一种带中间换热器的双热源高温热泵系统

发布时间：2018-09-01 16:30

【摘要】：为了提高工业高温热泵系统的热力性能,实现对工业低温余热的高效综合回收,提出了一种带中间换热器的双热源高温热泵系统。第一级热泵以CO2为工质、以空气为热源,在超临界状态下将冷水加热到中间温度。第二级热泵以R152a(二氟乙烷)作为工质,从工业余热源吸收热量,将用水加热到所需的高温,并且在中间换热器中将CO2加热到过热状态。对该双热源热泵系统进行热力学分析,发现给定R152a在中间换热器温降的情况下,CO2存在最大的过热度,使得整个系统达到最佳运行工况。以回收50℃废水余热为例与单热源热泵进行比较,平均供水量是后者的两倍多,单位质量热水的耗功量减少43.2%,性能系数和火用效率分别平均提高41.9%和23.96%。
[Abstract]:In order to improve the thermal performance of industrial high temperature heat pump system and realize the efficient and comprehensive recovery of industrial low temperature waste heat, a double heat source high temperature heat pump system with intermediate heat exchanger is proposed. The first stage heat pump uses CO2 as working medium and air as heat source to heat cold water to intermediate temperature in supercritical state. The second stage heat pump takes R152a (difluoroethane) as working medium, absorbs heat from industrial surplus heat source, heats water to the desired high temperature, and heats CO2 to overheating state in intermediate heat exchanger. The thermodynamic analysis of the dual heat source heat pump system shows that the maximum superheat exists in the case of the temperature drop of the intermediate heat exchanger, which makes the whole system achieve the best operating condition. Taking the waste heat recovery from 50 鈩，

本文编号：2217747