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。
Organic Rankine Cycle (ORC) was a suitable promising technology for the mid-and high-grade heat energy. Organic working fluids decomposed at high temperatures. The thermal stability of the organic working fluids was the primary condition for the selection of fluids. HFC245fa was considered as the potential selection because of its good thermal performance and environmental benefit. The main work of this paper was the experimental study for the thermal stability and material compatibility of HFC245fa. The results showed that HFC245fa decomposed at 300-320℃ after a 100h experiment period. Copper and aluminum had good catalytic effect on the reaction. And HFC245fa changed mechanical property of some materials. Carbon deposition was found on the material surface.