Molten Salt Parabolic Trough System with Synthetic Oil Preheating

Molten salt parabolic trough system (MSPT), which can heat the heat transfer fluid (HTF) to 550 degrees C has a better performance than a synthetic oil parabolic trough system (SOPT), which can heat the HTF to 400 degrees C or less. The utilization of HTF at higher temperature in the parabolic trough system is able to realize the design of a smaller size of storage tank and higher heat to electricity conversion efficiency. However, with MSPT there is a great amount of heat loss at night so it is necessary to circulate the HTF at a high temperature of about 290 degrees C in order to prevent solidification. A new MSPT concept with SOPT preheating (MSSOPT) has been developed to reduce the heat loss at night. In this paper, the MSSOPT system, its performance by steady state analysis and annual performance analysis are introduced.