【作者】 孙凯；

【导师】 张于峰；

【作者基本信息】 天津大学 ， 热能工程， 2008， 硕士

【摘要】 本课题系与丹麦技术大学的合作科研项目,针对当前大型工业空调系统的弊病进行研究,并开发一种新型的空调系统——转轮与热泵联合运行的空调系统,对其关键技术环节—高温热泵技术进行了重点研究。新设计的转轮热泵空调系统与己有的转轮与蒸汽压缩制冷结合的空调系统不同,其主要表现在:己有的空调系统中显热换热器与冷凝器释放的热量品位相当,约在50℃左右,这样的温度难以达到再生温度的要求,为此还需额外附加再生加热器用以提高温度要求。基于对现有再生能耗的分析,提出了直接利用热泵系统与除湿转轮相结合,在热泵蒸发端对室内送风进行降温的同时,利用热泵的冷凝端提高室外空气的温度,达到完全满足除湿转轮再生空气的温度和再生负荷的要求。为了达到此种效果,必须对传统的热泵进行技术改进才能够实现。建立了用于热泵系统仿真的部件模型和整机模型,便于在实验中找到更有效和简捷的提高高温热泵技术的方法。压缩机采用集中参数法,换热器采用分区集中参数法。整机模型算法是在压缩机、冷凝器、蒸发器、毛细管等部件和工况参数既定的情况下,计算系统的效能;并利用实验进行检验,模拟误差在10%以内,满足精度要求。在研究过程中设计并建立了热泵子系统的实验台。由于该实验的主要目的是为了提高室内侧出风温度,以达到满足除湿转轮再生空气的温度,所以在实验当中对适合实验工况要求的中高温热泵工质进行选取,对热泵系统中的节流装置(毛细管)进行改进,同时对系统的风量进行控制以及在不同的实验工况下进行对比。通过实验数据表明,利用上述拟定的方法,能较好的提高室内侧出风温度(最高温度达到79.09℃)达到了实验所预期的60℃以上的要求。更多还原

【Abstract】 The issue is about the project in cooperation with the Technical University of Denmark, undertaking a study into the current problems of the large-scale industrial air-conditioning systems As a result, a new type of air-conditioning system, called solid desiccant assisted heat pump hybrid and new air-conditioning system is finally developed. The most important part of the research is the high-temperature heat pump technology.There are some difference between the newly developed rotary wheel heat pump system and the traditional air conditioning system which combines the rotary wheel and the steam compressed air conditioning system. Mainly the difference is as follows. In the old air conditioning system, the heat given in the sensible heat exchangers are equivalent with that given in the condenser, all of which is about 50 degrees. The temperature is not high enough for the regeneration of the rotary wheel, so extra heaters are needed to raise the temperature. According to the analyze of the heat and energy consumption for regeneration, we can directly use the heat pump to produce heat and heat pump system combined with the rotary wheel desiccant As a result, the temperature of the outdoor air will be raised by the condenser of the heat pump, which can provide proper temperature for the regeneration of the rotary wheel, and the indoor air can also be cooled down by the evaporator. In order to reach the goal, some promotion must be made about the heat pump system.Some models about the components and the whole device of the heat pump are made in order to find more efficiency and simpler methods to promote the high-temperature heat pump system. To treat the compressor, we use focus parameter,while division focus parameter are used to deal with the heat exchangers. The algorithm about the device is to calculate the effectiveness of the system in the conditions of fixed parameter of the compressor, the condenser, the evaporator and the capillary. The result is compared with the result of the experiments. If the difference is below 10 percent, the parameters are considered correct.During the research, an experiment rig of the sub heat pump system is designed. Because the main goal of the experiment is to raise the temperature of the indoor ventilation to fit with the required temperature of the air for the rotary wheel desiccant, so we select proper media-temperature and high-temperature cold-producing medium, make some promotion about the capillary, and control the input air to make some comparison under different working conditions. After being analyzed, the parameters collected in the experiment shows that the research successfully raised the leaving air temp of the indoor side by about 60 degrees that is prospected and the highest temp is 79.09 degree.更多还原