Performance Analysis on Different Thermal Storage Systems for Dish Type Solar Power with Direct Steam Generation.

Considering that the dish-Stirling solar thermal power system is unable to run continuously and steadily due to the lack of energy storage capacity, a dish type direct steam generation solar thermal power system with thermal energy storage was proposed. According to the demand of power generation capacity, we designed two kinds of sensible heat storage systems (i. e., two-tank molten salt storage, single-tank thermocline storage) and two latent heat storage system (i.e., two-tank latent heat storage system and single-tank latent heat storage system). Based on the principles of heat transfer, thermodynamics, and economics, the thermal storage performance of four kinds of heat storage systems is compared and analyzed. The results show that the two-tank latent heat storage system has the best heat storage performance, and its exergy efficiency is 77.67%. In terms of economy, the two-tank latent heat storage system has the lowest cost, and the single-tank latent rank the second, and the cost of the two-tank molten salt storage system is the highest. In two aspects of thermodynamic performance and economy, the two-tank latent heat storage system is recommended in the dish type solar power with direct steam generation. [ABSTRACT FROM AUTHOR]