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.

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.

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.

A Numerical Model for Off-Design Performance Calculation of Parabolic Trough Based Solar Power Plants

2010 ◽  
Author(s):  
Andrea Giostri ◽  
Claudio Saccilotto ◽  
Paolo Silva ◽  
Ennio Macchi ◽  
Giampaolo Manzolini
Keyword(s):  
Heat Transfer ◽  
Numerical Model ◽  
Heat Transfer Fluid ◽  
Working Fluid ◽  
Design Calculation ◽  
Fluid Temperature ◽  
Parabolic Trough ◽  
Design Algorithm ◽  
Energy Balances ◽  
Steam Cycle

The paper deals with the development and testing of an innovative code for the performance prediction of solar trough based CSP plants in off-design conditions. The code is developed in MS Visual Basic 6.0 with Excel as user interface. The proposed code originates from a previously presented algorithm for on-design sizing and cost estimation of the solar field lay-out, as well as of the main components of the plant, including connecting piping and the steam cycle. Off-design calculation starts from data obtained through the on-design algorithm and considers steady-state situations. Both models are implemented in the same software, named PATTO (PArabolic Trough Thermodynamic Optimization), which is very flexible: the optical-thermal model of collectors can simulate different kinds of parabolic trough systems in commerce, including a combination of various mirrors, receivers and supports. The code is also flexible in terms of working fluid, temperature and pressure range, and can also simulate direct steam generation plants (DSG). Regarding the power block, a conventional steam cycle with super-heater, eventually a re-heater section, and up to seven regenerative bleedings is adopted. The off-design model calculates thermal performance of collectors taking into account proper correlations for convective heat transfer coefficients, considering also boiling regime in DSG configurations. Solar plant heat and mass balances and performances at off-design conditions are estimated by accounting for the constraints imposed by the available heat transfer areas in heat exchangers and condenser, as well as the characteristic curve of the steam turbine. The numerical model can be used for a single calculation in a specific off-design condition, as well as for a whole year estimation of energy balances with an hourly resolution. The model is tested towards real applications and reference values found in literature; in particular, focusing on SEGS VI plant in the USA and SAM® code. Annual energy balances with ambient condition taken from TMY3 database are obtained, showing good accuracy of predicted performances. The code potentiality in the design process reveals twofold: it can be used for plant optimization in feasibility studies; moreover it is useful to find the best control strategy of a plant, especially the mass flow of heat transfer fluid in each operating condition.

Experimental Study of a Parabolic Trough Collector for Low Enthalpy Processes in the City of Barranquilla

2017 ◽  
Author(s):  
Jainer S. Rodríguez ◽  
Duván C. Villegas ◽  
Marley C. Vanegas ◽  
Guillermo E. Valencia
Keyword(s):  
Tracking System ◽  
Experimental Tests ◽  
Metal Structure ◽  
Light Metal ◽  
Heat Transfer Fluid ◽  
Surface Compound ◽  
Solar Thermal Energy ◽  
Parabolic Trough ◽  
Parabolic Trough Collector ◽  
The City

Solar thermal energy is an alternative to provide heat for low-enthalpy processes at commercial and residential sectors in communities with energy sources scarcity. The present work is focused in the experimental performance analysis of a parabolic trough collector (PTC) designed and manufactured to minimize construction costs by setting the best parabolic profile and rim angle to improve thermal efficiency through enhancing light reflection in its parabolic surface, compound by conventional flat mirrors. The design considers an uncovered copper alloy receiver aligned with the focus of the reflective surface supported on a light metal structure. Sunlight collection area was defined at 1.2 m2 to allow installation of serial or parallel modular arrangements at reduced spaces like a building rooftop, the concentration ratio for this PTC is close to 33. This device was designed to use water as heat transfer fluid (HTF) and to be operated under environmental conditions of the city of Barranquilla, Efficiency curves were obtained based on experimental tests conducted with multiple HTF flow rate and varying reflecting surface slope for one PTC, obtaining a peak efficiency of 48 % and a without a tracking system. This device can be manufactured with a cost close to 80 USD/m2.

scholarly journals Thermal Examination of Vapour Absorption System using Experimental Design Method

2019 ◽  
Vol 8 (6S) ◽  
pp. 1101-1104
Keyword(s):  
Cooling System ◽  
Industrial Applications ◽  
Heat Transfer Fluid ◽  
Thermodynamic Evaluation ◽  
Absorption Refrigeration ◽  
Parabolic Trough ◽  
Pressurized Water ◽  
Parabolic Trough Collector ◽  
Vapor Absorption ◽  
Vapor Absorption Refrigeration

The experimental investigation has been carried out for 100 kW triple-effect vapor absorption refrigeration systems using parabolic trough collector. The data have been recorded and analyzed for designing a new vapor absorption refrigeration system with process heat for industrial applications for Gurugram regions of India. The solar resources have also been analyzed for designing of the system. The thermodynamic evaluation of 100 kW triple-effect vapor absorption refrigeration systems has analyzed for different parameters. The heat is supplied from solar thermal technology which converts solar radiation to useful heat of the total input energy of the proposed cooling system is taken from the heat transfer fluid through parabolic trough collector (PTC) as per availability of solar insolation at the pressurized water of 140-180 oC supplied to the generator at a mass flow rate of 7 kg/s. It is analyzed that in the month of November radiation drops because of cosine losses as compared to May and Direct Normal Irradiance decreases in the month of December, January, July, August, and September.

Comparative Study on Parabolic Trough Collector by using Different Heat Transfer Fluids

2019 ◽  
Vol 11 (4) ◽  
Author(s):  
Krishna Mounica ◽  
Y.V. Hanumantha Rao ◽  
Vinay Atgur ◽  
G. Manavendra ◽  
B. Srinivasa Rao
Keyword(s):  
Heat Transfer ◽  
Mass Flow ◽  
Thermal Model ◽  
Heat Transfer Fluid ◽  
Parabolic Trough ◽  
Flow Rates ◽  
Parabolic Trough Collector ◽  
Heat Transfer Fluids ◽  
Mass Flow Rates ◽  
Simulation Results

In this paper the use of Syltherm-800 and Therminol-55 thermal oils in parabolic trough collector (PTC) is investigated with inlet temperatures of 375.35 K, 424.15 K, 470.65 K and 523.85 K and for mass flow rates of 4, 4.5 and 5 kg/sec. Analysis has been carried out using a thermal model and validated using the simulation results. Therminol-55 gives better heat transfer coefficient compared to Syltherm-800. Since Therminol-55 has higher specific heat and viscosity when compared to Syltherm-800, the use of Syltherm-800 as a heat transfer fluid in PTC is preferred. Better results are observed for temperature of 375.35 K and mass flow rate of 4 kg/sec.

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%.

Energy and Exergy Analysis of Thermal Energy Storage Prototype by Using Concrete Material in Thailand

2016 ◽  
Vol 839 ◽  
pp. 14-22
Author(s):  
Rungrudee Boonsu ◽  
Sukruedee Sukchai
Keyword(s):  
Heat Transfer ◽  
Energy Efficiency ◽  
Energy Storage ◽  
Flow Rate ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Heat Transfer Fluid ◽  
Saturated Steam ◽  
Fluid Temperature ◽  
Flow Rates

The research was performed on thermal energy storage prototype in Thailand. Concrete was used as the solid media sensible heat material in order to fulfill local material utilization which is easy to handle and low cost. Saturated steam was used for heat transfer fluid. The thermal energy storage prototype was composed of pipes embedded in a concrete storage block. The embedded pipes were used for transporting and distributing the heat transfer medium while sustaining the pressure. The heat exchanger was composed of 16 pipes with an inner diameter of 12 mm and wall thickness of 7 mm. They were distributed in a square arrangement of 4 by 4 pipes with a separation of 80 mm. The storage prototype had the dimensions of 0.5 x 0.5 x 4 m. The charging temperature was maintained at 180°C with the flow rates of 0.009, 0.0012 and 0.014 kg/s whereas the inlet temperature of the discharge was maintained at 110°C. The performance evaluation of a thermal energy storage prototype was investigated in the part of charging/discharging. The experiment found that the increase or decrease in storage temperature depends on the heat transfer fluid temperature, flow rates, and initial temperature. The energy efficiency of the thermal energy storage prototype at the flow rate of 0.012 kg/s was the best because it dramatically increased and gave 41% of energy efficiency in the first 45 minutes after which it continued to rise yet only gradually. Over 180 minutes of operation time, the energy efficiency at this flow rate was 53% and the exergy efficiency was 38%.

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