再热除湿热泵系统全工况实验研究

【作者】 赵辉；

【导师】 李应林；

【作者基本信息】 南京师范大学 ， 建筑与土木工程（专业学位）， 2020， 硕士

【摘要】 某地下工程中进风温湿度比较特殊,传统除湿机无法实现对室内进风温湿度的自由控制,不能完成地下工程温湿度自由调节的任务。为完成某地下工程同时调节温度和除湿的任务,本文研究出一款新型再热除湿热泵系统,应对不同的进风工况和出风温湿度要求,此系统提供了四种运行模式,分别是:降温除湿模式、升温除湿模式、调温除湿模式以及制热模式。此新型除湿热泵系统不仅解决了传统冷却除湿系统只能降温除湿,无法实现对空气温湿度自由控制的局限性问题,还为传统冷却除湿系统的应用提供了新的思路。通过搭建再热除湿热泵系统实验机组,本文分别对降温除湿模式、升温除湿模式、调温除湿模式以及制热模式等四种运行模式共22种工况进行了实验。首先,对22组实验分别进行了出风效果和能效分析。测试结果显示,再热除湿热泵系统运行降温除湿和调温除湿模式时,可以获得理想的出风效果,与设计计算结果相符,满足地下工程的要求,但是能效较低。升温除湿模式和制热模式,出风温度较设计计算偏低,但是提高压缩机频率则可以达到理想的出风温度要求,系统COP可达6.32,SMER可达5.59kg/(h·k W)。其次,对影响系统出风效果和能效的各关键运行因素进行了细致的分析,采用控制变量法,改变进风风量、进风温度、进风湿度、压缩机频率、冷媒三通比例调节阀开度等五个关键运行工况参数,探究工况的变化和机组运行参数对系统性能的影响。测试结果显示,风量、进风温度、进风湿度、压缩机频率的变化会影响出风温度、出风湿度、制冷量、制热量、除湿量、系统COP和SMER。冷媒三通比例调节阀开度的变化会影响出风温度和再热量。更多还原

【Abstract】 The air inlet temperature and humidity in an underground project is quite special.The traditional dehumidifier cannot realize the free control of air temperature and humidity,and cannot satisfy the task of free adjustment of temperature and humidity in an underground project.For underground engineering to adjust the temperature and moisture tasks at the same time,this paper studies a new type of reheat desiccant heat pump system,the outlet air temperature and humidity to cope with different inlet air conditions and requirements,the system provides four kinds of operation mode,respectively is: cooling dehumidification mode,dehumidifier,temperature modulated mode,the mode of temperature and heating mode.The new dehumidification heat pump system not only solves the limitation that the traditional cooling dehumidification system can only cool down and dehumidify,but cannot realize the free control of air temperature and humidity,but also provides a new idea for the innovative development and application of the traditional cooling dehumidification system.Through the establishment of a reheat dehumidification heat pump system test unit,this paper has carried out experiments on 22 working conditions of four operating modes,namely,cooling dehumidification mode,heating dehumidification mode,temperature regulating dehumidification mode and heating mode.The test results show that when the reheat dehumidification heat pump system runs the cooling dehumidification and temperature regulating dehumidification modes,the ideal wind output effect can be obtained.In the heating dehumidification mode and heating mode,the air outlet temperature is lower than the design and calculation.However,if the frequency of the compressor is increased,the ideal air outlet temperature can be reached.The COP of the system can reach 6.32,and the SMER can reach 5.59kg/(h· k W).Followed by affecting the system out of the wind effect and energy efficiency of key operation factors has carried on the detailed analysis of the control variable method is adopted,the change of temperature of the intake air volume,into the wind,the air humidity,frequency of compressor,refrigerant tee proportioning valve five key operation parameters,such as unit to explore the change of working condition and the influence of operation parameters on the system performance.The test results show that the air volume,air inlet temperature,air inlet humidity and compressor frequency will affect the air outlet temperature,air outlet humidity,cooling capacity,heat production,dehumidification capacity,COP and SMER of the system.The change of opening degree of refrigerant tee proportional regulating valve will affect the outlet temperature and reheat.更多还原