Low-Cost Solar Electricity Using Stationary Solar Fields; Technology Potential and Practical Implementation Challenges to Be Overcome. Outcomes from H2020 MOSAIC Project

Abstract

At any time of the day, a spherical mirror reflects the rays coming from the sun along a line that points to the sun through the center of the sphere. This makes it possible to build concentrated solar power(CSP) plants with fixed solar fields and mobile receivers; that is, solar fields can be significantly cheaper and simpler, but challenging tracking systems for the mobile receiver need to be implemented. The cost-cutting possibilities for this technology have been under-researched. This article describes the MOSAIC concept, which aims to achieve low-cost solar energy by boosting the benefits of spherical reflectors while addressing their challenges. This new concept proposes to build large modular plants from semi-Fresnel solar bowls. One of these modules has been designed and is under construction in Spain. This article reports the main lessons learned during the design phase, describes the advantages and challenges of the concept, details the proposed routes to overcome them, and identifies the steps needed to develop a fully competitive industrial solution.

Innovative Modular Approach to High Concentration CSP Systems. Results and Achievements From the First-of-its-Kind 300 kWt Semi-Fresnel Fixed Mirror Module Prototype Up and Running

“…This article shows the first results that demonstrate how this concept makes the construction and operation of SRTA systems viable. The aperture diameter of the prototype MOSAIC solar field is 30 m and peak thermal power is close to 300 kWt [2]. The southernmost section of the concentrator has been deleted from the construction plan, and then not erected in the prototype, due to the low cost-efficiency ratio shown during the optical analysis process for the latitude where the prototype is placed.…”