基于吸收-压缩新型热泵循环变工况性能分析

Performance Analysis of New Type of Heat Pump under Varying Cycle Conditions Based on Absorption-compression

针对常规热泵在工业余热回收领域的应用缺陷,该研究针对一种压缩式与吸收式循环深度耦合的新型热泵,用于直接回收工业余热制取高温热水。研究首先介绍了耦合热泵循环的运行原理,其次建立了耦合热泵的热力学模型,最后计算分析了压缩式冷凝、蒸发温度及余热水出口温度对耦合热泵性能的影响。在设计工况下,回收75℃的余热水,耦合热泵可将高温热水由90℃加热至135℃,且COP可达到1.75,显著提高了常规热泵的工作范围,研究结果为该机组设计和运行提供了依据。

Aiming at the application defect of conventional heat pump in the field of industrial waste heat recovery, this study aims at a new type of heat pump with deep coupling of compression and absorption cycle, which is used to directly recover industrial waste heat to produce hot water of high temperature. Firstly, we introduced the operation principle of the coupled heat pump cycle. Then the thermodynamic model of the coupled heat pump was established. Finally, we calculated and analyzed the effects of compression condensation, evaporation temperature and outlet temperature of residual hot water on the performance of the coupled heat pump. Under the design condition, when 75 ℃ surplus hot water is recovered, the coupling heat pump can heat the high-temperature hot water from 90 ℃ to 135 ℃, and the COP can reach 1.75, which significantly improves the working range of the conventional heat pump. The research results provide a basis for the design and operation of the unit.