Solar energy application for LFR unit with trapezoidal cavity receiver considering radiative mode

Abstract

In current article, influence of radiation and convection modes on behavior of air inside an absorber in trapezoidal shape has been investigated. Such cavity is part of Linear Fresnel Reflector (LFR) unit and it is important to analyze such geometry to reach higher performance. Properties of carrier fluid were assumed as function of temperature. To involve radiation effect, discrete ordinates model was implemented. Influences of external convective factor (hext), Angle of adiabatic wall (θ), temperature ratio (Tr) on irreversibility and heat transfer were depicted in outputs. Augment of Tr, θ and hext cause incident radiation to decline about 85.95%, 20.97% and 20.68% with assuming lowest values of other factors. Strength of eddy, temperature difference augments about 180% and 9.77% when θ enhances at Tr = 0.8. With considering highest level of other factors, as values of wind speed and θ intensify, Nu enhances 9.28% and 17.36% while it declines about 52.2% with rise of Tr. Given minimum values of other parameters, irreversibility intensifies about 45.45% and 8.3% with augment of hext and θ but it declines about 84.44% with augment of Tr.

Design and characterization of MoO3/In2Se3heterojunctions as terahertz/gigahertz band filters suitable for visible light communications and 3G/4G technologies

“…The evaporation rate for In 2 Se 3 was ∼24 -Å s . 1 The surface roughness of the films was measured vial roughness monitor/profilometer (SOLID IN II). The metallic point contacts on the surface of MoO 3 /In 2 Se 3 layers were prepared with the help of a bar-like masks of areas of 0.2´0.7 cm 2 .…”

“…Recent technology developments are associated with many varieties including renewable energy [1,2], computer based information technology sectors [3], 3-D printing technology [4] and communication technology sectors [5]. Communication technology occupies important roles in almost every field of human operation such as education sectors, medical field, banking sectors, agricultural sector and field of engineering [6].…”

Optical Performance Comparison of Different Shapes of Cavity Receiver in the Fixed Line-Focus Solar Concentrating System

“…They concluded that the heat loss reduction rate varied from 6.36% to 13.55% when turning off the movable cover was applied. Ebrahimpour et al [8] investigated the influence of radiation and convection modes on the behavior of air for linear Fresnel reflector (LFR) with trapezoidal cavity receiver. Temperature difference augments about 180% when adiabatic wall angle enhances as temperature ratio is 0.8.…”

Influence of EHD on transportation of ferric water nanofluid within permeable space

“…Scientists have tried to improve novel methods to grow the rate of heat transfer in heat mechanisms, resulting in grown performance of the thermal mechanisms, decreased fuel consumption and also economic benefits [1][2][3][4][5][6][7][8][9][10][11][12]. Nonetheless, it is obvious that the addition of nanopowders to typical fluids results in profound augmentation in heat conductivity.…”