动力循环中混合工质的应用研究

Research on Thermodynamic Properties of Ammonia-Water Mixtures for Power Cycles

采用沸点不同的混合物 ,由于工质吸热蒸发是变温过程 ,使热源的放热过程与混合工质的吸热过程曲线更好的配合 ,最大限度地降低传热过程中的不可逆损失 ,同时热源的放热温度可以大大降低。根据混合工质的这一特点 ,设计了以氨 -水混合物作为工质电冷联合生产的新型热力循环。该热力循环可以利用低温热源 ,如地热、低温太阳能、电厂废热等。对这一热力循环的经济性分析证明 :该系统循环效率比单一工质效率高。图 3表 2参

The variable temperature boiling of mixtures used in power cycles can improve the match of the temperature profiles for heat absorbing process in comparison to that obtained by the use of pure water. That results in the smaller loss of energy and exergy and lower outlet temperature of the primary heat source. The paper proposes a new power cycle using ammonia water mixture which can produce power and refrigerant. The new power cycle may use low temperature resources, such as geothermal, solar energy, waste heat, etc. The result shows that higher thermal efficiencies can be obtained. Figs 3, tables 2 and refs 4.