scholarly journals EXPERIMENTAL STUDY OF STEAM GENERATION BY PARABOLIC TROUGH CONCENTRATOR WITH TWO AXES TRACKING

2021 ◽  
Vol 25 (Special) ◽  
pp. 2-15-2-24
Author(s):  
Yasameen S. Raheema ◽  
◽  
Bashar O. Bedaiwi ◽  
Keyword(s):  
Experimental Study ◽  
Flow Rate ◽  
Thermal Performance ◽  
System Performance ◽  
Solar Collector ◽  
Solar Concentrator ◽  
Steam Generation ◽  
Parabolic Trough ◽  
Parabolic Trough Solar Collector ◽  
Practical Investigation

This paper describes an experimental model for estimating parabolic trough solar collector performance, as the Arduino micro-controller technology was applied to improve the optical and thermal efficiency of the system. The receiving tubes of different internal diameters (2mm, 6mm) were implemented to evaluate system performance. The practical investigation of the solar concentrator was conducted to generate steam at moderate temperatures, as the experiments were executed in Baghdad with geographical coordinates (33° 18' N, 44° 21' E) during specific days. The results showed the effectiveness of small diameters, as the significant enhancement of thermal performance was at a flow rate of 8 L/h and receiver tube diameters of 2 mm, as the improvement was 30% compared to 6 mm tubes.

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...

The Dynamic Behavior of Once-Through Direct Steam Generation Parabolic Trough Solar Collector Row Under Moving Shadow Conditions

2017 ◽  
Vol 139 (4) ◽  
Author(s):  
Su Guo ◽  
Yinghao Chu ◽  
Deyou Liu ◽  
Xingying Chen ◽  
Chang Xu ◽  
...  
Keyword(s):  
Mass Flow Rate ◽  
Dynamic Behavior ◽  
Mass Flow ◽  
Flow Rate ◽  
Solar Collector ◽  
Outlet Temperature ◽  
Steam Generation ◽  
Parabolic Trough ◽  
Direct Steam ◽  
Parabolic Trough Solar Collector

Compared with recirculation and injection modes, once-through direct steam generation (DSG) parabolic troughs are simpler to construct and require the lowest investment. However, the heat transfer fluid (HTF) in once-through DSG parabolic trough systems has the most complicated dynamic behavior, particularly during periods of moving shadows caused by small clouds and jet contrails. In this paper, a nonlinear distributed parameter dynamic model (NDPDM) is proposed to model the dynamic behavior of once-through DSG parabolic trough solar collector row under moving shadow conditions. Compared with state-of-the-art models, the proposed NDPDM possesses three characteristics: (a) adopting real-time local values of the heat transfer and friction resistance coefficients, (b) simulating the whole collector row, including the boiler and the superheated sections, and (c) modeling the disturbance of direct normal irradiance (DNI) level on DSG parabolic trough solar collector row under moving shadow conditions. Validated using experimental data, the NDPDM accurately predicts the dynamic characteristics of HTF during periods of partial and moving DNI disturbance. The fundamental and specific dynamic process of fluid parameters for a DSG parabolic trough solar collector row is provided in this paper. The results show the following: (a) Moving shadows have a significant impact on the outlet temperature and mass flow rate, and the impact lasts up to 1000 s even after the shadows completely leave the collector row. (b) The time for outlet steam temperature to reach a steady-state value for the first time is independent of the shadow width, speed, and moving direction. (c) High-frequency chattering of the outlet mass flow rate can be observed under moving DNI disturbance and will have a longer duration if the shadow width is larger or the shadow speed is slower. Compared with cases in which the whole system is shaded, partially shading cases have shown a longer duration of high-frequency chattering. (d) Both wider widths and slower speeds of shadow will cause a larger amplitude of responses in the outlet temperature and mass flow rate. When the shadow speed is low, there is a longer delay time of response in the mass flow rate of the outlet fluid. (e) The amplitude of response in the outlet temperature does not depend on the direction of clouds movement. However, if the DNI disturbance starts at the inlet of the collector row, there will be significant delay times in both outlet temperature and mass flow rate, and a larger amplitude of response in outlet mass flow rate.

Studies on Thermal Performance of Closed Type Parabolic Trough Solar Collector

2011 ◽  
Vol 347-353 ◽  
pp. 812-821
Author(s):  
Zhong Zhu Qiu ◽  
Peng Li ◽  
Shao Lin Gong ◽  
Ye Wang ◽  
Wen Wen Guo ◽  
...  
Keyword(s):  
Thermal Performance ◽  
Solar Collector ◽  
Model Simulation ◽  
Test Bed ◽  
Parabolic Trough ◽  
Simulation Accuracy ◽  
Closed Type ◽  
Efficiency Test ◽  
Set Up ◽  
Parabolic Trough Solar Collector

To a closed type parabolic trough solar collector, thermal performance was analyzed, a mathematical model was set up, and test-bed of collector to heat efficiency test was built. According to the experiment test data, the accuracy of the thermal mathematics model was validated. The results show that the model simulation accuracy is so higher that the model is reasonable and available.

Sign in / Sign up

Export Citation Format

Share Document