基于非常温溶液除湿的新型复合型空调系统研究
发布时间：2018-08-13 08:26
【摘要】：随着建筑功能的多元化和人员密度的不断提升,建筑能耗占国民经济总能耗的比例将达到30%左右,空调系统能耗则占到建筑物总能耗的50%以上,因此降低空调系统的能耗对提高全社会能源使用效率具有重要意义。当前普遍使用的空调系统由于其自身结构和在空气处理方式上的缺陷,消耗了大量的电能并造成了较严重的环境污染问题,因此开发节能环保的空调系统显得越发紧迫和具有实际意义。本文提出了一种基于非常温溶液除湿的热泵驱动自主再生复合型空调(HPLD-SR)系统,采用理论与实验研究相结合的方法对溶液除湿与再生过程的传热传质特性,以及系统整体的性能进行了深入分析。首先,完成了HPLD-SR系统的设计并搭建了其综合性实验测试平台。HPLD-SR系统由溶液除湿／再生循环和热泵循环耦合而成,应用低温低浓度的溶液处理空气,使用冷凝热作为再生热源。系统中溶液循环的特点为采用除湿／再生自循环和级间交换循环的设计模式,实现了溶液浓度的梯级利用；热泵循环的特点为冷凝热由串联连接的溶液冷凝器和空气冷凝器共同处理,实现了冷凝热的高效利用。其次,对低温低浓度溶液除湿过程进行了实验和理论研究。通过实验研究分析了进口空气和溶液参数对该过程传热传质性能的影响,利用实验数据总结出了描述该过程热质传递特性的经验关联式。理论研究的内容包括：对描述空气与溶液直接接触过程的NTU-Le模型进行了推导与修正；提出了一种计算除湿／再生过程耦合传热传质系数的新方法。再次,对冷凝热利用溶液再生过程进行了实验和理论研究。通过变工况实验掌握了热空气／热溶液这种再生方式的性能特点,总结了该过程的传热传质经验关联式,为后续理论分析奠定了基础。提出了冷凝热再生利用率的概念,并指出了HPLD-SR系统的冷凝热再生利用率范围。从冷凝热再生利用率、平均传质驱动力、可及处理区域等方面对比了三种不同的冷凝热利用再生模式,总结出了冷凝热再生的热量优化分配原则。另外,从溶液再生能级的角度分析了系统中除湿过程采用低浓度溶液的优势。最后,对HPLD-SR系统的整体性能和热力学特性进行了实验和理论分析,并利用有效能分析方法对系统进行了优化。通过实验研究,分析了自身可控制参数和环境参数对系统性能的影响,同时验证了机组的环境适应性。建立了整个系统的数学模型,为理论分析计算提供了条件。随后采用理论和实验相结合的方式深入揭示了系统溶液浓度平衡和能量变化之间的匹配关系。通过与传统空调系统和相关国家标准的比较,明确了HPLD-SR机组的节能特性。在此基础上,提出了一种溶液(?)计算的新方法,并建立了一套完整的系统有效能分析数学模型。随后利用上述模型对空气处理和溶液再生过程的流程,以及系统整体形式进行了优化分析,并对机组中主要设备的节能潜力进行了探讨。
[Abstract]:With the diversification of building functions and the increasing density of people, the building energy consumption will account for about 30% of the total energy consumption of the national economy, while the energy consumption of air conditioning system will account for more than 50% of the total energy consumption of buildings. Therefore, reducing the energy consumption of air conditioning system is of great significance to improve the energy efficiency of the whole society. The system consumes a lot of electric energy and causes serious environmental pollution because of its own structure and defects in air handling mode. Therefore, it is more urgent and practical to develop energy-saving and environmental protection air conditioning system. The heat and mass transfer characteristics and the overall performance of the HPLD-SR system were analyzed by combining theoretical and experimental methods. Firstly, the design of the HPLD-SR system was completed and a comprehensive experimental test platform was built. The HPLD-SR system consists of a solution dehumidification/regeneration cycle and a heat pump. The solution cycle is characterized by a design mode of dehumidification/regeneration self-circulation and inter-stage exchange cycle, which realizes the cascade utilization of the solution concentration; the heat pump cycle is characterized by the condensation heat of the solution connected in series. Secondly, the dehumidification process of low-temperature and low-concentration solution was studied experimentally and theoretically. The influence of inlet air and solution parameters on the heat and mass transfer performance of the process was analyzed through experimental study. The heat and mass transfer characteristics describing the process were summarized by using experimental data. The theoretical research includes: the NTU-Le model describing the direct contact process between air and solution is deduced and modified; a new method for calculating the coupled heat and mass transfer coefficients of dehumidification/regeneration process is proposed. Thirdly, the process of condensation heat using solution regeneration is experimentally and theoretically studied. The performance characteristics of the regeneration method of hot air/hot solution were mastered in the experiment, and the empirical correlations of heat and mass transfer in the process were summarized, which laid the foundation for the subsequent theoretical analysis. The concept of condensation heat regeneration utilization rate was proposed, and the utilization range of condensation heat in HPLD-SR system was pointed out. Three different regeneration modes of condensation heat utilization were compared in terms of mass driving force and treatment area, and the principle of optimum heat distribution of condensation heat regeneration was summarized. The performance of the system is analyzed by experiment and theoretical analysis, and the system is optimized by using the effective energy analysis method. The influence of the controllable parameters and environmental parameters on the performance of the system is analyzed by experiment. At the same time, the environmental adaptability of the unit is verified. The mathematical model of the whole system is established, which provides conditions for theoretical analysis and calculation. The matching relationship between solution concentration balance and energy change is revealed by combining theory with experiment. The energy saving characteristics of HPLD-SR unit are clarified by comparing with traditional air conditioning system and relevant national standards. The mathematical model of system effective energy analysis is used to optimize the process of air treatment and solution regeneration and the whole system form. The energy saving potential of the main equipment in the unit is also discussed.
【学位授予单位】：东南大学
【学位级别】：博士
【学位授予年份】：2016
【分类号】：TB657.2
，
本文编号：2180424
[Abstract]:With the diversification of building functions and the increasing density of people, the building energy consumption will account for about 30% of the total energy consumption of the national economy, while the energy consumption of air conditioning system will account for more than 50% of the total energy consumption of buildings. Therefore, reducing the energy consumption of air conditioning system is of great significance to improve the energy efficiency of the whole society. The system consumes a lot of electric energy and causes serious environmental pollution because of its own structure and defects in air handling mode. Therefore, it is more urgent and practical to develop energy-saving and environmental protection air conditioning system. The heat and mass transfer characteristics and the overall performance of the HPLD-SR system were analyzed by combining theoretical and experimental methods. Firstly, the design of the HPLD-SR system was completed and a comprehensive experimental test platform was built. The HPLD-SR system consists of a solution dehumidification/regeneration cycle and a heat pump. The solution cycle is characterized by a design mode of dehumidification/regeneration self-circulation and inter-stage exchange cycle, which realizes the cascade utilization of the solution concentration; the heat pump cycle is characterized by the condensation heat of the solution connected in series. Secondly, the dehumidification process of low-temperature and low-concentration solution was studied experimentally and theoretically. The influence of inlet air and solution parameters on the heat and mass transfer performance of the process was analyzed through experimental study. The heat and mass transfer characteristics describing the process were summarized by using experimental data. The theoretical research includes: the NTU-Le model describing the direct contact process between air and solution is deduced and modified; a new method for calculating the coupled heat and mass transfer coefficients of dehumidification/regeneration process is proposed. Thirdly, the process of condensation heat using solution regeneration is experimentally and theoretically studied. The performance characteristics of the regeneration method of hot air/hot solution were mastered in the experiment, and the empirical correlations of heat and mass transfer in the process were summarized, which laid the foundation for the subsequent theoretical analysis. The concept of condensation heat regeneration utilization rate was proposed, and the utilization range of condensation heat in HPLD-SR system was pointed out. Three different regeneration modes of condensation heat utilization were compared in terms of mass driving force and treatment area, and the principle of optimum heat distribution of condensation heat regeneration was summarized. The performance of the system is analyzed by experiment and theoretical analysis, and the system is optimized by using the effective energy analysis method. The influence of the controllable parameters and environmental parameters on the performance of the system is analyzed by experiment. At the same time, the environmental adaptability of the unit is verified. The mathematical model of the whole system is established, which provides conditions for theoretical analysis and calculation. The matching relationship between solution concentration balance and energy change is revealed by combining theory with experiment. The energy saving characteristics of HPLD-SR unit are clarified by comparing with traditional air conditioning system and relevant national standards. The mathematical model of system effective energy analysis is used to optimize the process of air treatment and solution regeneration and the whole system form. The energy saving potential of the main equipment in the unit is also discussed.
【学位授予单位】：东南大学
【学位级别】：博士
【学位授予年份】：2016
【分类号】：TB657.2
，
本文编号：2180424
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