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This paper focuses on the analysis of the complementary energy losses of a gas to gas heat exchanger using an intermediate medium with high thermal capacity to transfer heat between two gas streams at different pressure. In fact, such a heat exchanger requires two mechanical devices, namely a pressurization system capable of transferring the particles from a low pressure to a high pressure environment, and a depressurization system, for the inverse procedure. The operating procedures of these two key components are presented in detail and a simple zero-dimensional approach is also proposed to model both systems. A numerical analysis, based on the same zero-dimensional model, is performed in order to evaluate all energy losses related to the pressurization and depressurization procedures. A further energy loss is analysed, in particular the one related to the energy absorbed by the conveyor employed to deliver back the particles from the bottom to the top of the plant in order to realize a continuous operation mode.

Analysis of the complementary energy losses of a high temperature gas to gas heat exchanger based on a solid intermediate medium