Reverse Electrodialysis Heat Engine (REDHE) is a promising technology to convert waste heat at temperatures lower than 100 °C into electric power. In the present work an overview of the possible regeneration methods is presented and the technological challenges for the development of the RED Heat Engine (REDHE) are identified. The potential of this power production cycle was investigated through a simplified mathematical model. In the first part of the work, several salts were singularly modelled as possible solutes in aqueous solutions feeding the RED unit and the corresponding optimal conditions were recognized via an optimization study. In the second part, three different RED Heat Engine scenarios were studied. Results show that power densities much higher than those relevant to NaCl-water solutions can be obtained by using different salts, especially those based on lithium ion (i.e. LiBr and LiCl). Results on the closed loop show efficiencies up to about 15% corresponding to an exergetic efficiency of about 85%, thus suggesting that the RED Heat Engine could potentially be a promising technology, with applications mainly in the industry where low-grade heat that has no alternative use can be converted into electricity.

反向电渗析热机（REDHE）是一种有前途的技术，可以将温度低于100°C的废热转化为电能。在本工作中，对可能的再生方法进行了概述，并指出了开发RED Heat Engine（REDHE）的技术挑战。通过简化的数学模型研究了该发电周期的潜力。在工作的第一部分中，将几种盐作为可能的溶质在RED单元中进行了唯一建模，并通过优化研究确定了相应的最佳条件。在第二部分中，研究了三种不同的RED热机方案。结果表明，使用不同的盐可以获得比NaCl水溶液高得多的功率密度，特别是那些基于锂离子的物质（即LiBr和LiCl）。闭环上的结果表明效率高达15％，对应的能量效率约为85％，这表明RED Heat Engine可能是一种有前途的技术，其应用主要用于没有热量的低等级热量的行业替代用途可以转化为电能。