基于Aspen Plus的吸收式热泵性能指标影响因素研究

Influencing Factors of Performance Index of Absorption Heat Transformer

为了研究第二类吸收式热泵在余热回收中关键性能指标的影响因素,有效提高系统性能系数(coefficient of performance,COP),利用流程模拟软件aspen plus建立了第二类吸收式热泵热力系统模型,研究了第二类吸收式热泵性能评价指标温升能力ΔT、放气范围ΔX和性能系数COP与蒸发温度、蒸发压力、发生压力的关系。结果表明,温升能力ΔT随着高压的升高而增加,随着低压的升高而减小;放气范围ΔX随着蒸发温度的提高线性增长,随着发生压力的提高而减小;性能系数COP随着蒸发温度的升高逐渐增大,随着蒸发压力的提高先升高然后略有下降,随着发生压力的提高而下降,下降趋势逐渐增强。因此在保证一定驱动热源温度的情况下,降低发生压力、增大系统内高低压差是有效提升温升、增大放气范围、提高COP的方法。

An absorption heat transformer(AHT)thermal system model was established by using the process simulation software aspen plus.The relationship among the evaporation temperature,evaporation pressure,generation pressure,and main performance evaluation index of AHT,such as the temperature liftΔT,the deflation rangeΔX,and the coefficient of performance(COP)was studied.Results showed that the temperature liftΔT increased with rising evaporation pressure,and decreased with rising generation pressure.The deflation rangeΔX increased linearly with rising evaporation temperature and decreased with rising generation pressure.The COP increased with the rising evaporation temperature gradually.It increased at first and then decreased slightly with the rising evaporation pressure.It decreased with the rising generation pressure,and the downward trend gradually increased.For a given driving heat source temperature,reducing the generation pressure to increase the pressure difference in the system was an effective method to increase the temperature lift,the deflation range,and the COP.