Optical designs and concentration characteristics of a linear Fresnel reflector solar concentrator with a triangular absorber

Influence of circumferential solar heat flux distribution on the heat transfer coefficients of linear Fresnel collector absorber tubes

“…The study showed that the heat flux distribution was highest at the bottom of the outer surface of the absorber tube followed by the sides and abated contribution came from the top. The studies by Goswami et al(1990) and Mathur et al (1991) also showed that flux distribution on the outer-wall surface of the absorber tube had a peak at the central portion from underneath and decreased rapidly on both sides of the tube. The studies recommended that the unirradiated portion of the absorber tube should be insulated to reduce thermal losses.…”

“…The plant size ranges from 30 MW to 80 MW and a total installed capacity of 354 MW e , which feeds about 800 million kWh per year into the grid and displaces more than 2 million barrels of oil per year (Abbas et al 2012), (Grena2010), (Krothapalli and Greska , nd). Another important linear concentrator, which has received considerable attention for both industrial process heat applications and electric power generation, is the linear Fresnel concentrator (Goswami et al 1990). Unlike parabolic solar collectors, it does not require rotating joints and metal-glass welding at the ends of each receiver tube (Abbas et al 2012) and has low maintenance and operation costs.…”

“…1 consists of arrays of linear mirror strips, which track the sun in a single axis and concentrate the solar radiation on the receiver cavity mounted on the horizontal tower. Each mirror element is tilted such that normally incident solar radiation, after reflection from the mirror element, impinges on the absorber tube placed along the length of the focal zone of the concentrator (Goswami et al 1990). The receiver consists of a compound parabolic cavity with a second-stage concentrator and a single large diameter absorber tube mounted inside the cavity covered with a transparent glass.…”

A Direct-Steam Linear Fresnel Performance Model for NREL’S System Advisor Model

“…Models used to predict the performance of LF concentrators and receivers have been developed by Goswami, et al [4], Abbas, et al [5,6], Facão, et al [7], Flores-Larsen, et al [8], and by a group at the University of New South Wales, Australia, in vestigating the behavior of trapezoidal cavity receivers [9,10], as illustrated in Figure 1. These papers led the way in establishing the thermal performance of LF receivers and reflectors but do not focus on providing annual simulation tools for techno-economic analysis.…”

“…The final thermal loss coefficient evaluated at each calculation node in the field is shown in Eq. [4].…”