine the dissimilitude in pressure drop and dryness fraction, of working fluid in absorber tube due to variation in solar irradiance. A one-dimensional (1D) mathematical model has been developed using matlab for assessing the thermal performance and heat transfer characteristics of a direct steam generating (DSG) parabolic trough collector (PTC) system. It was observed that maximum pressure drop does not occur at maximum quality indicating the working conditions impair the system performance. The developed model was used to overcome this by varying both pressure and mass flowrate of working fluid in accordance to the radiation, results indicated reduction in pressure drop during the same time period for the same exit quality.

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