单一冷源独立新风空调系统实验研究

发布时间：2018-02-09 15:11

本文关键词： 单一冷源独立新风冷量比空调系统节能　出处：《天津商业大学》2017年硕士论文　论文类型：学位论文

【摘要】：目前,空调已经逐渐进入人类生产生活的各个角落。空气调节系统给我们的生活提供了舒适的环境,而且是人们越来越依赖的环境。但是,空调系统的能耗也引起了各界人士的注意,特别是在当今能源危机的大时代下。建筑类型、空调系统本身的性能、使用的室内外环境等都影响着空调能源消耗。以上这些因素国内外诸多学者以及专家已做了相关的研究。本实验在指导老师的指导下,就空调系统的冷源上做研究,通过实验测出冷量的配比,并且在此冷量配比的工况下进行两个冷源的实验。单一冷源独立新风空调系统,是指本实验只用一个冷水机组作为空调系统冷源,冷源冷冻水依次通过串联的除湿机组和降温机组,室外新风通过自制除湿机组时,空气中的水蒸气成分在换热器表面结露,凝结水顺着换热器底部的小孔以及管道排出,得到的低温、较干燥的空气经风道传入实验室内。室内使用风机盘管,作为降温机组。室内原有空气和新风混合后,空气在风盘风机的作用下,不断经过风机盘管的换热器进行冷却降温,并且使得室内空气循环流动,室内各处空气的温湿度基本均匀一致。系统的除湿机组和降温机组的冷媒水串联在一起,冷媒水先经过除湿机组,除湿机组下部设有出水孔和排水管,凝结析出的水可以直接排出。出除湿机组后,冷媒水水温升高再进入室内风机盘管机组,最后再经回水管返回到冷源的冷媒水水箱,完成循环。冷冻水的温度升高后,就可以保证在室内的风机盘管机组的换热器表面不会产生结露,即是在干工况下运行,室内盘管处就不会有凝水析出,避免了盘管存湿垢以及微生物滋生等问题。并且从初投资上,不需要购置第二套冷源机组,以及独立的高温冷媒供回水管路,同时,节省了第二台冷源的机组的能耗。根据实验方案,绘制实验结构系统图,按照图纸搭设实验台,实验中准备两台冷媒机组,通过控制阀门的开启与关闭,切换单一冷源和双冷源模式,先做对照实验,之后依次改变冷媒水流量和新风风量,使用自制的电加热设备调控室内空气的温度,用加湿器调节室内空气的相对湿度。各组实验开始时均达到同一状态,分别计算各个实验工况下,系统的除湿量和耗冷量,分析对比实验结果,结果表明:当送入实验室的新风量为室内总风量的35%时,是最佳新风比。在此工况下,使用单一冷源比双冷源系统,能源消耗增加0.2%,两种系统能耗差异不大,但单一冷源空调系统节省了冷源设备,以及相关管路。在一些适当场所,推荐使用单一冷源串联除湿和降温机组的空调系统。
[Abstract]:At present, air conditioning has gradually entered every corner of human production and life. Air conditioning system provides comfortable environment for our life, and it is more and more dependent on environment. However, The energy consumption of air conditioning systems has also attracted the attention of people from all walks of life, especially in the great era of energy crisis. The types of buildings, the performance of air conditioning systems themselves, These factors have been studied by many scholars and experts at home and abroad. Under the guidance of the instructor, this experiment has done research on the cold source of air conditioning system. Through the experiment, the ratio of cooling quantity is measured, and the experiment of two cold sources is carried out under the condition of the ratio of cold quantity. The single cold source independent fresh air conditioning system means that only one chiller is used as the cold source of the air conditioning system in this experiment. The cold source chilled water passes in turn through the series dehumidifier group and the cooling unit. When the outdoor fresh air passes through the self-made dehumidifier group, the water vapor in the air condenses on the surface of the heat exchanger, and the condensate water is discharged along the holes and pipes at the bottom of the heat exchanger. The resulting low temperature, drier air was passed through the air duct into the laboratory. The fan coil unit was used as the cooling unit. After the original air and fresh air were mixed in the room, the air was under the action of the air disk fan. Continuous cooling and cooling through the heat exchanger of the fan coil unit, and making the indoor air circulate and flow, the temperature and humidity of the air around the room are basically uniform. The dehumidifier unit of the system and the cooling water of the cooling unit are in series together. Refrigerant water passes through the dehumidifier group first, and the lower part of the dehumidifier group is provided with outlet holes and drain pipes. The condensed and precipitated water can be discharged directly. After the dehumidifier group, the refrigerant water temperature rises and then enters the indoor fan coil unit. Finally, return to the coolant water tank of the cold source through the backwater pipe to complete the circulation. After the temperature of the frozen water is raised, it can be ensured that the surface of the heat exchanger of the indoor fan coil unit will not be exposed, that is, it will operate under dry working conditions. There will be no condensate in the room, avoiding problems such as wet deposit and microbial breeding. In addition, there is no need to purchase a second set of cold source units and separate high-temperature refrigerant for backwater pipes, in the meantime, According to the experimental scheme, draw the experimental structure system diagram, set up the experimental platform according to the drawing, prepare two refrigerant units in the experiment, and control the opening and closing of the valve. Switch between single cold source and double cold source mode, first do a controlled experiment, then change the water flow rate of refrigerant and fresh air volume in turn, and use a self-made electric heating device to control the temperature of indoor air. The relative humidity of indoor air is regulated by humidifier. Each group of experiments reaches the same state at the beginning of the experiment. The dehumidification amount and the cooling consumption of the system under each experimental condition are calculated separately, and the experimental results are analyzed and compared. The results show that the best fresh air ratio is when the fresh air volume sent into the laboratory is 35% of the total indoor air volume. Under this condition, the energy consumption of the two systems increases by 0.2% when the single cold source is used compared with the double cold source system, and there is no significant difference between the two systems in energy consumption. But the single cold source air conditioning system saves the cold source equipment and the related pipeline. In some suitable places, it is recommended to use the single cold source series dehumidification and cooling unit air conditioning system.
【学位授予单位】：天津商业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB657.2

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