scholarly journals Energy and exergy analyses of a parabolic trough collector operated with nanofluids for medium and high temperature applications

2018 ◽  
Vol 155 ◽  
pp. 201-217 ◽  
Author(s):  
A. Allouhi ◽  
M. Benzakour Amine ◽  
R. Saidur ◽  
T. Kousksou ◽  
A. Jamil
Keyword(s):  
High Temperature ◽  
Parabolic Trough ◽  
Parabolic Trough Collector ◽  
Energy And Exergy ◽  
Exergy Analyses ◽  
Temperature Applications

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.

Developments in High Temperature Parabolic Trough Receiver Technology

Solar Energy ◽  
2004 ◽  
Author(s):  
Henry Price ◽  
Mary Jane Hale ◽  
Rod Mahoney ◽  
Carin Gummo ◽  
Robert Fimbres ◽  
...  
Keyword(s):  
High Temperature ◽  
Solar Energy ◽  
High Efficiency ◽  
Failure Rates ◽  
Significant Issue ◽  
Parabolic Trough ◽  
Parabolic Trough Collector ◽  
Selective Coating ◽  
Linear Receiver ◽  
Glass Envelope

The parabolic trough linear receiver is one of the primary reasons for the high efficiency of the Luz parabolic trough collector design used at the Solar Energy Generating Systems (SEGS) plants. Experience from the SEGS plants has shown that the reliability and lifetime of the parabolic trough receiver tube is the most significant issue for existing and future parabolic trough plants. Although highly efficient, the original Luz receiver tubes experienced high failure rates (approximately 4% to 5% per year). Failures included vacuum loss, glass envelope breakage, and degradation of the selective coating. This paper reviews receiver failure rates, the primary failure causes at two of the SEGS plants, and discusses receiver technology developments during the last several years that focus on improving the reliability of parabolic trough receivers. Data are provided on the performance and reliability of a new commercially available trough receiver.

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.

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