Thermal and Geometrical Assessment of Parabolic Trough Collector Mounted Double Evacuated Novel Receiver Tube System

2021 ◽  
Author(s):  
Sahil Thappa ◽  
Aditya Chauhan ◽  
Yatheshth Anand ◽  
Sanjeev Anand
Keyword(s):  
Flow Rate ◽  
High Energy ◽  
Fluid Temperature ◽  
Tube System ◽  
Parabolic Trough ◽  
Efficient Operation ◽  
Parabolic Trough Collector ◽  
Design Considerations ◽  
Energy And Exergy ◽  
Double Envelope

Abstract This paper particularly aims to highlight the necessity of optimal geometric design considerations of a parabolic trough collector (PTC) mounted novel receiver tube in view of efficient operation and high-end performance. Many investigations, analysis, and validation have been done in this regard as solar energy based PTC now a commercially mature technology acknowledges a variety of role in the form of power generation and other thermal applications. This article identifies the optimal rim angle corresponding to its tube size as required for high exergetic gains. Almost six receiver tubes, distinct in terms of dimensions and number of covers are compared for their best results to be mounted on adequate geometry with different rim angle (40°, 80°, and 120°). A significant variation of flow rate (i.e. 16 to 216 litre/hr) and inlet fluid temperature (i.e. 323 K, 423 K, 523 K, 623 K, and 723 K) has been extensively detailed about high energy and exergy retrieval from the system. The study reports that all the favorable results are found with the receiver tube having a diameter of 0.027 m and a double envelope, compared to other design considerations. Results show that as the flow rate increases energy efficiency also increases up to some extent along with increasing receiver tube temperature. The highest energy and exergy efficiency as reported to be 79.4% and 47% respectively with 80o being the optimal rim angle for a 5.7 m wide parabolic aperture.

Experimental Study of Parameters Affecting the Temperature of an Absorption Tube of Parabolic Trough Collector

2015 ◽  
Vol 362 ◽  
pp. 84-91
Author(s):  
Adel Kh. Alfozan ◽  
Saleh N. Al-Awairdy
Keyword(s):  
Design Of Experiments ◽  
Flow Rate ◽  
Heat Transfer Fluid ◽  
Tube Length ◽  
Fluid Temperature ◽  
Absorption Tube ◽  
Parabolic Trough ◽  
Parabolic Trough Collector ◽  
Effective Factor ◽  
College Of Technology

In this paper some important parameters affecting the temperature increase of the fluid inside an absorption tube of parabolic trough collector have been experimentally investigated using the Design of Experiments (DOE) method. These parameters are: absorption tube length, fluids type and fluid flow rate. The design of an absorption tube as well as a solar parabolic trough collector has been changed into different ways in order to increase the fluid temperature inside the absorption tube. The design of experiments plays a major role in identifying which factors are significant in increasing the temperature absorption inside the tube. The DOE method was validated using an experimental setup that is designed and fabricated by the Department of Mechanical Technology at Riyadh College of Technology. The experiments have been done on all the factors considered randomly using factorial design by merging all the factors together to know which factors and their interactions can affect more on increasing the fluid temperature inside absorption tube. Eight experiments with three replicates have been chosen randomly. From the results it is seen that the most significant effective factor to maximize fluid temperature is the flow rate and the interaction between absorption tube length and fluid type. It also was found that fluid temperature inside the collector was maximized when hydraulic oil was used as the heat transfer fluid and when the tube length was 436 mm.

Energy and Exergy Analysis of Multi-Temperature PCMs Employed in a Latent Heat Storage System and Parabolic Trough Collector

2018 ◽  
Vol 43 (3) ◽  
pp. 211-220 ◽  
Author(s):  
Beemkumar Nagappan ◽  
Karthikeyan Alagu ◽  
Yuvarajan Devarajan ◽  
Dinesh Babu Munuswamy
Keyword(s):  
Latent Heat ◽  
Mass Flow ◽  
Flow Rate ◽  
Exergy Analysis ◽  
Heat Storage ◽  
Storage System ◽  
Parabolic Trough ◽  
Latent Heat Storage ◽  
Parabolic Trough Collector ◽  
Energy And Exergy

AbstractThis study represents the exergy analysis of the evacuated tube parabolic trough collector and the cascaded latent heat storage system using multi-temperature phase change material (PCMs) during the charging process. The objective of the work is to control the losses and increase the efficiency of the system. The exergy analysis has been conducted on the basis of the first and second laws of thermodynamics in a parabolic trough collector with various mass flow rates of the heat transfer fluid (HTF). The overall variation of exergy efficiency of the collector with varying mass flow rate of the HTF is 5.9 %. The thermodynamic analysis of the cascaded latent heat storage system has been done during the charging process in which the PCM absorbs energy from the HTF and undergoes a phase transformation from the solid to the liquid state. The exergy analysis is conducted by varying the mass flow rate of the HTF in the storage system for both insulated and non-insulated systems. It is noticed that the variation of exergy stored for 5 and 10 liters per minute is 24.609 kW and 40.48 kW, respectively. It is concluded that the high range of energy and exergy stored in the system is achieved by the high flow rate of the HTF.

scholarly journals Contribution to the Parametric Study of the Performance of A Parabolic Trough Collector

2021 ◽  
Vol 321 ◽  
pp. 02016
Author(s):  
Belkacem Bouali ◽  
Hanane-Maria Regue
Keyword(s):  
Heat Transfer ◽  
Mass Flow ◽  
Flow Rate ◽  
Optimal Operation ◽  
Heat Transfer Fluid ◽  
Parabolic Trough ◽  
Parabolic Trough Collector ◽  
Heat Transfer Fluids ◽  
Ansys Cfx ◽  
Different Seasons

This paper presents an analysis of the performance of a parabolic trough collector (PTC) according to some key operating parameters. The effects of the secondary reflector, the length and thickness of the absorber tube (receiver tube) and the flow rate of the heat transfer fluid (HTF) are investigated. The main objective is to determine an optimal operation, which improves the performance of a traditional PTC. The target variables are the temperature at the outlet of the tube, the amount of energy collected by the HTF and the efficiency of the system. The solar flux data concern the city of LAGHOUAT located in the south of Algeria. Four days in different seasons are considered. The optical analysis of the system is performed by using the open source SolTrace code. The output of this analysis is used as a boundary condition for the CFD solver. The conjugate heat transfer and the fluid flow through the absorber tube are simulated by using ANSYS-CFX solver. Water is considered as heat transfer fluids. The obtained results show that the use of a curved secondary reflector significantly improves the performance of the traditional PTC. As the thickness of the tube increases, the heat storage in the material increases, which increases the temperature at the exit of the tube and therefore the efficiency of the system. However, the length of the tube depends on the mass flow of the HTF and vice versa. To keep the efficiency constant by choosing another length, it is necessary to choose a mass flow rate proportional to the flow rate corresponding to the initial length.

scholarly journals Small-Sized Parabolic Trough Collector System for Solar Dehumidification Application: Design, Development, and Potential Assessment

2018 ◽  
Vol 2018 ◽  
pp. 1-12
Author(s):  
Ghulam Qadar Chaudhary ◽  
Rubeena Kousar ◽  
Muzaffar Ali ◽  
Muhammad Amar ◽  
Khuram Pervez Amber ◽  
...  
Keyword(s):  
Thermal Energy ◽  
Maximum Temperature ◽  
Fluid Temperature ◽  
Design Development ◽  
Parabolic Trough ◽  
Peak Efficiency ◽  
Parabolic Trough Collector ◽  
Collector System ◽  
Evacuated Tube ◽  
Good Agreement

The current study presents a numerical and real-time performance analysis of a parabolic trough collector (PTC) system designed for solar air-conditioning applications. Initially, a thermodynamic model of PTC is developed using engineering equation solver (EES) having a capacity of around 3 kW. Then, an experimental PTC system setup is established with a concentration ratio of 9.93 using evacuated tube receivers. The experimental study is conducted under the climate of Taxila, Pakistan in accordance with ASHRAE 93-1986 standard. Furthermore, PTC system is integrated with a solid desiccant dehumidifier (SDD) to study the effect of various operating parameters such as direct solar radiation and inlet fluid temperature and its impact on dehumidification share. The experimental maximum temperature gain is around 5.2°C, with the peak efficiency of 62% on a sunny day. Similarly, maximum thermal energy gain on sunny and cloudy days is 3.07 kW and 2.33 kW, respectively. Afterwards, same comprehensive EES model of PTC with some modifications is used for annual transient analysis in TRNSYS for five different climates of Pakistan. Quetta revealed peak solar insolation of 656 W/m2 and peak thermal energy 1139 MJ with 46% efficiency. The comparison shows good agreement between simulated and experimental results with root mean square error of around 9%.

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 Thermal Performance Comparison of Parabolic Trough Collector (PTC) Using Various Nanofluids

2021 ◽  
Vol 10 (4) ◽  
pp. 875-889
Author(s):  
Ashutosh Shirole ◽  
Mahesh Wagh ◽  
Vivek Kulkarni
Keyword(s):  
Mass Flow Rate ◽  
Mass Flow ◽  
Flow Rate ◽  
Thermal Efficiency ◽  
Power Plants ◽  
Large Scale ◽  
Solar Thermal ◽  
Pumping Power ◽  
Parabolic Trough ◽  
Parabolic Trough Collector

The objective of this paper is to investigate the theoretical performance of Parabolic Trough Collector (PTC) using various nanofluids. The theoretical performances are calculated for Al2O3, graphite, magnetite, SWCNH, CuO, SiO2, MWCNT, TiO2, Fe2O3, and ZnO in water nanofluids. The heat transfer equations, thermodynamic properties of nanofluid and pumping power are utilised for the development of novel thermal model.  The theoretical thermal efficiency of the PTC is calculated, and the economic viability of the technology is predicted for a range of nanofluid concentration. The results showed that the thermal conductivity increases with the concentration of nanoparticles in the base fluid. Magnetite nanofluid showed the highest thermal efficiency, followed by CuO, MWCNT, ZnO, SWCNH, TiO2, Fe2O3, Al2O3, graphite, and SiO2, respectively. The study reveals that MWCNT at 0.4% concentration is the best-suited nanofluid considering thermal gain and pumping power. Most of the nanofluids achieved optimum efficiency at 0.4% concentration. The influence of mass flow rate on thermal efficiency is evaluated. When the mass flow rate increased from 70 Kg/hr to 90Kg/hr, a 10%-20% efficiency increase is observed. Dispersing nanofluids reduces the levelized cost of energy of large-scale power plants. These findings add to the knowledge of the scientific community aimed explicitly at solar thermal energy technology. The report can also be used as a base to pursue solar thermal projects on an economic basis.

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