NEW FORMULATIONS OF NITRATE SALTS FOR USE AS FLUID FOR THE STORAGE AND TRANSFER OF HEAT
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United States of America Patent
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Aug 16, 2018
app pub date -
Mar 16, 2015
filing date -
Jan 15, 2015
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Abstract
The invention relates to the innovative formulation of mixtures of nitrate salts, the composition of which is fundamentally based on strontium nitrate and other alkaline metal nitrates. These salts, according to the invention, produce an eutectic mixture with a meting point lower than 210° C., in a ternary formulation and the decomposition thereof occurring at a temperature greater than 00° C. In addition, other non-eutectic compositions are provided for the purpose of adapting their melting point to the different applications if considered necessary. Furthermore, this ternary formulation is more competitive than the existing formulations from an economic point of view. This formulation of salts has a direct application as a heat storage fluid, as well as a vehicle for heat transfer, being suitable for heat accumulation and transmission systems in thermosolar centres, as well as in any other application requiring temporary storage of thermal energy and the subsequent transfer thereof. The main provision of this invention is a fluid that can maintain its liquid state for a more prolonged period and at a temperature lower than the existing formulations, without the need to provide external heat and ensuring the stability of same at more elevated temperatures.
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