a b s t r a c tThe enhancements in the storage systems developed by solar thermal power plants have provided to renewable energy a considerable increase in efficiency. Thermal Energy Storage (TES) using HITEC mixture could be used as Heat Transfer Fluid (HTF) in concentrated solar linear technology.In this research, the corrosive effects of HITEC mixture composed by 40 wt% NaNO 2 þ 7 wt % NaNO 3 þ 53 wt% KNO 3 were assessed at 390 C on a carbon steel (A516) and on low-Cr alloy steels (T11 and T22). The corrosion rates were determined by gravimetric tests, measuring the weight gain during 2000 h, identifying the corrosion products via scanning electron microscopy and X-ray diffraction. T22 steel shows a corrosion layer of 6.05 microns, with a protective layer formed in the inner zone to the material, identified through DRX as the K 2 CrO 4 protective spinel.Fe 2 O 3 and MgO were the others important products found on the tests performed at 390 C, being observed also the formation of some stable compounds with the impurities of the salt, as carbonates.The use of the HITEC mixture in solar technology would provide a less aggressive behaviour for materials in contact with it, providing an increase in operational life cycles in current solar technology.
Abstract-The behaviour of DC Load-ow formulations when they are used in economic dispatch and nodal pricing models is discussed. It is demonstrated that non-negative prices in these models are suf cient to guarantee global optimality of any local optimum, even if the feasible region is not convex, and so a negative nodal price is an indicator of a possible loss in optimality. It is also discuss the possible effect that negative prices might have on algorithms that assume this convexity.
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