Estimation of Dust Accumulation in Parabolic trough Concentrators using Aerial Laser Reflection
Abstract
Solar thermal energy has a high capacity to supply a large part of the planet's energy demand. However, it is necessary to increase its efficiency and performance, as well as improve operation and maintenance (O&M) processes; since these systems are strongly affected by dust deposition, mainly parabolic trough plants. This work analyzes the deposition of dust on the transparent covers of the absorber tubes of parabolic trough collectors and the energy loss associated with it. An optical methodology is developed based on analyzing transmittance of the receiver in different dirt scenarios using a point laser and subsequently, the reflectance of a linear laser on the transparent cover of the absorbent tube captured by a camera mounted on an aerial vehicle; thus relating the luminous intensity to the amount of dust deposited and establishing an energy loss criterion.