Thermal Modeling of Concentrated Photovoltaic Thermal System at Different Operating Conditions

2018 ◽  
Author(s):  
Shah Alam ◽  
Rahul Yelamanchili
Keyword(s):  
Heat Flux ◽  
Thermal Modeling ◽  
Photovoltaic Cells ◽  
Primary Objective ◽  
Operating Conditions ◽  
Thermal System ◽  
Maximum Output ◽  
Cooling Channel ◽  
Element Analysis ◽  
Photovoltaic Thermal System

Concentrated photovoltaic thermal system is a reliable solar energy system that utilizes sunlight of higher concentration on a photovoltaic cell to generate energy that is superior to conventional solar systems due to fewer space requirements and high electrical and thermal efficiencies. The primary objective of this thesis was to test two operating conditions of the concentrated photovoltaic thermal system and find the condition that delivers maximum output when compared to the other. The first condition tested in this research included variable velocity of water flowing in the cooling channel while a constant amount of heat flux was applied on the photovoltaic cells. The second tested condition included constant velocity of water flowing in the cooling channel while varying the amount of heat flux applied on the photovoltaic cells. Through mathematical modeling, that includes, thermal modeling and energy analysis was carried out for the concentrated photovoltaic thermal system along with simulations of the system that were performed using a three-dimensional finite element analysis software called Ansys Workbench (Fluent). The results from this research provide a useful path in improving the efficiency of the concentrated photovoltaic thermal system.

A Probabilistic Approach to the Thermo-Mechanical Analysis of Coke Drums

2016 ◽  
Author(s):  
Edrissa Gassama ◽  
Daniel W. Spring ◽  
Aaron Stenta ◽  
Jeffrey Cochran ◽  
Charles Panzarella
Keyword(s):  
Heat Flux ◽  
Financial Analysis ◽  
Probabilistic Approach ◽  
Companion Paper ◽  
Mechanical Analysis ◽  
Operating Conditions ◽  
Plastic Behavior ◽  
Element Analysis ◽  
Operating Cycle ◽  
Flux Profile

A coke drum experiences operating conditions that are severe and unrelenting, and their lifespans reflect this. In this paper, a coupled thermal-mechanical model of an operating coke drum is presented. The impacts of important operating parameters, such as the cycle time and quench rate, on an ideal operating cycle and a cycle that produces hotspots are discussed. The model is constructed in three stages: (i) the through-wall temperature distribution is probabilistically determined using a Bayesian inverse approach that calculates the heat flux profile on the inside of the drum wall from a temperature reading on the outside of the wall; (ii) a thermal-mechanical finite element analysis of the drum wall is conducted using the heat flux profile as a spatially and temporally varying boundary condition — to obtain the stress and strain behavior at a critical location (weld seam) on the drum; and (iii) hotspots are introduced in the vicinity of the weld through a novel approach, and their impact on the plastic behavior of the drum wall is examined. The influence of the operating conditions on the behavior of the coke drum is to be incorporated into a financial analysis of the entire coke drum’s life cycle — in a companion paper — to determine an optimal operating strategy.

Numerical analysis of local heat flux and thin-slab solidification in a CSP funnel-type mold with electromagnetic braking

2020 ◽  
Vol 117 (6) ◽  
pp. 602
Author(s):  
Heping Liu ◽  
Jianjun Zhang ◽  
Hongbiao Tao ◽  
Hui Zhang
Keyword(s):  
Heat Flux ◽  
Casting Speed ◽  
Shell Growth ◽  
Local Heat ◽  
Operating Conditions ◽  
Thin Slab ◽  
Wide Face ◽  
Slab Width ◽  
Steel Grades ◽  
Local Heat Flux

In this article, based on the actual monitored temperature data from mold copper plate with a dense thermocouple layout and the measured magnetic flux density values in a CSP thin-slab mold, the local heat flux and thin-slab solidification features in the funnel-type mold with electromagnetic braking are analyzed. The differences of local heat flux, fluid flow and solidified shell growth features between two steel grades of Q235B with carbon content of 0.19%C and DC01 of 0.03%C under varying operation conditions are discussed. The results show the maximum transverse local heat flux is near the meniscus region of over 0.3 m away from the center of the wide face, which corresponds to the upper flow circulation and the large turbulent kinetic energy in a CSP funnel-type mold. The increased slab width and low casting speed can reduce the fluctuation of the transverse local heat flux near the meniscus. There is a decreased transverse local heat flux in the center of the wide face after the solidified shell is pulled through the transition zone from the funnel-curve to the parallel-cure zone. In order to achieve similar metallurgical effects, the braking strength should increase with the increase of casting speed and slab width. Using the strong EMBr field in a lower casting speed might reverse the desired effects. There exist some differences of solidified shell thinning features for different steel grades in the range of the funnel opening region under the measured operating conditions, which may affect the optimization of the casting process in a CSP caster.

scholarly journals Performance Comparison of Solar Single-Axis Tracking Low-Concentrating Photovoltaic/Thermal System With Different Axes

IEEE Access ◽  
2021 ◽  
Vol 9 ◽  
pp. 28632-28645
Author(s):  
Yang Liu ◽  
Yong Zhang ◽  
Yang Zhao ◽  
Han Yue ◽  
Dan Gao ◽  
...  
Keyword(s):  
Performance Comparison ◽  
Thermal System ◽  
Photovoltaic Thermal System
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