利用电压缩制冷循环的盐溶液蓄冷系统特性研究  

Study on Salt Solution Cold Storage System With Electric Compression Refrigeration Cycle

作　　者：曹艺飞 王林[1] 王占伟 李修真 袁鑫森 连梦雅 CAO Yifei;WANG Lin;WANG Zhanwei;LI Xiuzhen;YUAN Xinsen;LIAN Mengya(Institute of Building Energy and Thermal Science,Henan University of Science and Technology,Luoyang 471023,China)

机构地区：[1]河南科技大学建筑能源与热科学技术研究所,洛阳471023

出　　处：《工程热物理学报》2022年第6期1478-1484,共7页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51876055);河南省高校科技创新团队(No.22IRTSTHN006);河南省高校科技创新人才(No.22HASTIT025)。

摘　　要：针对中央空调用冰蓄冷系统存在制冷机组效率较低及初投资过高的问题,本文提出一种利用电压缩制冷循环的盐溶液蓄冷系统,由电压缩制冷循环和盐溶液蓄能循环复叠组成,其特点在于电压缩制冷循环所制取冷量通过盐溶液浓缩分离过程实现冷量储存,然后浓溶液吸收水蒸气实现冷量释放,实现冷量的谷蓄峰用,有助于电力削峰填谷。建立了新系统热力学数学模型,分析蓄冷阶段电压缩制冷循环和盐溶液浓度对新系统循环特性及储罐容积的影响,并评估其经济性。研究表明,新系统综合性能和经济性优于传统冰蓄冷系统。在供冷量300 kW设计工况下,新系统较传统冰蓄冷系统综合性能系数(CCOP)提高10.96%,每小时所需储罐容积降低39.49%,且生命周期内新系统的总投资比传统冰蓄冷系统降低17.97%。Focusing on the problems of low efficiency and high initial investment of refrigeration unit in ice storage system for central air conditioning,a cold storage system with salt solution by electric compression refrigeration cycle is proposed in this paper,which consists of an electricitydriven compression refrigeration cycle(ERC)and a salt solution energy storage cycle(SEC).Its feature is that the cooling capacity produced by the electric compression refrigeration cycle is stored through the salt solution concentration difference,and the concentrated solution absorbs water vapor to release the cooling capacity for space cooling.In this way,the at-power-valley storage and atpower-peak use of cooling capacity can be realized,which is beneficial to peak-cutting and valleyfilling of the power grid.Based on the thermodynamic model,the influences of the ERC and salt solution concentration on the novel system performance and storage tank volume is analysed,and the economy of the proposed system is compared with the ice storage system.The results show that the comprehensive performance and economy of the new system are better than those of the conventional ice storage system.Under the given design condition of 300 kW cooling capacity,the comprehensive performance coefficient(CCOP)of the new system is 10.96%higher than that of the conventional ice storage system,and the required storage tank volume per hour is reduced by 39.49%,while the total investment of the new system during the life cycle is 17.97%lower than that of the conventional ice storage system.

关 键 词：盐溶液蓄冷 电压缩制冷 循环特性 综合性能系数 经济性评估 

分 类 号：TK123[动力工程及工程热物理—工程热物理]