摘要
以热泵热水技术为基础,针对目前热泵热水系统能源利用效率较低、冷凝器换热量及进出口水温差较大等缺点,提出并联冷凝式空气源热泵热水系统。针对我国南方亚热带季风气候全年水温波动较大等特点,以长沙地区为例,对并联冷凝式空气源热泵热水系统分别设计夏、冬运行模式以确保全年不同水温条件下系统能较好运行。利用工程热力学虚拟实验室CYCLEPAD建立普通空气源热泵热水系统及并联冷凝式空气源热泵热水系统模型并进行计算分析。研究结果表明:在长沙地区,相对于普通空气源热泵热水系统,并联冷凝式空气源热泵热水系统能有效分散冷凝器总换热量及降低冷凝器进出口水温差;系统在夏季工况下平均COP(coefficient of performance,性能系数)从5.10升至6.30,提升23.53%;在冬季工况下平均COP从3.69升至5.29,提升43.36%;系统在夏季工况下平均每月运行能耗从2447kW h降至1972kW h,降低19.41%;在冬季工况下平均每月运行能耗从5066kW h降至3539kW h,降低30.14%;系统全年节能效果良好,且在冬季节能效果更显著。
Based on the heat pump hot water technology,a parallel condensing air-source heat pump(ASHP)hot water system was proposed to overcome the shortcomings of the common heat pump hot water system,such as low energy efficiency,high heat transfer capacity and large water temperature difference between inlet and outlet of condenser.With consideration of the characteristics of large fluctuations of water temperature in the southern subtropical monsoon climate in China,the summer and winter operating modes of parallel condensing ASHP hot water system were designed by taking Changsha as an example to adapt the operation of the system under different water temperature conditions throughout the year.The model of common heat pump hot water system and parallel condensing ASHP hot water system were established by using the engineering thermodynamics virtual laboratory CYCLEPAD.The results show that in Changsha,compared with the common ASHP heat pump hot water system,the parallel condensing ASHP hot water system can effectively disperse the total heating capacity and reduce the water temperature difference between inlet and outlet of condenser.The parallel condensing ASHP hot water system average COP in summer condition increases from 5.10 to 6.30 by 23.53%.The average COP in winter condition increases from 3.69 to 5.29 by 43.36%.The average operating energy consumption in summer condition decreases from 2 447 kW·h to 1 972 kW·h by 19.41%.The average operating energy consumption in winter condition decreases from 5 066 kW·h to 3 539 kW·h by 30.14%.The energy-saving effect of the system is excellent especially in winter.
作者
江轶政
曾志勇
毕麟
刘益才
JIANG Yizheng;ZENG Zhiyong;BI Lin;LIU Yicai(School of Energy Science and Engineering,Central South University,Changsha 410083,China)
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2019年第9期2310-2316,共7页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(21506257,51776226)~~
关键词
热泵热水系统
并联冷凝
COP
heat pump hot water system
parallel condensation
COP
