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Various projects have been developed to use solar energy and some of them are in the course of developing all around the world. In Iran a 250 kW pilot solar power plant is constructed using parabolic trough collectors from 2001 to 2006. Results of thermal tests of the plant leads to the generation of steam with 250 P o P C temperature and 2 MPa pressure. Based on several years of experiments (from 2006-2010) it is decided to expand the solar thermal power rate to produce 500 kW electricity by combining the present system with a larger size collector and an auxiliary boiler. This article, explains the thermal design of the new collector and then various design options for combination of the new collector to the present plant have been studied and the most practical method of producing 500 kW is selected applying first law of thermodynamics utilizing a hybrid system.

There are many applications for solar energy from which the solar thermal utilization has received great consideration in the past decades. Among various solar systems, electricity generation is studied and several commercial plants around the world have been installed. In Iran for the first time an investigation is made to find possible applications of solar energy to construct the first 250 kW solar power plant in Shiraz. The plant is designed to generate electricity continuously to be feed to the national grid. For such plant a hybride-Rankine system which contains two cycles of hot oil and steam is selected. The collectors used are parabolic trough 25 m length, 3.4 m wide with 0.88 m focal length. Previous studies of the oil cycle and steam cycle is carried out for certain design conditions. Based on the limitation of construction, it was found that a new simulation is needed to find out the effect of heat exchangers performances on the overall power plant electricity generation rate. Regarding new conditions, the daily and yearly performance of the power plant is determined and results are compared with initial analysis. It is found that the system performances can be improved with new set point design conditions.

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