两级氨水再吸收储热系统热力学动态特性分析

Thermophysical and Dynamic Analysis of Two-stage Ammonia-waterAbsorption-resorption Heat Storage System

本文构建了一种以氨水为工质的两级再吸收浓度差储热系统,并对该系统进行热力学动态性能分析。由于采用二元溶液吸收过程代替一元工质冷凝过程,循环的驱动热源温度能够有效降低,在热源温度为90℃时两级再吸收循环COP可达0.489.对于两级再吸收循环,研究热源温度,回水温度对储热效率的影响。储热终了时间随热源温度80℃增加为130℃从4.5 h缩短为1 h。

This article constructs a two-stage reabsorption concentration difference heat storage system using ammonia water as the working fluid,and conducts thermophysical and dynamic performance analysis of the system.Due to the use of a binary solution absorption process instead of a single refrigerant condensation process,the driving heat source temperature of the cycle can be effectively reduced,and the COP of the two-stage reabsorption cycle can reach 0.489 at a heat source temperature of 90℃.For the two-stage reabsorption cycle,the effects of heat source temperature and return water temperature on heat storage efficiency are studied.The end time of heat storage decreased from 4.5 hours to 1 hour as the temperature of the heat source increased from 80℃ to 130℃.