一种实现热量梯级利用的新型高温热泵系统
Novel high temperature heat pump system with thermal cascade utilization
摘要：
该设备可实现工业余热梯级利用，工作原理为：第一级以CO2为工质进行超临界循环将冷水加热到中间温度，第二级以R152a（二氟乙烷）为工质进行亚临界循环将水加热到高温。建立了系统模型，并进行计算与分析。结果表明，无论要求热泵系统最高冷凝温度相同还是出水温度相同，梯级热泵系统都可以实现比单级系统更优越的性能；在余热源工况相同的情况下，设置供水温度相同时，梯级热泵系统各项性能参数均优于跨临界循环CO2热泵系统。
Abstract：
The device can realize thermal cascade utilization of industrial waste heat, and its working principle is as the following: the water is heated to high temperature by two stages, firstly it is heated to the intermediate temperature by CO2 at the supercritical state, and then is heated to high temperature by R152a at the subcritical state. Develops a system model, calculates and analyses the system performance. The results show that the cascade heat pump system has better performance than a single-stage system whether under the condition of same highest condensing temperature of heat pump system or the same temperature of water supply, and that the performance of cascade heat pump system is better than transcritical CO2 heat pump system under the same waste water source condition and same water supply temperature.
Keywords:wasteheatrecovery,hightemperatureheatpump,thermalcascadeutilization,thermodynamicanalysis,performancecomparison