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对于中高温热源,有机朗肯循环是一种高效灵活的能量回收利用方式。但在中高温热源的温度范围内,有机物可能会发生热分解,因此有机工质的热稳定性成为制约工质筛选的首要因素。HFC245fa因为其良好的热力性能和环保性,被认为是有良好应用前景的有机朗肯循环工质。本文主要对HFC245fa的热稳定性和材料相容性进行实验研究。结果表明,HFC245fa的热分解温度在300~320℃之间,且铜和铝对HFC245fa的热分解都有明显的催化作用。同时HFC245fa也会改变部分材料的物理性质,同时在材料表面产生积碳。
For medium and high temperature heat sources, organic Rankine cycle is a highly efficient and flexible energy recovery and utilization. However, in the temperature range of medium-high temperature heat source, organic matter may be thermally decomposed, so the thermal stability of organic medium becomes the primary factor restricting the selection of working fluid. HFC245fa because of its good thermal properties and environmental protection, is considered to have good prospects for the application of Organic Rankine cycle refrigerant. In this paper, we mainly study the thermal stability and material compatibility of HFC245fa. The results show that the thermal decomposition temperature of HFC245fa is in the range of 300 ~ 320 ℃, and both copper and aluminum have obvious catalytic effects on the thermal decomposition of HFC245fa. At the same time HFC245fa will change some of the physical properties of materials, while producing carbon deposition on the surface of the material.