scholarly journals An Investigation of the Effect of Different Nanofluids in a Solar Collector

2017 ◽  
Vol 7 (4) ◽  
pp. 1741-1745
Author(s):  
H. A. Fakhim
Keyword(s):  
Thermal Efficiency ◽  
Solar Collector ◽  
Concentration Ratio ◽  
Volume Fraction ◽  
Fluid Velocity ◽  
Average Temperature ◽  
Nano Fluid ◽  
Parabolic Form ◽  
Parabolic Collector

In this article, we examine the use of different nanofluids in a solar collector in a parabolic form. Temperature, thermal efficiency and outlet average temperature for a conventional parabolic collector and a collector with nanofluid are compared. The effect of various parameters (concentration ratio, volume fraction of nanoparticles, absorption and fluid velocity) are studied. Results are discussed and it is shown that nano fluid increases the efficiency of the collector.

Next Generation Parabolic Trough Solar Collectors for CSP

2012 ◽  
Author(s):  
Daniel T. Chen ◽  
Glenn Reynolds ◽  
Allison Gray ◽  
Ben Ihas ◽  
Gary Curtis ◽  
...  
Keyword(s):  
Solar Collector ◽  
Concentration Ratio ◽  
Step Change ◽  
Successful Implementation ◽  
National Renewable Energy Laboratory ◽  
Parabolic Trough ◽  
Space Frames ◽  
The Subject ◽  
Utility Scale ◽  
Parabolic Collector

In order for Concentrating Solar Power (CSP) to become a significant contributor to utility scale baseload power, dramatic reductions in cost and increases in performance must be achieved. 3M Company and Gossamer Space Frames have developed advanced collectors that are centered on a step-change in solar technology aimed at transforming the economics and industrialization of CSP. In particular, we focus on mirror film based reflective materials, stiff and shape accurate panel constructions, and lightweight and accurate space frames. These technology elements have been combined into a new parabolic collector design with an aperture of 7.3 m and length of 12 m. The geometric concentration ratio of the design is 103, far exceeding current designs. The National Renewable Energy Laboratory (NREL) has measured an intercept factor exceeding 99% on the subject collector fielded at SEGS II (Daggett, CA). The successful implementation of this technology platform has implications for new solar collector designs for both point and line focus systems.

scholarly journals Improving the Thermal Efficiency of Flat Plate Solar Collector Using Nano-Fluids as a Working Fluids: A Review

2021 ◽  
Vol 8 (3) ◽  
Author(s):  
Saif Ali Kadhim ◽  
Osama Abd AL-Munaf Ibrahim
Keyword(s):  
Flat Plate ◽  
Thermal Efficiency ◽  
Solar Collector ◽  
Base Fluid ◽  
Working Fluid ◽  
Solar Collectors ◽  
Nano Fluid ◽  
Flat Plate Solar Collector ◽  
Nano Fluids ◽  
Better Than

Solar energy is one of the most important types of renewable energy and is characterized by its availability, especially in Iraq. It can be used in many applications, including supply thermal energy by solar collectors. Improving the thermal efficiency of solar collector leads to an increase in the thermal energy supplied. Using a nano-fluid instead of base fluid (water is often used) as a working fluid is a method many used to increase the thermal efficiency of solar collectors. In this article, the latest research that used nano-fluid as a working fluid in evaluating the thermal efficiency of solar collector, type flat plate was reviewed. The thermal efficiency improvement of flat plate solar collector was reviewed based on the type of nanoparticles (metal oxides, semiconductors oxides, carbon compounds) used in the base fluid and comparison was made between these nanoparticles under the same conditions. Moreover, the effect of varying the concentration of nanoparticles in the base fluid and changing the working fluid flow rate on the thermal efficiency of flat plate solar collector was also reviewed. The results of the review showed that nano-fluids containing carbon compounds are better than other nano-fluids and that copper oxide is better than the rest of the metal oxides used in improving the thermal efficiency of flat plate solar collectors.

Experimental Study on Thermal Efficiency of Parabolic Trough Collector (PTC) Using Al2O3/H2O Nanofluid

2015 ◽  
Vol 787 ◽  
pp. 192-196
Author(s):  
E. Siva Reddy ◽  
R. Meenakshi Reddy ◽  
K. Krishna Reddy
Keyword(s):  
Experimental Study ◽  
Solar Energy ◽  
Thermal Efficiency ◽  
Base Fluid ◽  
Concentration Ratio ◽  
Volume Fraction ◽  
Nano Particles ◽  
Parabolic Trough ◽  
Flow Rates ◽  
Parabolic Trough Collector

Dispersing small amounts of solid nano particles into base-fluid has a significant impact on the thermo-physical properties of the base-fluid. These properties are utilized for effective capture and transportation of solar energy. This paper attempts key idea for harvesting solar energy by using alumina nanofluid in concentrating parabolic trough collectors. An experimental study is carried out to investigate the performance of a parabolic trough collector using Al2O3-H2O based nanofluid. Results clearly indicate that at same ambient, inlet temperatures, flow rate, concentration ratio etc. hike in thermal efficiency is around 5-10 % compared to the conventional Parabolic Trough Collector (PTC). Further, the effect of various parameters such as concentration ratio, receiver length, fluid velocity, volume fraction of nano particles has been studied. The different flow rates employed in the experiment are 2 ml/s, 4 ml/s and 6 ml/s. Volumetric concentration of 0.02%, 0.04% and 0.06% has been studied in the experiment. Surfactants are not introduced to avoid bubble formation. Tracking mode of parabolic trough collector is manual. Results also reveal that Al2O3-H2O based nanofluid has higher efficiency at higher flow rates.

scholarly journals Thermal Performance of Nanofluid Flow Inside Evacuated Tube Solar Collector

2021 ◽  
Vol 39 (4) ◽  
pp. 1262-1270
Author(s):  
Mohammad H. Yazdi ◽  
Evgeny Solomin ◽  
Ahmad Fudholi ◽  
Ghasem Divandari ◽  
Kamaruzzaman Sopian ◽  
...  
Keyword(s):  
Thermal Efficiency ◽  
Solar Collector ◽  
Volume Fraction ◽  
Flow Behavior ◽  
Pure Water ◽  
Radiant Energy ◽  
Solar Collectors ◽  
Nanofluid Flow ◽  
Ansys Fluent ◽  
Solar Radiation Incident

Solar collectors are systems for absorbing the sun's radiant energy and converting it into heat. The working principle of solar collectors are relying on the solar radiation incident upon the transparent surface, and the collected radiation heat is stored within the operating fluid. However, the conventional operating fluid is less than satisfactory in term of promoting the thermal efficiency of solar collector. Consequently, the aim of this paper is to investigate the use of nanofluid as an operating fluid in a single end evacuated solar collector. The expectation is that the flow behavior of nanofluid can lead to the improvement of thermal efficiency of solar collector. The design of solar collector is carried out using Gambit software and the heat transfer characteristics are simulated by nanofluid flow with 1%, 3% and 5% volumes by ANSYS Fluent software. The results demonstrate good agreement with existing experimental results. The numerical analysis shows the improvement of collector performance compared to pure water fluid. The results show that by increasing the nanoparticles volume fraction the efficiency of the collector improves significantly.

scholarly journals Thermal Performance Improvement Study of a Solar Collector with Compound Parabolic Concentrator

2018 ◽  
Vol 3 (11) ◽  
pp. 78-82
Author(s):  
Md. Forhad Ibne Al Imam ◽  
Rafiqul Alam Beg ◽  
Shamimur Rahman
Keyword(s):  
Water Temperature ◽  
Flat Plate ◽  
Thermal Performance ◽  
Thermal Efficiency ◽  
Solar Collector ◽  
Compound Parabolic Concentrator ◽  
Collector System ◽  
Solar Intensity ◽  
Flat Plate Collector ◽  
Parabolic Collector

Heating water with solar energy is easy and effective in both domestic and industrial areas. The initial implementation cost of a solar-water-heating system is high but long term use of it makes it cost effective. For geographical location, Bangladesh is very suitable for using it. In a solar collector system, collector area is an important design factor. To achieve better thermal performance, 0.81m2 solar collector was used in this study. Commonly used flat plate collector takes more space to be installed. In Bangladesh, space on the roofs of houses and industries are limited and so there is a little scope to use flat plate collector system. Compound parabolic collector can solve this problem. Solar collector with compound parabolic collector needs less space than flat plate collector with reflector. When compound parabolic concentrator was attached with the solar collector, thermal performance improves. Compare with other alternatives that improve thermal efficiency, compound parabolic concentrator shows better thermal performance. Compare thermal efficiency of the consecutive three months. In this system, when water flow rate increase, outlet water temperature decrease but thermal efficiency increases. It is also observed that when solar intensity increases, thermal efficiency also increases likewise when solar intensity decreases, thermal efficiency also decreases. In this research, outputs of different similar researches are compared to show the effectiveness of the compound parabolic concentrator based solar collector. The compound parabolic concentrator reflects more solar radiation, eventually directs it to the collector and increased the difference between the inlet and outlet water temperature.

Comparative Thermal Performance of a Parabolic Trough Receiver With Cu-Therminol®VP-1, Ag-Therminol®VP-1 and Al2O3-Therminol®VP-1 Nanofluids

2016 ◽  
Author(s):  
Aggrey Mwesigye ◽  
Zhongjie Huan ◽  
Josua P. Meyer
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Thermal Performance ◽  
Thermal Efficiency ◽  
Base Fluid ◽  
Concentration Ratio ◽  
Volume Fraction ◽  
Parabolic Trough ◽  
High Concentration ◽  
Flux Boundary Condition

As parabolic trough systems with high concentration ratios become feasible, convective heat transfer enhancement is expected to play a significant role in improving the thermal and thermodynamic performance of these systems. In this paper, the thermal performances of a high concentration ratio system using three different types of nanofluids were investigated. A system with a geometric concentration ratio of 113 and a rim angle of 80° was used in this study. The nanofluids considered were copper-Therminol®VP-1, silver-Therminol®VP-1 and Al2O3-Therminol®VP-1 nanofluid. For each nanofluid, the volume fraction of the nanoparticles in the base fluid was varied from 0–6%. The numerical solution was obtained using a finite volume based computational fluid dynamics tool. Temperature dependent properties were used for both the base fluid and the nanoparticles. An actual receiver heat flux boundary condition obtained using Monte Carlo ray tracing was coupled to the computational fluid dynamics code to model the thermal performance of the receiver. Results show that for each nanofluid used, the thermal performance of the receiver improves significantly. The thermal efficiency increases by about 12.5%, 13.9% and 7.2% for the copper-Therminol®VP-1, silver-Therminol®VP-1 and Al2O3-Therminol®VP-1 nanofluids, respectively as the volume fraction increases from 0 to 6%. The thermal efficiency improvement with silver-Therminol®VP-1 was the highest of the considered nanofluids owing to the relatively higher thermal conductivity of silver.

A Novel Application for Parabolic Trough Solar Collector Based on Helical Receiver Tube and Nano-Fluid with a Solar Tracking Mechanism

2020 ◽  
Vol 38 (5A) ◽  
pp. 656-668
Author(s):  
Saad T. Hamidi
Keyword(s):  
Flow Rate ◽  
Thermal Performance ◽  
Solar Collector ◽  
Volume Fraction ◽  
Helical Coil ◽  
Distilled Water ◽  
Parabolic Trough ◽  
Nano Fluid ◽  
Solar Tracking ◽  
Parabolic Trough Solar Collector

Novel techniques to enhance thermal performance using a helical coil receiver tube and nano-fluid materials are presented in this paper. Two different applied techniques to enhance thermal performance are used as a new application on parabolic trough solar collector (PTSC). Lots of researches are going on to enhance the heat transfer rate using the helical coil tube and nano-fluid for heat exchanger and dish solar concentrated. So that these combining techniques together combined with the PTSC can be considered as a new application. Novel techniques to enhance thermal performance using a helical coil receiver tube and Nano-fluid materials are presented in this paper. Two different applied techniques to enhance thermal performance are used as a new application on parabolic trough solar collector (PTSC). In the present work, PTSC has been fabricated using Dioxide Silicon SiO2 with an average particle size of 40nm by taking volume fraction of SiO2 0.1, 0.2 and 0.3%. Distilled water based Nano-fluid as a working fluid and a helical coil receiver tube were used in this paper. Varying the flow rate of Nano-fluids 100,150 and 200l/h are used, respectively. A solar tracking mechanism experimentally has been used with the PTSC. As per ASHRAE standard, the experimental results showed that at volume fraction 0.3 % and flow rate of 200 l/h, the highest increase in the energy absorbed factor FR(τα) was 14.6 %  and energy removal factor FRUL was 29.4 % compared with distilled water...

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