Entropy production minimization of a CRHP.

Compression resorption heat pumps (CRHP) are a promising option to upgrade waste heat from industry. One way to optimize a CRHP is by minimizing the entropy production rate of the heat pump; that is to minimize the lost work of the system. In this paper a CRHP operating with an ammonia-water mixture is analysed based on an application case from the chemical industry. First, a global approach is used to analyse the entropy production rate of each of the components in the heat pump cycle. Based on the result from the global approach the component with the maximum energy dissipation in the heat pump is identified, in this case the resorber. The resorber is therefore further analysed with a detailed thermodynamic state model and entropy production is calculated using the theory of non-equilibrium thermodynamics. Measures to reduce the non-uniformity of the entropy production are then proposed based on the theory of equipartition.压缩吸收式热泵（Compression Resorption Heat Pump, CRHP）是实现工业余热提质升级的极具应用前景的技术路径。优化CRHP的核心思路之一是降低热泵的熵产率，即最小化系统的损失功。本文依托某化工行业应用案例，对以氨水溶液为工质的CRHP展开分析研究：首先采用全局分析法解析热泵循环各部件的熵产率，基于该全局分析法的结果识别出热泵中能量耗散最为显著的部件——吸收器；随后针对该吸收器，通过精细化热力学状态模型开展深入分析，并借助非平衡热力学理论计算其熵产量；最后基于熵产均分理论，提出了降低熵产非均匀性的优化措施。