*Article* **Solar Tower Power Plants of Molten Salt External Receivers in Algeria: Analysis of Direct Normal Irradiation on Performance**

**Abdelkader Rouibah 1, Djamel Benazzouz 1, Rahmani Kouider 2, Awf Al-Kassir 3, Justo García-Sanz-Calcedo 3,\* and K. Maghzili <sup>4</sup>**


Received: 3 July 2018; Accepted: 17 July 2018; Published: 25 July 2018

**Abstract:** The increase of solar energy production has become a solution to meet the demand of electricity and reduce the greenhouse effect worldwide. This paper aims to determine the performance and viability of direct normal irradiation of three solar tower power plants in Algeria, to be installed in the highlands and the Sahara (Béchar, El Oued, and Djelfa regions). The performance of the plants was obtained through a system advisor model simulator. It used real data gathered from appropriate meteorological files. A relationship between the solar multiple (*SM*), power generation, and thermal energy storage (*TES*) hours was observed. The results showed that the optimal heliostat field corresponds to 1.8 *SM* and 2 *TES* hours in Béchar, 1.2 *SM* and 2 *TES* hours for El Oued, and 1.5 *SM* and 4 *TES* hours for Djelfa. This study shows that there is an interesting relationship between the solar multiple, power generation, and storage capacity.

**Keywords:** solar tower power plants; direct normal irradiation; energy projects; system advisor model
