曾宪阳,马一太,李敏霞,刘圣春
ZENG Xian-yang,MA Yi-tai,LI Min-xia,LIU Sheng-chun (Tianjin University

• 1:天津大学
• 2:天津大学
• 3:天津大学
• 4:天津大学 天津300072

摘要(Abstract)：

从CO2跨临界循环的热力学特性分析入手,给出CO2热泵干燥系统的两种形式,并对系统进行评价和分析。结果表明,CO2跨临界循环能够实现与干燥介质(空气)良好的温度匹配,热泵循环的COP达5.1~5.7,系统的单位除湿率SMER达2.86~3.20kg/(kW.h)。CO2热泵干燥系统的火用损失主要发生在压缩、除湿、空气加热和节流的过程中,减少干燥过程中的火用损失,应主要从这几方面进行优化。
Based on the analysis of the thermodynamic characteristics of CO_2 transcritical cycle,two kinds of CO_2 transcritical heat pump drying system were presented,and thd systems were evaluated and analyzed.The results show that heat rejection process of CO_2 transcritical cycle has a good temperature matching with drying medium(air),the coefficient of performance(COP) of the heat pump cycle reaches 5.1～5.7,and the specific moisture extraction rate(SMER) of the system reaches 2.86～3.20 kg/(kW·h).The losses of exergy of CO_2 transcritical heat pump drying systems mainly exist in the processes of compression,dehumidification,air heating and throttling,which indicate the optimized direction to decrease the losses of exergy in the drying process.

关键词(KeyWords)： 二氧化碳;热泵干燥;跨临界循环;火用损失
carbon dioxide;heat pump drying;transcritical cycle;loss of exergy

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(50476060)

作者(Author): 曾宪阳,马一太,李敏霞,刘圣春
ZENG Xian-yang,MA Yi-tai,LI Min-xia,LIU Sheng-chun (Tianjin University

参考文献(References)：

• [1]Zuhal Oktay,Arif Hepbasli.Performance evaluation of aheat pump assisted mechanical opener dryer[J].EnergyConversion and Management.2003,(44):1193-1207.
• [2]王以清.节能环保型热泵干燥装置[J].能源工程.2000,(5):25-26.
• [3]马一太,魏东,王景刚.国内外自然工质研究现状与发展趋势[J].暖通空调,2003,33(1):41-46.
• [4]Schmidt E L,Klocker K,Flacke N,et al.Applying thetranscritical CO2process to a drying heat pump[J].Int JRefrig,1998,21(3):202-211.
• [5]Klocker K,Schmidt E L,Steimle F.Carbon dioxide as aworking fluid in drying heat pump[J].International Jour-nal of Refrigeration.2001,(24):100-107.
• [6]文键.二氧化碳热泵干燥系统的研究[D].西安:西安交通大学,2002.
• [7]魏东,马一太,吕灿仁.CO2跨临界循环热泵干燥系统的理论研究[J].天津大学学报,2002,(35):5-8.
• [8]李敏霞,马一太,芦苇,等.CO2跨临界循环特性对热泵干燥系统的影响[J].化学工程.2004,32(3):1-5.
• [9]王侃宏.CO2跨临界循环的理论分析与实验研究[D].天津:天津大学,2000.
• [10]Klein S A.Engineering Equation Solver[Z].AcademicProfessional V7.270(11/21/04).