动力循环中混合工质的应用研究

Thermodynamic Cycles Using Ammonia-water Mixtures

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,最大限度降低传热过程不可逆损失,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,它可以利用低温热源。经济性分析证明,该系统循环效率比单一工质效率高。

The variable-temperature boiling of mixtures in power cycles can improve the match of temperature profiles for heat absorbing process in comparison to that obtained by the use of pure water. The results are the smaller loss of energy and exergy and low outlet temperature of primary heat source. A new power cycle using ammonia-water mixture can produce power and refrigerant is proposed. The new power cycle may use low temperature resources. The result shows that higher thermal efficiencies can be obtained.